Disassembling the Valve Cap
1. Relieve the pressure on the base Allen Set Screw (21) by turning it counterclockwise until
it turns easily.
2. Remove the three Allen head cap socket screws (1) and separate the cap (3) from the valve
body (8). When the valve cap is removed, the following components are exposed. Refer to
Figures 7-2 and 7-4.
- Teflon Sealing disc (4) [clear]
- Dacron Cushion disc (5) [white] and
- "O" ring (6)
3. Inspect the Teflon sealing disc (4), Dacron cushion disc (5) and silicon rubber "O" ring (6)
for dirt or breaks.
If damage is evident on the O-ring, discard damaged part and replace with new
component(s). Regardless of whether damage or contamination is evident on the old seal
and cushion, replace them with new components.
4. Visually inspect the rest of valve. If it is clean and in good condition, it may be possible to
install a new disc seal diaphragm (4) and cushion diaphragm (5) and re-assemble the valve.
5. Examine each of the six plungers (7) for evidence of damage or contamination. If damage
is evident, discard defective plunger(s) and replace with new ones. Refer to Figure 7-3.
Note
The valve cap and fittings must be cleaned before reassembly. This step will be executed
later in this chapter.
To reassemble the valve cap (3), See the Valve Cap Assembly (Page 94) section later in this
chapter. If the valve actuating piston assembly is contaminated or malfunctioning, refer to Valve
Body disassembly.
4.6.8.2
M11 Procedure - Cleaning of Parts
All valve fittings and tubing must be clean and valve diaphragms inspected for cleanliness,
catalyst or polymer buildup. Before re-assembly, valve cap and plunger valve body faces
should be wiped clean using hexane, acetone or methanol and a lint free cloth.
An ultrasonic cleaner filled with a recommended cleaning solvent or detergent is recommended
for cleaning all components. However, after cleaning, there must not be any remaining residue.
If cleaning solution becomes contaminated during cleaning, it must be replaced with an
uncontaminated supply.
A syringe and appropriate solvent can be used to flush the ports of the valve cap. This is
described in the procedure.
It is important for proper procedures to be used when cleaning valve and detector parts. All
foreign contamination adhering to the part should be removed using an appropriate cleaning
solvent, such as hexane, acetone, or methanol and a dust/lint free cloth. Use of an ultrasonic
cleaner is often helpful. After cleaning, it is necessary remove excess cleaning fluid from the
components by blowing with clean air or shaking. Components must be air dry before
reassembling.
Valves
4.6 Model 11 Valve
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
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