Product introduction
XF rubber slowly-closing cut-off valve is a new water supply and drainage valve with full rubber structure, duck-mouthed appearance and functions of positive flow-in and reserve cut-off. According to thrust analysis and calculation as well as different operation conditions, it is manufactured with different design mechanism and different rubber products by special processing, At positive operation the water flow inform entrance and the valve will be open at weak hydraulic pressure. The hydraulic pressure is higher. The valve gate will open more greatly and the water flow is greater, At reserve operation, the valve gate closes naturally and seals tightly cut-off valve, the back pressure is higher, the valve gate closes more tightly and the seal effect is better. It is used widely in various drainage exits to prevent from pouring backwards and flowing backwards in city planning, water conservancy and sewage disposal etc, it is the ideal product to replace flap valve.

Product characteristics:
The advantages are specially marked in comparison with traditional flap valve:
A) Open and close automatically in security and reliability according to hydraulic difference without noise and in no need of operator and maintenance.
B) Positive start has little water resistance and start-up pressure and the flow can be adjusted naturally according to hydraulic pressure.
C) Reserve cut-off has good seal without leakage to prevent from flowing backwards. The back pressure is higher and the effect is barrier.
D) Anticorrosion, aging resistance, deformation resistance, strong adaptability and long use life
E) Wide size scope, nominal diameter of DN50-DN3000.

Application scope:
1) Excellent performance and wide application scope
2) Applicable for sewage system
3) Applicable for discharge system
4) Applicable for dyke discharge
5) Applicable for the drainage of airport and freeway
6) Applicable for sewer discharge
7) Applicable for sewage lagoon discharge
8) Smell separation

Installation structure type
1) Belled XF-T be installed at the exit of drainage pipe
2) Flanged XF-T be installed at the exit end with flange of drainage pipe
3) Mounting plate XF-F is installed on the building at the water exit end.
4) Build-in XF-F is installed at the exit end of rain and sewage system in cities.
5) Grout or cement pipe XF-T be installed at the end of grout or cement pipe.

Type	Nominal dia. of pipe	L for length	H for height	C for external dia. of flange
XF50-150-F	50	150	100	150
XF80-220-F	80	220	140	200
XF100-250-F	100	250	200	225
XF150-340-F	150	340	265	275
XF200-420-F	200	40	325	338
XF250-520-F	250	520	425	400
XF300-620-F	300	620	525	485
XF350-700-F	350	700	625	525
XF400-800-F	400	800	725	588
XF450-900-F	450	900	825	625
XF500-980-F	500	980	925	688
XF600-1120-F	600	1120	1025	800
XF700-1180-F	700	1180	1125	969
XF800-1350-F	800	1350	1400	1080
XF900-1500-F	900	1500	1525	1150
XF1000-1600-F	1000	1600	1725	1325
XF1200-1840-F	1200	1840	1950	1485