EBARA EV-A Series Instruction Manual page 11

P.11
CONFIRMATION
Always use gas ballast mechanism (optional) when the pump needs to exhaust solvent gas and
water vapor.
Air gas ballast mechanism has a built in filter to protect the pump from foreign materials in the
atmosphere. When pump is used in dusty environment the filter may get clogged and reduce
ballast gas flow into the pump which causes a failure to prevent condensation in the pump.
Install the pump in clean environment.
Maximum supply pressure for N2 gas ballast is 0.05MPa.
Do not over pressurize as it may damage the pump.
When using gas ballast valve, while the beginning operation of which the pump is still cold, "gas
ballast capability" cannot be fully performed. If it is necessary to exhaust water vapor and other
condensable gases, warm-up the pump enough (more than 1 hour after running) and use gas
ballast mechanism. While the pump is still cold, "gas ballast capability" cannot fully perform and
condensable gas (eg, solvent gas) condenses inside the pump of which may lead to the pump
stop.
When the pump stops and the gas ballast valve still remains "open" state, air is introduced from
the gas ballast valve into the pump. This cannot keep vacuum condition of the pump. If it is
necessary to keep vacuum of the pump and/or equipment, attach shut off valve at the top of the
pump inlet to hold vacuum condition and shut it off before the pump is stopped.
When condensable gas such as water vapor is pumped, please keep it running for about 1 hour
opening the inlet port. There is a possibility of pump failure arising from corrosion or other factors
when condensed moisture, etc. remains inside the pump.
The condensable gas, which isn't condensed in the pump, might be condensed in the exhaust
piping. Take care of the condensate not to move back into the pump.
<Notice>
Please fill out Return Notice Form attached end of this manual and provide necessary
information before returning the product.
Dry out pump inside before returning the product if it was used to pump condensable gases.
For safety reasons, replace remaining gases with N2 (nitrogen) completely and seal inlet and
outlet port with blank off caps prior to returning the pump for repair/overhaul service if the pump
was used to pump toxic gases.
EBARA
CORPORATION
PM10U