Patent ID: 8609293

Claim:
A valve, comprising: a housing with a cavity formed therein, the housing further including a rod aperture and a pair of fluid flow ports formed therein and communicating with the cavity; an actuator disposed adjacent the housing; a piston having a rod coupled to piston head, the piston head disposed in the cavity of the housing, the rod disposed through the rod aperture and operatively coupled to the actuator; and a ring seal disposed in the cavity and circumscribing the rod of the piston, the ring seal disposed between the piston head and an inner surface of the housing, the ring seal continuously housing, wherein the ring seal biases the piston head toward one of the fluid flow ports formed in the housing causing the piston head to seal the one of the fluid flow ports to close the calve when the actuator is deactivated, and wherein the ring seal is elastically deformed into a further compressed state causing each of the fluid flow ports to be unsealed to open the valve when the actuator is activated; wherein the valve does not include a biasing spring.