Patent ID: 6481689
Filing Date: 2002-11-19
Classification: F15B,F16K,Y10T

Abstract:
A two-way fluid control valve that controls a flow of a fluid, comprising:a housing that has a first connection port, a second connection port, and a valve port having a first side and an opposing second side; a transfer tube having a first end and an opposing second end, the transfer tube extending through the valve port with the first end extending from the first side; exactly one valve coupled to the transfer tube between the opposing ends, the valve located adjacent to the second side of the valve port; an electrical solenoid that acts on the first end of the transfer tube to move the transfer tube from a first position to a second position and move the valve away from the valve port thereby opening the valve port to allow fluid communication between the first connection port and the second connection port, the electrical solenoid being adapted to selectively have a residual magnetism that retains the transfer tube in the second position when current is not being provided to the electrical solenoid; a second actuator that moves the transfer tube from the second position to the first position to move the valve into contact with the valve port and close the valve port to prevent fluid communication between the first connection port and the second connection port; a first diaphragm coupled to the first end of the transfer tube, the first diaphragm having an effective area that is in fluid communication with the fluid and is approximately equal to the area of the valve port; and, a second diaphragm coupled to the second end of the transfer tube, the second diaphragm having an effective area that is in fluid communication with the fluid and is approximately equal to the area of the valve port, the first diaphragm and the second diaphragm dynamically balancing the force exerted by the fluid.