Pressure Reducing Valve And Regulator For Gas

Abstract

A regulator for gas having a diaphragm rod held at the center of a diaphragm of which rim is sandwiched between a body and a cover via diaphragm retainers, and a valve element capable of seating itself at a valve seat fixedly placed in the body with a valve hole opening at the center provided in an intermediate portion of a valve axis having its one end detachably coupled to the diaphragm rod and its other end slidably fitted in a guide opening provided on the body side, wherein the body ( 34 ) is equipped with a valve action unit ( 120 ) formed by assembling in advance a valve seat member ( 100 ) having a valve hole ( 111 ) and the valve seat ( 112 ) provided thereon, a guide member ( 106 ) having a guide opening ( 105 ) and pressed into the valve seat member ( 100 ), and a valve axis ( 114 ) having a valve element ( 113 ) provided thereon in a state of having one end of the valve axis ( 114 ) projected from the valve hole ( 111 ) and the other end of the valve axis ( 114 ) slidably fitted into the guide opening ( 105 ). It is thereby possible to reduce machining cost and improve assembly conformance.

1 . A pressure reducing valve comprising a valve housing ( 90 ) made by combining a body ( 34 ) and a cover ( 91 ), a diaphragm ( 93 ) of which rim is sandwiched between the body ( 34 ) and the cover ( 91 ), a diaphragm rod ( 128 ) held at the center of the diaphragm ( 93 ) via diaphragm retainers ( 125 ,  127 ), a valve axis ( 114 ) having one end thereof detachably coupled to the diaphragm rod ( 128 ) and the other end slidably fitted into a guide opening ( 105 ) provided on the body ( 34 ) side, and a valve element ( 113 ) provided in an intermediate portion of the valve axis ( 114 ) and capable of being seated at a valve seat ( 112 ) fixedly placed in the body ( 34 ) and opening a valve hole ( 111 ) for having the valve axis ( 114 ) movably inserted therein at the center, characterized in that a valve action unit ( 120 ) is mounted to the body ( 34 ) in a state of having one end of the valve axis ( 114 ) projected from the valve hole ( 111 ) and the other end of the valve axis ( 114 ) slidably fitted into the guide opening ( 105 ), the valve action unit being formed by assembling in advance a valve seat member ( 100 ) having the valve hole ( 111 ) and the valve seat ( 112 ) provided thereon, a guide member ( 106 ) having the guide opening ( 105 ) and pressed into the valve seat member ( 100 ), and the valve axis ( 114 ) on which the valve element ( 113 ) is provided. 
   
   
       2 . The pressure reducing valve according to  claim 1 , wherein a fitting concave portion ( 135 ) for swingably fitting a voluminous portion ( 114   a ) provided at one end of the valve axis ( 114 ) is coaxially provided at the end of the valve axis ( 114 ) side of the diaphragm rod ( 128 ), and a clip member ( 137 ) engaged with the voluminous portion ( 114   a ) from the valve seat member ( 100 ) side is detachably inserted into a slit ( 136 ) provided on the diaphragm rod ( 128 ) along a plane orthogonal to an axis line of the diaphragm rod ( 128 ). 
   
   
       3 . The pressure reducing valve according to  claim 1 , wherein the body ( 34 ) has a concave portion ( 94 ) facing the diaphragm ( 93 ) side provided thereon, and a bulkhead member ( 96 ) has the valve axis ( 114 ) penetrate airtightly and movably, and partitions a pressure action chamber ( 121 ) facing a face of the diaphragm ( 93 ) and a decompression chamber ( 101 ) for generating a gas pressure acting on the pressure action chamber ( 121 ) and thereby penetrating the valve hole ( 111 ), the bulkhead member ( 96 ) being made by press-stamping a sheet iron and fixed on the body ( 34 ) in the state of fitting into the concave portion ( 94 ). 
   
   
       4 . The pressure reducing valve according to  claim 3 , wherein the bulkhead member ( 96 ) is fixed on the body ( 34 ) with a bolt ( 98 ) having a diameter expansion head ( 98   a ) for regulating a deflection to the pressure action chamber ( 121 ) side of the diaphragm ( 93 ) by contacting a plane on the pressure action chamber ( 121 ) side of the diaphragm ( 93 ). 
   
