Double Chamber Pressure Relief Valve

Double Chamber Pressure Relief Valve

Basic information
Basic information
This valve can release pressure in the pipe above the safe value of the pilot valve and maintains the pressure in the pipe below the safe setting to prevent the pipeline or equipment from being damaged by high pressure in the pipe, can also maintain the upstream water supply pressure of the main valve above a set value to ensure the pressure in the upstream water supply area of the main valve. 
Features
Features
1. Accurate Pressure Control
2. Fast Opening to Maintain Line Pressure
3. Slow Closing to Prevents Surges
4. Completely Automatic Operation
Principle
Principle
The main valve disc imitates the action of the guide valve transfer through the hydraulic pressure pipe. The pilot valve is closed and the upstream pressure acts on the upper part of the diaphragm to keep the main valve closed as long as the upstream pressure is lower than the set value of the pilot valve. Once upstream pressure rises above the set pressure of the pilot valve, the pilot valve opens to drain the pressurized water above the diaphragm, no secondary water hammer is produced when the main valve is opened, a large amount of water will be released and the pressure will be lowered to the set value. 
Installation and Commissioning
Installation and Commissioning
As pressure release valve, the main valve is installed in the drain bypass; As pressure holding valve, the main valve is installed in series in the pipeline. To adjust the pressure, loosen the lock nut of the regulating screw of the opening valve first, turn the guide valve adjusting screw clockwise to increase the pressure, whereas reducing the pressure, lock the adjusting screw after the adjustment. For specific use, please consult ZhengFeng Valve Group.

Part

Material

Standard

Body

Ductile Iron

EN 1563/DIN 1693

Bonnet

Ductile Iron

EN 1563/DIN 1693

Trim

Stainless Steel 431

EN10088-1/ASTM A959

Seat

Stainless Steel 431

EN10088-1/ASTM A959

Diaphragm

EPDM / NBR

ISO 4633

Pilot Valve

Stainless Steel 431

EN10088-1/ASTM A959

For the materials options not listed, consult factory.

ZhengFeng manufactures valves in more than 50 different alloys.

Product scope, Standards & Materials
Size Range: 2"~24"
Pressure Rating: 10bar ~ 25bar
Face to Face Dimensions: AMSE B16.10, EN558-1
Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2
Coating: Fusion Bonded Epoxy Coating
Inspection and Test: ISO 5208 / EN 12226-2

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