Gas pressure regulator rdg 50 specifications. Repair kit for gas pressure regulators type rdg

garden equipment 15.06.2019
garden equipment

Specifications RDG-50N(V)

RDG-50N RDG-50V
1,2 1,2
1-60 30-600
Seat diameter, mm 35 (25) 35(25)
900 (450) 900 (450)
±10 ±10
0,3-3 3-30
1-70 0,03-0,7
D
entrance 50 50
exit 50 50
Construction length L, mm 365 365
length l 440 440
width B 550 550
height H 350 350

Weight, kg, no more

 80 80

* Provided with a set of replacement springs.

The device and principle of operation of RDG-50N (V)

The regulator actuator (see figure) with control valves and a shut-off valve is designed to automatically maintain the specified outlet pressure in all gas flow rates by changing the valve flow area, to turn off the gas supply in case of emergency increase and decrease in outlet pressure.

The actuating device has a housing 3, inside which a saddle is installed. The membrane actuator consists of a membrane 5, a rod connected to it, at the end of which a valve is fixed. The rod moves in the bushings of the guide column of the body.

Stabilizer 1 is designed to maintain a constant pressure at the inlet to the control regulator, i.e., to exclude the influence of inlet pressure fluctuations on the operation of the regulator as a whole. The stabilizer is made in the form of a direct-acting regulator and includes: a housing, a spring-loaded diaphragm assembly, and a working valve. The inlet pressure gas flows through the stabilizer 1 to the control regulator 7. From the control regulator (for the RDG-80N version) or from the stabilizer (for the RDG-80V version), the gas enters the submembrane cavity through the adjustable throttle 4, and through the impulse tube - into the above-membrane cavity actuator. Through the throttle, the submembrane cavity of the actuator is connected to the gas pipeline behind the regulator. The pressure in the submembrane cavity of the actuator during operation will always be greater than the outlet pressure. The supra-membrane cavity of the actuating device is under the influence of the outlet pressure.

The control regulator (for the RDG-80N version) or the stabilizer (for the RDG-80V version) maintains a constant pressure behind it, so the pressure in the sub-membrane cavity will also be constant (in the set mode).

Any deviations of the outlet pressure from the set one cause pressure changes in the supra-membrane cavity of the actuator, which leads to the valve moving to a new equilibrium state corresponding to the new values ​​of the inlet pressure and flow rate, while the outlet pressure is restored. In the absence of gas flow, the valve is closed, which is determined by the absence of a control pressure drop in the supra-membrane cavity of the actuator and the action of the inlet pressure. In the presence of gas consumption, a control differential is formed in the supra-membrane and sub-membrane cavities of the actuator, as a result of which the membrane 5 with the stem connected to it, at the end of which the valve is fixed, will move and open the passage of gas through the gap formed between the valve seal and the seat. With a decrease in gas flow, the valve, under the action of a control pressure drop in the cavities of the actuator, together with the membrane, will move in the opposite direction and reduce the gas passage, and in the absence of gas flow, the valve will close the seat. In the event of emergency increases and decreases in the outlet pressure, the membrane of the control mechanism 2 moves to the left or right, the shut-off valve stem comes out of contact with the stem 6 of the shut-off valve control mechanism, and under the action of the spring closes the gas inlet to the regulator.

Gas pressure regulator RDG:
1 - stabilizer; 2 - membrane of the control mechanism; 3 - body; 4 - adjustable throttle; 5 - membrane; 6 - stock; 7 - control knob

RDG-50N RDG-50V
Maximum inlet pressure, MPa 1,2 1,2
Outlet pressure setting limits, kPa 1-60 30-600
Seat diameter, mm 35 (25) 35(25)
Throughput at an inlet pressure of 0.1 MPa and an outlet pressure of 0.001 MPa for gas with a density of 0.72 kg/m³, m³/h 900 (450) 900 (450)
Uneven regulation, %, no more ±10 ±10
Limits of adjustment of pressure of operation of the automatic disconnecting device, kPa:
when output pressure drops 0,3-3 3-30
when output pressure rises 1-70 0,03-0,7
D u, connecting pipe, mm:
entrance 50 50
exit 50 50
Construction length L, mm 365 365
Overall dimensions, mm, not more than:
length l 440 440
width B 550 550
height H 350 350

Weight, kg, no more

Specifications RDG-50-N(V)

RDG-50-N(V)
Controlled environment natural gas according to GOST 5542-87
Maximum inlet pressure, MPa 0,1-1,2
Outlet pressure setting limits, MPa 0,001-0,06(0,06-0,6)
Gas throughput with ρ=0.73 kg/m³, m³/h:
R in = 0.1 MPa (app. N) and R in = 0.16 MPa (version B)		 1300
Working valve seat diameter, mm:
big 50
small 20
Uneven regulation, % ±10
Pressure setting limit of triggered automatic shutdown device, MPa:
when output pressure drops 0,0003-0,0030...0,01-0,03
when output pressure rises 0,003-0,070...0,07-0,7
Connecting dimensions, mm:
D at the inlet 50
D at the outlet 50
Compound flange according to GOST 12820
Overall dimensions, mm 435×480×490
Weight, kg 65

