How to properly adjust the valve s motorization

In the process of production and water supply in industrial enterprises, especially urban waterworks, a large number of ordinary gate valves, butterfly valves, and hydraulic butterfly valves are used to control tap water production, which is a major equipment for water supply enterprises. Among the various types of valves used is the number of gate valves.

The electric gate valve is composed of an electric valve and a gate valve.

Control the opening and closing of the gate valve. It can be operated in the field or from a distance.

The valve electric device consists of an electric motor, a reducer, a torque limiting mechanism, and a stroke control machine.

It is composed of a manual electric conversion mechanism, an opening indication mechanism and an electrical controller. Electricity.

If the electric device of the moving gate valve is not properly adjusted, the service life of the gate valve will be shortened; Heavy.

Serious incidents such as the fracture of the cast iron casing of the valve, the burning of the control motor, and the flooding of the pump room.

Old. Therefore, in order to ensure the safety of the water supply, it is necessary to carefully adjust the electric gate.

The electric device of the valve ensures the smooth opening and closing of the electric gate valve. The following describes the two adjustment methods of electric gate valves:

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The valve electric device is equipped with gate valve, globe valve, throttle valve and diaphragm valve. It can be used for open stem valves and can also be used for dark stem valves. It can accurately act according to the control command, and is an indispensable driving device for remote control, centralized control and automatic control of various valves and dampers.

This series of products are not only used in power stations, but also in petrochemical, metallurgy, public utilities, etc.

One. Choose an electric actuator according to the type of valve.

1。Multi-turn electric actuator ** angle (360 degrees) is suitable for gate valves, globe valves, etc. The rotation of the output shaft of the electric actuator is greater than one week, that is, greater than 360 degrees, and it generally takes many turns to realize the opening and closing process control of the valve.

2。Partial rotary drive - When the drive transmits torque to the valve, the number of rotations of the output shaft is less than 1 turn. It is not necessary to be able to withstand thrust at all times. It is commonly used in ball valves, butterfly valves, etc.

2. Determine the control mode of the electric actuator according to the production process control requirements.

1。Switch-on (open-loop control) switch-on electric actuators generally realize the opening or closing control of the valve, the valve is either in the fully open position or in the fully closed position, and this type of valve does not need to control the flow of the medium. In particular, it is worth mentioning that switching electric actuators can also be divided into split structure and integrated structure due to different structural forms.

a) Split structure (usually called ordinary type): the control unit is separated from the electric actuator, the electric actuator can not realize the control of the valve alone, and the external control unit must be added to achieve the control, and the controller or control cabinet is generally used externally to match. The disadvantage of this structure is that it is not convenient for the overall installation of the system, increases the wiring and installation costs, and is prone to failure, and is not convenient for diagnosis and maintenance when the fault occurs, and the cost performance is not ideal.

b) Integrated structure (usually called integral type): the control unit and the electric actuator are packaged as a whole, and can be operated on the spot without an external control unit, and can be operated remotely by simply outputting relevant control information. The advantages of this structure are that it is convenient for the overall installation of the system, reduces wiring and installation costs, and is easy to diagnose and troubleshoot.

However, the traditional integrated structure products also have many imperfections, so intelligent electric actuators have been produced.

2。Regulating (closed-loop control) Regulated electric actuators not only have the function of on-off integrated structure, but also control the valve and regulate the flow of media.

3. According to the torque required by the valve to determine the output torque of the electric actuator The torque required for the opening and closing of the valve determines how much output torque the electric actuator chooses, which is generally proposed by the user or selected by the valve manufacturer, the actuator manufacturer is only responsible for the output torque of the actuator, and the torque required for the normal opening and closing of the valve is determined by factors such as the diameter of the valve, the working pressure, etc., but due to the difference in the processing accuracy and assembly process of the valve manufacturer, the torque required for the valve of the same specification produced by different manufacturers is also different. Even if the torque of the same specification valve produced by the same valve manufacturer is also different, the torque selection of the actuator is too small when the type is selected, which will cause the valve to be unable to open and close normally, so the electric actuator must choose a reasonable torque range.

Dear, I'm glad to give you the question of how to use the electric valve correctly, mine as follows: Pro, 1 Preparation before operation Before operating the valve, you should carefully read the operating instructions. Before operation, the flow direction of the gas must be clear, and attention should be paid to check the valve opening and closing signs.

Check the appearance of the electric valve to see if the electric valve is damp, and if it is damp, it should be dried; If other problems are found, they should be dealt with in a timely manner, and no faulty operation should be allowed. For electric devices that have been out of service for more than 3 months, check the clutch before starting, confirm that the handle is in the manual position, and then check the insulation, steering and electrical wiring of the motor. 2 Precautions for the operation of the electric valve When starting, confirm that the clutch handle is in the corresponding position If the electric valve is controlled in the control room, turn the transfer switch to the remote position, and then control the switch of the electric valve through the SCADA system.

If it is manually controlled, the transfer switch is played in the local position, and the switch of the electric valve is operated on the spot, and it will automatically stop working when the electric valve is opened or closed in place, and finally the operation of the transfer switch is played to the middle position. When the valve is operated on site, the valve opening and closing indication and valve stem operation should be monitored, and the valve opening and closing degree should meet the requirements. When the full-closing valve is operated on site, the electric closing valve should be stopped before the valve is closed in place, and the valve should be closed in place by micro-motion instead.

For the valve after the stroke and super torque controller are set, when the valve is fully opened or closed for the first time, attention should be paid to monitoring its control of the stroke, and if the valve switch to the position does not stop, it should be manually stopped immediately. In the process of opening and closing the valve and passing the stove, when it is found that the signal indicator is wrong and the valve has an abnormal sound, it should be stopped for inspection in time. After successful operation, the power supply of the electric valve should be turned off.

When operating multiple valves at the same time, attention should be paid to the sequence of operation and meet the requirements of the production process. When opening a larger diameter valve with a bypass valve, if the pressure difference between the two ends is large, the bypass valve should be opened to adjust the pressure first, and then the main valve: after the main valve is opened, the bypass valve should be closed immediately.

When sending and receiving pig balls (devices), the ball valves through which they pass must be fully opened. The operation of ball valves, gate valves, globe valves, and butterfly valves can only be fully opened or closed, and it is strictly forbidden to be used for adjustment. In the process of operating gate valves, globe valves and plate valves, when closed or opened to the top dead center or bottom dead center, it should be rotated 1 2 1 turns.

You first need to understand the difference between an electric control valve and an electric on/off valve.

1. The electric control valve is an electrical signal of 4 20 mA input and output (this 4 20 mA signal is generally given by a set of 1000 ohm resistors.) to control the rotation of the valve to achieve the purpose of adjustment;

2. The electric on/off valve is two-position single-knife control, energizing: on, energizing: off, no adjustment effect.

Knowing this, it is simple to change the control valve to an on-off valve, just disconnect the signal lines of the input and output in the control valve (that is, disconnect the group to give 1000 ohms of resistance), and only connect other basic wires when connecting with the control group.

It's very simple, you pull out the control panel inside. Just connect the electricity and you're good to go. To put it bluntly, it is to make complex equipment simple.

It can be achieved by replacing the matching electric actuator.

There is a clutch device inside, which realizes manual electric switching through the switching of the handle.

Manual and electric conversion actuators, which can be interchanged.

The electric control valve is generally composed of an electric actuator and a regulating valve system, and the control signal is adjusted by the electric power engineering module to export the total flow of materials, working pressure, ambient temperature, and the liquid level of the final control components through the power engineering module.