Hoefer VP200 - Manual (Page 15)

The VP200 Vacuum pump as a
component in other systems
The VP200 Vacuum Pump can be used for any
application in which the requirements are within
the stated pump ratings (see pump specifications,
page 3) and in which the pumped gases are
compatible with the following materials:
Component Wetted part
Housing cover insert PTFE carbon reinforced
Head cover ETFE carbon fibre reinforced
Diaphragm clamping disc ETFE carbon fibre reinforced
Valve FFKM
Diaphragm PTFE
Inlet/outlet PTFE carbon reinforced
Hose PTFE
Fitting ETFE / ECTFE
Abbreviations
ETFE: Ethylene/Tetrafluoroethylene
PTFE: Polytetrafluoroethylene
FFKM: Perfluoro elastomer
ECTFE: Ethylene/Chlorotrifluoroethylene
Use of gas ballast and handling
condensible vapors
Operate the pump with the gas ballast valve
open if conditions are such that the pumped
vapors are likely to condense. Allow the pump
to reach its operating temperature by turning it
on approximately 15 min. before introducing the
condensible vapor.
Do not introduce any gas through the gas ballast
valve that could create an explosive mixture.
Inert gases are a good choice. Continue to run
the pump at atmospheric pressure after isolating
the pump from the condensible vapors to purge
the pump before turning it off.
•
p7
Fig 2. Gas ballast valve in the
open position when cap is
pointing towards the labelling
“GB”.
Note: The pump’s capability to
pull a vacuum is reduced with
the valve open. Also, opening
the gas ballast valve decreases
the solvent recovery rate.