The device and principle of operation of RDG-50-N (V)

The actuator (see figure) with small 7 and large 8 control valves, shut-off valve 4 and noise suppressor 13 is designed by changing the flow sections of the small and large control valves to automatically maintain the specified outlet pressure in all gas flow modes, including zero, and turn off the gas supply in the event of an emergency increase or decrease in outlet pressure. The actuator consists of a cast body 3, inside which a large seat 5 is installed. The valve seat is replaceable. A membrane drive is attached to the bottom of the housing. The pusher 11 rests against the central seat of the membrane plate 12, and the rod 10 transmits the vertical movement of the membrane plate to the stem 19, at the end of which a small control valve 7 is rigidly fixed. The rod 10 moves in the bushings of the housing guide column. Between the protrusion and the small valve, a large control valve 8 sits freely on the stem, in which the seat of the small valve 7 is located. Both valves are spring-loaded.

Under the large saddle 5 there is a noise suppressor in the form of a glass with slotted holes.

Stabilizer 1 is designed (in the “H” version) to maintain a constant pressure at the inlet to the control regulator, i.e. to exclude the effect of fluctuations in the outlet pressure on the operation of the regulator as a whole. The stabilizer is made in the form of a direct-acting regulator and includes: a body, a membrane assembly, a head, a pusher, a valve with a spring, a seat, a sleeve and a spring for adjusting the stabilizer to a given pressure before entering the control regulator. The pressure on the pressure gauge after the stabilizer must be at least 0.2 MPa (to ensure a stable flow rate).

Stabilizer 1 (for version "B") maintains a constant pressure behind the regulator by maintaining a constant pressure in the submembrane cavity of the actuator. The stabilizer is made in the form of a direct action regulator. In the stabilizer, unlike the control regulator, the supra-membrane cavity is not connected to the supra-membrane cavity of the actuator, and a stiffer spring is installed to adjust the regulator. The adjusting cup adjusts the regulator to the specified outlet pressure.

The pressure regulator 20 generates a control pressure in the submembrane cavity of the actuator in order to reset the control valves of the control system. The control regulator includes the following parts and assemblies: housing, head, assembly, membranes; pusher, valve with spring, seat, cup and spring for adjusting the regulator to a given outlet pressure. With the help of the adjusting cup of the control regulator (for version "H"), the pressure regulator is adjusted to the specified outlet pressure.

Adjustable throttles 17, 18 from the submembrane cavity of the actuator and on the waste impulse tube are used to adjust the quiet (without fluctuations) operation of the regulator. Adjustable choke includes: body, slotted needle and stopper.

The pressure gauge is designed to control the pressure in front of the control regulator.

The shut-off valve control mechanism 2 is designed to continuously monitor the outlet pressure and issue a signal to actuate the shut-off valve in the actuator in case of emergency increase and decrease in the outlet pressure above the allowable set values. The control mechanism consists of a detachable housing, a diaphragm, a rod, a large and a small spring, which balance the effect of the output pressure pulse on the diaphragm.

Filter 9 is designed to clean the gas supplying the stabilizer from mechanical impurities

The regulator works as follows.

The input pressure gas flows through the filter to the stabilizer 1, then to the control regulator 20 (for version "H"). From the control regulator (for version "H") or the stabilizer (for version "B"), the gas flows through the adjustable throttle 18 into the submembrane cavity and through the adjustable throttle 17 into the submembrane cavity of the actuator. Through the throttle washer 21, the supra-membrane cavity of the actuator is connected by an impulse tube 14 to the gas pipeline downstream of the regulator. Due to the continuous flow of gas through the throttle 18, the pressure in front of it, and, consequently, the sub-membrane cavity of the actuator, during operation, will always be greater than the outlet pressure. The supra-membrane cavity of the actuating device is under the influence of the outlet pressure. The pressure regulator (for version “H”) or the stabilizer (for version “B”) maintains a constant pressure, so the pressure in the sub-membrane cavity will also be constant (in steady state). Any deviations of the outlet pressure from the set one cause pressure changes in the supra-membrane cavity of the actuator, which leads to the control valve moving to a new equilibrium state corresponding to the new values ​​of the inlet pressure and flow rate, while the outlet pressure is restored. In the absence of gas flow, the small 7 and large 8 control valves are closed, which is determined by the action of the springs 6 and the absence of a control pressure drop in the above-membrane and sub-membrane cavities of the actuator and the action of the outlet pressure. In the presence of a minimum gas consumption, a control pressure drop is formed in the supra-membrane and sub-membrane cavities of the actuator, as a result of which the membrane 12 will begin to move under the action of the resulting lifting force. Through the pusher 11 and the rod 10, the movement of the membrane is transmitted to the stem 19, at the end of which the small valve 7 is rigidly fixed, as a result of which the gas passes through the gap formed between the seal of the small valve and the small seat, which is directly installed in the large valve 8. In this case, the valve under the action of spring 6 and inlet pressure, it is pressed against the large seat, so the flow rate is determined by the flow area of ​​the small valve. With a further increase in gas flow under the action of a control pressure drop in the indicated cavities of the actuator, the membrane 12 will begin to move further and the stem with its protrusion will begin to open the large valve and increase the passage of gas through the additionally formed gap between the valve seal 8 and the large seat 5. With a decrease in gas flow, the large valve 8 under the action of a spring and receding under the action of a changed control pressure drop in the cavities of the actuating device of the stem 19 with protrusions will reduce the flow area of ​​the large valve and subsequently close the large seat 5. The regulator will begin to operate in low load modes.

