Technical Specifications; General Description - IVAR PRV Manual De Instrucciones

The installation and commissioning of PRV device must be exclusively performed by qualified personnel in
accordance with the national guidelines and/or the relative local requirements. It is important that the present
instructions be followed in order to avoid damage to the system and/or personal injury.

Technical specifications

Working fluid: water; compressed air; neutral non-adhesive fluids; neutral gases
Max inlet pressure: 25 bar
Outlet pressure adjustment range: 1.5-6 bar
Factory setting: 4 bar
Max operating temperature: 70 °C
Strainer porosity: 0.5 mm
Size: see Fig. 1
Components (ref. Fig. 2)
1. Body
2. Inlet
Important. The strainer cleaning outlet must
NOT be used as outlet pressure gauge port!
The only available ports to fit the outlet
pressure gauge are the FRONT and the BACK
connections.

General description

Pressure reducing valves are mainly used upstream residential plants for the distribution of domestic water, and perform the following functions:
1. Reduce water pressure to the value required by the private supply pipe, in order to prevent component failures due to excessive pressure;
2. Stabilise outlet pressure, so to avoid uncomfortable supply fluctuations.
PRV pressure reducing valves are based on the opposite forces exerted by two elements on a compensated control valve: a spring (closing action) and
a diaphragm (opening action). The compensation stabilises the outlet pressure to the set value independently of the upstream value, thus eliminating
the risk of instability or fluctuations.
Installation and adjustment instructions
Preliminary operations. Flush and vent the piping network prior to PRV installation. Consider to install PRV in a place that can be easily accessed and
inspected.
Installation. Mount the pressure reducing valve according to the direction indicated on the device brass body. Do not install the device with upside-
down cartridge. Do not apply mechanical stresses. Consider that you will be able to turn the outlet pressure indicator at any time, so to make it visible
(Fig. 3a).
Warning! The installation of shut-off valves upstream and downstream PRV device is strongly recommended in order to make the device isolation
possible, and to allow easy flushing and maintenance operations. The installation of an in-line shock arrestor is also recommended to prevent
possible component failures. In case of aggressive water, consider to install a water treatment system upstream the pressure reducing valve.
Adjustment. To adjust outlet pressure setting, loosen safety screw A in Fig. 3b, then turn the adjustment selector towards "-" to decrease pressure
value, or towards "+" to increase it. Factory setting is 4 bar.
Fig. 4 represents the pressure loss generated by the pressure reducer into the circuit as a function of flow rate. The value of pressure drop that can
be read on the graph should be added to the pressure reduction imposed by the device setting.
Strainer cleaning
PRV pressure reducing valve features a strainer to block dirt upstream the private pipe inlet. It is advisable that the strainer is periodically checked to
make sure the device is still working properly. If the strainer is clogged, it can be cleaned as follows:
1. If shut-off valves have been installed upstream and downstream PRV, shut them off;
2. Remove the plug nut blocking the outlet 7 in Fig. 2, then connect a hose in its place;
3. Open the upstream shut-off valve;
4. Let dirty flow come out of the drain hose until water flows out completely clean (Fig. 5);
5. Shut off the upstream valve again;
6. Plug the outlet 7 in Fig. 2 with the nut;
7. Open both upstream and downstream shut-off valves.
3. Outlet
4. Adjustment selector
EN
Materials
Body: CW602N dezincification-resistant brass
Rubber parts: EPDM
Compatible with potable water
Comply with EN 1567
5. Outlet pressure indicator
6. Strainer
3/8
7. Strainer cleaning outlet
8. Pressure gauge port
300371-04-17