Model 50 Valve Maintenance Procedure - Siemens Maxum II PD PA AP Service Manual

Valves
4.3 Model 50 Valve
Figure 4-11
4.3.4

Model 50 Valve Maintenance Procedure

If customer maintenance personnel are not technically trained to repair the Model 50 valve on
site, it is recommended that the valve be returned to Siemens for service, repair, or direct
replacement.
Valve Removal
1. Turn off the oven heater and allow time for the oven to cool to a safe temperature.
2. Turn off all gases going to the valve. Start by turning off the sample gas by blocking it in at
the sample system. Flush any hazardous gases in the sample loop with an inert gas. Block
the carrier gas by closing the block valve supplying carrier to the analyzer. Block in the
valve gas by closing block valve suppling valve gas to the analyzer.
3. Shut off the air to the oven heater.
4. Open door to the Maxum II oven using a 4mm (5/32'") Allen wrench.
5. Tag each tubing connection to the Model 50 valve with the valve port number or actuation
line position.
48
Model 50 Valve Exploded View
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001