Regulator pressure gas RDUK it is used in various hydraulic fracturing and installations as the main device for lowering the working gas pressure and maintaining it at a given level, regardless of inlet pressure fluctuations and its flow rate. Kazantsev's universal gas pressure regulator, as the abbreviation of this device stands for, is equipped with gas supply systems for residential buildings and communal facilities, industrial and agricultural complexes.

Advantages of the RDUK regulator

Regulator pressure gas RDUK It has the following list of advantages, for which it is valued by its customers:

• Possibility of settings of values ​​of output pressure in a wide range;
• Exceptional throughput;
• Insignificant weight and dimensions, simplifying the task of installing RDUK in gas distribution points, cabinet and other gas distribution installations;
• The possibility of reconfiguring the regulator without dismantling it and stopping the gas supply to consumers;
• The climatic version of the device allows its operation in the temperature range environment from –45° С to +40° С.

The device and principle of operation of the RDUK regulator

Device RDUK2 has the following features. The pressure regulator is formed by two nodes - a regulating node (actuator) and a control node (command control, the so-called "pilot"). The type of pilot is selected based on the required outlet pressure that the regulator must provide. According to this principle, models with a pilot are distinguished low pressure KH2 (0.005–0.6 kgf/cm2) and high pressure KV2 (0.6–6 kgf/cm2).

The operation of the device is carried out due to the energy of the working environment and is carried out as follows. The reduction of gas pressure in the RDUK regulator occurs as a result of the movement of the equipped rubber seal poppet plug in relation to the valve seat. This movement is performed under the action of the difference between the inlet pressure on the plate and the outlet pressure acting from below.

The high-pressure gas that has passed through the filter is fed to the small valve of the pilot assembly and after it to the submembrane space of the control valve. Excess gas from under the membrane of the control valve is discharged back into the gas pipeline by means of a relief throttle.

The membranes of the pilot and the actuator are pulsed with output pressure, which is always lower than the input. Depending on the gas flow rate and the inlet pressure value, the pressure under the diaphragm is constantly monitored and adjusted automatically by means of a small pilot valve. When the pressure at the outlet of the RDUK changes relative to the set value in the submembrane space, the pressure will also change, which will lead to the movement of the main valve to a new equilibrium position and the return of the outlet pressure to the required level.

How to buy a gas pressure regulator RDUK

Before you buy a pressure regulator RDUK2, it is worth choosing the optimal modification of the device based on the parameters of the outlet pressure, the diameter of the seat and the nominal bore (Dn) required by the customer. For example, the RDUK regulator with the DN 50 version has a seat of 35 mm, DN 100 - 50 and 70 mm (low and high pressure, respectively), DN 200 - a seat of 105 and 140 mm (low and high pressure, respectively). The larger the seat size, the greater the throughput of the Kazantsev gas pressure regulator modification.

To clarify the availability of the modification of the RDUK regulator you are interested in, its current cost or other information of interest about the products presented on our website, you can contact the managers of the PKF SpetsKomplektPribor company. An application for the supply of the number of regulators you need can be left by any convenient way- by phone, skype or e-mail.

Type: universal pressure regulator.

The RDUK-2-50 regulator is designed to reduce gas pressure and automatically maintain a predetermined outlet pressure and installation in gas control points (GRP), gas control units (GRU).

The regulator provides a reduction in the inlet gas pressure and automatic maintenance of the set pressure at the outlet, regardless of changes in gas flow and inlet pressure.

The RDUK-2-50 gas regulator is used in gas supply systems for industrial, agricultural and municipal facilities.

Main technical data of the RDUK-2-50 regulator

Type: universal gas pressure regulator.

Climatic version: U2 GOST 15150-69.

Ambient temperature: from minus 45 to plus 40 0 ​​С.

Weight: 15 kg.

The device and principle of operation of the regulator RDUK-2-50

dimensions gas pressure regulator RDUK-2-50

The gas pressure regulator RDUK-2-50 consists of two main units - a control valve 5 and a pilot 20. A membrane actuator is attached to the lower part of the housing. The pusher 6 rests against the central nest of the plate, and the valve stem 7, which transmits the vertical movement of the membrane plate 3 to the regulator valve, rests against it. The stem moves in the guide column of the body 4, a valve with a rubber seal 8 sits freely on the upper end of the stem. The body is closed with a lid from above.

