Check valve

Patent metadata

Field	Value
Publication number	US-10436334-B2
Application number	US-201715595046-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	Nov 17, 2014
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A check valve includes a plate-shaped valve seat member provided with a fluid discharge port, a plate-shaped valve member provided on a downstream side of the valve seat member and configured to open/close the discharge port, a coil spring provided on a downstream side of the valve member and configured to bias the valve member toward the discharge port, a spring receiving member provided for the coil spring on a downstream side thereof, and a plurality of guide rods provided at the periphery of the valve member and formed to extend in an upstream-to-downstream flow direction, each having a downstream end portion attached to the spring receiving member, and configured to guide the valve member in the upstream-to-downstream flow direction.

First claim

What is claimed:

1. A check valve comprising:
a valve seat member provided with a fluid circulation port;
a round plate-shaped valve member provided on a downstream side of the valve seat member and configured to open/close the circulation port;
a spring provided on a downstream side of the valve member and configured to bias the valve member toward the circulation port;
a spring receiving member provided for the spring on a downstream side thereof; and
a plurality of round guide rods
provided at a periphery of the valve member and formed to extend in an upstream-to-downstream flow direction,
each having a downstream end portion attached to the spring receiving member, and
each being in contact with an outer circumferential surface of the valve member to thereby guide the valve member in the upstream-to-downstream flow direction,

wherein an upstream end portion of each guide rod is inserted into a periphery of the circulation port of the valve seat member and attached to a screw hole of an insertion member,
the spring receiving member is fixed with nuts with a lower end portion of each guide rod being inserted into the spring receiving member,
the spring receiving member has a recess which is formed at a center of the spring receiving member and into which a downstream end portion of the spring is inserted,
a bottom wall of the recess is provided with a plurality of openings forming a fluid circulation path,
a threadedly-engagement member is directly threadedly engaged with an outer periphery of a discharge pipe, and
the insertion member is inserted into the discharge pipe and fixed to the threadedly-engagement member with bolts.

Assignees

• Tlv Co Ltd

Inventors

• Hirotani Masahisa

Classifications

• E03C1/288

  having non-return valves against return of waste water (E03C1/286 takes precedence) · CPC title

• F16K15/18

  with actuating mechanism; Combined check valves and actuated valves · CPC title

• F16K15/028

  the valve member consisting only of a predominantly disc-shaped flat element · CPC title

• F16K15/16

  with tongue-shaped laminae · CPC title

• F04B39/10

  Adaptations or arrangements of distribution members · CPC title