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  • Don’t specify NPT connections if you are worried about particulate.  Particulates can clog sterile filters, and, more importantly are a final product quality concern.  If you are testing Compressed gas for particulate, NPT connections increase the probability of failing the test.  The act of threading a Tube fitting into the inlet, outlet or gauge port of the valve during installation creates metal particulate, and places for particulate to accumulate!  And, if contractor uses Teflon tape, you will create Teflon particulate.  Sanitary clamp connections should only be used.
  • Specify certified Clean for Oil Free, or O2 Clean-Assemble dry. When selecting these valves.  The steps involved in certified cleaning remove lubricant and particulate from wetted parts. It’s important to remove lubricants because they will atomize in the presence of high velocity gas, and can add to particulate loads.
  • Make sure your valve is sized correctly. Oversized valves, which operate close to the seat, are more likely to operate in an unstable manner, with the trim components constantly adjusting in an attempt to regulate pressure. That increased frequency of movement increases wear over time, and component wear is another source of particulate.

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