Control method and control device of slow speed type electric valve

Abstract

The invention discloses a control method and a control device of a slow speed type electric valve. The control method is characterized in that a control box is internally provided with a ripple time relay, thereby achieving the purpose of adjusting the rotation speed of an electric valve motor and the running time in the opening and closing process. The control method not only can prevent a pipeline from generating a water hammer when the electric valve is rapidly opened and closed, and the deformation and detonation of the pipeline are avoided; and a valve electromotion device is prevented from abidingly operating for a long time, the burnt phenomenon of the valve electromotion device is avoided, the power of a motor is reduced, and the investment cost and operating cost are reduced.

Description

technical field [0001] The invention relates to a control method and a control device for a slow-speed electric valve, in particular to the control of the switching process of the electric valve and the control of the power-on time of the electric valve. Background technique [0002] At present, due to the extensive use of electric valves in the production of electric power, metallurgy, petroleum, chemical industry, papermaking, water plants, sewage treatment and other industries, the electric valves used in some large-diameter pipelines are prone to water hammer during use. And the phenomenon that the valve electric device runs for too long. The above two phenomena are now introduced in detail. [0003] Water hammer phenomenon: When the valve is suddenly opened or closed during oil transportation, water hammer phenomenon will appear in the pipeline, especially when the liquid changes from motion to stop suddenly, the possibility of water hammer is greater, and it is in the...

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Problems solved by technology

[0005] In response to the above problems, there are currently some countermeasures, for example, in order to prevent the occurrence of water hammer, a bypass valve pipeline is connected in parallel with the main valve pipeline, or a surge well is installed in front of the valve, a water hammer eliminator, an air cylinder, etc. measures to achieve the purpose of avoiding water hammer, but these measures will increase a lot of costs and are very uneconomical

For example, in order to meet the short-time working requirements of the valve electric device, the means of increasing the motor specification of the valve electric device can be adopted. However, this not only increases the production cost, but also increases the weight of the valve electric device and increases the transportation cost.

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