SPX Johnson Pump CombiPrime V, Инструкция по эксплуатации

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32 Commissioning
CV/EN (1009) 5.3
4.6 Adjusting the air-inlet valve
The air-inlet valve (1650) serves to admit small quantities of air into the self- priming
system. The vacuum pump has been designed to pump a large quantity of air. After the
suction phase, the vacuum pump functions as liquid pump. However, in principle it is not
designed to only pump liquid. By adding a small quantity of air through the air-inlet valve,
it is possible to avoid problems. After the pump has been started with closed air-inlet
valve, the valve is adjusted as follows:
1 When the suction phase is over and the centrifugal pump maintains the liquid flow on
its own, the pump will start making a crackling noise.
2 Slowly open the air-inlet valve until the crackling stops.
3 Leave the valve in this position and secure it with a lock nut. The valve is now properly
adjusted. Provided the system conditions do not change, the pump can be
reconnected after a break without having to readjust the valve.
4.7 Mechanical seal
• A mechanical seals or the lip seals may never show any visible leakage.
4.8 Pump in operation
When the pump is in operation, pay attention to the following:
• The pump may never run without liquid in the service liquid tank or the float-controlled
de-aerator.
• Never use a stop valve in the suction line to control pump output. The stop valve
should always be fully opened during operation.
• Check whether the absolute inlet pressure is sufficient, to prevent vaporization in the
pump.
• Check whether the pressure difference between suction and delivery side
corresponds with the specifications of the pump's duty point.
4.9 Noise
The noise production of a pump depends to a great extent on the operating conditions.
The values stated in paragraph 10.5 "Noise data" are based on normal operation of the
pump, driven by an electric motor. In case the pump is used outside the normal operation
area, as well as in case of cavitation, the noise level may exceed 85 dB(A). In that case
precautions should be taken, like building a noise-barrier around the unit or wearing
hearing protection.