Improvements in apparatus for limiting pressure of fluids

Abstract

Abstract 392,396. Pressure-relief valves. PETIT, A., 5, Rue du Sahel, Paris. Aug. 22, 1932, No. 23429. [Class 135.] A relief valve 3, Fig. 2, is held to its seat by fluid pressure in a chamber 26 above a piston 5 on the valve spindle 4, fluid being admitted to the chamber 26 through a controlled orifice 27. When the allowable pressure in the pipe 1 is attained, a piston 29 lifts against the action of a spring 35 and a passage 37 in the spindle 31 makes communication between the chamber 26 and an exhaust pipe 2, with the result that the main valve 3 lifts. The valve 3 may be raised when desired by operating a screwed stem 40. The auxiliary piston 29 may be isolated from the main valve 3 by the introduction of a partition 42 and pipe 43. In a modification, the main valve 3, Fig. 1, is loaded by a spring 8, and pressure fluid is led to both sides of the piston 5. An auxiliary valve 13 has a stem engaging the piston 5. In operation, when the main valve 3 starts to lift, the auxiliary valve 13 opens and a pipe 22 establishes communication between the piston space 21 and the exhaust pipe 2, with the result that an added lift is given to the valve 3.

Inventors

No inventors recorded.

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