Proper Venting
The Vacuum pump must be properly vented to ensure all oil is removed from the pumping chamber before the
pump is turned off. Also, the suction line must be properly vented to ensure oil does not migrate into the process
chamber.
Recommended vent valve sizes:
KT-150 .75 inch
KT-300 1.0 inch
KT-500 1.5 inches
KT-850 2.0 inches
The vent valve must be open for at least 10 seconds before the pump is turned off to remove all oil from the pumping
chamber.
Discharge Manifolding
Discharge manifolding should be sized and designed to prevent the following:
A. Return of oil mist condensate to the pump
B. Oil loss
C. Oil mist in the discharged gas.
Under the normal conditions, the diameter of the manifolding should not be less than the diameter of the pump
connection and pipe length should be kept to a minimum.
The installation of a Kinney oil mist eliminator on the discharge is recommended for all applications, (as shown in
Figure 4). Oil which collects in the eliminator should be returned to the pump. The optional oil return kit will drain
allow oil to back into the separator housing when the pump is operating at low pressure or when the pump is
stopped. If the pump is to operate continuously, or normal operating pressure is between 10 torr (13 mbar) and 150
torr (200 mbar), the oil return should be connected to the gas ballast as shown in Figure 3. Over 150 torr (200 mbar)
the oil return should be connected to the pump inlet.
It may be necessary to pipe the pump exhaust fumes away from the pump area, such as outdoors. If this is done,
the piping must be arranged to prevent line condensation from returning to the pump. A flexible connector should be
fitted in the discharge line to provide freedom for the vibramounts.
Cooling Water
The cylinder cooling water jacket is shipped dry, with the drain plugs removed. They are tied to the pump in a small
cloth bag. Replace the plugs in the positions shown in Figure 1 and fill the water jacket before starting the pump.
If an optional water flow modulating valve (Water Miser) is fitted, the cylinder may take 20 minutes or more to fill. The
delay can be avoided by lifting the spring to open the valve. For installation of the valve see Figure 6.
Failure to ensure that the cooling water jacket is filled before starting the pump will result in localized over-heating of
the pump and cause extensive damage.
For installations requiring starting at ambient temperatures lower than 60°F (16°C), electric heaters should be
installed in the water jacket. (See Figure 5.)
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