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
Power-saving receiver
Image forming apparatus
Adding co-users to user definable co-user lists
Document layout method
Extract of Vanilla planifolia
Drug comprising as the active ingredient proliferative vector containing survivin promoter
Method of optimizing air mover performance characteristics to minimize temperature variations in a computing system enclosure
  Randomly Featured Patents
Eyeglass retainer with decorative attachment
Crystalline N-(S-3-methylheptanoyl)-D-gamma-glutamyl-glycyl-D-alanine, and processes and intermediates therefor
Process for the preparation of cyclopropane compounds
Timer for coin operated devices
System and method for automatically loading software components
Spring-loaded fork assembly for shift system
Chemical-sensitization photoresist composition
Hurricane resistant precast composite building system
Method of manufacturing a matrix for producing optical disks without the medium of a master
Decorative lighting and rotating display fixture