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  1. vahid.z

    Test method for hard chrome electroplating on the engine cylinder bore

    Dears, I have to electroplate hard chrome on the bore of an engine cylinder and I need to evaluate the adhesion of the coating. I want to know which kind of coating adhesion test methods are suitable for cylinder bore? I found the bending method in the Internet search but I am not sure about...
  2. vahid.z

    Crankshaft Grinding and Nitriding

    Hi, I have ground the crankshaft (material: VCN 150 with nitrided surface) of a linear reciprocating engine to remove its ovality. the minimum grinding depth was 0.01 mm and the maximum was 0.06 mm (0.05 mm ovality). The engine documents claims that the non-uniformity of grinding depth results...
  3. vahid.z

    Crankshaft grinding and Nitriding

    Hi, I have ground the crankshaft (material: VCN 150 with nitrided surface) of a linear reciprocating engine to remove its ovality. the minimum grinding depth was 0.01 mm and the maximum was 0.06 mm (0.05 mm ovality). The engine documents claims that the non-uniformity of grinding depth results...
  4. vahid.z

    high power tubular heating elements

    Dear LittleInch Thank you for your hint for the surface temperature. it was a mistake. The medium temperature will be 600 C and the surface temperature is not controlled.
  5. vahid.z

    high power tubular heating elements

    Thank you for your very beneficial answers, The customer asks me to use high temperature materials such as Sic for the heating filament and inconel for the shealth (instead of stainless steel) and BN for the insulation. But I found from your answers that this can result in a very high film...
  6. vahid.z

    high power tubular heating elements

    Hi, I am asked to manufacture a tubular heating element with very special features, while I don't have experience enough in the heating elements field. The requirement for the element is as below: 1- Type: tubular heating element with a coiled heating filament (buried inside insulation). 2-...
  7. vahid.z

    correlation between gases and liquids Cv

    fwcatr thank you for your helps, Why should I do sizing? taskmaster asks me only Cv value and measuring procedure. sizing means determination of the flow rate in a valve (with known Cv) for a specific fluid under a given condition (pressure, temperature and so on). best regards
  8. vahid.z

    correlation between gases and liquids Cv

    fwcatr No I have not done any sizing. I will only report the Cv. The procedure and formula to do Cv measurement using water is so easy. which kind of sizing I should do?
  9. vahid.z

    correlation between gases and liquids Cv

    Dear Morten I have read the handbook, like ANSI/ISA-75.02.01 standard, the handbook presents different formulations for compressible and in compressible fluids. however, all the valve manufacturers give a unique Cv (at 100% travel) for a valve, regardless of the fluid type. It means Cv of a...
  10. vahid.z

    correlation between gases and liquids Cv

    Thank you for the answers, I have read ANSI/ISA-75.02.01 standard, but I didn't find a clear answer. In fact, I am manufacturing valves (I am new at this) and I must report the Cv of the valves. the valves are for air flow. it is very difficult for me to do the Cv test with air so, I decided to...
  11. vahid.z

    correlation between gases and liquids Cv

    As I know, Cv is the capacity of a valve to pass water in GPM with 1psi pressure drop. so the Cv of a valve doesn't depend on the medium and fluid type (gas or liquid). regarding this, can I use water to measure Cv of a Valve that will work to pass Air? In other word, if I measure Cv of a valve...

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