87
6 INSTALLATIONS WITH PARALLEL PRVS
Pegasus2 can be used in certain situations where there are two Pressure Reducing
Valves installed in parallel. At any time, one PRV takes the majority of the flow, but the
PRV being used is regularly swapped over. Alternating use of the units keeps both PRVs
exercised.
An example application is illustrated below. The Pegasus2 is operating in a standard
configuration (without use of the ‘latch’ solenoid). A Hydroswitch unit (available from
HWM) controls a latching solenoid (external to Pegasus2). The Hydroswitch itself is
controlled by the Pegasus2 unit.
Note: For this type of installation, the Hydroswitch must be connected to an interface
within the Pegasus2 Control box.
To successfully use Pegasus2 to change over from the PRV currently in use to (use and
control) the alternative PRV, the changeover should be timed to occur when the water
flow is expected to be minimal, and the outgoing pressure is also low. (Typically, this will
be during the night). After changeover, as demand increases, the old PRV makes
minimal contribution to the combined flow. The Pegasus controls the new PRV, which
becomes the dominant source of water flow.
To Next Page
Loading...
