F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 7/02 (2006.01) F04B 15/02 (2006.01)
Patent
CA 2115845
A HYDRAULIC CONTROL DEVICE FOR A VISCOUS FLUID PUMP ABSTRACT OF THE DISCLOSURE In a hydraulic control device for a viscous fluid pump with at least one feed cylinder (11) drivable by a hydraulic cylinder (12), the feed chamber (17) of which can be alternately connected via a hydraulically oper- able inlet valve (18) a hydraulically operable outlet valve (21) to a reservoir (19) and a feed line (22), whereby in the loading phase of the feed cylinder (11) the inlet valve (18) is open and the outlet valve (21) closed and in the feed phase of the feed cylinder, in which its piston is driven so as to reduce the volume in the feed chamber (17), the outlet valve is open and the inlet valve is closed, and with a hydraulic sequence control actuating the correct cyclic changeover between the inlet and outlet valves and the changeover of the pump drive, a valve forming part of the changeover control device of the sequence control and relieving the pressure in the feed chamber of the control cylinder (53) designed to actuate the outlet valve (21) takes the form of an electrically or hydraulically actuated valve (71) controlled dependently upon the high pressure in the drive cylinder (12) of the feed cylinder (11). Said valve (71) is switched to its through-flow setting on reaching an adjustable and predeterminable minimum of the pressure in the drive cylinder (12).
Benckert Hartmut
Munzenmaier Werner
Renz Hans
Kirby Eades Gale Baker
Putzmeister-Werk Maschinenfabrik Gmbh
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