Patent ID: 8016263

Claim:
A stand alone pressure relief valve for limiting pressure in a vessel to which the valve is attached comprising: a sleeve structure which defines a passage, a sleeve outlet port provided in the sleeve structure, an ejector configured to slidably fit in the passage of the sleeve structure and having means to seal the passage, a closed end, an open end, a hollow interior, and an ejector outlet port which may be aligned with the sleeve outlet port so as to release pressure from within the hollow interior of the ejector, the ejector having a wall that expands outward diametrically to more tightly engage the sleeve structure when pressure is exerted on the interior of the ejector, and said ejector constructed of a slightly deformable material so that a wall of the ejector can expand outward diametrically to more tightly grip the interior surface of the sleeve structure when pressure is exerted on the hollow interior of the ejector thereby increasing frictional resistance to longitudinal movement of the ejector within the sleeve structure and so that an exterior surface of the ejector can deform inwardly to release from the interior surface of the sleeve structure when sufficient pressure is exerted on the hollow interior of the ejector so that frictional resistance to longitudinal movement of the ejector within the sleeve structure is overcome.