49
4.10
C
ONNECT TRANSDUCERS AND CONTROL PIPEWORK ON
PRV
SIDE
Before proceeding, confirm that any pressure transducers are of a suitable pressure
range, that the channels have been set up, and the transducers have been re-zeroed at
atmospheric pressure.
Connect any
external
pressure transducers to the appropriate location on the PRV
valve, ensuring that:
•
The upstream
side is connected to the “PRV Inlet Pressure” connector
.
•
The downstream
side is connected to the “PRV Outlet Pressure” connector.
Connect any
internal
pressure transducers, by attaching the pipe quick-release
connector to the appropriate location on the PRV valve.
•
Ensure the upstream
side is connected to the “PRV Inlet Pressure”
transducer.
•
Ensure the downstream
side is connected to the “PRV Outlet Pressure”
transducer.
If not already attached, connect the water feed to the Hydroswitch.
The water feed should come from the inlet side of the PRV if the pressure is below 90m;
otherwise, the water feed should come from the outlet side of the PRV (which has a
reduced pressure).
Caution:
Move the manual 3-way valve into the middle position (all ports are sealed).
Do not attempt to pressurise or bleed the connected plumbing at this stage or
high pressure water could be released from open pipe-ends.
4.11
P
REPARING TO FIT THE ACTUATOR
Note: The following instructions
assume that the valve is
neither vented to the
maximum (fully open),
nor used to cut the water
supply (fully closed) but is
under the control of the
fitted pilot valve.
It also assumes that the
PRV is fitted with service
stop-taps at the relevant
ports on the valve,
allowing the components
surrounding the main
valve to be serviced.
Ensure that the PRV is working
properly before proceeding.
Stop Taps
(for service)
