Solenoid valve
A globe-valve body with a small rectangle on top containing the letter S. Solenoid valves switch on a discrete signal. You'll find them on instrument-air supply, ESD trip valves, and any binary on, off service.
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How it’s drawn.
A valve body with a small box on top carrying the letter S. The solenoid switches the valve on a discrete signal rather than modulating it, so it appears on instrument-air supply, on trip valves, and on simple open-or-shut service.
Typical usage.
Wired through a DO channel from the BPCS or SIS. SIS-classified solenoid trip valves go to certified solenoid hardware. BPCS solenoids are commercial-grade.
Telling it apart.
- The S box marks switching, not throttling. A solenoid valve is open or shut, not a control valve.
- A safety trip solenoid and a basic-control solenoid look alike on the body. The difference is in the system it answers to, usually carried by the tag and notes.
- The solenoid often pilots a larger actuator rather than stopping the process flow directly.