The KN-2 or KV-2 pilot in the pressure regulator piping circuit plays the role of a command device. The pilot consists of a body 11, a cover 12 of the membrane 15 sandwiched between them, a valve 21, a tuning spring 14 and an adjusting cup 13.

The inlet pressure gas enters the pilot from the top of the housing. After throttling in the pilot, gas through pipe 17 enters the submembrane space of the control valve through a calibrated hole into damping throttle 1. Excess gas from the submembrane space is constantly discharged into the gas pipeline after the regulator through pipe 18 through a throttle installed on the gas pipeline. Appropriate selection of the diameters of the throttles 1 and the throttle on the gas pipeline in the presence of a continuous gas flow through the tubes 17 and 18 allows you to constantly maintain a pressure slightly higher than the outlet pressure in the submembrane space of the control valve. This pressure difference on both sides of the membrane 3 forms its lifting force, which is balanced in any steady mode of operation of the regulator by the weight of the moving parts and the action of the inlet pressure on the valve 8.

The pilot spring 14, which determines the value of the outlet gas pressure, is compressed by screwing in the adjusting cup 13. The greater the outlet pressure should be, the stronger the spring should be compressed. In the idle state of the regulator, the spring must be loosened.

With an increase in gas extraction from the gas pipeline, its pressure after the regulator and under the membrane of the pilot 15 and the control valve will decrease. The pilot membrane under the action of the spring 14 will lower and through the pusher 10 will press on the pilot valve 21, compressing the spring 9 located above it. The pilot seat will open more, the flow of gas into the under-membrane space of the control valve and its pressure from below on the membrane 3 will increase. The membrane, rising, will increase valve lift and gas flow through the regulator.

With a decrease in gas extraction from the gas pipeline, its pressure after the regulator and under the membrane of the pilot 15 and the control valve will increase. The pilot diaphragm will rise and block the flow of gas through the pilot valve into the submembrane space of the control valve. The gas pressure under membrane 3 will decrease as a result of its discharge through tube 18, and the membrane will lower under the action of increasing gas pressure above it, and the control valve will reduce the gas supply through the regulator.

The pressure difference on both sides of the diaphragm creates a lifting force of the diaphragm, which, in any steady state operation of the control regulator, is balanced by the weight of the moving parts and the gas inlet pressure to the valve.

When the gas pressure at the outlet decreases, the pressure in the space above the membrane will also increase, while in the space below the membrane it will not change. As a result, the membrane rises and slightly opens the valve.

When the outlet gas pressure increases, the pressure in the space above the membrane will also increase, while in the space below the membrane it will not change. As a result, the membrane will lower and close the valve. Thus, for any deviation of the outlet pressure from the set one, a change in pressure in the space above the membrane will cause the valve to move to a new equilibrium position, at which the outlet pressure will be restored.

Indication of safety measures when working with the pressure regulator RDUK-2-50

The RDUK-2-50 regulator must be installed on gas pipelines with pressures corresponding to those specified in the technical specifications.

Installation and switching on of the pressure regulator RDUK-2-50-2 must be carried out by a specialized construction and installation and operating organization in accordance with approved project, specifications for the production of construction and installation works, "safety rules in the gas industry."

The elimination of defects during the revision of regulators should be carried out without the presence of pressure.

During testing, the increase and decrease in pressure should be carried out smoothly.

Preparing the pressure regulator RDUK-2-50 for operation

Before starting up the pressure regulator, the General requirements training and safety precautions provided for in the instructions for the start-up of a gas control unit or gas control unit.

Placement and installation of the RDUK-2-50 regulator

The pressure regulator RDUK-2-50-2 is mounted on a horizontal section.

The connection of the impulse pipeline 19 and tubes 16 and 18 from the membrane chamber to the main gas pipeline can be carried out according to various options:

The impulse tube 19 is connected to the middle of the straight section of the gas pipeline after the regulator with a length of ≈10 of its diameters. total length tubes should not exceed 6 m. tubes 16 and 18 are connected to the gas pipeline after the regulator in a section ≈100 mm long.

The impulse tube 19 is connected to the middle part of the straight section of the hydraulic fracturing bypass, tubes 16 and 18 are connected to the gas pipeline after the regulator in a section ≈100 mm long.

