Dover PSG BLACKMER MRLX4B Anweisungen für Installation, Betrieb und Wartung - Seite 6
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FLUSHING THE PUMP
NOTICE:
If flushing fluid is to be left in the pump for an extended
time, it must be a lubricating, non-corrosive fluid. If a
corrosive or non-lubricating fluid is used, it must be
flushed from the pump immediately.
1.
To flush the pump, run the pump with the discharge valve
open and the intake valve closed. Bleed air into the
pump through the intake gauge plug hole or through a
larger auxiliary fitting in the intake piping. Pump air for 30
second intervals to clean out most of the pumpage.
2.
Run a system compatible flushing fluid through the pump
for one minute to clear out the remainder of the original
pumpage.
3.
To remove the flushing fluid, follow step 1 above.
NOTICE:
After flushing the pump some residual fluid will remain in
the pump and piping.
NOTICE:
Properly dispose of all waste fluids in accordance with
the appropriate codes and regulations.
PUMP RELIEF VALVE
WARNING
Internal bypassing of liquid elevates liquid temperature.
Use the internal bypass valve for brief periods only and
at differential pressures below 125 psi (8.6 bar).
extended periods or higher pressures, the internal
bypass port must be plugged and the liquid returned
back to the source.
The ML4 Series pump is offered with an optional relief valve
assembly which is bolted onto the pump casing. The valve
may be used as an internal relief valve, or as an external
bypass, piped back to the storage tank (see Figure 4). Its
purpose is to protect the pump or pumping system from
excessive pressure. The valve is not meant to be used for
prolonged recirculation.
When pumping highly volatile liquids under a high suction lift,
and cavitation or starving of the pump exists, partial closing of
the discharge valve will result in excessive noise in the relief
valve. Plumbing the relief valve so flow is directed back to the
storage tank is recommended when operating under these
conditions.
OPERATION
RELIEF VALVE SETTING AND
ADJUSTMENT
The relief valve pressure setting is marked on a metal tag
attached to the valve cover. Set the relief valve at least 15 -
20 psi (1.0 - 1.4 Bar) higher than the operating pressure, or
the external bypass valve setting (if equipped).
For
Hazardous pressure
can cause personal
injury or property
damage
Hazardous or toxic
fluids can cause
serious injury.
DO NOT remove the R/V Cap OR adjust the relief valve
pressure setting while the pump is in operation.
1. To INCREASE the pressure setting, remove the relief
valve cap(1), loosen the locknut(3), and turn the adjusting
screw(2) inward, or clockwise. Replace the valve cap.
2. To DECREASE the pressure setting, remove the relief
valve cap(1), loosen the locknut(3), and turn the adjusting
screw(2) outward, or counterclockwise. Replace the valve
cap.
Refer to the individual Blackmer pump parts lists for various
spring pressure ranges. Unless specified otherwise, pumps
are supplied from the factory with the relief valve adjusted to
the mid-point of the spring range.
106-A00
Page 6/20
Figure 4 – Relief Valve
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Relief valve cap is exposed to pumpage
and will contain some fluid