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  1. abrieden

    Looking for Shell Approved Valve Manufacturer for Ball, Gate, Globe, Check & DBB ?

    Shell like other refineries have an AML (Approved Manufactures List). Certain valve manufactures that have been tested & approved will be on this list. Could take up to a year for approval. Not sure of the ball valves or globe valves, But Zwick is one of the triple offset valves on the Shell AML.
  2. abrieden

    Pressure / Temperature Ratings

    Per ASME / ANSI B16.34: The rated pressure (psig) and temperature chart shows 20 F to 100 F (-29 C to 38 C) in the first line. My question is if -29 C is equal to -20 F than why does it show 20 F instead of -20 F. I am guessing this is a typo. Does anyone have any further documentation to prove...
  3. abrieden

    Zwick Valves

    Instead of looking for the definition of "Best" on the market, I should have been more complacent in my question. Zwick has been around for over 30 years and has gone into many extreme conditions for several applications. Steam, Petrochemical, Oil Refinery and so on. So when compared to Vanessa...
  4. abrieden

    Zwick Valves

    Is Zwick Tri-Con valves the best on the Market. I have read that this triple offset buterfly valve has zero leakage.
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