High Pressure Shut-off Valve

High Pressure Shut-off Valve

Basic information
Basic information
This valve is closed after the fire pump is started to cut off the domestic water and ensure the firefighting water. When the fire pump is closed, the valve automatically opens to cut off the firefighting water and restore the domestic water supply system. 
Features
Features
1. Accurate Pressure Control
2. Sensitive induction, quick control
3. Completely Automatic Operation
4. Save on plumbing and water costs
Principle
Principle
The pilot valve is opened when the inlet pressure of the main valve is lower than the set pressure of the pilot valve. The main valve opens and water flows out through the main valve through the outlet. When the firefighting pump starts or frequency conversion pump pressure increases, exceeding the set pressure of the pilot valve, the pressure of the main valve inlet guide valve is increased, the pressure acting on the spring is increased, the pressure is pressed down, the pilot valve is closed. At this point, the inlet pressure of the main valve is continuously supplemented to the control room of the main valve through the ball valve. The downward pressure on the valve disc is greater than the upward thrust to close the main valve. 
Installation and Commissioning
Installation and Commissioning
Piping should be cleaned before using. When the inlet pressure is less than the set pressure, the valve is always open, if the inlet pressure is greater than the set pressure, the valve is closed. 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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