Title:
Hydraulic drive for steam valves, combined steam valves and steam turbines
Document Type and Number:
Japanese Patent JP6352781
Kind Code:
B2
Abstract:
A hydraulic driving device for a steam valve includes a plurality of hydraulic actuators to generate driving force to be transmitted to the valve body through a valve shaft of the steam valve. The hydraulic actuators each include a cylinder, a piston that is capable of reciprocating in the cylinder, and a rod having respective ends connected to the piston and valve shaft. The hydraulic actuators include a main actuator including a throttle portion for regulating a flow of pressure oil in a hydraulic chamber defined by the cylinder and piston so that a damping force is applied to the valve body during its closing operation. The one or more hydraulic actuators other than the main actuator include at least one sub actuator not having the throttle portion. The hydraulic chamber of the sub actuator communicates with the hydraulic chamber of the main actuator.
Inventors:
Kensuke Futahashi
Hama Yuhisa Taba
Hama Yuhisa Taba
Application Number:
JP2014238523A
Publication Date:
July 04, 2018
Filing Date:
November 26, 2014
Export Citation:
Assignee:
Mitsubishi Hitachi Power Systems Co., Ltd.
International Classes:
F15B11/04; F01D17/10; F15B15/22; F16K1/00; F16K1/44; F16K31/122
Domestic Patent References:
| JP57199792A |
Foreign References:
| WO2014098073A1 |
Attorney, Agent or Firm:
Seishin ip patent business corporation
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