| 摘要 |
A fluid pressure flare relief valve is formed by a valve body having axially aligned inlet and outlet tubular ends forming a passageway adapted to be interposed in a fluid line. The valve body is circumferentially enlarged and provided with a lateral opening normally closed by a double-wall valve head forming a valve head chamber. The enlarged valve body portion contains a box-like chamber integral with the downstream end portion of the valve for communication therewith and normally closing the valve passageway. The chamber forming box member is line drilled to form a pair of apertures normally closed by a pair of pistons mounted on a piston rod. One end of the rod extends outwardly through the valve head. A small diameter piston contained by a cylinder projecting into the valve head surrounds the piston rod and is connected therewith for supporting one end of a pressure release pin having its other end supported by a pin cage. Fluid pressure against the small piston and one of the pair of pistons unbalances the other piston for movement of the rod toward the pressure release pin which collapses and opens the valve passageway when a predetermined pressure is in the upstream end portion of the valve.
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