22 Installation, Operations & Maintenance Manual
Refer to “Installation with Suction Lift,” which outlines
limiting conditions if suction lift requirements are
anticipated.
The supply tank should incorporate a low-level
switch to cut off the pump motor before the suction
intake is exposed to air. Otherwise, the pump may
occasionally run dry.
Discharge Piping
The installation of an external Safety Valve is
recommended, since the pump’s internal relief
valve is not intended to protect the piping system.
Refer to “Setting the Relief Valve” in Section 3, for
further relief valve discussion. (Milton Roy offers a
complete line of back pressure and safety valves).
For satisfactory metering and capacity control,
the discharge pressure at the pump must be
50 PSI (3.5 Bar) minimum for the mRoy A and
70 PSI (4.8 Bar) minimum for the mRoy B.
Therefore, when the pump is to discharge into
an open system, a back pressure device must be
installed in the pump discharge line.
REMOTE HEAD SYSTEMS: DO
NOT INSTALL A BACK
PRESSURE SPRING IN DISCHARGE BALL CHECK CARTRIDGE
OF DIAPHRAGM HEADS WHICH ARE “REMOTE MOUNTED”
(NOT ATTACHED TO THE MAIN HOUSING). A SEPARATE
BACK PRESSURE VALVE MUST BE INSTALLED IN THE
SECTION 2 - INSTALLATION
Figure 15. Typical Piping and Instrumentation Diagram
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