公开(公告)号：US10352479B2

公开(公告)日：2019-07-16

申请号：US15309020

申请日：2014-09-11

Applicant: Flowtech Co., Ltd. ,  Jae Gu Yang

Inventor： Jae Gu Yang ,  Jai Youl Yang ,  Jae Wook Oh ,  Ji Suk Yang

IPC: F16K15/03 ,  F16K47/02

Abstract: The present invention relates generally to a parallel cylinder-type check valve and, more particularly, to a parallel cylinder-type check valve in which two shock-absorbing dampers are connected in parallel to each other so as to absorb shock when a valve is closed, wherein the length of a rocker arm connected to any one shock-absorbing damper is adjusted to be longer according to the principle of a lever in order to provide a sufficient shock-absorbing effect. Also, the present invention relates to a parallel cylinder-type check valve, which is rapidly closed at a high speed at the time of the initial closing of the valve and is slowly closed at a low speed at the later closing of the valve by means of the parallel cylinder, thereby preventing noise and vibration, as well as preventing water hammer.