F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
F15B 13/042 (2006.01) F04B 49/08 (2006.01) F15B 13/16 (2006.01) G05D 16/18 (2006.01)
Patent
CA 2124552
Abstract of the Disclosure An improvement in and method of operating a load sens- ing system in which a variable displacement, pressure com- pensated pump delivering hydraulic fluid to a fluid operat- ing device through a directional control valve is con- trolled by a load-sensing system pressure limiter which is set so that the system operates at the maximum continuous system operating pressure. By also setting pump destroke pressure slightly higher than the necessary operating pres- sure for the load, optimum performance of the pump is rea- lized. The load-sensing system pressure limiter is con- figured as a poppet which is placed inside of the body of the directional control valve and is biased by an adjust- able spring force to the closed position. Preferably, the poppet connects the load sensing core of the directional control valve to an exhaust passage therein so as to re- quire minimal modification of the directional control valve. In a preferred embodiment, the poppet has a bleed- down orifice extending therethrough to unload the load pressure signal when work has been completed or diminished.
Rost Alvin S.
Tschida Donald W.
Dana Corporation
Ridout & Maybee Llp
LandOfFree
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