Steam turbine single-valve adjusting valve

Abstract

The invention discloses a steam turbine single-valve adjusting valve, which comprises a valve shell, wherein a chamber is formed in the valve shell; a partition board is arranged in the chamber, and the partition board partitions the chamber into a first chamber and a second chamber; the partition board is provided with a valve seat, and a valve disc is arranged in the valve seat; one end of the valve disc is connected with an adjusting valve rod, and the other end of the valve disc is connected with a balancing device; and the adjusting valve rod and the balancing device are positioned in the first chamber and the second chamber respectively. Because a balance piston type structure is adopted, the pull used in starting is low, the instability during starting is greatly reduced, a high-pressure oil mover and high-pressure oil passage equipment are removed, and only one high-precision actuator is adopted; and because single-valve adjustment is adopted, the instability when a plurality of valve discs are switched during operating is eliminated.

Description

technical field [0001] The invention relates to a regulating valve, in particular to a steam turbine single-valve regulating valve, which belongs to the field of steam turbine manufacturing. Background technique [0002] For small power generation steam turbine units, the steam distribution is adjusted through the regulating valve to control the size of the steam intake to control the load of the unit. The opening of the regulating valve requires a high-pressure oil motor and a set of high-pressure oil circuit equipment. During the start-up process of the steam turbine unit , the valve disc of the regulating valve needs to overcome the initial high-pressure steam pressure to open. This initial process is unstable and easily causes fluctuations in the unit speed. [0003] At present, small-scale power generation steam turbines all use group valve lifting plate control valves, which need to use an oil motor to open the control valves, and the above-mentioned effects will...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the group valve lifting plate control valve includes a valve body, on which there is a regulating valve stem 1, a beam 3, a valve disc 4 and a valve seat 5, and the regulating valve stem 1 and the valve body are sealed by a sealing gasket 2 , it needs to rely on multiple valve discs 4 to open in sequence to adjust the amount of steam intake. During the switching process of one valve disc 4 fully opening and the other valve disc 4 initially opening, it is necessary to set a degree of overlap, which is not easy to install. Adjustment, it is easy to cause a certain error, so that the load or speed instability during the switching process of the valve disc 4

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