SRV630 are designed for pumping of inert gases in the range of rough vacuum, between
atmospheric pressure and end pressure of the pump.
When removing condensable vapours, a gas ballast valve (or 2) must be installed.
SRV630is a single-stage, oil-sealed rotary vane pump.
The anti-suckback valve, gas ballast valve, exhaust filters, oil feedback
circuit, oil cooler and thermal switch are integrated functional elements of
the SRV630.
The rotor mounted eccentrically in the pump cylinder has three vanes which divide
the pump chamber into several compartments. The volume of each change
periodically with the rotation of the rotor.
As a result of enlargement of the pump chamber that is open in the direction
of the intake port, gas is sucked in. The gas passes through the dirt trap and
the open anti-suck back valve and enters the pump chamber. As the rotor rotates
further, the vane separates part of the pump chamber from the intake port. This
part of the pump chamber is reduced, and the gas is compressed. At slightly
above atmospheric pressure the gas is expelled from the chamber via the exhaust
valves.
Oil injected into the pump chamber serves to seal, lubricate and cool the pump.
The oil entrained with the compressed gas is coarsely trapped in the bottom part
of the oil casing. Then fine filtering occurs in the 8 integrated exhaust filter
elements.
The oil trapped in the exhaust filters is returned to the stator via an oil return
line. To prevent gas flowing at atmospheric pressure from the oil reservoir into
the intake port, the oil return line is controlled by a float valve.
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