Safety discharge valve 50. Safety reset valve PSK. Direct Action Pressure Regulator

To reset the gas behind the regulator in the case of a short-term increase in gas pressure over the installed, safety dumping valves (PSK) should be applied. PSK is a fitting fitness in the operating state; It opens for a short period of time, and after reaching the pressure at a controlled point of the nominal value automatically closed.

Psk can be spring and membrane. Spring PSKs must be equipped with a device for their forced discovery and control purge in order to prevent stripping, faceting and sticking the spool to the saddle, as well as to remove solid particles that have occurred between sealing surfaces.

PSK is divided into full-dimensional and low lifting. At low lifting valves (type PSK), the opening of the shutter occurs gradually, in proportion to the increase in pressure in the controlled point of the gas pipeline. The full-dimensional valves (SPPKR4R-16) are opened completely and sharply, jerky, and also sharply, with a shovel of the saddle of the saddle, closes when the pressure decreases. That is, the full-dimensional valve has a two-position position: "closed" and "openly".

When the maximum permissible pressure setting is reached, the PSK should be discussed to open up to the full lift, it is steadily operating in the open position. The shutter should be closed when the pressure decreases to the nominal or below it by 5% and ensure tightness. In case of lagging closure of the shutter, the gas pressure on the network can significantly reduce what can lead to a violation of the operation mode of the system, as well as emission to the atmosphere relatively large number Gas.

At low lifting PSK when closing the shutter after discharge need quantity Gas is difficult to achieve the gate tightness, as it may be more likely to make an effort more than in the "closed" mode.

Such PSKs cease to discharge the gas only after the pressure is reduced to 0.8-0.85% of the working pressure, which leads to a constant or long-term discharge of gas into the atmosphere. The main advantage of membrane PSCs is the presence of an elastic membrane in their design that performs the role of a sensitive element. If in spring valves The spool performs functions and a sensitive element, and a shut-off body, then in the membrane valves, the spool performs only locking functions. The membrane allows you to increase the sensitivity of the PSK as a whole and expand their area of \u200b\u200buse, including low gas pressure. PSK must provide opening when the installed working pressure is exceeded by no more than 15%.

The selection of the design of the PCC should be made in accordance with the bandwidth.

The amount of gas to be discharged by PSK should be determined:

if there is a pressure regulator of the PZK according to the formula Q≥0.0005Q D, where q is the amount of gas to reset the PSK for an hour at t \u003d 0 ° C and p bar \u003d 0,10132 MPa, m 3 / h; Q d - the calculated bandwidth of the pressure regulator at T \u003d 0 ° C and p bar \u003d 0,10132 MPa, M 3 / h;
in the absence of PPC pressure in the formulas before the pressure regulator: for pressure regulators with a saddle gate - Q≥0.01Q d, for regulating dampers - Q≥0.02Q d.

Low-dimensional membrane and spring PSK have a small bandwidth. Thus, the bandwidth of the SPPC4R-50-16 (the diameter of the seat 30 mm) at a operating pressure of 0.125 MPa is 830 m3 / h, and PSK-50C / 125 (the diameter of the seat 50 mm) is only 10 m3 / h. This is due to the low height of the lifting of the spool. Bandwidth PSK-50 valves (KPS-50) with guide ribs at low pressure is: 0.5-3 m3 / h, on average - 7-20 m3 / h (at a pressure in the inlet nozzle of PSK 1.15 adjustment pressure).

The PSK-50 bandwidth without guide edges with the same parameters can be taken twice as large.

The table (p. 1245) shows the main specifications Serially produced PSK. In addition to these PSK, discharge valves may also be part ( composite element) Combined gas pressure regulators.

Valves Safety dumping PCs are designed to automatically reset the gas into the atmosphere when the pressure is raised over the set values.

Workspace - natural gas According to GOST 5542-2014. The temperature of the working medium from minus 10 to plus 40ºС. Tightness of the valve shutter - class A according to GOST 9544-2015.

