Specifications

ENGINEERING DATA / SIZING
INSTALLATION RECOMMENDATIONS
AND REQUIREMENTS
VERTICAL INSTALLATIONS
Avoid mounting valves 6" and larger in a vertical discharge
position (valve stem horizontal or cover pointed sideways). If
y
our installation requires this mounting position consult the
factory or specify at time of order.
ISOLATION SHUT-OFF VALVES
Butterfly or similar type valves should be installed in the line
upstream and downstream of the automatic control valve to
allow for maintenance service. Installing isolation valves will
allow you to perform maintenance service without draining the
system or exposing service personnel to line pressures.
SPECIAL CONSIDERATIONS
FLOAT VALVES
– Installing valves over open tanks should be avoided due
to possible servicing problems.
– Install stilling wells around floats to protect them from
turbulance.
– Remote mounted float controls should be connected to
the main valve with
3
/8" size tubing.
SOLENOID VALVES
– Electrical wiring should conform to NEMA codes to
assure proper valve operation and longevity.
RATE OF FLOW VALVES
– A butterfly isolation valve cannot be installed directly to
the valve inlet flange, as the disc will contact the orifice
plate. A gate or ball type valve can be used or the isola-
tion valve can be installed further upstream.
ALTITUDE VALVES
– Install the valve as close to the tank as possible, a maxi-
mum of 40 pipe diameters to assure accurate control.
– A sense line is required to connect the altitude control to
the tank. To provide accurate reading of head pressure,
the line should connect at the base of the water column.
Minimum sense line size is
1
/2". A shut-off valve should be
installed in this line for service and start-up.
VALVE SIZING — PRESSURE REDUCING
Selection of the correct size pressure reducing valve is a rela-
tively simple process. Criteria for selection is minimum flow,
normal flow, maximum flow and pressure drop across the
valve. Following are explanations of the three types of PRV
installations. These also apply to any functions combined with
the reducing function, such as reducing/check and reduc-
ing/solenoid valves.
SINGLE VALVE INSTALLATION
A single reducing valve can be applied if operating flow,
requirements are within the capacity of one size valve, and
pressure drop is outside the Cavitation Zone.
1. Select the valve size from SIZING CHART that is within the
range of low to high flow. (Consider requirements of lowest
demand equipment.)
2. Check Pressure Drop (inlet-outlet) to insure that desired out-
let pressure is above the recommended lowest outlet setting
to avoid cavitation conditions. (Check Cavitation Chart page 21.)
PARALLEL INSTALLATION
If flow requirements fall outside the capacity of a single valve,
an additional smaller valve installed in parallel may be
required. In parallel installations, the larger valve handles the
requirements for maximum flow down to its low flow capacity.
The small valve extends to the sum of the maximum flow of
both valves.
1. Select the valve size combinations from SIZING CHART that
is within low to high flow system range.
2. Check Pressure Drop (inlet-outlet) to confirm desired outlet
pressure is above index psig., or check Cavitation Chart.
SERIES INSTALLATION
If pressure drop requirements cause the outlet pressure to be
below the index psig., or fall in the Cavitation Zone, then two
valves in series may be required. Each valve will function out-
side the cavitation zone to safely drop the high inlet pressure,
in two steps, to the desired outlet pressure. Valve size is
based upon the Minimum - Maximum flow ranges previously
explained.
ISOLATION VALVES
30