Use and operation – VACUUBRAND RC 6 User Manual
Page 23
page 23 of 59
Method of operation:
The RC 6 is a four-stage vacuum pump consisting of an oil-sealed, two-
stage rotary vane pump with a series-connected two-stage diaphragm
pump. The two units are mounted on a common shaft and are connected
directly to the drive motor. The dry-running compressor-type diaphragm
pump evacuates the headspace of the oil reservoir of the rotary vane
pump, thus considerably increasing the latter’s maximum vapor inlet
pressure and chemical resistance.
With the gas ballast valve closed, the rotary vane pump shuts off vacuum
tight. This, in turn, prolongs the intervals between oil changes and im-
proves corrosion resistance. The oil system incorporates an oil pump;
this forced-lubrication system ensures an adequate supply of oil to the
pump unit even at high inlet pressures. A mechanical retaining valve in
the oil system prevents oil suck-back into the vacuum system.
The oil mist filter of the rotary vane pump removes 99 % of the oil mist. If
an exhaust waste vapor condenser is fitted (available on request), the va-
pors handled by the pump can be condensed to a large extent and either
be recycled or disposed of in accordance with regulations.
Use and operation