WORKING OF MANIFOLD VALVES

Manifold valves

Theory

      Manifold is a device used to control the pressure operated instruments. There are 3 types of manifold valves used in industry,  2 way manifold valve used in conjunction with pressure indicating instruments &transmitter, 3 way and 5 way manifolds are commonly used in industry for differential instruments. The 3way and 5 way manifold valves are used in conjunction with pressure level and flow measurements of steam, chemicals &toxic gases.

Procedure:

        Instructions for line up the transmitter using 5 way manifold in process line are as given below:-

1.     Open the equalizing valve.

2.     Close the high side and low side isolation valves.

3.     Close the drain valve.

4.     Open the high and low side process isolation valve.

5.     Close the equalizing valve, then the transmitter starts reading.

   For zero checking of DP instrument do th following:-

1.      Open the  equalizing valve.

 2.  Close the high side and low side isolation valve.

 3.  Open the transmitter vent, then we will get the zero reading.