Tubes 19, 16 and 18 are connected to a special branch pipe, which is welded to the gas pipeline after the regulator at a distance of at least 5 of its diameters from the nearest turn.

Before starting, the adjusting screw of the control regulator (pilot) must be turned out until the spring is completely weakened.

For a low pressure regulator, it is necessary to check the setting of the replacement spring for the desired adjustable output pressure range.

Operating procedure.

With the pilot spring completely relaxed, the regulator is started by gradually screwing in the pilot adjusting cup.

The required outlet gas pressure is set on the manometer.

For stable operation of the regulator during start-up, it is recommended to ensure a minimum gas flow after it to the purge plug.

To create a flow through the regulator, it is desirable to use not a candle closest to the regulator, but a far one (if there is more than one candle). In this case, the regulator is configured for a heavier mode of operation.

After the candle, there should not be a section of the gas pipeline closed during commissioning and start-up. In this case, it is a gas accumulator, which adversely affects the conditions for adjusting the regulator and can lead to fluctuations in gas pressure during adjustment.

Maintenance of the RDUK-2-50 regulator

Regulator RDUK-2-50 is subject to inspection of the technical condition and current repairs according to the approved schedule in accordance with the requirements of PB-12-529-03.

Inspection of the technical condition is carried out as follows:

To inspect the control valve RDUK-2-50-2, it is necessary to remove the top cover, the valve with the stem and clean them. The valve seat and guide bushings should be thoroughly wiped. The sealing lip of the seat should be carefully inspected. In the presence of nicks and deep scratches seat should be replaced. The valve stem must move freely in the column. To inspect the membrane, remove the bottom cover. The membrane must be wiped.

Typical malfunctions of gas pressure regulators RDUK-2-50 and methods for their elimination

Violation of the operating mode of the RDUK-2-50-2 regulator during operation most often occurs when the main valve stem is stuck, as well as when the throttles on the regulator piping are clogged.

The pilot spring is fully relaxed, but the outlet pressure rises. The reason is the leakage of the main valve. The remedy is to replace the valve.

Outlet pressure drops to zero. The reason is the rupture of the membrane. Replace membrane.

The outlet pressure fluctuates greatly at low gas flow rates, regardless of the set pressure. It is eliminated by installing a throttle with a diameter of 3, 4 or 6 mm on the branch pipe 16 to the supra-membrane cavity of the control valve, respectively, for regulators DN 50, 100, 200 mm. If elimination of vibrations is not achieved by installing a throttle on the tube, then reduce the inlet pressure, and if necessary, replace the seat and valve with smaller sizes.

Specifications RDUK

Notes. 1. Regulators RDUK2N(V)-50 are currently not produced. 2. First digit after letter designation type of regulator - diameter of the connecting pipe D y, mm, the second is the diameter of the valve seat, mm.

The maximum capacity of RDUK2 regulators is shown in fig. 1 where R 1 , R 2 - inlet and outlet pressure, respectively, kg/cm².

Device and principle of operation of RDUK2N(V)-50

In the RDUK2N(V)-50 pressure regulator circuit (see Figures 1, 2), the KN2 control regulator is the command device, and the control valve is the actuator. The work of the pressure regulator is carried out due to the energy of the passing working medium.

Inlet pressure gas, in addition to the main valve, flows through the filter to the small valve of the control regulator and after it through the connecting tube through the damping throttle - under the control valve membrane. The gas is discharged into the gas pipeline behind the pressure regulator through a relief throttle.

The outlet gas pressure is supplied to the membranes of the control valve and the control regulator through the connecting pipes. Due to the continuous flow of gas through the bleed throttle, the pressure ahead of it, and therefore below the diaphragm of the control valve, is always greater than the outlet pressure.

The pressure difference on both sides of the diaphragm of the control valve forms the lifting force of the diaphragm, which, in any steady state of operation of the regulator, is balanced by the weight of the moving parts and the effect of the inlet pressure on the main valve.

The overpressure under the diaphragm of the control valve is automatically controlled by the small control regulator valve, depending on the gas consumption and inlet pressure upstream of the regulator.

The force of the outlet pressure on the membrane of the control regulator is constantly compared with the force of the lower spring set during the adjustment; any slight deviation in outlet pressure causes movement of the diaphragm and control regulator valve. This changes the flow rate of gas passing through the small valve, and consequently, the pressure under the diaphragm of the control valve.

