Installation
Connect the control valve inlet to the pipe
work using either screw thread fittings or a
flange and appropriate gaskets and bolts.
Note the arrow on the side of the valve
indicating the direction of flow.
Connect the control valve outlet to the
tank. An optional discharge flange
assembly is available.
Commissioning and Testing
Complete the tank set-up setting the
appropriate level settings.
Connect the pilot valve flying leads to the
cable back to Tanktronic. Gently open the
upstream servicing valve.
Operate the system – complete an auto
set-up or temporarily lift the sensor cable
to initiate filling. Lowering the sensor to the
bottom of the tank will close the valve.
The closing speed valve can be adjusted to
avoid excessive pressures (water hammer)
developing in the supply pipe as the
control valve closes. The closing speed
valve is the slotted screw with lock nut
found on the top cover of the control valve.
The closing speed valve should be set to
provide a slow closure of the control valve.
If the closing speed is too short, a bang
will be heard. This must be avoided to
prevent damage to the pipe and system.
Turning the closing speed valve clockwise
will increase the delay. If the control valve
fails to close or does not close quickly
enough, the closing speed valve should be
turned anti-clockwise to shorten the
closure time.
Servicing and Maintenance
No routine maintenance should be
necessary. If debris has entered the water
supply, isolate the supply to the control
valve assembly and inspect/clean as
appropriate.
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10 INSTALLATION 11INSTALLATION
6. INSTALLING THE VALVE ASSEMBLY
For 2” fittings and greater, use a
control valve with flange fittings
The valve assembly consists of a pilot
and control valve. Installation of valves
should be in accordance with The Water
Supply (Water Fittings) Regulations 1999
and BS6700:1997 Para. 2.2.4
Operation
When the water in the tank drops below
the desired Open Level, Tanktronic will
send a signal to the pilot valve to open.
This relieves the pressure on the top
surface of the diaphragm, causing the
control valve to open. When the water
level has reached the desired Close Level,
Tanktronic sends a closing pulse to the
pilot valve, causing water pressure to build
on the diaphragm surface and close slowly.
The control valve can be mounted
horizontally outside the tank either at floor
level or above the tank water level. It can
also be positioned vertically in the rising
main (up to and including 150mm (6”) only).
A servicing valve must be fitted upstream of
the control valve. A servicing valve fitted
downstream of the valve is also recommended
to completely isolate the valve for maintenance.
It is recommended that a coarse particle
strainer (not supplied) is installed upstream
of the control valve to prevent debris entering
it unless the valve is mounted vertically.
Discharge into the tank – if an air gap is
required for back flow protection, the
discharge must be above the water level.
Prior to installation, all pipe work should be
flushed through to remove all debris.
Decide upon the best location for mounting
the valve assembly. Refer to the consulting
engineer’s plans as appropriate.
For 1½” or smaller piping,
use a screw-thread filling valve
Pilot
valve
Closing
speed valve
Control valve
Closing
speed valve
Pilot valve
Control valve
