公开(公告)号：US10435999B2

公开(公告)日：2019-10-08

申请号：US15167260

申请日：2016-05-27

Applicant: FLOW CONTROL LLC.

Inventor： Joel A. Kenney ,  Robert W. King

IPC: E21B34/08 ,  E21B43/12 ,  F16K15/02 ,  F16K15/04 ,  F16K17/04 ,  F16K17/26

Abstract: A fluid release valve includes valve housing (VH) coupled between a pump and an outlet pipe, VH chamber providing fluid from its inlet and outlet when the pump starts, and fluid release orifice (FRO) draining outlet pipe fluid flowing back into the VH when the pump stops; and check valve (CV) combination having a CV shuttle that moves towards/away from the inlet/outlet and an internal shuttle chamber (ISC), and having a CV that moves towards/away from the inlet/outlet within the ISC. The CV combination responds to a pumped fluid pressure when the pump's pumping and stops the fluid from flowing from the inlet around the CV shuttle and out the FRO. The CV combination responds to a fluid differential pressure (FDP) when the pump stops and allows the outlet pipe fluid to drain out the FRO until the FDP reaches an equilibrium.