How to select the actuator and valve drive device
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Release Time：2018-04-25
The actuator and the valve body shall be assembled and debugged to form the control valve assembly. It is used to drive the valve to act, and at the same time, the mechanical position of the valve and the opening information are fed back to the automation system. form an automated control unit. Actuators in accordance with the access to energy to distinguish, there are three main categories: 1. electric actuator 2. pneumatic actuator 3. electro-hydraulic actuator (access to the hydraulic device to drive a larger torque valve, usually used for large valves) according to different valve structure and process conditions, need to choose a different actuator to meet the control needs. usually in
The actuator and the valve body shall be assembled and debugged to form the control valve assembly. It is used to drive the valve to act, and at the same time, the mechanical position of the valve and the opening information are fed back to the automation system. form an automated control unit.
The implementing agencies are divided according to the access energy, and there are three main categories:
1. electric actuator
2. pneumatic actuator
3. electro-hydraulic actuator (access hydraulic device to drive large torque valves, usually used for very large valves)
According to different valve body structure and process conditions, different actuators need to be selected to meet the control needs. Usually after determining the valve body structure and torque and process environment, the following key elements need to be identified to determine the final actuator model and function:
1. The driving torque of the valve (angular stroke part rotation and multi-rotation), or thrust (straight stroke push-pull action) is increased according to the rated driving torque of the valve30%The torque is used to ensure that under abnormal conditions, or when the driving torque is increased after the long-term operation of the valve body structure, there is sufficient torque to drive the valve.
2. The driving energy that can be provided on site. In the case of power supply and air supply at the same time, the electric actuator is preferred. The reason is that the electric drive is energy-saving (zero power consumption when there is no action) and the wiring is simple (there is no need to match the complicated gas source treatment accessories such as gas source pipeline, gas source switch, oil-water filter, etc., and the investment and operation costs can be reduced at the same time)
3, the valve action form: straight stroke or angular stroke.
4. Action mode (switch or adjustment)
5. Control signal (switch,4-20mA,0-10Vequal signal)
6. Feedback signal (passive contact,4-20mA,0-10Vequal signal)
7. Whether it is necessary to configure the torque protector to avoid the valve stem being screwed off when the valve body is blocked.
8. The connection mode between the actuator and the valve body (whether it is necessary to increase the bracket or arrange the heat sink according to the ambient temperature)
9, such as at low temperature ≤-40Under the working condition of ℃, it is necessary to configure dehumidification heater.
10, whether the need to configure the hand wheel.
Electric actuator selection steps
Confirm the straight stroke or angular stroke, confirm the valve action mode, confirm the torque, confirm the power supply, confirm the signal 6, confirm the ambient temperature, confirm whether over-torque protection is required
Pneumatic actuator selection steps
Confirm straight stroke or angular stroke
2. Confirmation of single-action and double-action: single-action can open or close the valve according to the preset air on or off mode after the air source is interrupted. Only one direction needs to use the air source, and the other direction is driven by spring thrust. The double-acting switch needs to use the air source in both directions, confirm the torque, confirm the valve action mode, confirm the control signal, confirm the feedback signal, confirm the air source accessories and positioner, and confirm the ambient temperature.
Electro-hydraulic actuator selection steps
Confirm the straight stroke or angular stroke, confirm the valve action mode, confirm the torque, confirm the power supply, confirm the signal, confirm the hydraulic accessories, confirm the ambient temperature, confirm whether over-torque protection is required
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