Membrane device for valve kpz 100n. Safety shut-off valves KPZ

Contents of delivery. The delivery set of the safety shut-off valve KPZ includes:

Designed to automatically stop the supply of non-aggressive hydrocarbon gases to consumers when the controlled pressure rises and falls above the specified limits. Manufactured with nominal bore D at 50 and 100 mm low, medium or high controlled pressure.

Controlled environment - natural gas according to GOST 5542-87.

Connection - flange according to GOST 12820-80.

Specifications KPZ-100

The device and principle of operation of the KPZ-100

The valve has a cast iron flanged body 1 (see figure). Inside the body there is a seat, which is closed by a valve 2 with a rubber seal. Valve 2 is fixed on axis 3, which is located in housing 1. Springs 4, 5 are installed on axis 3, one end of which rests against housing 1, the other against valve 2. At the end of axis 3, which goes out, levers 6 are rigidly fixed, which rests against the lever 16. On the body 1 there is a control mechanism 7, which has a membrane 8, a rod 9 and a tip 15 rigidly fixed on the rod 9. The tip 15 engages with the stop 12 of the lever 16 and prevents it from turning. The membrane is balanced by controlled pressure and springs 10, 11, the forces of which are regulated by bushings 13, 14. Controlled pressure is supplied to the submembrane cavity of the control mechanism 7, causing the tip 15 to be in the middle position. With an increase or decrease in pressure in the submembrane cavity beyond the setting limits, the tip 15 moves, which releases the interconnected levers 16, 6 and allows the axis 3 to turn. The force from the action of springs 4, 5 is transferred to valve 2, and valve 2 closes the gas passage. Bringing the valve 2 into working condition after operation is done manually by turning the levers 6, 16 until they are fixed with the tip 15, and the valve 2 is held in the open position.

The valve KPZ-50N is designed to automatically stop the supply of natural gas when the controlled gas pressure rises or falls from the specified limits. DN50

The safety shut-off valve is designed to automatically stop the supply of natural gas GOST 5542-87 to the consumer when the controlled gas pressure rises or falls from the specified limits.
Valves are manufactured with nominal bores DN25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 450, 500, 600
Type of climatic version UHL4 GOST 15150-69
The valve response time is not more than 1 sec.
Average service life of at least 10 years

Main technical characteristics of KPZ valves

Scheme and arrangement of the KPZ-50N valve

The device and principle of operation of the valve KPZ-50N

The safety shut-off valve KPZ-50N has a flanged body 1. Inside the body there is a seat, which is closed by a valve 2 with a rubber seal. Valve 2 is fixed on axis 3, which is located in housing 1. Springs 4 and 5 are installed on axis 3, one end of which rests against housing 1, the other against valve 2. At the end of axis 3, which goes out, a lever 6 is rigidly fixed, which rests against the lever 16. The control mechanism 7 is fixed on the body 1, which has a membrane 8, a rod 9 and a tip 15 rigidly fixed on the rod 9.

The tip 15 engages with the stop 12 of the lever 16 and prevents it from turning. the membrane is balanced by controlled pressure and springs 10 and 11, the force of which is regulated by bushings 13 and 14.

The principle of operation of the valve KPZ-50N

Valve KPZ-50N works as follows.

Controlled pressure is supplied to the submembrane cavity of the control mechanism 7, causing the tip 15 to be in the middle position. With an increase or decrease in pressure in the submembrane cavity beyond the setting limits, the tip 15 moves in one direction or another, and the stop 12 mounted on the lever 16 disengages from the tip 15, releasing the interconnected levers 16 and 6 and enabling axis 3 turn, while the force holding the tip 15 in a vertical position should be within 0.2 ... 0.5N. If necessary, it is adjusted by moving the bar 17 along the lever 16.

The force of springs 4 and 5 is transferred to valve 2, and valve 2 closes the gas passage.

