Pressure control valve

A pressure control valve for controlling a pressure of a fluid in accordance with a temperature of the fluid, the pressure control valve comprising:

• a main body that has a valve port and a fluid chamber in which the fluid passes;
• a valve body that is movably installed in the main body to open and close the valve port;
• and
• a temperature sensing portion that is installed on the main body, and provided with a generally film-shaped diaphragm and a cap member, a peripheral portion of the diaphragm being fixed to a peripheral portion of the cap member so that a first surface of the diaphragm and a first surface of the cap member define a sealed space in which a gas is airtightly filled, a second surface of the diaphragm opposite to the first surface of the diaphragm being fixed to one end of the valve body, and the second surface of the diaphragm being subjected to the fluid in the fluid chamber so that a change of temperature of the fluid changes a volume of the gas in the sealed space to displace the diaphragm and the valve body to open and close the valve port;
• and
• a reinforcement member that is in direction contact with a second surface of the cap member opposite to the first surface of the cap member and fastened to the main body to prevent the change of the volume of the gas in the sealed space from breaking a fixture of the peripheral portion of the cap member to the peripheral portion of the diaphragm.