Silent Check Valves

Specifications

Quiet Operation: Prevents water hammer by closing before reverse flow starts.

Spring-Assisted Closure: Allows both horizontal and vertical installation.

Low Head Loss: Streamlined internal design minimizes flow resistance.

Versatile Materials: Available in, stainless steel, ductile iron, etc.

Compact Design: face-to-face length compared to swing types.

 

Flow Begins

The forward flow pressure pushes the valve's disc or poppet open against the spring force.

Flow Stops / Reverses:

As soon as the forward velocity drops to zero, the spring quickly pushes the disc back to its seat before reverse flow can develop.

This quick closure eliminates the slam and noise common in swing check valves.

Q: What is a Silent Check Valve?
A silent check valve is a type of non-return valve designed to prevent reverse flow in piping systems while closing quickly and quietly, without the slamming noise often associated with swing check valves. It typically uses a spring-assisted disc that closes before reverse flow occurs.

Q: How does a Silent Check Valve work?
When fluid flows in the forward direction, the internal spring compresses and the disc opens. When the flow stops or reverses, the spring pushes the disc back to the closed position instantly, preventing backflow and eliminating water hammer.

Q: Where are Silent Check Valves used?
HVAC chilled water systems

Pump discharge lines

High-rise building water supply systems

Industrial process piping

Irrigation systems

Q: What are the main benefits of Silent Check Valves?
Quiet operation – no loud slamming noise

Water hammer prevention – closes before reverse flow begins

Compact design – often fits in tight spaces

Durability – fewer moving parts, reduced wear

Q: What materials are available for Silent Check Valves?
Common body materials:

Cast iron

Ductile iron

Carbon steel

Stainless steel
Disc materials:

Bronze

Stainless steel

EPDM/NBR resilient seat options for better sealing