M11 Procedure - Valve Body Cleaning; M11 Procedure - Valve Body Re-Assembly - Siemens Maxum II PD PA AP Service Manual

4.6.9.2

M11 Procedure - Valve Body Cleaning

1. To clean the valve body, the following components are recommended:
- Ultrasonic cleaner
- Cleaning solution as described in the section of this chapter titled, Cleaning of Parts.
Where indicated, use only Krytox 240AC grease (Siemens part # G87004)
If a strong detergent solution is used, all cleaned parts must be thoroughly rinsed with
deionized water or distilled water to remove detergent residue before reassembly of valve
body. All parts must be thoroughly dried by shaking, allowing to air dry, or blowing with
clean air.
Note
If cleaning solution becomes contaminated during performance of the following steps,
replace it with an uncontaminated supply.
2. Fill Ultrasonic cleaner with cleaning solution.
3. Before placing valve body parts in Ultrasonic cleaner, wipe off all grease and foreign
contaminants from valve parts.
4. Place valve body parts on a lint free cloth in ultrasonic cleaner.
5. Turn Ultrasonic cleaner ON and allow to run for 10 minutes.
6. Remove parts and shake cleaning solution from tubes. If detergent is used make sure that
no residue remains by rinsing thoroughly with deionized water or distilled water. Let parts
air dry before reassembling.
4.6.9.3

M11 Procedure - Valve Body Re-assembly

1. Before reassembling valve body parts, clean hands, tools and perform reassembly
procedures in a clean dust free area.
2. Apply KRYTOX 240 AC in both "O" ring grooves of spring-loaded piston (14)
3. Install silicon rubber O-rings (12 and 13) and apply KRYTOX 240 AC grease to their outer
surfaces.
4. Apply KRYTOX 240 AC grease to each of the fingers of the finger spring (10) of air-loaded
piston (11).
5. Place air loaded piston (11) over the small diameter of spring-loaded piston (14) with finger
springs (10) outside. Align piston with guide pin. Refer to Figure 7-5.
6. Apply a bead of KRYTOX 240 AC grease to the "O" ring air-loaded piston (11) groove.
Refer to Figure 7-7.
7. Install silicone "O" ring (9) and apply KRYTOX 240 AC grease to the "O" ring outer surface.
8. Apply a thin film of KRYTOX 240 AC grease to inside of valve body (8) where the pistons
(14 and 11) will be sliding.
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
NOTICE
Do not place polished valve body (8), or associated parts, against any surface in ultrasonic
cleaner or against any abrasive surface. Place parts on a lint free cloth, free of foreign
contaminants.
Do not wash O-rings in any type of cleaning solvent.
Valves
4.6 Model 11 Valve
97