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
Therapeutic compositions and methods
System and method for providing advice to consumer regarding a payment transaction
System, method and computer program product for sharing a single instance of a database stored using a tenant of a multi-tenant on-demand database system
In-vehicle electronic control apparatus having monitoring control circuit
Method and system for security authentication of radio frequency identification
Resolution setting apparatus, resolution setting method, and recording medium recording a resolution setting program when a television is used as a monitor of a computer
Fluorescent molecule and method for detecting target nucleic acid
  Randomly Featured Patents
Fabric wrinkle control composition and method
Luminescent substance of the class of nitride silicates and light source having such a luminescent substance
Replaceable blade knife
Electrolysis cell
Non-ruggedized COTS display packaging for severe environment applications
Systems, devices, and methods for improving accuracy of biosensors using fill time
Thermally stabilized acrylic adhesive compositions and novel methacrylated malemide compounds useful therein
Process for testing a laser device
Transcutaneous analyte sensor
Abrasive article containing shaped abrasive particles