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

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.