초록 ▼

A pressure relief valve for releasing fluid through a vent in a railway tank car, tank trucks and similar vessels. A valve disk is normally biased in a closed position by a plurality of constant-force springs of laminated steel tapes on drums supported on upright angle brackets symmetrically arrange

A pressure relief valve for releasing fluid through a vent in a railway tank car, tank trucks and similar vessels. A valve disk is normally biased in a closed position by a plurality of constant-force springs of laminated steel tapes on drums supported on upright angle brackets symmetrically arranged around a valve seat. The pressure at which the valve opens is determined by a preselection of the number of springs, laminated tapes per spring, and the restoring force of each tape.

대표청구항 ▼

[ I claim:] [1.] A valve assembly for releasing fluid through a vent opening in a storage tank above a predetermined pressure comprising in combination:a valve seat adapted to be mounted on the tank for communicating with the vent opening;a valve disk reciprocal relative to said valve seat for openi

[ I claim:] [1.] A valve assembly for releasing fluid through a vent opening in a storage tank above a predetermined pressure comprising in combination:a valve seat adapted to be mounted on the tank for communicating with the vent opening;a valve disk reciprocal relative to said valve seat for opening and closing the vent opening;a plurality of angle brackets fixed uprightly and symmetrically around said valve seat in close proximity to said valve disk, adjacent ones of said brackets having parallel mutually facing sides;a plate connected to said valve disk movable with said valve disk along the length of said brackets;at least one constant-force spring means having a proximal end rotatably mounted between each of said facing sides on an axis perpendicular thereto, and a distal end connected to said plate for urging said valve disk to a closed position.