Valve arrangement and hydraulic drive

Details Valve arrangement and hydraulic drive Valve arrangement and hydraulic drive

2006-07-25

2006-07-25

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C091S464000, C091S455000

Reexamination Certificate

active

07080590

ABSTRACT:
The invention concerns a valve arrangement for controlling a hydraulic drive having a first working connection (A) and a second working connection (B), and being connectable with or separable from a pressure source (P), the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the energetic efficiency of the valve arrangement. For this purpose, the first working connection (A) is connected with a first control valve and the second working connection (B) is connected with a second control valve, the first and the second control valves being connected with each other and with a third control valve, which is connected with a tank.

REFERENCES:
patent: 4572238 (1986-02-01), Stenlund
patent: 4611528 (1986-09-01), Nanda et al.
patent: 4840111 (1989-06-01), Garnjost
patent: 5138838 (1992-08-01), Crosser
patent: 5568759 (1996-10-01), Aardema
patent: 5960695 (1999-10-01), Aardema et al.
patent: 6354185 (2002-03-01), Sturman
patent: 6467264 (2002-10-01), Stephenson et al.
patent: WO 96/27051 (1996-09-01), None

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