Steam valve driving apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Energy Systems & Solutions Corporation
InventorHidekazu Miyajima
Life of this patent
Estimating the term…
Abstract
In a steam valve driving apparatus according to an embodiment, a control valve permits or blocks a flow of hydraulic oil from a supply port to an opening direction piston chamber. A dump valve blocks or permits the flow of the hydraulic oil from the opening direction piston chamber to a discharge port. A blocking valve permits or blocks a flow of the hydraulic oil from an accumulator to a closing direction piston chamber. The control valve permits the flow of control oil from the closing direction piston chamber to the discharge port in a state where the flow of hydraulic oil from the supply port to the opening direction piston chamber is permitted.
Claims16
A steam valve driving apparatus regulating open and close position of a steam valve, comprising:
- a supply port configured to supply hydraulic oil;
- a discharge port configured to discharge the hydraulic oil;
- a cylinder including a piston joined to the steam valve, an opening direction piston chamber to which the hydraulic oil for pressing the piston in an opening direction of the steam valve is supplied, and a closing direction piston chamber to which the hydraulic oil for pressing the piston in a closing direction of the steam valve is supplied;
- a control valve configured to permit or block a flow of the hydraulic oil from the supply port to the opening direction piston chamber;
- a dump valve configured to block or permit a flow of the hydraulic oil from the opening direction piston chamber to the discharge port;
- an accumulator configured to store the hydraulic oil under pressure;
- a blocking valve configured to permit or block a flow of the hydraulic oil from the accumulator to the closing direction piston chamber;
- and
- a trip solenoid valve configured to control the dump valve and the blocking valve,
- wherein the control valve configured to permit a flow of a control oil from the closing direction piston chamber to the discharge port in the permission of the hydraulic oil from the supply port to the opening direction piston chamber.
A steam valve driving apparatus regulating open and close position of a steam valve, comprising:
- a supply port configured to supply hydraulic oil;
- a discharge port configured to discharge the hydraulic oil;
- a cylinder including a first piston joined to the steam valve, an opening direction first piston chamber to which the hydraulic oil that presses the first piston in an opening direction of the steam valve is supplied, and a second piston releasably arranged with respect to the steam valve, an opening direction second piston chamber to which the hydraulic oil that presses the second piston in the opening direction of the steam valve is supplied, and a closing direction second piston chamber that presses the second piston in a closing direction of the steam valve;
- a control valve configured to permit or block a flow of the hydraulic oil from the supply port to the opening direction first piston chamber;
- a first dump valve configured to block or permit a flow of the hydraulic oil from the opening direction first piston chamber to the discharge port;
- a trip solenoid valve configured to permit or block a flow of the hydraulic oil from the supply port to the opening direction second piston chamber;
- and
- a second dump valve configured to block or permit a flow of the hydraulic oil from the opening direction second piston chamber to the discharge port,
- wherein the second piston is joined to the steam valve in a case of closing the steam valve, and is separated from the steam valve in a case of opening the steam valve.
Dependencies are inferred from the claim text.