Patent ID: 9739386
Date: 2017-08-22
CPC Classifications: F16K

Claim:
1. A check valve comprising: a housing having a valve seat and a downstream flow path, wherein the valve seat has an opening for introducing a fluid from an upstream flow path and the downstream flow path is defined by a tubular wall extending downstream from the valve seat; a check valve element provided to be displaceable upstream and downstream in the downstream flow path; an urging member provided to press the check valve element against the valve seat with a pre-closing urging force applied thereto toward an upstream side; and a sliding resistance imparting member; the check valve element comprising: wherein the urging member is provided over the urging member support portion of the check valve element to urge the sliding resistance imparting member upstream, thereby causing the sliding resistance imparting member to increase in outer diameter while being arrested by the arresting portion; the urging member having: wherein the engaging member is provided over the outer peripheral surface of the check valve element displaceably toward the upstream side and has a projection on an inner peripheral surface thereof slidable along the outer peripheral surface of the check valve element; wherein the check valve element has a recess on the outer peripheral surface, the recess longitudinally displaceably receiving the projection of the engaging member, the recess having a front end edge for stopping forward displacement of the engaging member by engagement of the projection with the front end edge.