With a further decrease in the gas flow, the small valve 7 under the action of the spring 6 and the changed control pressure drop in the cavities of the actuator, together with the membrane 12, will move further in the opposite direction and reduce the gas flow.

In the absence of gas flow, the small valve 7 will close the small seat. In the event of an emergency increase and decrease in the output pressure, the membrane of the control mechanism 2 moves to the left and right, the shut-off valve lever 4 comes out of contact with the stem 16, the shut-off valve under the action of the spring 15 will shut off the gas flow by the regulator.

1 - stabilizer; 2 - control mechanism; 3 - body of the actuator; 4 - shut-off valve; 5 - large saddle; 6 - springs of small and large control valves; 7, 8 - small and large control valve; 9 - filter; 10 - rod of the actuator; 11 - pusher; 12 - membrane of the actuator; 13 - noise suppressor; 14 - impulse tube of the outlet gas pipeline; 15 - cut-off valve spring; 16 - rod of the control mechanism; 17, 18 - control chokes; 19 - stock; 20 - control regulator; 21 - throttle washer

Classification.Gas pressure regulators are classified: by purpose, the nature of the regulatory action, the relationship between the input and output values, the method of influencing the control valve.

According to the nature of the regulatory action, regulators are divided into astatic and static (proportional). Schematic diagrams regulators are shown in the figure below.

Diagram of pressure regulators

a - astatic: 1 - rod; 2 - membrane; 3 - cargoes; 4 - submembrane cavity; 5 - gas outlet; 6 - valve; b - static: 1 - rod; 2 - spring; 3 - membrane; 4 - submembrane cavity; 5 - impulse tube; 6 - stuffing box; 7 - valve.

AT astatic regulator membrane has a piston shape, and its active area, which perceives gas pressure, practically does not change at any position of the control valve. Therefore, if the gas pressure balances the gravity of the membrane, stem and valve , then the membrane suspension corresponds to a state of astatic (indifferent) equilibrium. The gas pressure regulation process will proceed as follows. Let us assume that the gas flow through the regulator is equal to its inflow and the valveoccupies a certain position. If the gas flow increases, then the pressure will decrease.and the membrane device will lower, which will lead to an additional opening of the control valve. After the restoration of equality between inflow and flow occurs, the gas pressure will increase to a predetermined value. If the gas flow rate decreases and, accordingly, there is an increase in gas pressure, the control process will proceed in reverse direction. Adjust the regulator to the required gas pressure using special weights, moreover, with an increase in their mass, the outlet gas pressure increases.

Astatic controllers after perturbation lead adjustable pressure to the set value, regardless of the load and the position of the control valve. The equilibrium of the system is possible only at a given value of the controlled parameter, while the control valve can occupy any position. Astatic regulators are often replaced by proportional ones.

In static (proportional) regulators, in contrast to astatic ones, the submembrane cavity is separated from the collector by a stuffing box and connected to it by a pulse tube, that is, the feedback nodes are located outside the object. Instead of weights, a spring compression force acts on the membrane.

In an astatic regulator, the slightest change in the outlet gas pressure can lead to the movement of the control valve from one extreme position to another, and in a static regulator, the valve is completely moved only when the spring is compressed accordingly.

Both astatic and proportional regulators, when working with very narrow proportionality limits, have the properties of systems operating on the “open - closed” principle, that is, with a slight change in the gas parameter, the valve moves instantly. To eliminate this phenomenon, special throttles are installed in the fitting connecting the working cavity of the membrane device with a gas pipeline or candle. The installation of chokes allows you to reduce the speed of movement of the valves and achieve a more stable operation of the regulator.

According to the method of action on the control valve, regulators of direct and indirect action are distinguished. In regulators direct action the control valve is under the action of the control parameter directly or through dependent parameters and, when the value of the controlled parameter changes, it is actuated by a force that occurs in the sensing element of the regulator, sufficient to move the control valve without an external source of energy.

In regulators indirect action the sensing element acts on the control valve with an external source of energy ( compressed air, water or electricity).

When the value of the regulating parameter changes, the force that occurs in the sensing element of the regulator activates an auxiliary device that opens the access of energy from an external source to the mechanism that moves the control valve.

Direct acting pressure regulators are less sensitive than indirect acting pressure regulators. Relatively simple design and the high reliability of direct acting pressure regulators have made them wide application in the gas industry.

