Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 11, 2018
Patent Application Number
15440456
Date Filed
February 23, 2017
Patent Citations Received
Patent Primary Examiner
Patent abstract
A double-piston-effect valve includes two valve seats symmetrically arranged in two valve endcaps at two sides, respectively. A piston ring is arranged on a rear of each of the valve seats, an inner O-ring groove is provided in the piston ring along an inner circumferential direction, an outer O-ring groove is arranged in the piston ring along an outer circumferential direction, an O-ring is fitted in each of the inner O-ring groove and the outer O-ring groove, and two semi-circular notches are symmetrically provided in a protruding portion of the piston ring.
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