Patent ID: 9677677
Date: 2017-06-13
CPC Classifications: F16K,Y10T

Claim:
1. A check valve with a flexible membrane, the check valve comprising: a hollow body; a seat disposed inside the hollow body transversely thereto, said seat being provided with passage ports; and the flexible membrane capable of being urged against the seat while plugging said passage ports thereof, or being spaced apart from said passage ports, said flexible membrane being maintained either by a center of said flexible membrane or by a periphery of said flexible membrane, wherein said passage ports have each an oblong shape such that each passage port has a greatest dimension and a smallest dimension, each passage port being disposed such that the greatest dimension is oriented along a respective radial direction of said seat, wherein each of said passage port is defined, on a face of said seat turned towards said flexible membrane by: said distal edge is composed of one middle segment, and of two curvilinear segments, each curvilinear segment connecting said middle segment to one respective radial edge, said middle segment having, along a tangential direction, a length lower than half of a greatest width of said passage port.