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  • The Myth of Pressure Independent VAV Terminals
    and complaints stem from improperly sized VAV terminals furnished with pressure independent (P.I.) controls. This practice is a " black eye" on our industry, an industry that almost universally assumes that the pressure independent feature will atone for oversized terminals, poor duct design, and sloppy
  • Take Out The Shake
    of load pressure -- then the coefficient of s2 disappears, leading to severe instability. The most critical point of operation is around the valve's null position. For a closed-center valve, Kp is very low. This leads to extremely low damping and is a major source of instability and oscillations
  • U.S. Battery and Fuel Cell Patents | January 2008 | A B T | 7MS.com
    Compiled by Eddie T. Seo, Official Gazette, Volume 1324 (November 2007) U.S. 7,290,554 (20071106), Embedded microfluidic check-valve, Paul B. Koeneman and Terry M. Provo, Harris Corp. U.S. 7,290,555 (20071106), Embedded microfluidic check-valve, Paul B. Koeneman and Terry M. Provo, Harris Corp

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