GB
10. Special instructions for integrated pressure equalising valve ...
Gauge valve,
high pressure
j
-side
Gauge valve, low
pressure
i
-side
Pressure equa-
lising valve
Valve for purging
or bleeding air
2279453 08/2009 GB/D/F
WIKA Operating Instructions Differential Pressure Transmitter DELTA-trans
13
10.2 Four-way valve manifold
Functions
Shut off j- and i-process line for removing the transmitter from working
processes
Pressure equalisation for
zero point contro
l on working processes
Process line
air bleeding
10.2.1 Handling instructions
Sequence of operations to
start measuring
1. Open pressure equalising valve (middle
valve)
2. Open shut-off valve for the minus media
chamber (
i
) left valve
3. Open shut-off valve for the plus media
chamber (
j
) right valve
4. Close pressure equalising valve
Sequence of operations at the
end of the
measuring operation
(also for partial shut-
down of the system)
1. Open pressure equalising valve
2. Close shut-off valve for the minus media chamber (
i
)
3. Close shut-off valve for the plus media chamber (
j
)
Sequence of operations to
remove the transmitter
during working processes
1. Open pressure equalising valve
2. Close shut-off valve for the minus media chamber (
i
)
3. Close shut-off valve for the plus media chamber (
j
)
4.
Open valve for purging or air bleeding
