Actuated Valve is a valve which is automatically operated by actuator. Actuated valve may refer to on-off valve which operates in fully open or fully close or control valve which operates in throttling mode. However, term actuated valve is mostly used for on-off services valve.
Actuated valve may also be named Shutdown Valve (SDV) and Blowdown Valve (BDV). Shutdown valve is valve installed for safety purpose during plant shutdown, the valve is normally open during plant operating condition and closed during plant shutdown. Blowdown valve is valve installed for safety purpose by depressurizing the system during plant emergency condition, the valve is normally closed during plant operating condition and open during depressurization.
Actuated valve mainly consists of:
- Main Body Valve
- Limit Switches
- Solenoid Valve or other pilot valve
- Air Filter Regulator
Other ancillary equipments may be attached to the valve such as quick exhaust valve to achieve desired opening or closing time, unidirectional flow regulator, etc. There are also some accessories for special application such as volume bottle for remote application, position transmitter and partial stroke test facilities for partial stroke testing.
Actuated Valve Symbol in P&ID
Below picture shows actuated valve complete with solenoid, and limit switch symbol in P&ID .