Typical scheme of gate valve control realized in control cabinet provides 2 control modes: local (from local control panel without PLC participation) and remote (from PLC). The gate status information is available to the PLC in both modes. The control circuitry disables the gate actuator either by the open and closed position limit switches or by the gate torque clutch limit switch (retractable closing).
The gate valves are controlled by reversing starters, solid state relays or PBR (contactless reversing starter). Protection is provided by means of motor protection circuit breakers and thermal releases.
For adjustable gate valves, schemes with feedback from the gate positioner and either pulse control or analog control with a separate power supply to the gate are used. Similar control of gate valves with pneumatic actuator is realized in the same way.
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