Throttle devices pressure regulators (figure below) - valves of various designs. In gas pressure regulators, single-seated and double-seated valves are used. Single-seated valves are subjected to a one-sided force equal to the product of the area of ​​the orifice of the seat and the pressure difference on both sides of the valve. The presence of forces on one side only complicates the regulation process and at the same time increases the effect of pressure changes upstream of the regulator on the outlet pressure. At the same time, these valves provide reliable shutoff of gas in the absence of its extraction, which has led to their widespread use in the designs of regulators used in hydraulic fracturing.

Throttle devices of gas pressure regulators


a - hard single-seated valve; b - soft single-seated valve; c - cylindrical valve with a window for the passage of gas; g - valve rigid two-seated continuous with guide feathers; d - soft double-seated valve

Double-seat valves do not provide tight closure. This is due to the uneven wear of the seats, the difficulty of grinding the shutter to two seats at the same time, and also to the fact that the size of the shutter and the seat change unevenly with temperature fluctuations.

The capacity of the regulator depends on the size of the valve and its stroke. Therefore, regulators are selected depending on the maximum possible gas consumption, as well as on the size of the valve and the magnitude of its stroke. Regulators installed in hydraulic fracturing should operate in the load range from 0 (“dead end”) to maximum.

The throughput of the regulator depends on the ratio of pressures before and after the regulator, the density of the gas and the final pressure. There are tables in the instructions and reference books bandwidth regulators at a pressure drop of 0.01 MPa. To determine the throughput of regulators with other parameters, it is necessary to recalculate.

membranes. With the help of membranes, the energy of gas pressure is converted into mechanical energy movement transmitted through a system of levers to the valve. The choice of membrane design depends on the purpose of the pressure regulators. In astatic regulators, the constancy of the working surface of the membrane is achieved by giving it a piston shape and using corrugation bend limiters.

Annular membranes have found the greatest use in regulator designs (Figure below). Their use facilitated the replacement of membranes during repair work and allowed to unify the main measuring devices various kinds regulators.

annular membrane


a - with one disk: 1 - disk; 2 - corrugation; b - with two disks

The movement of the membrane device up and down occurs due to the deformation of the flat corrugation formed by the support disk. If the membrane is in its lowest position, then the active area of ​​the membrane is its entire surface. If the membrane moves to the extreme upper position, then its active area is reduced to the area of ​​the disk. As the disk diameter decreases, the difference between the maximum and minimum active area will increase. Therefore, to lift the annular membranes, a gradual increase in pressure is necessary to compensate for the decrease in the active area of ​​the membrane. If the membrane is subjected to alternate pressure from both sides during operation, two disks are placed - above and below.

For low outlet pressure regulators, the one-way gas pressure on the diaphragm is balanced by springs or weights. For high or medium outlet pressure regulators, gas is supplied to both sides of the diaphragm, relieving it from one-sided forces.

Regulators of direct action are divided into piloted and unmanned. Pilot regulators(RSD, RDUK and RDV) have a control device in the form of a small regulator, which is called a pilot.

Unmanned regulators(RD, RDK and RDG) do not have a control device and differ from the pilot in size and throughput.

Direct acting gas pressure regulators. The RD-32M and RD-50M regulators are unmanned, direct-acting, differ in nominal bore 32 and 50 mm and provide gas supply up to 200 and 750 m 3 /h, respectively. The body of the RD-32M regulator (figure below) is attached to the gas pipeline with union nuts. The reduced gas is supplied through the impulse tube into the submembrane space of the regulator and exerts pressure on the elastic membrane. A spring exerts counterpressure on top of the membrane. If the gas flow rate increases, then its pressure behind the regulator will decrease, respectively, the gas pressure in the under-membrane space of the regulator will also decrease, the equilibrium of the membrane will be disturbed, and it will move down under the action of the spring. Due to the downward movement of the diaphragm, the linkage will move the piston away from the valve. The distance between the valve and the piston will increase, this will increase the gas flow and restore the final pressure. If the gas flow after the regulator decreases, the outlet pressure will increase and the regulation process will occur in the opposite direction. Replaceable valves allow you to change the capacity of the regulators. Regulators are adjusted to a given pressure mode using an adjustable spring, nut and adjusting screw.

Pressure regulator RD-32M

1 - membrane; 2 - adjustable spring; 3.5 - nuts; 4 - adjusting screw; 6 - cork; 7 - nipple; 8, 12 - valves; 9 - piston; 10 - impulse tube of final pressure; 11 - lever mechanism; 12 - safety valve

During low demand hours, the outlet gas pressure may rise and cause the regulator diaphragm to rupture. The membrane is protected from rupture by a special device, a safety valve built into the central part of the membrane. The valve provides gas discharge from the submembrane space to the atmosphere.

Combined regulators. The domestic industry produces several varieties of such regulators: RDNK-400, RDGD-20, RDSK-50, RGD-80. These regulators got such a name because the relief and cut-off (shut-off) valves are mounted in the regulator body. The figures below show the circuits of the combined regulators.

Regulator RDNK-400. Regulators of the RDNK type are produced in the modifications RDNK-400, RDNK-400M, RDNK-1000 and RDNK-U.

