Abstract: Pressure relief valve including an annular nut of relatively high thermal conductivity including a first end portion providing an inwardly extending axial cylindrical surface and an internal annular surface extending radially outwardly from the cylindrical surface and including an internally threaded second end portion, and a fusible disc including a cylindrical first end portion provided with frictional enhancement means in frictional engagement with the cylindrical surface to mount the fusible disc frictionally in the annular nut and including an annular second end portion engaging the annular surface to position the fusible disc in the annular nut.

Abstract: Apparatus for venting a container containing a fluid and including a poppet mounted to the bottom of a cap or flap mounted to a housing for being mounted to the container, a fastener for fastening the cap of flap to the housing and which fastener may be a fusible fastener for unfastening the cap or flap and for venting the container to the atmosphere upon heat applied externally to the container reaching a predetermined temperature. The poppet venting the container to the atmosphere upon the pressure in the container reaching a predetermined pressure and the poppet may be a combination poppet for venting the container to the atmosphere upon pressure in the container reaching a predetermined pressure and for venting the container to the atmosphere upon a vacuum in the container reaching a predetermined vacuum.

Abstract: Apparatus for venting a container containing a fluid and including a poppet mounted to the bottom of a cap or flap mounted to a housing for being mounted to the container, a fastener for fastening the cap of flap to the housing and which fastener may be a fusible fastener for unfastening the cap or flap and for venting the container to the atmosphere upon heat applied externally to the container reaching a predetermined temperature. The poppet venting the container to the atmosphere upon the pressure in the container reaching a predetermined pressure and the poppet may be a combination poppet for venting the container to the atmosphere upon pressure in the container reaching a predetermined pressure and for venting the container to the atmosphere upon a vacuum in the container reaching a predetermined vacuum.

Abstract: A pressure relief vent for a pressure vessel such as an over the road tank trailer including a poppet forced into sealing engagement with a valve seat by a compression spring which maintains the poppet in sealing engagement with the valve seat to a set pressure and which poppet upon the occurrence of pressurized fluid in the trailer tank sufficiently in excess of the set pressure lifts the poppet up off of the valve seat a distance sufficient to permit the over-pressurized fluid to flow out of the vent at the flow rate, the outer peripheral portion of the poppet is provided with outwardly curved and downwardly extending portions which form the escaping over-pressurized fluid into a jet stream which provides reaction force which assists the pressurized fluid in maintaining the poppet lifted off of the valve seat to provide the flow rate and which permits the use of a stiffer and therefore shorter compression spring enabling the pressure relief vent to be shorter in height while maintaining the required flow ra