Pressure reducing valve for gas

A pressure reducing valve for gas comprising

• a high pressure chamber that is formed within a body,
• a valve body that is housed within the high pressure chamber,
• a valve seat that can be seated on the valve body,
• a passage that has one end opening in the high pressure chamber at the valve seat and communicates with an injector on the other end side, and
• a piston that is joined to the valve body, is housed in a piston chamber defined within the body, and partitions the piston chamber into a spring chamber on the high pressure chamber side and a pressure action chamber on a side opposite to the high pressure chamber,
• the valve seat having the high pressure chamber adjacent to an outer side thereof and the passage adjacent to an inner side thereof,
• a connecting passage being formed within the valve body, the connecting passage providing a connection between the passage and the pressure action chamber,
• a guide hole being formed within the body, the guide hole opening in the high pressure chamber so as to be coaxial with the passage, providing a connection between the high pressure chamber and the spring chamber, and guiding movement of the valve body between the spring chamber and the high pressure chamber,
• a spring being provided within the spring chamber, the spring being linked to the piston and urging the valve body in an opening direction, and
• a seal member being disposed between the guide hole and the valve body, the seal member providing a seal between the high pressure chamber and the spring chamber.