Gas pressure regulator RDNK-400

1 - relief valve; 2, 20 - nuts; 3 - tuning spring relief valve; 4 - working membrane; 5 - fitting; 6 - outlet pressure setting spring; 7 - adjusting screw; 8 - membrane chamber; 9, 16 - springs; 10 - working valve; 11, 13 - impulse tubes; 12 - nozzle; 14 - disconnecting device; 15 - glass; 17 - shut-off valve; 18 - filter; 19 - body; 21, 22 - lever mechanism

The device and principle of operation of the regulators is shown on the example of RDNK-400 (figure above). The combined low outlet pressure regulator consists of the pressure regulator itself and the automatic shut-off device. The regulator has a built-in impulse tube, which enters the submembrane cavity, and an impulse tube. The nozzle, located in the regulator body, is both the seat of the working and cut-off valves. The working valve is connected to the working membrane by means of a lever mechanism (stem and lever). The replaceable spring and adjusting screw are designed to adjust the outlet gas pressure.

The shut-off device has a diaphragm connected to the actuator, the latch of which holds the shut-off valve in the open position. The setting of the disconnecting device is carried out by replaceable springs located in the glass.

Gas medium or high pressure, supplied to the regulator, passes through the gap between the working valve and the seat, is reduced to low pressure and goes to consumers. The impulse from the outlet pressure through the pipeline comes from the outlet pipeline to the sub-membrane cavity of the regulator and to the shutdown device. When the outlet pressure rises or falls above set parameters the latch located in the shut-off device is disengaged by force on the membrane of the shut-off device, the valve closes the nozzle, and the gas flow stops. The regulator is put into operation manually after the elimination of the causes that caused the shutdown device to operate. Specifications of the regulator are given in the table below.

Technical characteristics of the RDNK-400 regulator

The manufacturer supplies the regulator set to an outlet pressure of 2 kPa, with the appropriate setting of the relief and shut-off valves. The outlet pressure is adjusted by turning the screw. Turning it clockwise increases the output pressure, counterclockwise decreases it. The relief valve is adjusted by turning the nut, which loosens or compresses the spring.

Regulator RDSK-50.The regulator with an output medium pressure contains independently operating pressure regulator, automatic shut-off device, relief valve, filter (figure below). Technical characteristics of the regulator are shown in the table below.

Gas pressure regulator RDSK-50


1 - shut-off valve; 2 - valve seat; 3 - body; 4, 20 - membrane; 5 - cover; 6 - nut; 7 - fitting; 8, 12, 21, 22, 25, 30 - springs; 9, 23, 24 - guides; 10 - glass; 11, 15, 26, 28 - rods; 13 - relief valve; 14 - unloading membrane; 16 - seat of the working valve; 17 - working valve; 18, 29 - impulse tubes; 19 - pusher; 27 - cork; 31 - regulator housing; 32 - mesh filter

The outlet pressure is adjusted by turning the guide. Turning it clockwise increases the output pressure, counterclockwise decreases it. The opening pressure of the relief valve is adjusted by turning the nut.

The shut-off device is adjusted by lowering the outlet pressure by compressing or releasing the spring by rotating the guide, and by increasing the outlet pressure by compressing or releasing the spring by rotating the guide.

The start of the regulator after the elimination of the malfunctions that caused the shutdown device to operate is carried out by unscrewing the plug, as a result of which the valve moves down until the stem moves to the left under the action of the spring and falls behind the protrusion of the valve stem, thus holding it in the open position. After that, the plug is screwed in until it stops.

Regulator Specifications RDSK-50

Maximum inlet pressure, MPa, no more

Outlet pressure setting limits, MPa

Throughput at an inlet pressure of 0.3 MPa, m 3 / h, no more

Outlet pressure fluctuation without adjustment of the regulator when the gas flow rate and inlet pressure fluctuations change by ±25%, MPa, not more than

The upper limit of the pressure setting for the start of the relief valve operation, MPa

The upper and lower limits of setting the pressure of the automatic shutdown device, MPa: with an increase in the output pressure more with a decrease in the output pressure less

Nominal passage, mm: inlet pipe outlet pipe

The manufacturer supplies a regulator set to an outlet pressure of 0.05 MPa, with a corresponding setting of the relief valve and shut-off device. When adjusting the outlet pressure of the regulator, as well as the operation of the relief valve and the shutdown device, use the replaceable springs included in the delivery. The regulator is installed on a horizontal section of the gas pipeline with a glass up.

Gas pressure regulator RDG-80(picture below). Combined regulators of the RDG series for regional hydraulic fracturing are produced for conditional passages of 50, 80, 100, 150 mm; they lack a number of shortcomings inherent in other regulators.

Regulator RDG-80

1 - pressure regulator; 2 - pressure stabilizer; 3- inlet tap; 4 - shut-off valve; 5 - working large valve; 6 - spring; 7 - working small valve; 8 - pressure gauge; 9 - impulse gas pipeline; 10 - rotary axis of the shut-off valve; 11 - rotary lever; 12 - shut-off valve control mechanism; 13 - adjustable throttle; 14 - noise suppressor

Each type of regulator is designed to reduce high or medium gas pressures to medium or low, automatically maintain the outlet pressure at a given level regardless of changes in flow rate and inlet pressure, as well as for automatic shutdown gas supply in case of emergency increase and decrease in outlet pressure in excess of the specified allowable values.

