B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
137/105
B66B 1/00 (2006.01)
Patent
CA 1263068
ABSTRACT The invention relates to an electrically controlled valve apparatus provided with an inlet conduit (2) for the pressurized fluid, an outlet conduit (12) for the tank (T) in order to discharge the fluid from the valve apparatus and with an outlet conduit (19) for an actuator proper, such as a cylinder (S). The valve apparatus comprises a chamber (5) whereto the inlet conduit (2) is connected and which is provided with two openings (10, 11) provided with operating spindles (6, 7). Through these openings the pressurized fluid can flow from the chamber (5) via the outlet conduits (12, 19) onto the cylinder and into the tank, or from the cylinder into the tank according to how the position of the operating spindles is adjusted with respect to the said openings. The valve apparatus also comprises two throttle valves (42) for constructing the conduits (52, 53; 40, 45) located between the back chambers (31, 24) of the operating spindles (6, 7) and the fluid tank (T). The operation of the throttle valves is adjusted by means of one or several electric actuators (55). The valve apparatus also comprises at least one sensor (58) for measuring the motional velocity of the lift cage or a corresponding quality, and a control unit (57), which is among other things employed for adjusting the throttle valves, by aid of their actuators, on the basis of the information received from the sensors so that the position of the operating spindles, and the hydraulic flows in the openings regulated by the said operating spindles, are such that the lift cage (HS), the hoist platform or equivalent behaves in a predetermined way. (fig. 3)
521252
Rita Pentti
Swabey Ogilvy Renault
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