Changing the actuator of ON/OFF valves. We have many on/off valve in our gas treatment plant and some actuators were damaged and need to use spare parts for some of them and some item we will replace actuator totally. Also we have drawing of valve and some information (e.g force to open and force to close). First my question is: could we replace these actuators with new and another brand? Is there any restriction for replacement? You can replace the bad actuators with new actuators using a different manufacturer. You know the torque required by the valve. Let's assuem that you need a single acting spring return scoth yoke style actuator for a rotating ball or butterfly valve. Select the actuator with a balance of spring and piston forces that well exceed the valve torque based upon your minimum air supply. I normally use a valve automation house to provide the assembled valve and actuator including all accessories and testing. You can send the valve model, minimum air supply and torque requirements to an automated valve packager and request them to select the actuator. Also advise if you need open and closed position switches, position indicator and any specific language, solenoid valve and voltage, etc.

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