About The Gas Ballast Mechanism - EBARA EV-A Series Instruction Manual

6.3 About the Gas Ballast Mechanism

Note) The gas ballast mechanism is an option
IMPORTANT
*Condensable gas (water vapor, solvent mixed gas) can be prevented from being condensed inside
the pump by making the gas ballast valve "Open". Use gas ballast valve whenever you use such
gas, as it can elongate pump's life.
It is effective to keep the pump running about one hour with the valve open after pumping out
condensable gas like water vapor.
(Check appropriate running hours with the valve open as it varies depending on usage and
condition)
There are two types of gas ballast system. One is for air introduction and another one is for N2
introduction. Select either one of the system by the gas you use. If you pump solvent or the like,
contact one of our sales offices listed in the back regardless of its kind and amount. When you
pump flammable chemical, always introduce N2 through gas ballast system.
After large amount of condensable gas is pumped, such amount as liquidate even if the gas ballast
valve is open, run the pump around one hour with the pump inlet and valve open.
(Check appropriate running hours with the valve open as it varies depending on usage and
condition)
*The performance of gas ballast system will be different depending on the pump operating
temperature, the kind of condensable gas and its amount.
*Turn off the gas ballast valve when you do not use condensable gas.
Always use gas ballast mechanism (optional) when pumping condensable gases.
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.
Maximum supply pressure for N2 gas ballast is 0.05MPa.
Do not over pressurize as it may damage the pump.
Air gas ballast mechanism has a built in filter to protect the pump from foreign materials in the
air. When pump is used in dusty environment the filter may get clogged and reduce ballast gas
flow into the pump which will cause a failure to prevent condensation in the pump. Install the
pump in clean environment.
PM10U
CONFIRMATION
P.37
EBARA
CORPORATION