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
Active and progressive targeted advertising
Device for determining the absolute angular position of the steering wheel of an electric power-assisted steering column of a motor vehicle using weighted dynamic parameters of the vehicle
EpCAM as a reprogramming factor for non-pluripotent cells
Fine grain voltage scaling of back biasing
Single mode optical fiber with improved bend performance
Reconstruction of deforming surfaces by canceling ambient occlusion and refining 3-D shape
LED package chip classification system
  Randomly Featured Patents
Benzonaphthalene derivatives and compositions
Sound barrier
Variable-height device for supporting a boot on a ski
Constant ratio post-mix beverage dispensing valve
Reactive injection molding process for manufacturing a two-colored molded polyurethane products
Motor scooter
Car trunk caddy
Optical amplification for the fiber interferometer gyro
Method for diagnosis of functional faults in a functional architecture
Hydroxamic acid derivatives as inhibitors of the production of human CD23 and of the TNF release