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5. PRECAUTIONS
5.1 Clogging of Filter Element
Clogging of the filter element will raise the pressure in the pump and
may damage the pump parts or the filter element. Therefore, when using the
filter element in the following application, be sure to mount a pressure
monitor (optional) to monitor the pressure.
① When the pump is used for continuous evacuation at a high suction pressure
or continuous pumping of high temperature gas
The pump temperature rises and the oil viscosity lowers, tending to cause
clogging. In this case, a large volume of oil, discharged from the exhaust
port of the pump, will the trapped by the filter, but if the pump is operated
under the above operating conditions for an extended time, the oil deposited
on the fine fiber of the filter element will form oil film, leading to
clogging.
② When the pump is used to pump liquid with high viscosity or fine powder
at ambient temperature, it will be deposited on the fiber of the filter
element, leading to clogging.
③ When reaction products are generated
5.2 Pressure Relief Valve
This device is designed to operate when the pressure in the pump exceeds
the maximum continuous operating pressure of 0.03 MPa (0.3 kg/cm
2
) (gauge
pressure). If this valve is activated, the oil mist discharged from the
pump will not be trapped by the filter element, but will be discharged
directly through the exhaust port of the oil mist trap.
If this happens, replace the filter element with a new one.
5.3 When the pump is used continuously at high intake pressure
If the pump is operated continuously at a high intake pressure (6500 Pa
or more) for an extended time, the pump temperature will rise and the oil
viscosity will lower. This increases the amount of oil mist (including fine
oil drops) discharged through the exhaust port of the pump and tends to clog
the fitter element. Foreign matter sucked into the pump during evacuation
and the sludge generated by deteriorated oil can also be a cause of the
clogging of the filter element.
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