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  1. #1
    Join Date
    Apr 2005
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    Dude here...

    What are the perils to oversizing steam valves?

    Dude out.

  2. #2
    Join Date
    Oct 2005
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    Control at lower demand, is the bigest. Thats why you will often see a 1\3 2\3 setup on steam valves.

  3. #3
    Join Date
    Apr 2005
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    Thread Starter
    By 1/3, 2/3 you mean "1/3 demand/load" and "2/3 demand/load" right?


  4. #4
    Join Date
    Oct 2005
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    No, its a two valve setup, one valve ( smaller) handles 1\3 of the capacity, and the other ( larger) handles 2\3 of the capacity,

    Say you're feeding a converter and you need a lot of modulation, at low demands you modulate a smaller valve which has tighter control, at mid demand you operate a larger valve without the smaller one, at high demand you operate both, it's a common setup for steam apps, that need a lot of modulation, the point is that an oversized steam valve will not control very well over the range of modulation,steam is harder to control than water,If you have an oversized valve it is likely that it will hunt at low to mid range.

  5. #5
    Join Date
    Apr 2005
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    Thread Starter
    Thanks dude.
    Much obliged.

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