Patent ID: 8613292

Claim:
A decompression switching valve having one valve hole that penetrates in a direction of an axis, air supply ports, a first output port, a second output port, and an air exhaust port, the ports communicating with the valve hole, the decompression valve comprising: a main valve body having a first end and a second end with respect to the direction of the axis; a first spool slidably provided on a side of the first end in the valve hole in the direction of the axis; a second spool slidably provided on a side of the second end adjacent to the first spool in the valve hole in the direction of the axis; and a spool driving section that presses the first spool to slide toward the second end, and thereby switches location of the first spool from a first switching position on the side of the first end to a second switching position on the side of the second end, wherein a switching valve section formed by the first spool and the spool driving section connects the first output port to the air exhaust port when the first spool is located at the first switching position, and the switching valve section connects the first output port to the air supply port when the first spool is driven by the spool driving section and is thereby located at the second switching position, and wherein a decompression valve section formed by the second spool connects the second output port to the air supply port, decompresses compressed air having been supplied to the air supply port, and outputs the decompressed air from the second output port when the first spool is located at the first switching position, and the decompression valve section connects the second output port to the air exhaust port when the first spool is located at the second switching position, wherein the decompression valve section comprises an elastic member that applies an elastic applying force to the second spool toward the first end, and a pressure receiving surface that makes a pressure of the second output port act on the second spool in a direction opposite to the applying force, and wherein the second spool is reciprocally moved in the direction of the axis on the basis of a balance between the applying force of the elastic member and the pressure acting on the pressure-receiving surface, a cross-sectional area of a flow path that communicates from the air supply port to the second output port changes, and thereby the compressed air supplied to the air supply port is decompressed to a predetermined pressure based on the applying force to output from the second output port.