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
Adaptive frame scanning scheme for pulsed X-ray imaging
Method for indicating the process of leaving a parking space
Methods and compositions related to glucocorticoid receptor antagonists and breast cancer
Method, apparatus, computer program, and computer readable storage media for controlling the insertion of tab sheets into a print job
Apparatus and method for adapted deblocking filtering strength
Method for generating optical codes for a print-context
Electronic device
  Randomly Featured Patents
Stable three legged folding chair
Method of measuring the flow rate of a liquid flowing in a fluidic channel and implementation device
Product case
Radiation shielding container for radioactive sources
Chrysanthemum plant named Yellow Limelight
Method for treating periodontal disease
Surgical gown
Method for effectuating half-pixel motion compensation in decoding an image signal
Personal warning method and apparatus for traveling loads