5
Pipework upstream and downstream of the pressure reducing valve shall be supported in accordance
with the manufacturer’s instructions, AS/NZS 3500 along with any other local authority requirements,
to avoid the creation and transfer of vibration and/or noise into the installation.
The inlet strainer of the pressure reducing valve shall be periodically checked and cleaned, to minimize
any partial or complete blockage which may limit the flow rate from the valve and/or create noise.
System flushing, cleaning and disinfection of the pipework to which the valve is installed shall be
performed by suitably qualified persons in accordance with the system component manufacturer’s
instructions, AS/NZS 3500 along with any other applicable local authority requirements. Exceeding
the maximum stated chemical concentrations and/or duration of exposure may negatively
impact on the performance of the system and/or components installed such as the pressure
reducing valve. Chemical dosed products must be chemically compatible with materials used for
the construction of the pressure reducing valve, specified in its technical documentation.
Installation below ground
If installing the 5335 series valve underground, please ensure that steps are taken to protect the
valve from becoming frozen in frost-prone areas.
Please allow yourself sufficient space to remove the cartridge should maintenance be required.
The reading of a gauge for setting purposes may be difficult and an alternate means of checking
downstream pressure may ne necessary.
Water hammering
This is one of the main problems which may affect pressure reducing valves. It is best to fit
special devices to absorb water hammering when fitting pressure reducing valves in systems at risk.
WARNING:
If it is
critical
to maintain the downstream pressure setting to protect equipment, as
a safety measure, we recommend that a pressure, or safety, relief valve is installed
downstream of the pressure reducing valve.
Setting
1. Flush the system.
2. Install the pressure reducing valve in any position either vertically or
horizontally, not upside down, paying attention to the “direction of flow”
indicator on the body of the valve.
3. Caleffi 5335 series pressure reducing valves are factory set at 500 kPa.
4. If required, reset the pressure by turning the screw on the top of
the plastic cover. Turn it clockwise to increase the pressure and
anticlockwise to decrease it.
Maintenance
The reducing valve must be checked and serviced in compliance with applicable regulations. Even
when installed, commissioned and serviced properly, the reducing valve’s internal components are
subject to normal wear and tear, which may result in leaks and other malfunctions. We advise that you
check that it is in good working order and service and clean the cartridge at least every 12 months.
Proceed as follows for periodic cleaning of the strainer and inspection of the cartridge:
1 Turn off upstream water supply to the pressure reducing valve and open an outlet downstream
to relief pressure
