Patent ID: 8973610
Filing Date: 2015-03-10
Classification: F15B,F16K,Y10T

Abstract:
1. A pneumatic control system comprising: a first manual control valve comprising a gas inlet and a gas outlet communicating with the gas inlet; a second manual control valve comprising a gas inlet and a gas outlet communicating with the gas inlet; a pneumatic control valve comprising a first valve body, having the opposite ends of the first valve body respectively defining a first gas inlet and a receiving hole communicating with the first gas inlet; a fastening tube fastened in the receiving hole of the first valve body, the fastening tube axially forming a plurality of guiding ribs evenly positioned on the inner surface of the fastening tube, and each of the guiding ribs forming an inclined surface at a distal end thereof; a pushing block slidably received in one end of the fastening tube adjacent to the first gas inlet; a rotating block slidably received in the other end of the fastening tube; a second valve body connected to an end of the first valve body adjacent to the receiving hole of the first valve body; an end cover fastened on an end of the second valve body away from the first valve body; an elastic member; and a piston received in the second valve body with a first end of the piston resisting with the rotating block and a second end of the piston opposite to the first end fastened to the end cover via the elastic member, the pushing block axially defining a plurality of guiding grooves at the outer surface of the pushing block corresponding to the guiding ribs and forms a plurality of inclined surfaces between the guiding grooves at an end of the pushing block adjacent to the rotating block, and the rotating block axially defining a plurality of sliding grooves in the outer surface of the rotating block corresponding to the guiding ribs and defining a plurality of first spiral surfaces and a plurality of second spiral surfaces adjacent to the first spiral surfaces between the sliding grooves at an end of the rotating block adjacent to the pushing block; and