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6
Gauges
Gauges for monitoring the pump’s working conditions
are recommended. These gauges should be placed
readable as close to the pump’s in- and outlet flanges
as possible. On standard pumps, series ACE there are
gauge connections for both in and outlet.
Pressure relief valve
All systems with screw pumps must be equipped with a
pressure relief valve installed immediately adjacent to
the pump.
This pressure relief valve is an integral part of the
Opti Line ACE to protect the system against excess
pressure.
When liquid is circulated through the valve it heats up in
proportion to the set pressure level and the percentage
of bypassed liquid. 100% bypass can only be tolerated
for less than about 3 minutes, 80 % bypass generally
for unlimited periods of time.
If more than 50% recirculation is anticipated, a value
specific to each application should be determined by
closely monitoring the pump body temperature.
If the pump is operating in line with a separate pressure
control valve (see fig. 9), the setting of the relief valve
should be high enough so as not to interfere with the
control valve. Likewise, if two pumps are operating in
parallel, the setting should be such that interference
between the two valves is avoided.
Pressure testing and flushing
The system must be flushed and pressure tested before
connecting the pump. If corrosive liquid, such as water
is used, the system must be thoroughly drained, dried
and protected against corrosion after having been
flushed.
10
Oil leakage may make the floor slippery
and cause personal injury.
EDU
Fig. 9 Pressure relief valve
Fig. 10 External control with pressure relief valve
Fig. 8 Gauges
