1.0 Assembly Preparation:
1.1
Only valves designated for cleaning by assembly order are allowed in clean area.
1.2
Prior to assembly clean area must be cleaned and assembly bench area covered
with polyethylene sheeting.
1.3
Following degreasing, and through final bagging, personnel handling wetted areas
of components and assembled valves shall use latex gloves to prevent
contamination.
1.4
All tools necessary to perform assembly functions must be cleaned and degreased.
2.0 Component Cleaning Prior to Assembly:
2.1
In the process of preparation for cleaning, the assembler will watch for defects in
material and workmanship of the component parts, setting apparent defective
parts aside for disposition.
2.2
Components are thoroughly cleaned and degreased, using a variety of available
methods. When detergent and other water-based methods are used that require
rinsing, final rinsing shall be with demineralized water, to remove all surface
contaminants.
2.3
Once degreased all components are to be thoroughly dried. Forced air-drying, if
used, shall be with nitrogen or filtered non-lubricated air. Components are to be
then rinsed with isopropyl alcohol. Components may be aired dried, or oven dried
for expediency and/or to ensure all trapped moisture is removed.
2.4
Components shall be visually inspected under bright white light, and a wipe test
performed to reveal surface contaminants. Any residue evident on the wipe test
shall require complete re-cleaning
2.5
Components having passed 5.4 shall be subjected to a final inspection under black
light to ensure no hydrocarbon residue remain. Any phosphorescence seen shall
require re-cleaning of component until no phosphorescence can be seen. Black
light inspection shall be performed in an area where ambient light is sufficiently
dimmed to allow easy viewing of hydrocarbon phosphorescence.
2.6
Cleaned Components are then immediately moved to clean area.
3.0 Assembly:
3.1
Valves are assembled in clean area, using tools that have been degreased.
3.2
Standard assembly procedures related to specific product line shall be followed.
3.3
When needed oxygen compatible lubricants (e.g. Krytox ™) are to be used
sparingly applied to seat surfaces in rubbing contact, and on other sliding/rubbing
friction pairs.
4.0 Testing:
4.1
After assembly, all valves are shell and seat tested using clean, dry nitrogen
following standard test procedures.
4.2
Safety precautions must be followed at all times especially those that require full
(1.5X) shell test.
4.3
Test fittings shall be clean and degreased. PTFE tape may be used for thread
sealant if needed; all tape remnants shall be removed from valve(s) prior to
packaging.
5.0 Packaging:
5.1
All components after assembly and testing will be bagged and heat-sealed in 5
mil. Polyethylene bags with desiccant packs for entrapment of any stray moisture.
5.2
Each package includes a written statement on the cleaning, and suggestions for
handling for customer reference.
