Operating manual Pneumatic double diaphragm pump ZIP52 (PF Eco) Finishing
7 Operation
Order number 2332848 | Edition 08/2020
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7. Start work process.
7.3.1 Pump Shaking / Air Suctioning
If the pump speeds up suddenly and starts to shake, there is no lacquer left inside the device
and the pump is sucking in air. In this case, more lacquer must be supplied.
If enough lacquer is available and the pump still shakes, the suction filter is clogged and
must be cleaned.
Info
In case air accidentally flows into the pump suction inlet, the air pressure must
immediately be reduced to avoid the pump working at an excessive speed.
7.3.2 Product Pressure and Atomizing Air Pressure
The aforementioned values for the product pressure (1-1.5 bar) and atomizer air pressure
(1.5-2 bar) should be regarded as guideline values, as the pressure always depends on the
properties of the lacquer used, in particular its viscosity. If paints or other very liquid
products are used, the product pressure must be set very low (approximately 0.5 bar or
lower).
On the other hand, highly viscous lacquers require a pressure as high as 3 bar or even higher.
The atomizing air pressure must be set to 1–2.5 bar, depending on the lacquer
characteristics. To obtain perfect atomization and to avoid spray mist, the lowest possible
atomizing air pressure must be used. In some cases, the spray gun must be provided with a
very low product pressure and a very high atomizing air pressure. Carefully choose the
appropriate atomizing cap for the spray gun.
7.4 PRESSURE RELIEF / WORK INTERRUPTION
The pressure must always be relieved:
– after the spraying tasks are finished,
– before servicing or repairing the system,
– before carrying out cleaning tasks on the system,
– before moving the system to another location,
– before something needs to be checked on the system,
– before the nozzle or the filter is removed from the spray gun.
The components for pressure relief on a CE-compliant spraying system include:
– Outlet equipment (return valve) mounted between pump and spray gun.
Process for relieving pressure
1. Close the product delivery valve or any other device installed on the delivery line (such
as outlet valves or spray guns).
2. Close the air cut-off valve. Relieve the pressure in the product line, by opening the return
valve (if installed) or the dispensing device (valve or spray gun).
3. Close and secure return valve and dispensing device.
