Pressure reducing valve and regulator for gas

A method of assembling a pressure reducing valve, wherein the pressure reducing valve comprises a valve housing made by combining a body and a cover, a diaphragm of which a rim is sandwiched between the body and the cover, a diaphragm rod held at the center of the diaphragm via diaphragm retainers, a valve shaft having one end thereof coupled to the diaphragm rod and the other end slidably fitted into a guide opening provided on the body side, the guide opening being in open communication with an oil storage chamber via a back-pressure hole defined in the body, and a valve element provided in an intermediate portion of the valve shaft and capable of being seated at a valve seat fixedly placed in the body and opening a valve hole for having the valve shaft movably inserted therein at the center, the method comprising the steps of:

• pressing a guide member, having the guide opening, into a valve seat member having the valve hole and the valve seat provided thereon,
• assembling the valve seat member with the guide member and the valve shaft into a valve action unit while having one end of the valve shaft projected from the valve hole and the other end of the valve shaft slidably fitted into the guide opening, and
• mounting said valve action unit to the body,
• wherein the pressure reducing valve is provided in a regulator for gas, and the regulator comprises an oil filter which is arranged between the body and a filter cover mounted to the body, the filter cover covering the oil filter, wherein the oil filter comprises a cylindrical filter case allowing a gas to flow, a gas passage is defined in the body in communication with an inside of the filter case so as to guide a gas which has been pressure-reduced by the pressure reducing valve, and the oil storage chamber is defined around the oil filter to store oil oozing from a mesh portion of the oil filter.