Pressure-limiting hydraulic valve

Details Pressure-limiting hydraulic valve Pressure-limiting hydraulic valve

1983-12-06

1985-11-12

Weakley, Harold W.

Fluid handling

Line condition change responsive valves

Line flow effect assisted

137494, 137538, 251 24, F16K 1734

Patent

active

045521727

ABSTRACT:
A pressure-limiting valve for hydraulic fluids comprises a stepped switching piston which is loaded by a closing spring to oppose high fluid pressure obtaining in an inflow duct of the valve. Radial transverse bores branch from an axially-extending bore in the switching piston. When the setting pressure established by the closing spring is exceeded, the transverse bores in the piston move past an O-ring seal as the piston compresses the spring, and pressure fluid thus flows from the axially-extending bore into a discharge duct of the valve. The stepped switching piston is guided in a pressure chamber by a portion of its cross-section which is greater than that in the zone of the O-ring seal. Adjacent the inflow duct, the axially-extending bore in the piston has a reduced flow cross-section. Further radial bores lead from the axially-extending bore in the piston in the region of the stepped portion of the latter.

REFERENCES:
patent: 2886058 (1959-05-01), Horton
patent: 2890714 (1959-06-01), Greenwood
patent: 3482594 (1969-12-01), Simon
patent: 3548867 (1970-12-01), Grisebach

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