Valves are used in gas distribution systems and gas consumption.

The operating conditions of the valves of the PSK must match climatic execution U3 according to GOST 15150-69 (limiting operating values \u200b\u200bof air temperature from minus 40 to + 45c).

Valves are manufactured with a conditional passage of DN 25 and DN 50, low, medium and high pressure triggering.

Type of compound with gas pipeline:
- carving internal pipe according to GOST 6357-81;
- flange according to GOST 33259-2015.

The valve is equipped with a device for forced purge. The high energy efficiency of the valve is determined by its design - the gas loss during operation is not available.

PCV valves prevent gas pressure increase after a regulator to eliminate false response shut-off valve. This is usually observed in the system during transitional modes or the absence of gas consumption.

At the enterprise LLC PKF "Ex-Form" Relief valves of PSK
Available on TU 3712-008-12213528-2011.

PSK valves are issued several types:

With conditional pass DN 25:
- Dumping valves low pressure Trigger - PSK-25 Pn
- Disposable high pressure valves - PSK-25 P-B.
With a conditional pass DN 50:
- Dumping Low Pressure Pressure Valves - PSK-50P-N / 20
- Remain valves of average response pressure - PSK-50P-C / 50
- Discharge valves of average response pressure - PSK-50P-C / 125
- Discharge valves of high pressure trigger - PSK-50P-V / 1000

Specifications of PSK valves

Execution	DN.	Range settings, kpa	Pass ability Max M 3 / h	Weight
Execution	DN.	Range settings, kpa	Pass ability Max M 3 / h	Weight
PSK-25PN		2 – 75	21	3 kg
PSK-25PV.		60 – 750	124	3 kg
PSK-25N / 5		2 – 5	16,5	3 kg
PSK-25C / 20		5 – 20	56	3 kg
PSK-25C / 50		20 – 50	44	3 kg
PSK-25C / 125		50 – 125	231	3 kg
PSK-25C / 300		125 – 300	345	3 kg
PSK-25B / 700		300 – 700	623	3 kg
PSK-50PN / 20		2 – 20	14,5	4.5 kg
PSK-50PS / 50		20 – 50	74	4.5 kg
PSK-50PS / 125		50 – 125	170	4.5 kg
PSK-50PV / 1000		125 – 1000	268	4.5 kg
PSK-50N / 5		2 – 5	79	4.5 kg
PSK-50C / 20		5 – 20	83	4.5 kg
PSK-50C / 50		20 – 50	108	4.5 kg
PSK-50C / 125		50 – 125	464	4.5 kg
PSK-50C / 300		125 – 300	354	4.5 kg
PSK-50B / 700		300 – 700	635	4.5 kg
PSK-25PFN		2 – 75	21	5.5 kg
PSK-25PFV		60 – 750	124	5.5 kg
PSK-25FN / 5		2 – 5	16,5	5.5 kg
PSK-25FS / 20		5 – 20	56	5.5 kg
PSK-25FS / 50		20 – 50	44	5.5 kg
PSK-25PS / 125		50 – 125	231	5.5 kg
PSK-25FS / 300		125 – 300	345	5.5 kg
PSK-25FV / 700		300 – 700	623	5.5 kg
PSK-50PFN / 20		2 – 20	14,5	10 kg
PSK-50PFS / 50		20 – 50	74	10 kg
PSK-50PFS / 125		50 – 125	170	10 kg
PSK-50PFV / 1000		125 – 1000	268	10 kg
PSK-50FN / 5		2 – 5	79	10 kg
PSK-50FS / 20		5 – 20	83	10 kg
PSK-50FS / 50		20 – 50	108	10 kg
PSK-50FS / 125		50 – 125	464	10 kg
PSK-50FS / 300		125 – 300	354	10 kg
PSK-50FV / 700		300 – 700	635	10 kg

Closing Pressure: 0.9 P Settings

The appointed service life of the valve - 35 years, subject to timely replacement in the process of operation of parts and components, having a smaller, naturally limited, service life (for sealing, sealing gaskets, rings - 5 years, for membranes - 5 years, for spring - 10 years ).