Bringing the valve 2 into working condition after operation is carried out manually by turning the levers 6 and 16 until they are fixed with the tip 15, and the valve 2 is held in the open position.

Indication of safety measures when working with the KPZ-50N valve

Installation and operation of KPZ-50N valves must be carried out in accordance with the requirements of the industrial safety in the gas industry, approved by the State Committee for Technical Supervision of the Russian Federation and the passport for the valve.

Valves KPZ-50N must be installed so that the direction of gas flow coincides with the direction of the arrow on the valve body.

Valves KPZ-50N during operation do not have negative influence on the environment.

Preparing the KPZ-50N valve for operation

Preparing the product for installation.

Unpack the KPZ-50N valve, remove the transport plugs; to depreserve the surfaces of the valve parts from lubrication; check the valve by visual inspection for the absence of mechanical damage.

Placement and installation

The KPZ-50N damper must not be installed in environments that have a destructive effect on Aluminium alloy, steel, rubber and zinc coating.

The KPZ-50n valve is installed in front of the pressure regulator on a horizontal or vertical section gas pipeline.

The gas inlet must correspond to the arrow on the housing.

The impulse piping should be connected to the inlet gas line downstream of the regulator and should, if possible, slope upwards away from it and be free from areas where condensate can accumulate.

Installation and activation of the KPZ-50N damper must be carried out by a specialized construction and installation and operating organization in accordance with the approved project, technical specifications for construction and installation works.

The valve after adjustment by the consumer to the required response pressure must be sealed.

The procedure for working with the valve KPZ-50N

Upon completion of the installation of the valve, it should be adjusted to the operating parameters.

First, the KPZ-50N valve is adjusted to the upper limit of operation, changing the tension of the spring 11 by rotating the sleeve 14.

During tuning, the pressure in the impulse piping should be kept slightly below the set limit, and then slowly increase the pressure and check that the valve operates at the set upper limit.

When adjusting the lower limit of the valve operation, the rotation of the sleeve 13 changes the tension of the spring 10. During the adjustment of the pressure in the impulse tube, it is necessary to maintain a little above the set lower limit, and then slowly reduce the pressure and make sure that the valve operates at the set lower limit.

After the end of the adjustment, it will increase the pressure in the impulse tube and make sure that the valve operates again at the set upper limit.

Maintenance of KPZ-50N valve

The maintenance of the valve must be carried out according to the schedule.

A technical inspection and check of the setting and operation of the valve should be carried out once every two months, including once during routine repairs.

Scheduled preventive maintenance of the valve must be carried out at least once a year.

Delivery of valves KPZ-50N is carried out transport companies in such cities of Russia as: Moscow, St. Petersburg, Veliky Novgorod, Vologda, Kirov, Pskov, Yaroslavl, Kostroma, Tver, Ivanovo, Vladimir, Nizhny Novgorod, Yoshkar-Ola, Vitebsk, Smolensk, Kaluga, Minsk, Ryazan, Saransk, Bryansk, Penza, Syzran, Kursk, Lipetsk, Voronezh, Tambov, Belgorod, Volgograd, Rostov-on-Don, Donetsk, Lugansk, Simferopol Yalta, Alupka, Alushta, Feodosia, Kerch, Sevastopol, Sudak, Evpatoria, Uralsk, Aktyubinsk, Orenburg , Orsk, Karaganda, Krasnodar, Sochi, Taganrog, Novorossiysk, Stavropol, Elista, Nalchik, Kislovodsk, Pyatigorsk, Mineral water, Nevinnomyssk, Hot Key, Maikop, Tuapse, Gelendzhik, Armavir, Grozny, Vladikavkaz, Makhachkala, Kaspiysk, Izberbash, Derbent, Elista, Astrakhan, Samara, Ulyanovsk, Ufa, Izhevsk, Tolyatti, Kazan, Cheboksary, Yekaterinburg, Tyumen, Chelyabinsk, Kurgan, Omsk, Tomsk, Astana, Novosibirsk, Kemerovo, Barnaul, Novokuznetsk, Krasnoyarsk, Irkutsk, Ulan-Ude, Vladivostok, Yuzhno-Sakhalinsk, Arkhangelsk, Murmansk, Petrozavodsk, Ukhta, Syktyvkar, Perm, Nizhny Tagil, Naberezhnye Chelny, Magnitogorsk, Bishkek, Aktobe, Almaty, Astana, Pavlodar, Kostanay, Atyrau, Aktau, Shimkent, Khorgos, Talas, Karakol, Naryn, Osh, Jalal-abad, Batken, Kotlas, Surgut, Bratsk, Velsk, Rossosh.