   
       5 . The pressure reducing valve according to  claim 3 , wherein the bulkhead member ( 96 ) has a continuous hole ( 166 ) leading to the pressure action chamber ( 121 ) provided in a portion contacting an inner surface of the concave portion ( 94 ), the body ( 34 ) has an outlet passage ( 164 ) leading to the decompression chamber ( 101 ) provided thereon, and an aspirator passage ( 167 ) provided on the body ( 34 ) with one end thereof leading to the continuous hole ( 166 ) has the other end communicating with the outlet passage ( 164 ). 
   
   
       6 . The pressure reducing valve according to  claim 5 , wherein the other end of the aspirator passage ( 167 ) is connected to an aspirator tube ( 168 ) mounted on the body ( 34 ) with an opening toward a downstream side of a gas flow direction inside the outlet passage ( 164 ). 
   
   
       7 . A regulator for gas including the pressure reducing valve according to  claim 1 , wherein at least an electromagnetic isolation valve ( 36 ) and the pressure reducing valve ( 37 ) are provided on the body ( 34 ) on which an inlet passage ( 59 ) and the outlet passage ( 164 ) are provided so as to intervene between the inlet passage ( 59 ) and the outlet passage ( 164 ), and an oil filter ( 38 ) mounted between the pressure reducing valve ( 37 ) and the outlet passage ( 164 ) is placed on the body ( 34 ). 
   
   
       8 . The regulator for gas according to  claim 7 , wherein the body ( 34 ) has amounting concave portion ( 148 ) provided thereon, and the oil filter ( 38 ) having one end thereof inserted into the mounting concave portion ( 148 ) is sandwiched between the body ( 34 ) and a filter cover ( 42 ) detachably mounted on the body ( 34 ) by covering a projection of the oil filter ( 38 ) from the body ( 34 ). 
   
   
       9 . The regulator for gas according to  claim 8 , wherein the oil filter ( 38 ) has a mesh portion ( 153 ) for allowing a gas flow in a part of a side wall of a cylindrical filter case ( 152 ) made of a synthetic resin, the body ( 34 ) has a catching hole ( 151 ) opening at a closed end of the mounting concave portion ( 148 ) provided thereon to lead to a gas passage ( 150 ) provided on the body ( 34 ) so as to lead a gas pressure-reduced by the pressure reducing valve ( 37 ), an elastic member ( 154 ) has integrally a cylinder ( 154   a ) for fitting the one end into the catching hole ( 151 ) elastically and a collar portion ( 154   b ) jutting outward from the cylinder ( 154   a ) by being sandwiched between one end of the filter case ( 152 ) and the closed end of the mounting concave portion ( 148 ) mounted thereon, the elastic member ( 154 ) being mounted to one end of the filter case ( 152 ) to have the cylinder ( 154   a ) lead to the inside of the filter case ( 152 ), and an oil storage chamber ( 156 ) for storing the oil oozing from the mesh portion ( 153 ) of the oil filter ( 38 ) is formed around the oil filter ( 38 ) in the filter cover ( 42 ) so as to have an upper end of the oil storage chamber ( 156 ) lead to the outlet passage ( 164 ). 
   
   
       10 . The regulator for gas according to  claim 8 , wherein a drain hole ( 157 ) liquid-tightly closed by a drain bolt ( 159 ) is provided at the bottom of the filter cover ( 42 ). 
   
   
       11 . The regulator for gas according to any one of  claims 8  to  10 , wherein a relief valve ( 39 ) is mounted on the filter cover ( 42 ). 
   
   
       12 . The regulator for gas according to  claim 9 , wherein the filter cover ( 42 ) is mounted on an undersurface ( 34   b ) of the body ( 34 ), a part of the pressure reducing valve ( 37 ) is mounted on the body ( 34 ) from a topside ( 34   a ) of the body ( 34 ), and a back-pressure hole ( 160 ) for exerting a back pressure on the pressure reducing valve ( 37 ) is provided on the body ( 34 ) while leading to the oil storage chamber ( 156 ).