Resources Contact Us Home
Hydraulic unloading valves

Image Number 3 for United States Patent #4766926.

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.

  Recently Added Patents
System for seeking for an optimal configuration of a bi-, tri- or multi-ventricular cardiac resynchronization implanted device
Imaging apparatus, control method thereof, and program
Crowd validated internet document witnessing system
Systems and methods for printing images outside a normal color gamut in image forming devices
Dual use photovoltaic system
Antibodies to OX-2/CD200 and uses thereof
Calibration method for non-ideal transceivers
  Randomly Featured Patents
Apparatus and method for analyzing a golf swing
Fabricated liner article and method
Pipe coupling and method of joining materials
Apparatus and method for controlling DC-AC power conversion
Flying height tester and flying height test method
Noise-shaped coefficient rounding for FIR filters
Head harness for night vision device
Query optimizer with join cardinality estimation which mitigates the effects of skew
Method of using a water pipe
Radial travel limiter for lighter socket lances