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US 5,230,364 AGranted
Pressure relief valve
AssigneesVickers, Incorporated, Tokimec Inc.
InventorsJohn L. Leng, Tsuyoshi Ando, Kousuke Hatakenaka, Akio Mito
Life of this patent
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AssigneesVickers, Incorporated, Tokimec Inc.
InventorsJohn L. Leng, Tsuyoshi Ando, Kousuke Hatakenaka, Akio Mito
Estimating the term…
A proportional pressure release valve comprising a valve body incorporating a valve seat, a valve closure member mounted in the valve body and cooperable with the valve seat to control flow of fluid through the valve from an inlet pressure port to an outlet tank port, and electromagnetic control means having a push pin operable to move, via resilient means, the valve closure member in dependence upon the magnitude of a control current applied thereto, wherein the valve further comprises damper means provided between the push pin and the valve closure member. The valve may also comprise an anti-cavitation ring having a bore and disposed downstream of the valve seat, the anti-cavitation ring being apertured to provide a fluid connection between the ring core and the tank port. The valve closure member may be guided for movement towards and away from the valve seat by guide means comprising at least one linear bearing.
A proportional pressure release valve comprising a valve body incorporating a valve seat, a valve closure member mounted in the valve body and co-operable with the valve seat to control flow of fluid through the valve from an inlet pressure port to an outlet tank port, and electro-magnetic control means having a push pin operable to move, via resilient means, the valve closure member in dependence upon the magnitude of a control current applied thereto, wherein the valve further comprises damper means provided between the push pin and the valve closure member, wherein the damper means is in the form of a dash pot, and wherein the resilient means is in the form of a buffer spring acting between two spring rests associated with the push pin and valve closure member, respectively, the piston of the dash pot being carried by one spring rest and the cylinder of the dash pot being provided by the other spring rest.
A pressure relief valve comprising a valve body incorporating a valve seat, a valve closure member mounted within the valve body and co-operable with the valve seat to control the flow of fluid through the valve from an inlet pressure port to an outlet tank port, wherein the valve further comprises an anti-cavitation ring having a bore and disposed downstream of the valve seat, the ring being apertured to provide a fluid connection between the ring bore and the tank port.
A proportional pressure release valve comprising a valve body incorporating a valve seat, a valve closure member mounted int he valve body and co-operable with the valve seat to control flow of fluid through the valve from an inlet pressure port to an outlet tank port, and electro-magnetic control means having a push pin operable to move, via resilient means, the valve closure member in dependence upon the magnitude of a control current applied thereto, wherein the valve further comprises damper means provided between the push pin and the valve closure member, wherein the push pin is formed from a free-machining, substantially non-magnetic material and is coated, on at least the outside, with electroless nickel having a phosphorous content of at least 10% by weight, or boron content of 1-5%, inclusive, by weight, and being heat treated at a temperature in the range of 250.degree. C. to 350.degree. C., inclusive.
Dependencies are inferred from the claim text.