Valve Actuator

The question is too vague; please reformulate it.

Dear Sir,

thanks for your reply and I can give more details regarding this subject,

in a 10" process line ( Design pressure 46.2 bar) there is a SDV controlled by an Actuator. for the sizing of this actuator how it will related with the line design pressure and what will be the differential pressure of this actuator.

thanks and Regards

Vani

There is no need to go there. Just give all the process and utility information to the local Valves Distributor, together with the facility's Standards, and get that organisation to size and to quote.

In what context?

A variety of factors influence whether an actuator can close a valve against the line pressure.

A specific size actuator with a specific spring bench setting at a specific air supply pressure can close against X amount of differential pressureaccomplish given a specific valve trim in a specific valve body.

Since I'm an old guy, I used to have to look up on a table what the pressure differential was for different sized actuators with various spring bench settings, with different valve trim in different bodies, as the old chart shows.