Pressure relief valve

Details Pressure relief valve Pressure relief valve

1985-10-21

1987-03-31

Weakley, Harold W.

Fluid handling

With cleaner, lubrication added to fluid or liquid sealing...

Cleaning or steam sterilizing

137494, 137509, 137529, 1374545, F16K 336

Patent

active

046535276

ABSTRACT:
A pressure relief valve is disclosed. The pressure relief valve comprises a valve housing including fluid passageways, a poppet valve disposed within the housing, a piston disposed within the housing, and spring means disposed intermediate the piston and the poppet valve for biasly urging apart the piston and the poppet valve. The poppet valve has a valve seat which, together with a portion of the housing, defines a variable valve area. The piston has a piston area, relatively greater than the variable valve area, for modulating flow through, and pressure drop across, the poppet valve. The pressure relief valve preferably includes an orifice disposed within the housing for selectively controlling flow of hydraulic fluid through the housing passageways to the piston. The housing preferably includes an elongated cage within which the poppet valve is longitudinally slidable.

REFERENCES:
patent: 1971186 (1934-08-01), Kornas
patent: 2642892 (1953-06-01), Simons
patent: 2897836 (1959-08-01), Dinning et al.
patent: 3217742 (1965-11-01), Merrill
patent: 3529624 (1970-09-01), Cryder
patent: 3886969 (1975-06-01), Shira

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