Displacement/volumetric flow rate
Over the relevant pressure range, a GVS A pump operates at constant motor
speed (rotations per minute) and since the compression chambers have fixed
dimensions, the same volume of air is pumped from inlet to outlet with falling
pressure level. Over the relevant pressure range, this makes the volumetric flow
rate practically independent of the vacuum level. It is the expression of the flow
rate inside the piping at the governing vacuum level (in actual m³/h) and is
always higher than the standard flow rate (in Nm³/h).
Standard flow rate
Although the volumetric flow rate remains practically constant with decreasing
(absolute) pressure, the number of molecules in that pumped volume is not. By
definition: the deeper the vacuum, the lower the number of molecules in the
same volume. This means that the mass flow will decrease with decreasing
(absolute) pressure. A flow rate must be stated at a certain vacuum level when
using this denotation.
3.2. Overview
The vacuum pumps are single-stage, oil-sealed and air-cooled rotary vane
vacuum pumps driven by an electric motor. GVS 100A up to GVS 300A are also
available without electric motor. The GVS 470A and GVS 630A are belt driven.
The pumps have been specifically designed to work with clean air, inert gas or
small amounts of water vapour. The ambient temperature shall be between 12 °C
and 40 °C.
For applications with high oxygen concentration, O
2
- versions are available
(GVS 60A up to GVS 630A).
Note:
Lower temperatures are possible with reduced viscosity oil. This temperature
range is defined by Pneurop for performance conformity testing, but 8 °C is the
critical point from the motor starting view point.
Description
12/2021 - ©Atlas CopcoPage 166996022430_C
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