Application area regulators RDG- hydraulic fracturing and GRU reduction units of industrial, municipal and household facilities. Regulators of this type - indirect action. The regulator includes: actuator, stabilizer, control regulator (pilot).

Regulator RDG-80 provides stable and accurate regulation of gas pressure from minimum to maximum. This is achieved by the fact that the control valve of the actuator is made in the form of two spring-loaded valves of different diameters, ensuring stability of regulation over the entire range of flow rates, and in the control regulator (pilot) the operating valve is located on a two-arm lever, the opposite end of which is spring-loaded; the setting force on the lever is applied between the lever support and the spring. This ensures the tightness of the working valve and the accuracy of regulation in proportion to the ratio of the lever arms.

The actuator consists of a body, inside which a large seat is installed. The membrane drive includes a membrane of a rod rigidly connected to it, at the end of which a small valve is fixed; a large valve is freely located between the protrusion of the stem and the small valve, and the seat of the small valve is also fixed on the stem. Both valves are spring loaded. The rod moves in the bushings of the guide column of the body. Under the saddle there is a silencer, made in the form of a branch pipe with slotted holes.

The stabilizer is designed to maintain a constant pressure at the inlet to the control regulator, that is, to exclude the influence of inlet pressure fluctuations on the operation of the regulator as a whole.

The stabilizer is made in the form of a direct-acting regulator and includes a housing, a spring-loaded membrane assembly, a working valve, which is located on a two-arm lever, the opposite end of which is spring-loaded. With this design, the tightness of the control regulator valve and the stabilization of the outlet pressure are achieved.

The control regulator (pilot) changes the control pressure in the supra-membrane cavity of the actuator in order to rearrange the control valves of the actuator in case of mismatch of the control system.

The over-valve cavity of the impulse tube control regulator is connected through the throttle devices with the sub-membrane cavity of the actuator and with the discharge gas pipeline.

The submembrane cavity is connected by an impulse tube with the supramembrane cavity of the actuator. The control regulator diaphragm spring adjustment screw adjusts the control valve to the desired outlet pressure.

Adjustable throttles from the submembrane cavity of the actuator and on the discharge impulse tube are used to adjust the regulator for quiet operation. The adjustable throttle includes a body, a needle with a slot and a plug. The pressure gauge is used to control pressure after the stabilizer.

The control mechanism consists of a detachable body, a membrane, a rod of large and small springs that equalize the effect of the output pressure pulse on the membrane.

The shut-off valve control mechanism ensures continuous control of the outlet pressure and output of a signal for actuation of the shut-off valve in the actuating device in case of emergency increase and decrease of the outlet pressure in excess of the specified allowable values.

The bypass valve is designed to balance the pressure in the chambers of the inlet pipe before and after the shut-off valve when it is put into operation.

The regulator works as follows. To start the regulator into operation, it is necessary to open the bypass valve, the inlet gas pressure enters through the impulse tube into the over-valve space of the actuator. The gas pressure before and after the shut-off valve equalizes. Turning the lever opens the shut-off valve. The gas pressure through the shut-off valve seat enters the supra-valve space of the actuator and through the impulse gas pipeline - into the sub-valve space of the stabilizer. Under the action of a spring and gas pressure, the valves of the actuator are closed.

The stabilizer spring is set to the specified outlet gas pressure. The inlet gas pressure is reduced to a predetermined value, enters the supra-valve space of the stabilizer, into the sub-membrane space of the stabilizer and through the impulse tube into the sub-valve space of the pressure regulator (pilot). The compressive adjusting spring of the pilot acts on the membrane, the membrane goes down, through the plate it acts on the rod, which moves the rocker. The pilot valve opens. From the control regulator (pilot), gas through an adjustable throttle enters the submembrane cavity of the actuator. Through the throttle, the submembrane cavity of the actuator is connected to the cavity of the gas pipeline behind the regulator. The gas pressure in the submembrane cavity of the actuating device is greater than in the supramembrane one. The membrane with a rod rigidly connected to it, at the end of which a small valve is fixed, will begin to move and open the passage of gas through the gap formed between the control of the small valve and the small seat, which is directly installed in the large valve. In this case, the large valve is pressed against the large seat under the action of the spring and the inlet pressure, and therefore the gas flow is determined by the flow area of ​​the small valve.

Outlet gas pressure impulse lines(without chokes) enters the sub-membrane space of the pressure regulator (pilot), into the supra-membrane space of the actuator and to the membrane of the shut-off valve control mechanism.

With an increase in gas flow under the action of a control pressure drop in the cavities of the actuator, the membrane will begin to move further and the stem with its protrusion will begin to open the large valve and increase the passage of gas through the additionally formed gap between the seal of the large valve and the large seat.

With a decrease in gas flow, a large valve under the action of a spring and moving in the opposite direction under the influence of a changed control pressure drop in the cavities of the actuating device of the rod with protrusions will reduce the flow area of ​​the large valve and block the large seat; while the small valve remains open and the regulator will start to work in the mode of small loads. With a further decrease in gas flow, the small valve, under the action of a spring and a control pressure drop in the cavities of the actuator, together with the membrane, will move further in the opposite direction and reduce the gas passage, and in the absence of gas flow, the small valve will close the seat.

