Check valve and braking system using the same

Patent metadata

Field	Value
Publication number	US-9227614-B2
Application number	US-201313754034-A
Country	US
Kind code	B2
Filing date	Jan 30, 2013
Priority date	Jan 31, 2012
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

In a check valve in which a valve part is disposed in a valve part accommodating recess movably relative to a piston part, among the valve part accommodating recess, an anti-valve seat side accommodation space formed between a surface of the valve part accommodating recess in an anti-valve seat side of the valve part and a wall surface of the valve part accommodating recess are communicated to exit side fluid passages.

First claim

What is claimed is:

1. A check valve comprising:
a case member having an entrance-side fluid passage where fluid flows in, an exit-side fluid passage where fluid flows out, and a valve seat disposed in a downstream end of the entrance-side fluid passage;
a pipeline disposed in a housing, the pipeline being separated into a downstream side pipeline of the check valve and an upstream side pipeline of the check valve by the case member;
a valve member that opens and closes a passage between the entrance-side fluid passage and the exit-side fluid passages by touching and separating from the valve seat, and is energized in a valve opening direction by a pressure of the fluid from the entrance-side fluid passage; and
a spring that energizes the valve member in a valve closing direction; wherein,
the check valve opens when the energization force in the valve opening direction due to the pressure exceeds the energization force in the valve closing direction due to the spring; wherein,
the valve member has a piston part that reciprocates, and a valve part that is disposed in the valve seat side and touches and separates to the valve seat;
the case member has a piston accommodation cylinder part that accommodates the piston part reciprocatably;
the piston part has a valve part accommodating recess that accommodates a part of the valve part;
the valve part is disposed in the valve part accommodating recess movably relative to the piston part, and is urged against a wall surface of the valve part accommodating recess by a pressure of the fluid from the entrance-side fluid passage;
among the valve part accommodating recess, an anti-valve seat side accommodation space formed between a surface in an anti-valve seat side of the valve part and a wall surface of the valve part accommodating recess communicates to the exit side fluid passage.
a damper chamber is formed by the valve member and the case member in an anti-valve seat side of the valve member, the damper chamber generates damping force;
the anti-valve seat side accommodation space communicates with the exit side fluid passage through a piston part communicating slot formed in the wall surface of the valve part accommodating recess;
the valve part accommodating recess has a tapered surface, and the valve part is contactable to the tapered surface,
the anti-valve seat side accommodation space is formed between the piston part and the valve part; and
the piston accommodation cylinder part is formed coaxially with the entrance-side fluid passage, and only a single through hole extending in a radial direction is formed in the piston accommodation cylinder part.

2. The check valve according to claim 1 , wherein;
the depth of the valve part accommodating recess is configured so that the valve part does not detach from the valve part accommodating recess when the piston part is positioned where most distant from the valve seat.

Assignees

• Denso Corp
• Advics Co Ltd

Inventors

• Kajita Hidenobu
• Omi Masaaki

Classifications

• B60T8/4872

  pump-back systems · CPC title

• F16K15/044

  spring-loaded · CPC title

• B60T13/143

  Master cylinder mechanically coupled with booster · CPC title

• B60T17/04 Primary

  Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L) · CPC title

• F16K27/0209

  Check valves or pivoted valves · CPC title