Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Personal IP toll-free number
System and method for seamlessly increasing download throughput
Clock distribution circuit
Measurement system service for a vehicle instrument panel
Detection and use of low molecular-weight modulators of the cold-menthol receptor TRPM8
Light-emitting device with a spacer at bottom surface
Synthesis of 8-amino boron dipyrromethenes having blue fluorescence
  Randomly Featured Patents
Chemical combination for the generation of disinfectant and heat
Side under spoiler mounting structure
Endoscopic multiple ligating clip applier
Inkjet printhead having nozzle arrangements with hydrophobically treated actuators and nozzles
High velocity fan
Traffic monitor using leaky bucket with variable fill
Solvent extraction process involving membrane separation of extract phase and/or intermediate zone phase
Waveguide slot type radiator having construction to facilitate manufacture
Method for multiplexing data and control information
Video switching circuit and television receiver incorporating thereof