Procedure for 5 way Manifold Valves in DPT

Good Day

The first thing you do is equalize the pressure. This is usually the middle valve. Open this valve. Then close the two root valves. These are the ones connected to your process. Now with the pressure equalized and the process isolated you can relieve the pressure with the other two valves. The transmitter can now be pulled and serviced. Installation is the reverse of this procedure , except prior to closing the equalizing valve you will usually find bleeders on each side of the transmitter. Open these a small amount to get the air out of the system. Some cheapie transmitters won't have bleeders. But most that connect to a five valve manifold do. It might be a good idea to blow down the root lines as they collect lots of contamination after a while. But this also depends on what your process might be. If your disassembling the transmitter from the manifold don't forget to replace the teflon or buna o rings.

Good Luck

Mike

Thank you poor_grape_farmer for your kind and informative response to my query. i rated u good answer.

A steam transmitter could really boil itself to death with live steam flowing through the impulse lines!

If all else fails, read the instructions.