The most commonly used driving energy source is the power source or fluid source. If the power source is selected as the driving energy source, the three-phase power source is generally selected for the large-size valve, and the single-phase power source is selected for the small-sized valve. General electric actuators are available in a variety of power types. Sometimes DC power can be selected. At this time, the battery can be safely operated by installing a battery. There are many types of fluid sources, which can be different media such as compressed air, nitrogen, natural gas, hydraulic fluid, etc. Secondly, they can have various pressures, and the third actuator has various sizes to provide output torque.
CONTROL VALVE TYPE
When selecting the actuator for the control valve, it is necessary to know the type of control valve so that the correct actuator type can be selected. Some valves require a multi-turn drive, some require a single-turn drive, and some require reciprocating drive, which affects the choice of actuator type. Generally, a multi-turn pneumatic actuator is more expensive than an electric multi-turn actuator, but a reciprocating straight-stroke pneumatic actuator is less expensive than an electric multi-turn actuator.
For 90-degree swing valves such as ball valves, disc valves, and plug valves, it is best to obtain the corresponding valve torque through the DATIAN valve factory. Most valve manufacturers are testing the valve to operate the required torque at the rated pressure. This torque is provided to the customer. For multi-turn valves, these valves can be divided into reciprocating (lifting) motion – valve stem does not rotate, reciprocating motion – stem rotation, non-reciprocating – stem rotation, valve stem must be measured The diameter, stem connection thread size has been determined by the actuator specifications.
Once the actuator type and the required drive torque for the valve are determined, the datasheet or selection software provided by the actuator manufacturer can be used for selection. Sometimes the speed and frequency of valve operation need to be considered.