Overall dimensions of PSK-25

Overall dimensions of PSK-50

Valve device PSK.

The valve body is made in the form of a truncated cone with a flange, a saddle and two holes with a pipe cylindrical 1-inch carvings - execution of PSK-25P, 2 inches - PSK-50P or with metric thread M36x1.5 - PCT-25 PPF and M56x2 - PCT-50PF.

The saddle overlaps the valve pos. 3 with rubber seal. The valve is assembled with membrane pos. 6, which is rigidly fixed between the valve and the dish of pos. 7. In turn, the membrane is fixed between the case of pos. 1 and lid pos. 2.

Spring pos. 4 clamped between a plate of membrane and emphasis poses. 8. By rotating the adjusting screw Pos. 5 Moves the stop pos. 8, thus modifying the spring force, which determines the setting of the valve to the pressure at the specified limits.

To test the performance, the valve is equipped with a compulsory opening mechanism, which is activated by the positive pos. nine.

Preparation and launch of a product to work

The valve is set in such a way that the direction of movement of the medium coincides with the direction of the arrow on the body of the product, or according to lettering designspecified on the body of the product.

The crane before PSK should be open and sesso. All compounds of the strapping of gas fittings when installing PSK are tested for tightness. Gas leakage via loosenness of connections are not allowed.

Set the PSK of low response pressure (marked with the letter H) in the operating position it is necessary to cover down. PSK Middle and High Pressure Settings (marked with the letters "C" and "B") can be installed in any position.

To test the performance of the valve, it is necessary to draw a forced opening mechanism (pos. 9). In this case, the valve opens. Operation Repeat 3 - 4 times.

Turning on the valve is performed by rotating the adjusting screw (pos. 5) to the desired parameters of the trigger. Screw is easily accessible. The rotation of the screw is easy, without jail.

Safe full stop operation of the valve is made by closing the crane installed in front of the valve.

Principle of operation of the valve

Gas from the network through the inlet of the case enters the valve cavity.

With the steady mode, the controlled gas pressure in the set limits is bated the tuned spring, and the valve is hermetically closed.

When the gas pressure on the network (also in the valve cavity) exceeds the setting limit, the membrane, overcoming the spring force, drops together with the valve, opening the gas output to the atmosphere through the dumping nozzle.

The gas reset will occur until the pressure is reduced below the customized, after which the valve closes under the action of the spring.

Price, Production Terms, Delivery Terms

The price of PSK valves is provided on the official request to our company. The deadline for the manufacture of reset valves does not exceed 20 days. There are also warehouse stocks. Delivery is carried out in all areas of the Russian Federation, as well as the territory of the CIS countries by any kind of transport.

Warranty period - 36 months from the date of commissioning, but not more than 42 months from the date of manufacture.

The appointed valve service is 35 years old.

According to a special order of the consumer, the valves can be adjusted to the specified trigger pressure in accordance with a specific order or technical task and seal.

To reset the gas behind the regulator in the case of a short-term increase in gas pressure over the installed, safety dumping valves (PSK) should be applied.

PSK is a fitting fitness in the operating state; It opens on a short period of time, and after reaching the pressure at a controlled point of the nominal value, it is automatically closed.

When the maximum allowable pressure setting is achieved, the PSK should be discussed to open up to a complete lift, it is stable in the open position. The shutter should be closed when the pressure decreases to the nominal or below it by 5% and ensure tightness. In case of lagging closing of the shutter, the gas pressure on the network can significantly decrease, which can lead to a violation of the operation mode of the system, as well as the emission of a relatively large amount of gas into the atmosphere.

