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
Resource capacity monitoring and reporting
Online data conversion technique using a sliding window
Systems and methods for determining muscle force through dynamic gain optimization of a muscle PID controller for designing a replacement prosthetic joint
Process for the enzymatic reduction of enoates
Vehicle drive control system
Resin composition and molded article
Waterproof wound protector
  Randomly Featured Patents
Metal sheathed cable assembly
Speech command management dependent upon application software status
Microwave oven
Termination structure of DMOS device and method of forming the same
Pharmaceutical tablet
Stilbene-based materials, their preparation and use
Tenodesis implant and inserter and methods for using same
Spectrally selective shutter mechanism
Dispenser for pasty compositions
Systems and methods for compound risk factor sampling with integrated market and credit risk