Valves prepared for ultrapure process, such as chem, semicon, etc. in Class 100 cleanroom

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CDB Procedure

Optional High Purity Quality Assurance Procedure
Class 100 Cleanroom

SCOPE:
  1. This specification describes the cleaning procedure used for the cleaning of components and valves for DI Service.
  2. Cleaning and packing procedures are carried out in class 100 cleanroom with class 100 hoods.
PROCEDURE:
  1. Wipe external surfaces with acetone to remove ink markings and surface smudges which might add to interior contamination in subsequent cleaning steps.
  2. Rinse components with water to remove particles, soil, dirt and grime.
  3. Soak or flush component with a detergent/deionized water solution for a minimum of five minutes. Scrub and clean component interior with a soft nylon brush, use nitrogen to blow brushes through component. The standard detergent solution is "Triton x 100" at 1 percent.
  4. Inspect component for smooth clean interior.
  5. Rinse component in a clean recirculating deionized 18 megohm water bath while rotating or otherwise agitating component. Rinse through a minimum of two stages, monitoring DI sensitivity for a minimum of 10 megohms, at final rinse.
  6. Nitrogen wad or wipe with lint-free kleenwipe to remove excess water. Inspect kleenwipe for cleanliness.
  7. Purge/dry component using filtered nitrogen from a cryogenic source.
  8. Final inspect component. Use a 3200-3800A wavelength black light in a non-lit area to inspect component and dried kleenwipes for any smudges/traces of fluorescent smears. Reclean if flouresing appears.
  9. While under purge, apply protective caps to pipe ends or otherwise place component in a clean 6 Mil polyethylene sleeve and heat seal.
Easy-to-use calculator finds pressure drop across specific Plast-O-Matic Valves...page includes a Cv chart for all applicable valves. Enter the Cv, your flow rate, and you'll instantly know the approximate pressure drop. For comparison purposes only.

HELPFUL LINKS:

What, How, Where & Why of Relief Valves
Explains the application of relief valves as backpressure valves, regular relief, anti-siphon, and how to select a relief valve.

General Relief Valve Page
Provides an overview of the entire line of Plast-O-Matic relief/bypass/backpressure/anti-siphon valves; may be the page you were on prior to this one.

Pressure Regulators
Keep in mind that the RV series is used to control backpressure or "upstream" pressure. If you are looking to control pressure "downstream", aka "outlet" pressure, then please use this link to our Pressure Regulator line. Remember, Relief and Backpressure valves are normally-closed valves for upstream control; Pressure Regulators are normally-open valves for downstream control.

Explanation and diagram of the patented Fail Dry safety vent.

5 Most Common Mistakes When Specifying Valves
This is a very helpful, brief tutorial written by Andy Ryan, Manager of Plast-O-Matic's Technical Group.

Valve Pressure Loss & Flow - Q&A and Equations
(Explains Cv and Delta P, how to better specify valves, etc.)

Please click here for an automatic, easy to use catalog request form


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