At low-dimensional PSK, when closing the shutter after the discharge of the required amount of gas, it is difficult to achieve a shutter tightness, since it is necessary to make an effort more than in the "closed" mode. Such PSKs cease to discharge the gas only after the pressure is reduced to 0.8-0.85% of the working pressure, which leads to a constant or long-term discharge of gas into the atmosphere. The main advantage of membrane PSCs is the presence of an elastic membrane in their design that performs the role of a sensitive element. If in spring valves, the spool performs functions and a sensitive element, and a locking organ, then in the membrane valves, the spool performs only locking functions. The membrane allows you to increase the sensitivity of the PSK as a whole and expand their area of \u200b\u200buse, including low gas pressure. The PSK should provide opening when the installed working pressure is exceeded by no more than 15%.

The selection of the design of the PCC should be made in accordance with the bandwidth.

The amount of gas to be discharged by PSK should be determined:

If there is a PZK pressure regulator according to the Q≥0.0005Qd formula, where q is the amount of gas to reset the PSK for an hour at T \u003d 0 ° C and RBAR \u003d 0.10132 MPa, m³ / h; QD - the calculated bandwidth of the pressure regulator at T \u003d 0 ° C and RBAR \u003d 0,10132 MPa, m³ / h;
In the absence of PPC pressure in front of the pressure regulator according to the formulas: for pressure regulators with a paddle gate Q≥0.01QD, for regulating valves Q≥0.02QD.
Low-dimensional membrane and spring PSK have a small bandwidth. Thus, the throughput capacity of the SPPC4R-50-16 (the diameter of the seat 30 mm) at a operating pressure of 0.125 MPa is 830 m³ / h, and PSK-50C / 125 (the diameter of the seat 50 mm) is only 10 m³ / h. This is due to the low height of the lifting of the spool. The capacity of the PSK-50 valves (CPS-50) with guide ribs at low pressure is: 0.5-3 m³ / h, on average - 7-20 m³ / h (at a pressure in the inlet nozzle of PSK 1.15 adjustment pressure) .

The capacity of PSK-50 without guide edges can be taken twice as large as the same parameters. In addition to these PSK, dumping valves may also be part of the (composite element) of combined gas pressure regulators.

Description

In order to limit the gas pressure indicator using the method of resetting it into the atmosphere in cases of exceeding the permissible value, resetting devices of PSK-50 are applied. Products are installed at stations, gas pipelines characterized by different pressure indicators. Operational conditions belong to UHL 2Gost 15150-69, that is, optimal work Provided at a temperature -40 ° C to + 60 ° C.

Such valves do not have negative influence Atmosphere I. environment. The service life is at least 15 years. The design is a housing, covers with a seal, screw, plates, springs, membranes. When the pressure changes, the valve opens, which provides gas output. After the process is completed, the valve returns to the closed state.

We also offer you to buy a repair clamp at a bargain price.

Specifications
Safety valve reset

Name of parameter or size	Value
1 diameter of the conditional passage, mm	50
2 Maximum valve opening pressure, kPa (kgf / cm 2)
PSK-50N / 5	5(0,05)
PSK-50C / 20	20(0,2)
PSK-50C / 50	50(0,5)
PSK-50C / 125	125(1,25)
PSK-50B / 400	400 (4)
PSK-50B / 700	700 (7)
3 Range of triggering, kPa
PSK-50N / 5	from 2 to 5
PSK-50C / 20	from 5 to 20
PSK-50C / 50	from 20 to 50
PSK-50C / 125	from 50 to 125
PSK-50B / 400	125 to 400
PSK-50B / 700	from 400 to 700
Grade 4 shutter tightness	In according to GOST 9544-2005
5 Connecting dimensions: at the entrance and at the exit carving internal pipe according to GOST 6357-81, inches	2
6 dimensions, mm, no more
- Diameter	220
- Height	255
7 mass, kg, no more	5,0