F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/13
F16K 31/00 (2006.01) F15B 3/00 (2006.01) F15B 20/00 (2006.01)
Patent
CA 1079704
ABSTRACT OF THE DISCLOSURE Actuating equipment for a gate valve or penstock uses both compressed air and hydraulic oil to obtain the advantages of both. A control valve directs air to a hydraulic reservoir so as to drive oil at the air pressure into one chamber of a double acting cylinder and piston connected to the gate. When the gate is not being moved it is locked in position by an air operated valve preventing oil flow. A normally energized solenoid operated control valve opens when electrical power fails so as to direct stored air from a reservoir to move the gate to a fail-safe position. Air pipelines may provide communication over some distance from the control valves to the gate valve or penstock. This can avoid running electric cable through a hazardous environment, while to give fail-safe operation in the event of damage to the pipelines, these are placed within a larger bore line supplying air to hold closed an air operated valve, which, in the event of loss of pressure in this line opens so that stored air moves the gate to its fail-safe position and also operates a valve preventing movement away from that position. To apply an enhanced force to the gate for part of its travel air drives a plunger into an oil vessel in communication with the cylinder while oil cannot flow back to the reservoir. The oil vessel and plunger are preferably housed in a single unit together with the oil reservoir, there being non-return valves between the reservoir and the vessel and between the vessel and the cylinder and an air operated valve for return flow in a conduit by-passing the non-return valves. Air to drive the plunger can be supplied through an oscillatory valve to allow the plunger to reset and apply an enhanced force to the gate automatically as required.
283200
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