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
Detachably integrated battery charger for mobile cell phones and like devices
Pressure-applying member, fixing device, and image forming apparatus
Management of temporal data by means of a canonical schema
Device for transmitting data between a serial data bus and working modules such as actuator modules and/or I/O modules
Mobile terminal based on W-CDMA system having receive diversity function and system thereof
  Randomly Featured Patents
Method and apparatus for measuring position by image processing
Multi-disk clamp end effector
Socket assembly for use with solder ball
Performance improvement for a multi-chip system via kerf area interconnect
Wheel rim mounting device for variable wheel spacing
Systems and methods for handling a plurality of communications for different companies
Determining the address of a system call table to perform antivirus tasks in a computer
Using shared memory with an execute-in-place processor and a co-processor
Thin film transistor array panel for liquid crystal display
Hasp enclosure