In the event of an emergency increase or decrease in the outlet pressure, the membrane of the control mechanism moves to the left or right, the stem of the cut-off valve comes out of contact with the stem of the control mechanism, and the valve closes the gas inlet to the regulator under the action of a spring.

Gas pressure regulator designed by Kazantsev (RDUK). The domestic industry produces these regulators with nominal bores of 50, 100 and 200 mm. Characteristics of RDUK are shown in the table below.

Characteristics of RDUK regulators

Throughput at a pressure drop of 10 OOO Pa and a density of 1 kg / m, m 3 / h

Diameter, mm

Pressure, MPa

conditional

maximum input

final

Regulator RDUK-2

a - the regulator in the context; b - regulator pilot; c - regulator piping scheme; 1, 3, 12, 13, 14 - impulse tubes; 2 - control regulator (pilot); 3 - body; 5 - valve; 6 - column; 7 - valve stem; 8 - membrane; 9 - support; 10 - throttle; 11 - fitting; 15 - fitting with a pusher; 16, 23 - springs; 17 - cork; 18 - pilot valve seat; 19 - nut; 20 - housing cover; 21 - pilot's body; 22 - threaded glass; 24 - disk

The RDUK-2 regulator (see figure above) consists of the following elements: a control valve with a membrane drive (actuator); control regulator (pilot); chokes and connecting pipes. The initial pressure gas passes through a filter before entering the control regulator, which improves the working conditions of the pilot.

The pressure regulator membrane is clamped between the body and the cover of the membrane box, and in the center between the flat and cup-shaped disc. The bowl-shaped disc rests against the groove of the lid, which ensures that the membrane is centered before it is clamped.

A pusher rests in the middle of the membrane plate seat, and a rod presses on it, which moves freely in the column . The valve spool is freely hung on the upper end of the stem. Tight closure of the valve seat is ensured by the mass of the spool and the gas pressure on it.

The gas leaving the pilot enters through the impulse tube under the regulator membrane and is partially discharged through the tube into the outlet gas pipeline. To limit this discharge, a throttle with a diameter of 2 mm is installed at the junction of the tube with the gas pipeline, due to which the required gas pressure under the regulator membrane is obtained with a slight gas flow through the pilot. The impulse tube connects the supra-membrane cavity of the regulator with the outlet gas pipeline. The supra-membrane cavity of the pilot, separated from its outlet fitting, also communicates with the outlet gas pipeline through the impulse tube. If the gas pressure on both sides of the regulator diaphragm is equal, then the regulator valve is closed. The valve can only be opened if the gas pressure below the diaphragm is sufficient to overcome the gas pressure on the valve from above and overcome the gravity of the diaphragm suspension.

The regulator works as follows. Initial pressure gas from the over-valve chamber of the regulator enters the pilot. After passing the pilot valve, the gas moves through the impulse tube, passes through the throttle and enters the gas pipeline after the control valve.

The pilot valve, throttle and impulse tubes are throttle-type amplifying devices.

The final pressure impulse perceived by the pilot is amplified by the throttle device, transformed into command pressure and transmitted through the tube to the submembrane space of the actuator, moving the control valve.

With a decrease in gas flow, the pressure after the regulator begins to increase. This is transmitted through the impulse tube to the pilot diaphragm, which moves down to close the pilot valve. In this case, the gas from the high side of the impulse tube cannot pass through the pilot. Therefore, its pressure under the regulator membrane gradually decreases. When the pressure under the membrane is less than the gravity of the plate and the pressure exerted by the regulator valve, as well as the gas pressure on the valve from above, the membrane will go down, displacing gas from under the membrane cavity through the impulse tube to the vent. The valve gradually begins to close, reducing the opening for the passage of gas. The pressure after the regulator will drop to the set value.

With an increase in gas flow, the pressure after the regulator decreases. The pressure is transmitted through the impulse tube to the diaphragm of the pilot. The pilot diaphragm moves up under the action of the spring, opening the pilot valve. The gas from the high side flows through the impulse tube to the pilot valve and then through the impulse tube goes under the regulator diaphragm. Part of the gas goes to the discharge through the impulse tube, and part - under the membrane. The gas pressure under the regulator membrane increases and, overcoming the mass of the membrane suspension and the gas pressure on the valve, moves the membrane upward. The regulator valve then opens, enlarging the opening for the passage of gas. The gas pressure after the regulator rises to a predetermined value.

When the gas pressure increases in front of the regulator, it reacts in the same way as in the first case considered. When the gas pressure drops in front of the regulator, it works in the same way as in the second case.

