GB1108120A - Hydraulic control apparatus for a pipeline valve - Google Patents

Abstract

1,108,120. Valves. ACF INDUSTRIES Inc. 25 May, 1966, No. 23354/66. Heading F2V. [Also in Division F1] Opposite ends of a cylinder 56, Fig. 3, housing a double-acting piston 54, Fig. 2, for controlling a gate valve slide 44 in a submerged oil supply line 22 are connected by flexible hoses 154, 156, unions 80 and ducts 146, 148 to a three-position remotely controlled distribution valve 144 which in the central position shown connects ducts 146, 148 to a reservoir return duct 150 and in either end portion connects one or other of ducts 146, 148 to the delivery duct 142, of a power driven pump 120 and the other duct to return duct 150, and the pump delivery may by-pass valve 144 and flow through ducts 164, 162 to a manually operated closed centre three position distributing valve 160 and thence through one or other ducts 154, 156 according to its end position, the duct not so pressurized being connected to the return duct 150; an auxiliary manual pump 190 also drawing from the reservoir R being available for pressurizing duct 142 in the event of failure of pump 120. A second power operated pump 120<SP>1</SP> in parallel with pump 120 may be selectively actuated from a common compressed gas source 84 and a further cylinder 56<SP>1</SP> is connected through bases 154<SP>1</SP>, 156<SP>1</SP> to a manual valve 160<SP>1</SP> and a remotely controlled valve 144<SP>1</SP> to a pump delivery manifold 142. Double check valves 152, 152<SP>1</SP> prevent escape of hydraulic fluid from cylinders 56, 56<SP>1</SP> when valves 144, 144<SP>1</SP> are in their central vented positions. A visual flow indicator 170, 170<SP>1</SP> in the return duct 166 of valves 160, 160<SP>1</SP> gives an indication of the rate of opening or closing of valve slides.