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4.3 Shut down Operation
Close shut off valve (A), open pump vent valve (B), then turn off power switch of
the pump(see Fig 4). If stopping the pump by no opening pump vent valve, the oil will
be filled inside the pump cylinder within several minutes. This may cause back flowing
oil to the vacuum vessel. For next operation, restarting the pump will be difficult
because of not so smooth rotation, thermal protector operating, motor firing by over
loading.
When stopping the pump operation by electric stoppage, close shut off valve (A) quickly
and then open pump vent valve (B).
Firing hazard. As the surface of the pump body is higher temperature(70
~80°C) during operation, do not touch it until cooled down after
stopping the pump.
① After closing shut off valve (A) and opening pump vent valve (B), stop
the pump. If this procedure is not performed, pump oil must be filled
inside the pump. It may cause difficulty on restarting or damage the
pump, also back flowing oil to the vacuum vessel.
② If the shut off valve (A) is not closed for shut down operation, this
may cause air leakage through inside the pump to the vacuum vessel.