F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/63
F15B 11/00 (2006.01)
Patent
CA 1151977
Flow-Pressure Compensated Control for Variable Displacement Pumps Abstract A flow-pressure compensated or "load-plus" valve is oftentimes utilized in the servo-system for a variable displacement pump to maintain pump discharge pressure above a minimum pressure level and above a load pressure in a fluid actuator. Valves of this type normally employ a spring interconnected between a modulating spool and a piston responsive to load pressure to modulate a control pressure, controlling the displacement of the pump. Such valves thus provide a constant discharge pressure margin over load pressure while providing the pump's minimum stand-by pressure. An improved circuit has a load-plus valve with a spool movable between a first position communicating a control pressure from a pump to a control chamber and a second position at least partially venting the control chamber. A piston is movable between a first position isolating the piston from the spool to enable the spool to move independently of the piston and a second position engaging and moving the spool to modulate the control pressure in response to variations in a load pressure in a fluid actuator.
376582
Caterpillar Tractor Co.
Smart & Biggar
LandOfFree
Flow pressure compensated control for variable displacement... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flow pressure compensated control for variable displacement..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow pressure compensated control for variable displacement... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-182563