How can a manual ball valve or gate valve be equipped with a pneumatic actuator to become a pneumatic control valve? ? ?
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As the title suggests, it’s mainly an explanation from a structural perspective.
Does anyone know this? I really want to know.
First of all, it should be noted that gate valves are not suitable as control valves, while ball valves can be used as control valves. To convert a manual ball valve into a pneumatic control valve, it is first necessary to select an actuator; the pneumatic piston actuator should be chosen for this purpose ； Next, the valve body is connected to the actuator, mainly by connecting the valve stem to the piston ； Third, install the valve positioner and connect the piping, making sure to add an air-shutoff safety cylinder to meet the requirements for opening, closing, or maintaining the valve in case of a failure. Finally, configure on the DCS to achieve automatic control.
Gate valves are not suitable as control valves, while ball valves are generally used as on/off shut-off valves.
I’m sorry, it’s a shut-off valve, not a control valve.
Regardless of whether gate valves or ball valves are suitable as control valves, if you want to switch to pneumatic control valves, the following accessories are required: pneumatic actuators (available in diaphragm and piston types), valve positioners, etc. If you wish to switch to a pneumatic cut-off valve, the following accessories are required: select an appropriate cylinder based on the valve’s torque, choose a solenoid valve, select connectors for the cylinder and the valve stem, and select a valve feedback device.