equalizing valve

S

Thread Starter

sonicjoe_xx

Hi,

Appreciate if forum members can enlighten me on the usage of equalizing for dP transmitter/gauge.

1)what is the usage of the equalizing valve?

2)what is the right procedure if we wish to remove the transmitter?

3)what is the right procedure if we wish to install back the transmitter?

TQ
 
B

Bruce Durdle

For a flow transmitter, the equalising valve prevents full process pressure from being applied across the diaphragm.

Procedure for removal is to:

1. Open the equalising valve

2. Close the isolating valves

3. Vent/drain the valve

4. Remove the transmitter.

For installation, reverse the process.

Note that if you close the isolation valves before opening the equalising valve, any small leak in one leg can depressurise that leg.

Bruce.
 
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