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flap valve

  • Product Name:  flap valve
  • Product Details:  flap valve

Flap Valve
Flap valves are designed for use on the discharge end of pipes to prevent backflow or intrusion into the pipe. Typical applications include discharges to reservoirs, ponding basins and standpipes. Permits the outflow of water from a pipe or structure while preventing backflow.   Used in reservoirs, tidal basins, ponding basins, pump stands and storm drain systems where seating heads are less than ten feet.

Features and Benefit
·Material as FRP, carbon steel, stainless steel, cast iron, HDPE for select
·Wide supply range(100mm to 3000mm or larger), customized designs available
·Reliable backflow prevention
·Smart design eliminates maintenance
·Corrosion resistant, will not warp or freeze open or shut
·No cracking pressure needed, low head loss, can be completely open to flood discharge
·Environmentally-friendly

Specifications


Nominal diameter:
DN25mm to DN3000mm, customizing design available
Maximum working pressure:
25 meter water
Operating temperature:
-20℃-100℃(for usual)
Open angle
>90 Deg
Corrosion resistance
Yes
Applicable media
Sea water, drinking water, slurry, industrial sewage.

Components/Materials/Functions


NO.
Components
Materials
Functions
1
Seat
By Request
Support
2
Flange
By Request
Fasten
3
Gate
By Request
Flow Control
4
Seal
By Request
Seal
5
Sleeve
HDPE
Anti-abrasion
6
Hinge Pine
SS 304
Hinge
7
Nut
SS 304
Fasten
8
Cotter Pin
SS 304
Fasten
9
Eye Bolt
SS 304
Support

Design of FRP Flap Valves:

Design of HDPE Flap Valves:

Note:
Usually the flange drilling standard is based on DIN PN6, other standards available as ANSI CLASS150/300, DIN PN16/25, JIS10 etc. For special application, please contact GYLDT for detailed design.