Double Chamber Hydraulic Check Valve

Double Chamber Hydraulic Check Valve

Basic Information
Basic Information
This valve prevents backflow of media and reduces water hammer.

Features
Features
1. Open slowly, close quickly and close slowly to prevent water hammer;
2. Use the pressure change of the medium to control the power automatically;
3. Valve operation is not affected by the pump head and flow change;
4. Streamline design with low-pressure loss and large flow.

Principle
Principle
When the water pump is opened, the water inlet pressure ACTS under the valve disc. Meanwhile, the water inlet pressure also enters under the diaphragm through the inlet side ball valve and filter, making the valve open slowly to prevent the formation of the pump opening water hammer. When stopping the pump, the valve disc, under the action of self-weight and spring, first closes 90% quickly to prevent water from flowing backward, preventing the production of stop pump water hammer. The remaining 10% enters the upper part of the diaphragm through the ball valve and filtration at the outlet end.
Installation and Commissioning
Installation and Commissioning
Before installation, please check whether all parts of the main valve are in good condition, complete fasteners, and no looseness; Open the ball valve at the inlet and outlet of the main valve and adjust the opening of the ball valve at the outlet to obtain the best closing and opening speed. 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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