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Valve Automation Structure And Materials
May 31, 2017

In order to successfully automate the process, the most important thing is to ensure that the valve itself can meet the process and the special requirements of the medium within the pipeline. Usually the production process and process media can determine the type of valve, the type of spool and trim and valve structure and materials.

After the valve is selected, it is necessary to consider the requirements of the automation. The actuator can be considered simply by two basic valve operating types.

1. Rotary valve (single rotary valve)

Such valves include: plug valves, ball valves, butterfly valves and damper or baffle. This type of valve requires the required torque to carry out the 90 degree rotation operation of the actuator.

2. Multi-turn valve

This type of valve can be a non-rotating lift stem or a rotating non-lift lever, or that they need a multi-turn operation to drive the valve to an open or closed position. Such valves include: through the valve (cut-off valve), gate valve, knife-type gate valve. As an option, the linear output of the pneumatic or liquid cylinder or film actuator also opens to drive the valve.

There are currently four types of actuators, they can use different driving energy, can operate various types of valves.

1. Electric multi-turn actuator

Electric-driven multi-turn actuators are one of the most common and reliable types of actuators. Use a single-phase or three-phase motor to drive the gear or worm gear to drive the stem nut, and the stem nut causes the valve stem to move the valve open or close.

Multi-turn electric actuators can drive large-size valves quickly. In order to protect the valve from damage, the limit switch installed at the end of the valve stroke will cut off the motor power, and when the safety torque is exceeded, the torque sensing device will cut off the motor power, the position switch is used to indicate the valve switch status, The handwheel mechanism for mounting the clutch unit can manually operate the valve in the event of a power failure.

The main advantage of this type of actuator is that all components are housed in a housing that integrates all the basic and advanced functions in this waterproof, dustproof, explosion-proof housing. The main drawback is that when the power failure, the valve can only remain in place, only the use of standby power system, the valve can achieve fail safe position (failure to open or fault off)

2. Electric single rotary actuator

This actuator is similar to the electric multi-turn actuator, the main difference is that the final output of the actuator is a quarter of 90 degrees of movement. The new generation of electric single-turn actuators combine the complex functions of most multi-turn actuators, such as parameterization and diagnostics using a non-user-friendly user interface.

 

Single-turn actuators are compact and can be mounted on small-sized valves, typically up to 800 kg in output torque, and should be required for smaller power supplies. They can be fitted with batteries for fail-safe operation.

3. Fluid driven multi-turn or linear output actuator

This type of actuator is often used to operate straight-through valves (shut-off valves) and gate valves, which use pneumatic or hydraulic operation. Simple structure, reliable, easy to achieve safe and safe mode of operation.

Often people use electric multi-turn actuators to drive gate valves and shut-off valves, and only use hydraulic or pneumatic actuators when there is no power supply.