Hydraulic isolation valve

Details Hydraulic isolation valve Hydraulic isolation valve

1988-04-20

1989-08-29

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

303 71, 303 842, B60T 1718

Patent

active

048607819

ABSTRACT:
A safety system for hydraulic brakes in a train brake system wherein a spring biased spool valve controls delivery from a hydraulic fluid source to at least two sets of spring applied hydraulic brake actuators and wherein said spool valve is also biased by the fluid pressure delivered to said two sets of brake actuators and upon a rupture in a brake line delivering fluid to one brake actuator, which causes a lowering of a fluid pressure force on the spool valve, causes the spool valve to shut off the delivery of fluid to the ruptured line to allow the spring applied hydraulic brake actuator to engage the applied brake.

REFERENCES:
patent: 2710620 (1955-06-01), Watson
patent: 3018786 (1962-01-01), Stratton
patent: 3473851 (1969-10-01), Neves
patent: 3627385 (1971-12-01), Stokes
patent: 3738709 (1973-06-01), Stokes
patent: 3753601 (1973-08-01), Hensley
patent: 4281880 (1981-08-01), Gaiser et al.
patent: 4284308 (1981-08-01), Hayashida
patent: 4422694 (1983-12-01), Schopper et al.

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