Anti Water Hammer Valve

Anti Water Hammer Valve

Basic Information
Basic Information
This valve is used to reduce the pressure fluctuation caused by the sharp change in the flow rate when the pump is closed or stopped due to power failure, thus protecting the water pump system.
Features
Features
1. The double pilot valve can sense low-pressure waves and high-pressure waves.
2. Sensitive induction, quick control
3. Fast Opening to Maintain Line Pressure
4. Full port, small fluid resistance

Principle
Principle
Generally, the sudden stop of the pump will produce huge pressure fluctuations, the pressure in the sampling tube will also fluctuate at this time. The low-pressure pilot valve senses this initial pressure wave to open the drain so that the main valve opens to prevent high-pressure fluctuations from returning from the system. The opened main valve drains high-pressure waves into the atmosphere. The high-pressure pilot valve induces high-pressure waves which also open and keeps the main valve open. When the system pressure is lower than the preset pressure of the pilot valve, the high-pressure pilot valve is closed, the pressure of the main valve control room is increased, and the main valve is closed to maintain the system pressure in the pilot valve preset pressure. 
Installation and Commissioning
Installation and Commissioning
Determine the high and low-pressure settings, and adjust the pipeline pressure at low-pressure settings. At this point, the low-pressure pilot valve is set at the critical state of opening and closing and locking the nut. Adjust the pipeline pressure to the high pressure setting value, set the high-pressure pilot valve to the critical state of opening and closing to lock the nut. 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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