China Silencing Check Valve Non Return Valve Manufacturers, Factory
Product Description
The silencing check valve is installed on the outlet pipe of water pumps, specially engineered to eliminate water hammer and operational noise. When the pump stops, an integrated spring assists the valve disc in closing quickly prior to flow reversal—activating when forward flow velocity approaches zero. Featuring a compact structural length, lightweight construction, low fluid resistance, fatigue resistance, and extended service life, it prevents backflow damage across pump units.
Water Hammer Elimination
Spring-assisted closure shuts the disc before flow reversal, dampening shockwaves and vibration.
Compact & Durable
Short face-to-face length, low flow resistance, robust fatigue resistance, and extended service life.
Wide Application
Reliable backflow prevention across water supply, drainage, fire protection, and HVAC systems.
Technical Specifications
| Size | DN50 – DN600 |
|---|---|
| Pressure Rating | PN6, PN10, PN16, CL150 |
| Face to Face STD | API609, BS5155, DIN3202, ISO5752 |
| Connection STD | PN6, PN10, PN16, DIN 2501 PN6/10/16, BS5155 |
Material Specifications
| Body | Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB A216), Stainless Steel (SS304 / SS316 / SS304L / SS316L), Duplex Stainless Steel (2507 / 1.4529), Bronze, Aluminium Alloy |
|---|---|
| Disc | DI+Ni, Carbon Steel (WCB A216), Stainless Steel (SS304 / SS316 / SS304L / SS316L), Duplex Stainless Steel (2507 / 1.4529), Bronze, DI/WCB/SS coated with Epoxy Painting, Nylon, EPDM, NBR, PTFE, or PFA |
| Stem / Shaft | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel |
| Seat | NBR, EPDM / REPDM, PTFE / RPTFE, Viton, Neoprene, Hypalon, Silicon, PFA |
Product Gallery
Frequently Asked Questions (FAQ)
Where is the silencing check valve installed?
It is installed directly on the outlet pipe of water pumps across water supply, drainage, fire protection, and HVAC systems.
How does the valve eliminate water hammer and noise?
When the pump stops, an internal spring assists the valve disc to close rapidly in advance as the forward flow rate drops near zero, preventing counter-current slamming and acoustic shock.
What size and pressure ranges are supported?
Available sizes range from DN50 to DN600, with pressure ratings including PN6, PN10, PN16, and CL150.
Which face-to-face and connection standards apply?
Face-to-face dimensions follow API609, BS5155, DIN3202, and ISO5752. Flange connection standards comply with PN6, PN10, PN16, DIN 2501, and BS5155.
What body and disc materials can be selected?
Bodies are available in Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB A216), Stainless Steel (SS304/SS316/SS304L/SS316L), Duplex Stainless Steel (2507/1.4529), Bronze, and Aluminium Alloy. Discs can also be coated with Epoxy, Nylon, EPDM, NBR, PTFE, or PFA.
What seating options are available?
Seat material options include NBR, EPDM/REPDM, PTFE/RPTFE, Viton, Neoprene, Hypalon, Silicon, and PFA to handle diverse medium requirements.
