Patent ID: 8181668

Claim:
A pressure reducing valve for gas in which a valve mechanism ( 20 ) having opening in a central part thereof a valve hole ( 68 ) that communicates with a low pressure passage ( 85 , 86 , 94 , 119 ) and a low pressure chamber ( 83 , 84 , 116 ) and comprising a valve body ( 59 ) that is capable of being seated on a valve seat ( 58 ) facing a valve chamber ( 66 ) communicating with a high pressure passage ( 27 , 28 , 30 , 64 ) is housed within a body ( 16 , 16 ′) such that the valve body ( 59 ) is connected to a pressure receiving member ( 115 ) operating in response to pressure of the low pressure passage ( 85 , 86 , 94 , 119 ) and the low pressure chamber ( 83 , 84 , 116 ), characterized in that the body ( 16 , 16 ′) is formed by joining two, that is, first and second body members ( 18 , 19 ; 18 ′, 19 ′) having different strengths, the body ( 16 , 16 ′) being formed by joining the second body member ( 19 , 19 ′), which has a low strength, and the first body member ( 18 , 18 ′), which has a high strength and has an insertion hole ( 25 ) coaxially housing the valve mechanism ( 20 ), so that the second body member ( 19 , 19 ′) and the first body member ( 18 , 18 ′) overlap each other in a direction along an axis of the valve body ( 59 ) while forming therebetween a pressure reduction chamber ( 83 ), which is the low pressure chamber, and a circular cross-section fitting projection ( 18 a ) projectingly provided integrally with the first body member ( 18 , 18 ′) so as to be coaxial with the insertion hole ( 25 ) is hermetically fitted into the second body member ( 19 , 19 ′).