Patent attributes
The present invention discloses a pressure control valve comprising: a cylindrical valve body which has a bottom wall and a side wall, wherein the bottom wall is provided thereon with an air inlet communicating with a device whose pressure to be limited, the side wall is provided with at least one guiding pin, and the cylindrical valve body has air outlets communicating with an exhausting system; a valve core, which is provided within the cylindrical valve body and in air-tight cooperation with the air inlet; a traveling guiding bar, having a lower end connected to the valve core; a covering fitted rotatably or up-and-down movably over the cylindrical valve body, for driving the traveling guiding bar to rotate or move up-and-down; a spiral guiding member, which is fitted up-and-down movably over the traveling guiding bar and is provided on its outer surface with spiral grooves into which the at least one guiding pin can be inserted; a pressure spring, having one end pressed against the valve core and the other end standing against the spiral guiding member.
