Valve for developing variable output pressure

摘要

A valve is disclosed which receives a fluid such as gas at an input port and varies the fluid pressure at the output port in response to an electrical control signal. In one embodiment, a magnet-coil combination responds linearly to a control current to vary the bias on a fluid restriction device to thereby modify the pressure of the fluid at the outlet. In another embodiment, a flexible bellows transmits the force generated by the magnet-coil combination to the fluid restriction device.