Instrumentation Interview Question:

What is the function of 3-way manifold valve?

Submitted by: Balaji

excessive pressure to your differential pressure transmitter, you could damage your instrument. This is known as over-ranging the transmitter.
A three-way manifold valve is a device that prevents the instrument from being over-ranged. It also allows the isolation of the transmitter from the process loop (an option which could be used generaly for maintenance or re-calibration or fitting new equipment).
Submitted by: Arun