Control method and control device of slow speed type electric valve

A technology of electric valve and control method, applied in the direction of valve operation/release device, valve device, valve details, etc., can solve the problems of increasing weight, increasing production cost, increasing transportation cost, etc., to avoid burnout and avoid water hammer. Effect

Active Publication Date: 2012-11-14
林永江 +2
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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 me

Method used

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  • Control method and control device of slow speed type electric valve
  • Control method and control device of slow speed type electric valve
  • Control method and control device of slow speed type electric valve

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[0020] The present invention will be described in detail below with reference to the drawings and embodiments.

[0021] The present invention is to add a pulsation time relay in the control box of the electric valve to reduce the opening and closing speed of the electric valve (such as figure 1 ), the control box of the electric valve includes power supply, control power supply, control operation switch and relay. Among them, the control power supply is a low-voltage DC power supply, and the control power supply provides working power for control operation switches, relays, etc. The control power supply is obtained from the power supply through the power supply circuit. The power supply circuit is a step-down and rectification circuit. After stepping down and rectifying the AC power supply, a low-voltage DC control power supply is obtained. The control operation switch controls the power supply connected to the motor of the electric valve through a relay to open and close the val...

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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...

Claims

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Application Information

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IPC IPC(8): F16K31/04F16K31/05
Inventor 林永江范秀清陈连兵
Owner 林永江
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