B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
138/76, 138/79.1
B66B 1/04 (2006.01) F15B 13/043 (2006.01) G05D 16/10 (2006.01) G05D 16/16 (2006.01)
Patent
CA 1303462
ABSTRACT OF DISCLOSURE The invention concerns a valve means comprising a valve body (1), a chamber space (2) disposed within the valve body (1), two running spindles (3,4) and seats (5,6) displaced to cooperate and placed within said chamber space (2), each running spindle (3,4) enabling the aperture (7,8) in the respective seat (5,6) to be controlled. The valve means comprises an input duct (9), a return duct (10) and a working duct (11), said ducts being connected to the chamber space (1), a pres- surized fluid being supplied through said input duct (9) in said chamber space (2) and the fluid being con- ducted through the controllable apertures (7,8) with the aid of the running spindles (3,4) either through the return duct (10) out from the valve means to a tank (T) or equivalent, or through the working duct (11) to at least one power cylinder (S) or equivalent, and the position of said running spindles (3,4) and the size of said apertures (7,8) being controlled with the aid of pilot valves. Through each running spindle (3,4) has been provided a passage (18,15) connecting the back chamber space (2a,2b) behind the running spindle (3,4) with the space (2) in front of the running spindle. In each passage (18,15) have been disposed pilot valves (14,16) by the aid of which the differential pressure across the running spindles (3,4) is controlled and at the same time the position of the running spindles (3,4) and the size of the apertures (7,8) are controlled, as well as the fluid flows from the chamber space (2) to the return duct (10) and/or to the working duct (11). (Fig. 1)
578006
Ridout & Maybee Llp
Rita Pentti
LandOfFree
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