Product Overview

Installation
1) Turn all the faucets on before installing the pressure reducing
valve, to flush the system and expel any air remaining in the
pipes.
2) Install shut-off valves upstream and downstream to facilitate
maintenance operations.
3) The pressure reducing valve may be installed on either vertical
or horizontal pipe. However, it must not be installed upside
down.
4) Close the downstream shut-off valve.
5) Remove the factory-installed UV protective cover before
adjusting the setting. Pull the tabs open before lifting up.
Reinstall after setting the pressure for UV protection if needed.
6) This mechanical pre-adjustment system, with the operating
knob and pressure indicator visible from both sides, allows
the pressure reducing valve to be set to the required value in
the system prior to installation. The pressure indicator features
incremental step operation, where the pressure can be adjusted
continuously with the value displayed at 15 psi increments.
7) Set the pressure using the operating knob on the
upper part of the valve. The pressure reducing
valves are factory set to a pressure of 45 psi.
8) Because the pre-adjustment dial displays in 15 psi
increments, the optional downstream outlet pressure gauge
can be used to show the exact outlet pressure, which is
especially useful for applications requiring this precision.
9) After installation, the internal mechanism will automatically
control the pressure, until the set value has been reached.
10) Slowly reopen the downstream shut-off valve.
Installation recommendations
1. Outdoor installation
Pressure reducing valves should not be installed outside
the building unless properly protected from freezing and the
weather.
2. Each 535H PRV comes with a snap-on protective
cover which is designed to resist UV rays,
for outdoor locations, and to provide a significant
level of protection against dust, dirt and water.
It does not protect against freezing; do not
mount the valve in locations where it may freeze.
Protective cover not approved for use in plenum
installations.
3. Water hammer
Water hammer is a common reason for pressure
reducing valve failures. Specific devices should
be installed to absorb water hammer for systems with this risk.
Troubleshooting
System failures are not always caused by the pressure reducing
valve. Most frequently:
1. Increased downstream pressure in the presence of a
water heater
If the downstream pressure
increases beyond the desired
setting due to an inline water
heater, install an expansion tank
between the pressure reducing
valve and the water heater to
absorb the increased pressure,
caused by water expansion from
heating.
2. The pressure reducing
valve does not maintain downstream setting value
If the pressure reducing valve does not maintain the downstream
setting, it most likely is due to impurities acccumulating on the
valve seat, causing unnecessarry flow to pass-through,
increasing the downstream pressure. Proper maintenance and
cleaning of the removable cartridge is recommended.
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Installation
1) Turn all the taps on before installing the pressure reducing
valve, to ush the system and expel any air remaining in
the pipes.
2) Install shut-o valves upstream and downstream to
facilitate maintenance operations.
3) The pressure reducing valve may be installed on either
vertical or horizontal pipe.
However, it must not be installed upside down.
4) Close the downstream shut-o valve.
5) This mechanical pre-adjustment system, with the operating
knob and pressure indicator visible from both sides, allows
the pressure reducing valve to be set to the required value
in the system prior to installation. The pressure indicator
features incremental step movement, so that the pressure
can be adjusted continuously and the value displayed at
0,5 bar increments.
6) Set using the operating knob on the upper part of the
device. The pressure reducing valves are factory set to a
pressure of 3 bar.
7) Given the presence of the pre-adjustment function, the
presence of the downstream pressure gauge, showing the
eective pressure value in the system, must be assessed
in accordance with the application.
8) After installation, the internal mechanism will automatically
control the pressure, until the set value has been reached.
9) Slowly reopen the downstream shut-o valve.
Installation recommendations
1. Installation below ground
Installing pressure reducing valves
below ground is not
recommended, for three reasons:
- there is a risk of the reducing valve being damaged by frost
- inspection and maintenance is dicult
- reading the pressure gauge is dicult.
2. Outdoor installation
Pressure reducing valves should not be installed outside the
building unless properly protected from frost and the weather.
3. Water hammer
This is one of the main causes of faults in pressure reducing
valves. It is best to t special devices to absorb water
hammer when installing pressure reducing valves in at-risk
systems.
Troubleshooting
Certain types of fault, which are generally due to faulty design of
the system, are often wrongly attributed to pressure reducing
valves. The most frequent cases are as follows:
1. Increased downstream pressure in the presence of a
water heater
This problem is due to
heating of the water caused
by the water heater. There is
not relief of the pressure
because the reducing valve is
rightly closed. The solution is
to install an expansion vessel
(between the water heater
and the pressure reducing
valve) to “absorb” the
pressure increase.
2. The pressure reducing valve does not maintain its
setting value
In most cases this is the result of impurities that deposit on
the valve seat causing leakage with a resulting increase in
pressure downstream.
It is advised to carry-out maintenance and cleaning of the
removable cartridge (see maintenance).
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HOT WATER
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Application diagrams
Domestic water system