Siemens Maxum II PD PA AP Service Manual page 47

All foreign contamination adhering to valve must be removed using cleaning solvent, such as
hexane, acetone, or methanol and a dust/lint free cloth. After cleaning Model 50 valve
components, shake or blow with clean air the excess cleaning fluid from the individual
components. Ensure that the components are air dry before reassembling.
Note
Do not allow Model 50 valve polished surfaces to rest on any surface other than a lint free
cloth. Clean sample flow openings in top plate, center plate, bottom plate and Valco fitting nuts
using a syringe filled with cleaning solvent such as hexane, acetone, or methanol.
Potential burn hazard. Handling hot components may result in personal injury.
Before servicing the Model 50 valve, it is important that primary AC power to the Maxum II
be turned off from the main circuit breaker, and the oven be allowed to cool. Only maintenance
personnel with proper authorization should open the electronic enclosure. Failure to observe
safety precautions can result in personal injury.
Figure 4-10
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
CAUTION
Dimensions and Flow Paths of Model 50 Valve
Valves
4.3 Model 50 Valve
47