Thus, for any deviation of the outlet pressure from the set pressure change under the large diaphragm causes the main valve to move to a new equilibrium position, at which the outlet pressure is restored. For example, if the outlet pressure rises as the gas consumption decreases, the diaphragm and the control regulator valve will drop slightly. In this case, the gas flow through the small valve will decrease, which will cause a decrease in pressure under the diaphragm of the control valve. The main valve under the action of the inlet pressure will begin to close until its flow area corresponds to the new gas consumption and the outlet pressure is restored.

In operation, the control regulator diaphragm and valve travel required for full main valve travel is very small, and the change in both spring forces at this slow stroke, and the effect of varying inlet pressure on the small valve, is a minor fraction of the effect of output pressure on the control regulator diaphragm. This means that the regulator, with changes in gas consumption and inlet pressure, maintains the outlet pressure due to a slight deviation from the set one. In practice, these deviations are approximately 1-5% of the nominal value.

Gas pressure regulator RDUK designed to reduce gas pressure and automatically maintain the outlet pressure within the specified limits, regardless of changes in the inlet pressure and gas flow. The regulator is applied in systems of gas supply of industrial, agricultural and household objects.

DN 50 are manufactured with a 35 mm seat, DN 100 with a 50, 70 mm seat, DN 200 with a 105, 140 mm seat. The diameter of the seat affects the capacity of the regulator, the larger the seat, the greater the capacity of the regulator.

On the basis of RDUK gas pressure regulators, we manufacture gas control points and gas control units of cabinet, block type or on a frame.

Produced RDUK models

RDUK is manufactured in the following modifications:

RDUK-50N(V) Du-50 with low or high outlet pressure and seat diameter 35 mm - RDUK-50N(V)/35;

RDUK-100N(V) Du-100 with low or high outlet pressure and seat diameter 50, 70 mm - RDUK-100N(V)/50(70);

RDUK-200N(V) Du-200 with low or high outlet pressure and seat diameter 105, 140 mm - RDUK-200N(V)/105(140).

Gas pressure regulators RDUK-200 are available in four versions:

With low outlet pressure and seat diameter 105 mm - RDUK 200 MN/105;
- with low outlet pressure and seat diameter 140 mm - RDUK 200 MN/140;
- with high outlet pressure and seat diameter 105 mm - RDUK 200 MV/105;
- with high outlet pressure and seat diameter 140 mm - RDUK 200 MV/140.

Throughput of RDUK:

- RDUK 50 6500 m3/h

- RDUK 100 12000/24500 m3/h

- RDUK 200 47000/70000 m3/h

Climatic version corresponds to UZ GOST 15150 (from -45o C to +40o C).

The gas pressure regulator RDUK 200 complies with the requirements of GOST 11881, GOST 12820 and a set of documentation according to specification RDUK 200M.00.00.00.

Technical and performance characteristics regulators RDUK-50/100/200

Gas regulator RDUK. Dimensions and specifications:

The RDUK pressure regulator stands for Kazantsev's universal pressure regulator.

This type of pressure regulator is installed in order to carry out pressure reduction natural gas. And also to carry out at the automatic level the retention of the outlet pressure within strictly specified limits. With all this, fluctuations in either the inlet pressure level or the amount of gas flow should not have any effect on the level of this maintenance.

RDUK gas pressure regulators are used in a wide variety of applications where gas supply may be required. Such objects can also be industrial, such as factories, and other large industrial enterprises, or agricultural, as well as directly public utilities and facilities.

All three models combined general principle work, however, they also have specific differences that should be taken into account when choosing a regulator, based on the tasks that need to be solved with the help of its installation.

Basic distinctive feature each of the RDUK pressure regulator models has a seat size. RDUK 2 50 is available with a seat size of 35 mm. In turn, RDUK 2 100 is available with a saddle size in two variations - 50 and 70 mm. And RDUK 2 200 has a saddle of 105 or 140 mm.

Seat size is an extremely important specification for selecting the correct type and type of gas pressure regulator. Because exactly how the size of the saddle, its diameter has a huge impact on the transmission capacity of the regulator. The smaller the saddle, the lower this throughput. Respectively, larger size will provide such a regulator with greater throughput.