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Pressure relief / pressure holding valve

Pressure relief / pressure holding valve

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Describe
First, GL500X pressure relief valve, pressure valve overview
 
The GL500X Pressure Relief/Pressure Valve is primarily used in fire or other water supply systems to prevent system overpressure or to maintain pressure on the fire water supply system. The impact of the water hammer can also be reduced after the fire pump is turned off. Also used in water hammer devices for large water supply systems. And the cleaning control screen is installed at the inlet of the valve control system. The fluid characteristics are used to make the suspended particles with larger specific gravity and larger diameter not enter the control system, ensuring unobstructed circulation of the system and enabling the valve to operate safely and reliably. The system operates smoothly, with high strength and long service life.
 
Second, GL500X pressure relief valve, pressure valve structure features and uses
 
The GL500X Pressure Relief/Pressure Valve consists of a main valve, a pressure relief/pressure holding pilot needle valve, a ball valve, a microfilter and a pressure gauge to form a hydraulic control takeover system. It can be used as a pressure relief valve or as a pressure holding valve by hydraulic automatic operation. When used as a pressure relief valve, the water supply line pressure can be maintained below the set safety value; for the pressure holding valve, the upstream water pressure of the main valve can be maintained above the set value to maintain the upstream supply pressure of the main valve. This product utilizes hydraulic self-power control, does not require other devices and energy, and is easy to maintain, with multiple valves. This series of valve products are widely used in high-rise buildings, living areas and other water supply pipe network systems and urban water supply projects.
 
Third, GL500X pressure relief valve, the working principle of the pressure valve
 
1. As a pressure relief valve: when the pressure relief/pressure holding pilot valve is adjusted to the pressure relief state, the water flows through the needle valve, the main valve control chamber, the ball valve A, the pressure relief/pressure holding pilot valve, and the ball valve B to the outlet. The main valve is open. When the inlet pressure exceeds the safe value set by the pressure relief/pressure holding pilot valve, the pressure relief pilot valve will automatically open, and part of the water is discharged through the ball valve C to relieve the pressure of the pipeline. The pressure relief valve automatically closes when the pressure returns to a safe value. When the pressure relief valve is used, each ball valve is normally open.
2. As the holding pressure valve: When the pressure relief/pressure holding pilot valve is adjusted to the holding pressure state, the pilot valve is closed as long as the main valve inlet water pressure is lower than the pilot valve setting value. The main control room is boosted and the main valve is closed. When the upstream supply pressure of the main valve exceeds the set pressure of the pilot valve, the holding pilot valve can be opened, the water in the control chamber is discharged to the outlet through the ball valve, and the main valve of the control chamber is opened, and the water supply is started, that is, the upstream water pressure is maintained. When used as a pressure holding valve, the ball valve C is normally closed or replaced with a wire plug.
 
Fourth, GL500X pressure relief valve, pressure valve Main technical parameters
 

Nominal pressure(Mpa)

Shell test pressure(MPa)

Seal test pressure(MPa)

Applicable medium

Medium temperature(℃)

1.0

1.5

1.1

water

0-80

1.6

2.4

1.76

2.5

3.75

2.75

 

Five, GL500X pressure relief valve, pressure valve Main parts and materials

 

Part Name

Part material

Valve body bonnet

WCB

Seat valve disc

Copper alloy

Seal ring O-ring

Nitrile rubber

Valve stem

2Cr13

spring

50CrVA

Needle valve

Copper alloy

Ball valve

Copper alloy

Float valve

Copper alloy

Micro filter

stainless steel

 

Seven, GL500X pressure relief valve, pressure valve main size

 

Nominal diameter (mm)

size(mm)

L

H

H1

20

150

557

463

25

160

557

463

32

180

557

463

40

200

610

516

50

203

610

516

65

216

625

520

80

241

642

537

100

292

750

596

125

330

808

653

150

356

864

709

200

495

1135

805

250

622

1185

855

300

698

1325

953

350

787

1385

990

400

914

1445

1030

450

978

1445

1030