Relief valve with hydraulic fuse

Details Relief valve with hydraulic fuse Relief valve with hydraulic fuse

1993-11-26

1995-01-17

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137508, 91420, 92 77, F16K 1730

Patent

active

053818229

ABSTRACT:
A relief valve for the hydraulic fuse minimizes the chance of a device such as a hydraulically powered lift device from collapsing upon a break in a hydraulic input line to a cylinder powering the lift. The relief valve comprises a valve seat biased in a first direction by a relatively heavy spring and a hydraulic fuse biased away from the valve seat by a relatively light, second spring. Upon a break occurring in the hydraulic input line, back pressure urges the fuse to seat against the valve seat, thus closing the valve. Upon applying additional hydraulic pressure in the direction of the fuse, the valve seat disengages from the fuse, allowing hydraulic fluid to flow through the relief valve and thus allowing a piston in the hydraulic cylinder to retract so as to permit lowering of the lift device.

REFERENCES:
patent: 2411392 (1946-11-01), Saville
patent: 2645242 (1953-07-01), Monnich
patent: 2821209 (1958-01-01), Waterman
patent: 3131715 (1964-05-01), Sanders
patent: 3792715 (1974-02-01), Parrett et al.
patent: 3844378 (1974-10-01), Balogh
patent: 3910306 (1975-10-01), Ohrn
patent: 3972557 (1976-08-01), Hudston et al.
patent: 4373548 (1983-02-01), Chou
patent: 4555976 (1985-12-01), Wolfges
patent: 4629156 (1986-12-01), Anderson et al.
patent: 4976281 (1990-12-01), Berglund
patent: 5107679 (1992-04-01), Bartlett

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