Gas pressure-reducing valve

A gas pressure-reducing valve comprising:

• a pressure-reducing chamber for generating a gas pressure that acts on one surface of a diaphragm, the pressure-reducing chamber being formed within a valve housing that clamps the peripheral edge of the diaphragm;
• a valve body that can sit on a valve seat having in its central part a valve hole communicating with the pressure-reducing chamber;
• a valve stem penetrating the valve hole in an axially movable manner, wherein one end of the valve stem is connected to the central part of the diaphragm and the other end of the valve stem is fixed to the valve body;
• and
• a spring biasing the diaphragm in a direction that detaches the valve body from the valve seat, the spring being housed in a spring chamber formed within the valve housing and the spring chamber facing the other surface of the diaphragm;
• wherein the valve housing is formed by conjoining a body, a partition, and a cover, the body being provided with the valve seat, the partition forming the pressure-reducing chamber between itself and the body and forming a pressure action chamber between itself and one surface of the diaphragm, and the cover forming the spring chamber between itself and the other surface of the diaphragm and clamping the peripheral edge of the diaphragm between itself and the partition;
• and
• wherein the partition has a through hole for allowing the valve stem to run through in an airtight and axially slidable manner and a communicating hole for providing communication between the pressure action chamber and the pressure-reducing chamber.