Patent ID: 8342201
Filing Date: 2013-01-01
Classification: G05D,Y10T

Abstract:
1. A pressure reducing valve comprising: a opening/closing valve which opens and closes a passage between a primary pressure chamber and a secondary pressure chamber; a diaphragm body which is displaced in accordance with fluctuations in pressure in said secondary pressure chamber; a valve hole through which said secondary pressure chamber is communicatively connected with the atmosphere; a relief valve which opens and closes said valve hole; a relief valve casing installed in a central part of said diaphragm body, said valve hole being formed in an upper part of said relief valve casing; a linkage member which links said opening/closing valve and said relief valve with each other so that said opening/closing valve and said relief valve perform valve opening/closing operations thereof in association with each other, wherein said linkage member includes wherein said opening/closing valve is provided on a lower end of said pintle, wherein said relief valve is positioned at an upper end of said pintle, wherein said valve hole has a common axis with the axes of said valve passage and said pintle hole, wherein said relief valve casing includes a piston portion supported by a cylinder portion of said valve guide to be slidable thereon, wherein a displacement of said diaphragm body causes said piston portion to move while sliding on said cylinder portion, and wherein said valve guide is made of resin and said pintle and said relief valve casing are made of metal.