Hydraulic unloading valves

Details Hydraulic unloading valves Hydraulic unloading valves

1987-09-16

1988-08-30

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137468, 137501, G05D 701

Patent

active

047669268

ABSTRACT:
An hydraulic unloading valve for unloading hydraulic fluid from a circuit pressurized by a diesel engine powered pump under cold climate conditions to assist starting of the engine. The valve has an inlet through which fluid enters the valve, an outlet through which fluid may leave the valve, an outlet valve seat, a valve member movable towards and away from the valve seat and carrying a valve surface for closing off the seat valve, a first orifice sensitive to viscosity which in response to the flow of fluid through the inlet generates a first pressure drop arranged to tend to move the valve member away from the valve seat, and second orifice which is not sensitive to viscosity and which in response to said flow generates a second pressure drop arranged to tend to move the valve towards the valve seat to bring the valve seat and surface into contact to close-off through the valve outlet when the second pressure drop is greater than the first pressure drop. The pressure drop characteristics of the two orifices can be arranged so that at lower fluid temperatures of say below -10 degrees C. the valve is held open up to higher fluid flow rates, thus relieving load on the engine and assisting cold starting.

REFERENCES:
patent: 4440192 (1984-04-01), Doennelly
patent: 4557287 (1985-12-01), Laufer

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