Document Type and Number:
Japanese Patent JPS5239996
Kind Code:
B1
Abstract:
A piloted low to high pressure analog interface valve device is provided having a gain factor determined by the area relationship of a diaphragm piston subject to a differential control force and a bellows connected to the piston and subject to delivery pressure acting in a direction opposite to the control force. A two-way, metering-type supply valve controlled by movement of the piston/bellows assembly is adapted to control the supply of fluid pressure to delivery. A bleed port continuously vents delivery chamber pressure which is established at a value determined by the valve gain factor and which is maintained against the bleed by metering action of the supply valve when the piston/bellows assembly stabilizes at some intermediate position as determined by the point at which the rate of supply pressure being metered to the delivery is able to precisely match the rate of bleed. The interface valve is also adapted to be driven by the differential outputs of a pure fluid proportional amplifier to further increase the overall gain of the interface. Valve performance may be improved at the expense of gain through a feedback signal corresponding to delivery pressure connected to oppose the control signal at the fluid amplifier.
Application Number:
JP1695771A
Publication Date:
October 08, 1977
Filing Date:
March 25, 1971
Export Citation:
International Classes:
F15B3/00; F15B9/08; F15C1/14; (IPC1-7): F15B5/00