I'm seeing a document that denotes a membrane actuator. I've never know it before. Is it the other name for Diaphragm Actuator?Automatic Control Valves

If it's not.Oil pumps people may would like to get a good reference of these membrane actuator for my study?

Membrane-actuator is another name for a diaphragm-actuator.
This comes probably from the translation of a german document.fire pumps In the german language the diaphragm-actuator is called "Membran-Antrieb".

For the selection of the actuator for the gas-valve you have to consider the following data:Split case pumps

On-off or control valve?

For on-off-application a piston actuator (double-acting or with spring-load) may be the cheaper solution.
For a control valve the diaphragm-actuator allows a smoother movement and is the better solution. The diaphragm-actuators have normally springs as a standard to provide a certain position in case of de-energizing.

In any case you have to consider as well the necessary stroke and the necessary force.Vacuum pumps
Also the rising time has to be considered, depending on the application.
For control-purposes a positioner (position-controller) is a must.

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