4.6.2
Model 11 Maintenance Overview
Maintenance procedures for the Model 11 Valves are grouped into two types, Mini-
Maintenance procedures and Maxi-Maintenance procedures. Mini-Maintenance procedures
involve working on the valve while it is still installed in the analyzer. Maxi-Maintenance
procedures may be used when Mini-Maintenance does not correct a valve fault. This manual
covers the Maxi-Maintenance procedures in the following order.
● Mini-Maintenance procedures:
– Valve Cap Disassembly
– Cleaning Fittings and Tubing
– Valve Cap Assembly
● Maxi-Maintenance procedures
– Valve Body Disassembly
– Valve Body Cleaning
– Valve Body Assembly
To assure optimum valve operation, a clean contaminant free work environment is required
for this procedure. To repair the valve on site, the customer must have the necessary
maintenance tools and replacement parts. Recommended valve spare parts, including the
Model 11 Valve repair kit (PN K21040) and Model 11 LDV repair kit (PN 2015581-001), can
be obtained from Siemens. Recommended tools include an ultrasonic cleaner and a clean
workstation with lint-free cloth. In addition, special pliers that are available from Siemens (PN
V16031) are required to completely disassemble the valve. These pliers are part of the tool
kits mentioned above.
Additional procedures related to the Model 11 Valve can be found in the Model 11 Valve Repair
Manuals, which can also be found on the Maxum II Documentation CD.
It may be easier and less expensive to replace a valve or return it to Siemens for service rather
than perform Maxi-Maintenance.
4.6.3
M11 Intended Users
This procedure is intended for qualified users with sufficient training to safely repair a valve in
the field. If customer maintenance personnel are not technically trained to repair the valve on
site, it is recommended that the valve be returned to Siemens for repair or direct replacement.
In addition to training, the customer must have a clean work environment and the proper tools
available for rebuilding and cleaning the valve. Performing the work in a contaminated
environment, performing the work incorrectly, or using incorrect tools may damage the valve.
4.6.4
M11 Safety and Certification Information
This procedure is not likely to directly impact the safety systems of the analyzer. However,
care must be exercised at all times when working with the analyzer. Since the valve is located
in the oven of the Maxum II, appropriate care must be taken to ensure that the environment is
safe to perform the work.
Valves
4.6 Model 11 Valve
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
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