In addition to the KPZ-50N valve itself, the delivery set includes: a certificate of conformity, a permit for use, a passport, a dimensional and functional diagram

Safety valves are produced in the following sizes: KPZ-25N, KPZ-25S, KPZ-25V, KPZ-50N, KPZ-50S, KPZ-50V, KPZ-80N, KPZ-80S, KPZ-80V, KPZ-100N, KPZ- 100S, KPZ-100V, KPZ-150N, KPZ-150S, KPZ-150V, KPZ-200N, KPZ-200S, KPZ-200V. We can also individually manufacture standard sizes KPZ-65N, KPZ-65S, KPZ-65V, KPZ-250N, KPZ-250S, KPZ-250V, KPZ-300N, KPZ-300S, KPZ-300V, KPZ-400N, KPZ-400S, KPZ -400V, KPZ-500N, KPZ-500S, KPZ-500V and large diameters.

Designed to automatically stop the supply of non-aggressive hydrocarbon gases to consumers when the controlled pressure rises and falls above the specified limits. Manufactured with nominal bore D have 50 low, medium or high controlled pressure.

Controlled environment - natural gas according to GOST 5542-87.

Connection - flange according to GOST 12820-80.

Specifications KPZ-50

The device and principle of operation of the KPZ-50

The valve has a cast iron flanged body 1 (see figure). Inside the body there is a seat, which is closed by a valve 2 with a rubber seal. Valve 2 is fixed on axis 3, which is located in housing 1. Springs 4, 5 are installed on axis 3, one end of which rests against housing 1, the other against valve 2. At the end of axis 3, which goes out, levers 6 are rigidly fixed, which rests against the lever 16. On the body 1 there is a control mechanism 7, which has a membrane 8, a rod 9 and a tip 15 rigidly fixed on the rod 9. The tip 15 engages with the stop 12 of the lever 16 and prevents it from turning. The membrane is balanced by controlled pressure and springs 10, 11, the forces of which are regulated by bushings 13, 14. Controlled pressure is supplied to the submembrane cavity of the control mechanism 7, causing the tip 15 to be in the middle position. With an increase or decrease in pressure in the submembrane cavity beyond the setting limits, the tip 15 moves, which releases the interconnected levers 16, 6 and allows the axis 3 to turn. The force from the action of springs 4, 5 is transferred to valve 2, and valve 2 closes the gas passage. Bringing the valve 2 into working condition after operation is done manually by turning the levers 6, 16 until they are fixed with the tip 15, and the valve 2 is held in the open position.

Increasing or decreasing the gas pressure after the pressure regulator in excess of the specified limits can lead to an emergency. With an excessive increase in gas pressure, flame separation from the burners and the appearance of an explosive mixture in the working volume of gas-using equipment, leakage, gas leakage in the joints of gas pipelines and fittings, failure of instrumentation, etc. are possible. A significant decrease in gas pressure can lead to slippage of the flame into the burner or extinction of the flame, which, if the gas supply is not turned off, will cause the formation of an explosive gas-air mixture in the furnaces and gas ducts of the units and in the premises of gasified buildings.

