Rubber back valve

Patent :
Patent number : 200320113496
New type rubber back valve ,main body is rubber body , rear end is duchbill shape,front is clamp,with unique character is good elasticity,ligh weight,shock absorption,resistance to acid,alkali,oil,easy to install ,remove defect of metal check valve ,save labor cost ,bringing convience to users.Duckbill-shaped valve was designed back-end like metal check valve in the valve plate, as no fluid flow out of date, the duckbill-type valve on the outlet to rely on back pressure to seal the force generated outlet, to prevent liquid return. When a fluid through, it will open .

Filing data :	19th DEC , 2003
Publish data :
Authorized the announcement date :	1 st ,DEC , 2004
The applicant / patentee :	Mr ZhaoChangyu
Application address :	Henan Changmao Yuanyi Valve Co.,ltd .
Inventer :	Ms Yin
Patent Represent Institute :	Zhengzhou lianke Patent Institute
Agent :	Mr Shi
Patent type :	Patent :
Classification NO.:	F16K15/14

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Rubber back valve ,rubber slow close ,duch bill valve ,pipe check valve .
Patent certificate of rubber back valve --Henan Changmao Yuanyi Valve Co.,ltd

Patent certificate of rubber back valve --Henan Changmao Yuanyi Valve Co.,ltd