Patent ID: 6234202
Filing Date: 2001-05-22
Classification: F15B,F16K,Y10T

Abstract:
A fluid control valve that controls a flow of a working fluid, comprising:a housing that has a first connection port and a second connection port, said housing further having a first valve port and a second valve port;a transfer tube that extends through said housing;a first valve that is attached to said transfer tube and located adjacent to said first valve port;a second valve that is attached to said transfer tube and located adjacent to said second valve port;a spring that is coupled to said first valve and said second valve to bias said first and second valves in an outward direction;a solenoid that moves said transfer tube from a first position to a second position such that said first valve closes said first valve port and said second valve port is open;a return spring that moves said transfer tube from the second position to the first position such that said second valve closes said second valve port and said first valve port is open to allow fluid communication between said first connection port and said second connection port;a first seal that is attached to said transfer tube and which seals said return spring, said first seal having an effective area, that is in fluid communication with the working fluid, and is approximately equal to said area of said first valve port; and,a second seal that is attached to said transfer tube and which seals said solenoid, said second seal having an effective area, that is in fluid communication with the working fluid, and is approximately equal to said area of said second valve port.