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  • Gas valve question

    Got a question regarding a gas valve. I found this question on a gas heating certification exam that i have been reviewing from a national certification council. Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds?
    A. 30.5" wc
    b. 60.5" wc
    c. 10.5" wc
    d. 13.5" wc
    any info would be appreciated.
    Later, jonesy

  • #2
    Re: Gas valve question

    I'm gonna say the answer is D 13.5" WC

    Since 11" WC ( 6 oz) is approaching the normal limit of a gas valve (1/2 PSI) If you Hit 13.5" WC I would say you are over 1/2 PSI and the safety should kick in to protect the valve.

    Okie

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    • #3
      Re: Gas valve question

      Im gonna agree with Bill. Most gas valves have "1/2 psi Max" cast into the body. I saw a valve one time that had 60 pounds of air put to it. It let gas through without power being applied, but surprisingly it still regulated.

      Andy

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