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.

XF50-158-T	50	158	100	25
XF80-232-T	80	232	140	40
XF100-270-T	100	270	200	40
XF150-360-T	150	360	265	50
XF200-450-T	200	450	325	50
XF250-560-T	250	560	425	75
XF300-650-T	300	650	525	115
XF350-750-T	350	750	625	115
XF400-850-T	400	850	725	135
XF450-950-T	450	950	825	150
XF500-1060-T	500	1060	925	200
XF600-1200-T	600	1200	1025	200
XF700-1200-T	700	1260	1125	200
XF800-1450-T	800	1450	1400	250
XF900-1620-T	900	1620	1525	250
XF1000-1720-T	1000	1720	1725	250
XF1200-2010-T	1200	2010	1950	300
XF1400-2280-T	1400	2280	2320	320
XF1600-2600-T	1600	2600	2650	350
XF1800-2920-T	1800	2920	2960	400
XF2000-3150-T	2000	3150	3300	450
XF2200-3450-T	2200	3450	3580	500
XF2400-3760-T	2400	3760	3925	550
XF2600-3900-T	2600	3900	4250	600
XF2800-4200-T	2800	4200	4580	650
XF3000-4500-T	3000	4500	4990	700