The reasons for the unacceptable increase or decrease in gas pressure after the pressure regulator for dead-end networks are:

Malfunction of the pressure regulator (jamming of the plunger, the formation of hydrate plugs in the seat and body, valve leakage, etc.);
incorrect selection of the pressure regulator according to its bandwidth, leading to a two-position mode of its operation at low gas flow rates and causing outbursts of output pressure and self-oscillations.
For ring and branched networks, the reasons for an unacceptable pressure change after the pressure regulator can be:

Malfunction of one or more pressure regulators supplying these networks;
incorrect hydraulic calculation of the network, due to which abrupt changes in gas consumption by large consumers lead to surges in outlet pressure.
common cause a sharp decrease in pressure for any networks may be a violation of the tightness of gas pipelines and fittings, and consequently, a gas leak.

To prevent an unacceptable increase or decrease in pressure in the hydraulic fracturing (GRPSh), high-speed safety shut-off valves (PZK) and safety valves are installed. relief valves(PSK).

PZK are intended for automatic stop of gas supply to consumers in case of increase or decrease in pressure over the set limits; they are installed after the pressure regulators. PZK work at " emergency situations”, so their spontaneous inclusion is unacceptable. Before manually turning on the slam-shut device, it is necessary to detect and eliminate malfunctions, and also make sure that the shut-off devices in front of all gas-using devices and units are closed. If, according to the conditions of production, a break in the gas supply is unacceptable, then instead of a shut-off valve, an alarm system should be provided to alert the maintenance personnel.

PSK are designed to discharge into the atmosphere a certain excess volume of gas from the gas pipeline after the pressure regulator in order to prevent pressure from rising above the set value; they are installed after the pressure regulator on the outlet pipeline.

In the presence of a flow meter (gas meter), PSK must be installed after the meter. For GRPSh, it is allowed to take out the PSK outside the cabinet. After reducing the controlled pressure to a predetermined value, the PSK must be hermetically sealed.

Safety shut-off valves
PZK is a valve open in operational condition. The flow of gas through it stops as soon as the pressure at the controlled point of the gas pipeline reaches the lower or upper limit of the slam-shut setting.

The following requirements are imposed on the PZK:

It must ensure hermetic closure of the gas supply to the regulator in the event of an increase or decrease in pressure behind it in excess of the established limits. The upper limit of the shut-off valve operation should not exceed the maximum working pressure after the regulator by more than 25%;
calculated for the inlet working pressure in the series: 0.05; 0.3; 0.6; 1.2; 1.6 MPa with a response range when pressure increases from 0.002 to 0.75 MPa, as well as a response range when pressure decreases from 0.0003 to 0.03 MPa;
the design should exclude spontaneous opening of the shut-off body without the intervention of maintenance personnel;
the tightness of the shut-off body must comply with class "A" in accordance with GOST 9544-93;
response accuracy should be ± 5% of the set values ​​of controlled pressure for slam-shut valves installed in hydraulic fracturing, and ± 10% for slam-shut valves in GRPSh and combined regulators;
response inertia should be no more than 40–60 s;
the free passage of the shut-off body must be at least 80% of the nominal passage of the slam-shut pipes;
the shut-off body should not be at the same time the executive body of the gas pressure regulator.
The sampling of the pulse of the controlled pressure of the SVK must be done near the point of sampling of the pulse of the pressure regulator, i.e. at a distance from the pressure regulator of at least five diameters of the outlet gas pipeline. It is unacceptable to connect the SVK impulse pipeline to the lower part of the horizontal section of the gas pipeline to prevent condensate from entering.

Slam-shut valves installed in GRPSh and on-site hydraulic distribution plants are often used as actuating mechanisms of safety automation that stop the gas supply when any of the controlled parameters deviates beyond the specified limits (including at the command of a gas contamination detector). In this case, the PZK is usually equipped with an electromagnetic device. PZK also includes thermal shut-off valves blocking pipelines in case of temperature increase up to 80–90° С.