A gas pressure-reducing valve in which a valve member to be seated on a valve seat having a valve hole opened at its central portion and leading to a pressure-reducing chamber between a body and a diaphragm is fixed on a valve stem connected to the central portion of the diaphragm and arranged coaxially with the valve axis. A bottomed mounting bore which is aligned with the valve axis and opened toward the pressREDUCING VALVESure-reducing chamber is formed in the body. A cylindrical valve seat member forming a valve chamber between itself and the closed end of the mounting bore for accommodating the valve member and inserted into the mounting bore is fixed on the body. API Cast Steel ValvesA valve seat facing the valve chamber is formed on the inner surface of the end portion of the valve seat member on the side of the pressure-reducing chamber. This arrangement makes it possible to reduce the number of parts and to enhance the degree of freedom for the arrangement of the parts in the body. Instrumentation Ball Valves A gas pressure-reducing valve arrangement comprising a primary pressure-reducing valve and a secondary pressure-reducing valve, these valves being arranged in a common body and capable of reducing a gas pressure in a two-step manner, each of said primary and secondary pressure-reducing valves comprising a diaphragm having a peripheral edge portion between said body and a cover fastened to said body for constructing a valve housing together with said body, said diaphragm being spring-urged toward a side which reduces the capacity of a pressure-reducing chamber formed between said diaphragm and said body, in which a valve member that can be seated on a valve seat defining at a central portion an opened valve hole leading to said pressure-reducing chamber is fixed on a valve stem which is connected to the central portion of said diaphragm and arranged coaxially with said valve hole, wherein a bottomed mounting bore arranged coaxially with said valve stem and opened toward said pressure-reducing chamber is provided in said body, wherein a cylindrical valve seat member forming a valve chamber between itself and a closed end of said mounting bore for accommodating said valve member and inserted into said mounting bore is fixed on said body, wherein said valve seat facing said valve chamber is formed on an inner surface of an end portion of said valve seat member on the side of said pressure-reducing chamber, and wherein a passage for gas transfer between said primary and secondary reducing valves is formed in said body.

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