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
Resin composition and molded article
Isolated Australian coral reef fluorescent proteins and cell-based kinase or phosphatase platforms for cancer drug development
Method of making an array of nucleic acid colonies
Means to securely fixate pacing leads and/or sensors in vessels
Zero-copy network and file offload for web and application servers
Carrier sense multiple access (CSMA) protocols for power line communications (PLC)
  Randomly Featured Patents
Road map management system
Bat with elastomeric interface
High speed stripping apparatus
Tracking error signal detecting method selectively using a push-pull method, an improved push-pull method, and a three beam method and optical recording/reproducing apparatus using the same
Hexahydronaphthalene ester derivatives, their preparation and their therapeutic uses
Method and system for initializing a key management system
Molecule separation device and method combining multiple filtration media
Transmission for driving, counter-rotating propellers, lubrication system, and associated methods
Hose clamp
Methods for producing cytokine receptor ZALPHA11