Victor Pumps R-Serie Betriebs- Und Wartungsanleitung Seite 30

R
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3. STARTING
3.1 Before starting for the first time, pour a little of the
liquid to be pumped into the casing to help
self-priming. Check by hand that the pump can
rotate freely.
3.2 Check that all the valves in the suction and
delivery lines are open.
Figure 1 - Direction of rotation
3.3 Start the motor and check the direction of
rotation. Looking from the shaft end if the right
hand port is chosen as the suction port, the pump
shaft must rotate clockwise.
A : The direction of pump and the position
TTENTION
of the casing can not be inverted or changed
afterwards If the pump is fitted with a by-pass
relief valve, the cover with the adjusting screw
must be on the suction port side.
3.4 Engine-driven pumps are generally fitted with
industrial clutches. Start the engine with the clutch
disengaged and bring gradually up to near
running speed. Carefully engage the clutch and
accelerate the engine until the required speed is
reached.
4. SHAFT SEAL
4.1 There is no rotating seal present
5. TROUBLE SHOOTING
5.1 PUMP DOES NOT PRIME
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Operating Instructions
a) Wrong direction of rotation (see section
3.3).
b) No liquid in pump casing to create a seal
(see section 3.1). The vacuum gauge needle
hardly moves.
Should the pump self-prime at every start and has
difficulty in priming it is recommended to fit either
a goose neck (curve upwards and reverse curve)
or a foot valve in the suction line to ensure that
there be always liquid in the pump.
c) Closed valve in the suction line, suction line
or filter clogged. Vacuum gauge reading is high.
Check the suction line thoroughly.
d) Air leaks in the suction line. Check that all
flange screw threads and gaskets are airtight.
e) Trapped air in the delivery line (see section
2.8). Check that all valves are fully open. If
necessary, let the air out by venting the delivery
line.
f) Excessive suction lift. Reduce static suction
lift.
g) Rotation speed too low. If the liquid has a
viscosity less than 20 mm²/s (cSt), do not run at a
1
speed less than /
3
h) By-pass blocked in open position by
impurities. Clean the relief valve and its seat.
5.2 LOW CAPACITY
a) Rotation speed too low. Check that the
speed corresponds to that necessary to obtain the
required capacity.
b) Suction line or filter are obstructed. The
vacuum gauge reading is high. Metallic cavitation
noise.
c) Air leaks in the suction line. The vacuum
gauge and the pressure gauge oscillate. Check
connections, threads, gaskets, welds etc.
N : Air leaks in the suction line are very difficult
OTE
to detect. But there is no leakage if there is
vacuum in the suction line.
d) Pressure of by-pass relief valve is set too
low causing some liquid to recycle. Tighten
by-pass adjusting screw (see section 6.1). The
pressure gauge will show a higher pressure.
e) Suction line not sufficiently immersed in
liquid causing air to enter suction line. The
vacuum gauge oscillates.
f) Liquid viscosity too high. The vacuum gauge
reading is very high. Metallic cavitation noise.
Reduce the viscosity of the liquid by heating or
increase the diameter of the suction line.
R-9100699-2E
06/10/99
of the nominal speed.