Pressure relief valve

Abstract

A pressure relief valve includes a first port configured to receive a first gas at an input pressure, a second port configured to receive a second gas at a regulating pressure and a third port in fluid communication with the first port via an orifice and configured to output the first gas at an output pressure. The valve also includes a piston movable along an axis and configured to control the passage of gas through the orifice between the first port and the second port, such that the output pressure of the gas is dependent on the axial position of the piston, a resilient member configured to bias the piston. and a chamber at least partly defined by the piston and in fluid communication with the second port, such that the force exerted by the gas within the chamber on the piston acts against the action of the resilient member.

Dependencies are inferred from the claim text.