2 out of 3 Process Interlocking

When using pressure gauges or level sensors ‘2 out of 3’ is common. Typically 3 gauges are installed parallel and 2 out of 3 gauges or sensors need to be online at all times to get redundancy. By implementing mechanical valve ┬áinterlocks on the block valves (often needle valves) only 1 line can be closed at a time.

Valve interlocks for 2 out of 3 applications

Please contact us for examples of sequence drawings for ‘2 out of 3’ interlocking applications