5.
Installation Guidelines:
Note:
Before implementing any installations observe the 'Important Safety notes” in
section 2. Referring to the Installation and Maintenance Instructions, name-plate and
Technical Information Sheet, check that the product is suitable for the intended
installation.
5.1 Fitting:
The valve should always be fitted in a horizontal pipeline with the main diaphragm chamber
below the line (figure 7). To meet the high capacities or widely varying loads or where stand-
by facility is required, two or more valves may be used in parallel (figure 6). For pressure turn
down in excess of 10 to 1 consideration should be given to using the two valves in series. To
avoid turbulence between the two pressure reducing valves, the distance must be
equivalent to atleast 50 pipe diameters. To ensure adequate drainage of the space between
the two pressure reducing valves a trap set should be fitted as shown in figure 8.
Figure 6: Recommended installation of FMPRV41
*This is a typical representation of Forbes Marshall Pilot Operated Pressure Reducing Valve
10
Forbes Marshall Pilot Operated Pressure Reducing Valve