  1. Throttle overmembrane RDG
  2. Throttle submembrane RDG
  3. Shut-off valve RDG
  4. RDG pilot valve
  5. Valve working RDG
  6. Stabilizer valve RDG
  7. Sealing ring RDG
  8. Membrane of the RDG control mechanism
  9. RDG Pilot Membrane
  10. Membrane working RDG
  11. Membrane stabilizer RDG
  12. Shut-off valve spring RDG
  13. RDG pilot valve spring
  14. Spring control mechanism large RDG
  15. Pilot spring RDG
  16. RDG stabilizer spring
  17. Spring control mechanism small RDG
  18. RDG Pilot's Saddle
  19. Regulator seat RDG
  20. Shut-off valve seal RDG
  21. RDG Regulator Filter
  22. Valve stem working RDG
  23. The rod of the control mechanism RDG
  24. Pilot RDG
  25. RDG stabilizer
Above, we have listed the main parts that can fail during the operation of the regulator. At present, in a crisis, it is often easier to repair a working regulator than to buy a new one. Of course, this is not always cost-effective, but often this is a real way out, which is economical in terms of money, but rather labor-intensive. It should immediately be noted that repair of the RDG-50 regulator should only be carried out by specially trained personnel authorized to this species works! Savings in this case can lead to sad consequences, ranging from a serious breakdown of the regulator, to accidents with human casualties.
RDG-50N without much effort can be found in many organizations involved in the supply gas equipment. But it should be noted that not everyone understands the intricacies of the operation of the gearbox and the differences in the main components. If you decide repair kit RDG-50N order, then first of all it is necessary to clarify the manufacturer of this product and preferably the year of its production. The fact is that in appearance it can be said that the regulators of different manufacturers practically do not differ, but the components can have significant differences. With regard to RTI, for example, membrane working RDG-50 everyone has the same. The only difference between them is the material.
Some manufacturers make membranes from membrane web, and some make them cast. The same goes for pilot membrane RDG-50 and stabilizer membrane RDG-50. But with the membranes of the pilot, not everything is so simple. There are several pilot designs. The round membrane of the pilot RDG-50 and the square membrane of the pilot differ not only in shape, but also in size. It is worth paying attention to the throttles.
Throttle RDG-50 may have different design. There was a case when the customer provided the name of the plant, but did not specify the year of production. When spare parts for RDG-50 were put it turned out that the chokes are not suitable. They turned out to have experimental regulators, parts for which no one had made for a long time. Saddle RDG-50 Rarely anyone differs, but still there are different. When ordering a saddle, as well as valve RDG-50, it is necessary to specify the diameter.
An important aspect when choosing spare parts is the material from which they are
are made and the production process itself also leaves its mark on the quality of parts. For example, if valve seal RDG-50 if it is not pressed with high quality, then such a valve will not work for a long time and will have to be repaired again.
Manufacturers are constantly working on the design of their regulators. This is due to the desire to reduce costs, as well as improve the quality and accuracy of work. Technicians develop new designs and this leads to changes in the internal parts of the regulators.
Regulators RDG-50, RDG-80 and RDG-150 have a similar design and the difference between the repair kits is the size of the parts. For example membrane working RDG-150 significantly more than membrane working RDG-80. The same is true with valves. Due to the difference in passage diameters and, accordingly, the throughput valve working RDG-150 more than valve working RDG-80, and that, in turn, is larger than the working valve RDG-50. Such components as the pilot and stabilizer from one manufacturer do not differ for regulators with different diameters. High regulators do not have a stabilizer in their design, so the cost of a repair kit will be lower. At repair kit RDG-150 price the highest among the three modifications, repair kit RDG-80 price intermediate and, accordingly, the price of the repair kit for the RDG-50 is the lowest.

We provide an opportunity repair kit RDG buy with delivery in Serpukhov, Odintsovo, Krasnogorsk, Khimki, Balashikha, Domodedovo, Lyubertsy, Podolsk, Chekhov, Stupino, Ramenskoye, Korolev, Pushkino, Noginsk, Tambov, Almaty, Atyrau, Aktau, Moscow, Novosibirsk, Nizhny Novgorod, Omsk, Tomsk, Yaroslavl, Petrozavodsk, Kazan, Aktobe, Karaganda, Ulan-Ude, Vladivostok, Khabarovsk, Penza, Kaluga, Volgograd, Chelyabinsk, Yekaterinburg, Ivanovo, Kstovo, Cheboksary, Ryazan, Dzerzhinsk, Rostov-on-Don, Perm, St. Petersburg, Kursk, Tula, Tver, Samara, Voronezh, Naberezhnye Chelny, Tyumen, Gatchina, Vladimir, Veliky Novgorod, Krasnoyarsk, Volzhsky, Belgorod, Rybinsk, Barnaul, Smolensk, Samara, Shchekino, Kemerovo, Orenburg, Surgut, Khasavyurt, Makhachkala, Grozny, Kaspiysk, Ufa, Miass, Krasnodar, Stavropol, Togliatti, Stary Oskol, Sterlitamak, Ishimbay, Rudny, Bryansk, Kostanay, Uralsk Sochi, Novokuznetsk, Astana, Amursk, Angarsk, Norilsk, Nizhnekamsk, Elista, Biysk, Murmansk, Vladikavkaz, Khanty-Mansiysk, Nalchik, Orel, Kalining Rada, Yoshkar-Ola. To do this, you need to contact us in any way convenient for you.

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