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50 percent Glycol valve rating

JoeC
JoeC Member Posts: 43
in THE MAIN WALL
I'm finding alot of control valves are '50 percent Glycol' rated. Am I correct in assuming that such valves should only be used in applications where a 50/50 glycol to water mix will be used? (I never had that explained to me by any rep)The extreme cold we routinely see here, demands that I provide freeze protection to -45F. So obviously I have to install some pretty strong glycol/water solutions to my systems. Will the stronger mixes account for all the leaking packings?

Comments

  • bigugh_4
    bigugh_4 Member Posts: 406
    Glycol

    Is a cousin to alcohol. and It is slicker and molecular thinner than water. as is alchol. It is harder to pump,(slips past the impeller), harder to keep from leaking,
    (smaller moluecules sneek past packings). I buy the best valves that also rate themselves as glycol handleing. Look over the specification sheets and the stocked items, up there, to obtain the best. JMHO
    bigugh
  • RB_2
    RB_2 Member Posts: 272
    Case of less is best.

    Some glycols actually loose their freeze protetction in higher concentrations (ie: Ethylene at 90% by mass provides protection down to -22 F compared to 50% for -30 F)

    Propylene at 55% provides protection to -43 F.

    Like BIGUGH said its a slippery stuff...
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