For information about replacing the backing pump’s demister element, see “Troubleshooting” in
the VACUUBRAND Technology for Vacuum Systems Instructions for use (VACUUBRAND part
number 99139 / 11/20/2013).
Contact Waters to order parts (see Contacting Waters).
3.16
Replacing the internal source exhaust valve (KAD)
Replace the source exhaust valve annually, or when a source-pressure test fails and all other
causes of failure have been investigated.
Note: The following procedures apply only to instruments fitted with the internal source exhaust
valve (serial number suffix "KAD"), shown in the figure below.
See Identifying your instrument version for guidance on identifying your QDa version and
Connecting the external source exhaust valve assembly (KAB) for details about replacing the
external source exhaust valve assembly (serial number suffix “KAB”).
Figure 3–17: Internal source exhaust valve—rear configuration
Valve grip panel
Exhaust hose bracket
PTFE exhaust tubing
June 15, 2017, 715003956 Rev. F
Page 54
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