Single-effect submarine actuator for operating valves
AssigneeBiffi Italia S.R.L.
InventorGiordano Alfieri
Life of this patent
Estimating the term…
Abstract
The invention relates to the field of the submarine valve actuators, and specifically to those actuators, that in order to effect a standard valve closing operation are connected to an oleo system feeding an hydraulic cylinder (1), whose plunger (3), by a mechanical link, operates the valve and compresses a spring (8) which provides for the standard opening operation. Said actuators are provided with an input shaft (21) for connectin a ROV for valve opening and closing operations when there is a failure in the oleo system. The connection between the ROV-operated input shaft (21) and the mechanical link between the piston (3) and the spring (8) is carried out by a planetary gear reducer (15).
Claims10
Single-action submarine actuator for operating valves of a type comprising:
- an hydraulic cylinder including a plunger;
- a spring;
- a first shaft located between said hydraulic cylinder and said spring and including a rack, said shaft being selectively actuated by the plunger of the hydraulic cylinder to open the valve, and biased by the spring toward a closed position of the valve;
- and
- the actuator further comprising an input shaft for selective connection to a ROV (Remote Operator Vehicle), the input shaft being mechanically connected to the rack of the first shaft by a planetary gear reducer.
A single-action submarine valve actuator comprising:
- a first shaft including a rack;
- a hydraulic cylinder coaxial with the first shaft and including a plunger that engages a first end the first shaft, hydraulic action on the plunger urging the first shaft toward an open position of the valve;
- a spring engaging a second end of the first shaft and biasing the first shaft toward a closed position of the valve;
- and
- an input shaft selectively engaged by a Remote Operator Vehicle (ROV) and connected to the rack of the first shaft to selectively urge the first shaft toward at least one of the open and closed positions.
Dependencies are inferred from the claim text.