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  1. valveguru

    HIP'ing of High Presssure Valve Bodies

    We regularly produce valve using the hipping process. It gives us very high quality parts, and forged equivalent materials properties. Often you will find that the mechanical strength of castings are are lower than that of forgings. We buy components from Sadvik and BodyCote. Lead time...
  2. valveguru

    Koso Hammel vs CCI vs Copes Vulcan

    Koso Japan was a licensed manufacture of CCI Drag trim. They were given drawings and produced hardware from 1" through 8" 600# valves. These valves were designed for intermediate service, not for severe service. This licensing agreement was terminated a number of years ago, and the technology...
  3. valveguru

    Koso Hammel vs CCI vs Copes Vulcan

    Flashing is easy to predict or control. The amount of volumetric expansion on saturted water from 600 psig down to 10 psig is about 250:1. If you have a 25 ft/sec line velocity coming into the valve, the velocity out would be 6000 ft/sec. This of course cannot occur, as downstream velocities...
  4. valveguru

    Koso Hammel vs CCI vs Copes Vulcan

    Normally I would not do a direct vendor to vendor comparison on an open formum like this, as I believe that this forum should be a purely technical basis. However, MattC1234 has stated some points regarding vendors and equipoment history that should be cleared up. 1) CCI was the first...
  5. valveguru

    Koso Hammel vs CCI vs Copes Vulcan

    Recognize that there are a number of different manufacturers that produce multiturn trim for both noise and cavitation control. The comparison of trim design has a number of different considerations: - Number of stages and expansion between stages - Flow passage design - Strucural ligaments in...
  6. valveguru

    Sealing material for Cryogenic test

    Sealing at cryogenic temperatures even with teflon or KellF presents issues. You are better off using thin sections instead of thick section. Old ANNIN split body valves used .032" thick sheet gasket compressed to .018/.020" thick and readily passed cryogenic testing at these temperatures...

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