Ductile Iron Check Valve
Ductile iron Silent check valves with flange
product detail
Silent check valve is also called nozzle check valve, which can close without water hammer. Silent check valves are designed to react to the high deceleration rates by closing very quickly, prior to the reverse velocity reaching damaging levels.?
When the source moving the fluid shuts down and the forward flow of the fluid decreases, the specially designed stainless steel spring action of the silent check valve controls the valve disc closure to occur prior to flow reversal. This spring assist insures that the valve does not slam shut, and the occurrence of water hammer is eliminated.
Quick Detail：
ductile iron vertical silent check valves with flange ends ?
Design standard: DIN3202 F6
Body material: ductile iron
Shaft: stainless steel 304
Spring: Stainless steel 304
Body seat: Stainless steel welded overlay finish, micro finished
Disc Seat: EPDM
Nominal diameter: DN200 ?8”
Pressure: PN10 PN16 End connection: RF. Flange EN1092-1
Face to face: EN558-1/8
Working temperature: -40℃~+100℃.
Test and inspection: EN12266-1
Epoxy Powder coated inside and outside
EN 10204 3.1 with each delivered valve ?
Product Range:
Available Body Material: Cast Iron GG25, Ductile iron GGG40, GGG50
Optional body Seat Ring: SS304, SS316, SS316L, Bronze Optional
Seat Ring: EPDM, NBR, PTFE.
Flange Ends: BS4504/EN1092-1 PN16/ ANSI B16.5 RF Size Range: DN50-DN600 (2”-24”) Pressure Range: PN10, PN16, PN20(150LBS)
Optional surface color: RAL5002, RAL5015. RAL5005, red, black. Or customized ? ?
Performance:?
Silent Check Valve is used as protection against reverse flow when power failure in areas where noise pollution or water hammering is a critical issue. It can provide not only quiet performance but also low head loss ·High strength ductile iron body used for durability and less weight. ·Advanced dynamic design of single body with diffuser provides streamline flow and assures lower head loss. ·One of the lowest head loss check valve, big save in pumping power cost, valve disc with shorter stroker and spring reverse faster than most of check valve. ·Coated with powder epoxy both inside & outside for corrosion resistance. ·Bronze bushing reduce wearing problem during operation. ·Hydrodynamic design with spring ensures non slamming and water hammerless. ·Stainless steel spring hidden in the diffuser under protection while valve in operation. ·Disc will positively close before reverse flow, and maximize the closing speed up to 0.2 Sec. ·
Installation can be vertical/horizontal/inclined. ·
Comply with EN 558-1, ISO 5752 and EN 1092-2, ISO 7005-2 flange dimension.
APPLICATIONS
Dams & hydropower, Irrigation, Water treatment
