Technical Description
Lubrication
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Dual Stage Rotary Vane Pumps User Manual/ 87-900-937-01(L) 53/140
Lubrication
The pump’s lubricating system is force-feed type.
Oil circulation is obtained by means of a gear pump connected to the
rotor shaft.
The oil is drawn through a gauze filter to prevent any foreign bodies
from entering the pump.
Shunt-mounted on the delivery line is a hydraulic piston which,
besides actuating the anti-suckback device (see ANTI-SUCKBACK
DEVICE), also regulates pressure by discharging excess oil flow
directly into the tank.
The required flow of oil under pressure passes through ducts that are
drilled in the walls of the pump and lubricates the bushings and the
inside parts.
Vacuum Seals
A special feature of this pump is the low number of gaskets that are
employed.
The seals in the circuit are obtained by means of VITON gaskets.
The careful surface finish of the various parts of the pump means
that vacuum sealing of the functional block is ensured by the film of
oil separating metal surfaces. Sealing of the rotor shaft is guaranteed
by a rotating gasket with dust-guard lip.
The suction flange and duct are sealed by mean of OR gaskets.
Gas Ballast Valve
When the pump sucks in vapors, these condense during compression
and mix with the oil, forming an emulsion (an aqueous vapor, for
example) or a solution (organic solvent vapors, for example).
A number of problems arise from this, such as the impossibility of
obtaining high vacuums, the alteration of the properties of the oil,
could cause scaling on parts of the pump.
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