Patent ID: 7051991
Filing Date: 2006-05-30
Classification: F16K

Abstract:
1. A proportional control valve for controlling a flow rate of a fluid to be at a desired level, said proportional control valve comprising: a base including an inlet and an outlet for a fluid, a fluid flow path extending from the inlet to the outlet and an orifice formed in a part of the fluid flow path, a valve seat provided in the orifice; a diaphragm acting as a valve head relative to said valve seat with one surface thereof being adapted to abut against said valve seat; first and second actuator members being operable by a solenoid to thereby cause displacement of said diaphragm, said first actuating member being adapted to abut against a surface of said diaphragm on a side opposite to said valve seat, said first actuator member comprising a hollow cylindrical body having one open end; said second actuator member comprising a solid cylindrical body which is fitted into a hollow portion of said first actuator member; and a cylinder having cylinder portions of different cross-sectional areas, said cylinder being sealed with said first and second actuator members which are displaceably fitted in opposite ends of said cylinder, a fluid filled in a space between said first actuator member and said second actuator member, said first actuator member and said second actuator member being adapted to move in opposite directions such that when said first actuator member is pressed downward, said second actuator member is pressed upward by means of the fluid.