Patent ID: 8586258

Claim:
A valve for a pressure vessel system, comprising: a housing including a cavity and a hollow fluid flow portion, the housing having a ventilation port and a pressure control port formed therein in fluid communication with the cavity and a pair of fluid flow ports formed in the hollow fluid flow portion; wherein the cavity is not in fluid communication with the hollow fluid flow portion during operation of the valve; a membrane actuator disposed in the cavity of the housing, the membrane actuator forming a substantially fluid-tight barrier that divides the cavity; a piston disposed in the cavity and the hollow fluid flow portion of the housing, the piston having a first end and a second end, the piston coupled at the first end to the membrane actuator in the cavity, and the second end having a piston head disposed in the hollow fluid flow portion; and a spring disposed in the hollow fluid flow portion of the housing, the spring biasing the piston head toward one of the fluid flow ports formed in the hollow fluid flow portion to seal the one of the fluid flow ports, wherein the sealed one of the fluid flow ports formed in the hollow fluid flow portion is opened by a pressurization of the cavity.