Patent ID: 6684904
Filing Date: 2004-02-03
Classification: F16K,Y10T

Abstract:
A variable pressure valve apparatus comprising: a control probe having first electromagnetic means for generating electric power; a variable pressure valve independent from the control probe and having a fluid inlet port, a fluid discharge port, and a valve element for undergoing movement to close the fluid inlet port; control means for controlling movement of the valve element to close the fluid inlet port and comprised of a spring member for biasing the valve element to close the fluid inlet port, rotation means for undergoing rotation to deform the spring member and thereby vary a biasing force applied to the valve element by the spring member, movable means for undergoing movement to rotate the rotation means, and an ultrasonic motor having a piezoelectric element for undergoing extension movement to move the movable means to thereby rotate the rotation means to deform the spring member; and second electromagnetic means supplied with electric power generated by the first electromagnetic means for supplying electric power to the control means to control movement of the valve element to close the fluid inlet port.