Electric Linear Travel Actuator

Electric Linear Travel Actuator

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Electric Linear Travel Actuator Selection Elements

The following elements must be considered when selecting a suitable valve actuator type and size：

Driving Energy

The most commonly used driving energy is power or fluid source. If power is selected as the driving energy, three-phase power is generally used for large size valves, and single-phase power can be used for small size valves. Generally, electric actuators can have multiple power supply types to choose from.

Sometimes DC power supply is also optional, when power failure safety operation can be achieved by installing batteries. There are many kinds of fluid sources, first of all, they can be different media such as: compressed air, nitrogen, natural gas, hydraulic fluid, etc. Secondly, they can have various pressures, and sometimes DC power supply is also optional, at this time, you can realize the power failure safety operation by installing batteries. There are many kinds of fluid sources, firstly, they can be different media such as: compressed air, nitrogen, natural gas, hydraulic fluid, etc., secondly, they can have various pressures, and thirdly, the actuators have various sizes to provide output force live torque.

Valve Type

When selecting an actuator for a valve, it is important to know the type of valve so that the correct type of actuator can be selected. Some valves need multi-turn drive, some need single-turn drive, some need reciprocating drive, and they influence the choice of actuator type. Usually pneumatic actuators with multi-turn are more expensive than electric multi-turn actuators, but pneumatic actuators with reciprocating direct stroke output are cheaper than electric multi-turn actuators.

Torque size

For 90 degree rotary valves such as: ball valves, disc valves, plug valves, it is best to obtain the appropriate valve torque size through the valve manufacturer, most valve manufacturers do this by testing the valve for the required operating torque of the valve at rated pressure, and they provide this torque to the customer.

For multi-turn valve situation is different, these valves can be divided into: reciprocating (lifting) motion - stem does not rotate, reciprocating motion - stem rotates, non-reciprocating - stem rotates, the diameter of the stem must be measured, the stem connection thread size has determined the actuator specifications.

Actuator Selection

Once the actuator type and the required drive torque of the valve have been determined, the selection can be made using the data sheet or selection software provided by the actuator manufacturer. Sometimes it is also necessary to consider the speed and frequency of valve operation.

Fluid-driven actuators have adjustable travel speeds, but electric actuators with three-phase power only have a fixed travel time.

Some of the smaller DC electric single rotary actuators can be adjusted for travel speed.