GA01300_0902 - 04/2006 - © by Leybold Vacuum
9
Description
After the oil has flowed out from the reservoir and when the valve plate rests
on the valve seat, air follows in, which vents the pump chamber and forces
the valve disc (4/6) against its seat.This effectively prevents backstreaming
of oil or oil vapours. The anti-suckback valve (2/3) operates independently
of the operating mode of the pump, i.e. also with gas ballast.
All aluminium surfaces of the TRIVAC BCS are surface protected and thus
particularly capable of resisting aggressive chemicals. A thermocouple has
been incorporated in the pump which is used in connection with the optio-
nal electrical monitoring facility. The thermocouple may be accessed
through the built-in connector (7/8).
Via a second oil fill opening, an exhaust line may be connected for venting
the oil case when using the inert gas purging facility.
Fig. 3 Schematic of the lubricating system
Fig. 4 Hydropneumatic anti-suckback valve
Key to Fig. 3
1
Accessories
2
Bearings
3
Non-return valve
4
Pump chamber of the TRIVAC
5
Oil reservoir
6
Oil pump
Key to Fig. 4
1 Oil reservoir
5 Valve seat
2 Spring
6 Valve disk
3 Control piston
7 Gas inlet
4 Anti-suckback piston
Surface protection
Thermocouple
