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steam Zone valve part

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Hello, 
Looking for help identifying this part that attaches below the zone valve housing. Inside the part is a bar and a spring below the bar. The bottom is a solid plug. I have two of these zone valves and the unknown part on the other one has a bar inside and a loose ball below the bar( no spring) solid plug on the bottom.
 Thanks in advance, Jim

Comments

  • JUGHNE
    JUGHNE Member Posts: 11,061
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    Never saw one before in my life.

    Could it be a simple vacuum breaker that opens when valve is closed to allow the main to drain back unhindered by vacuum built up by the collapse of the steam as it cools off.
    It would let air into the pipe.
    Just a WAG.

    The U bend of copper? could it be an equalizer tube?
    (Thinking of refrigeration expansion valves...another WAG)
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,526
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    I have no idea. Always something new in what's old!
    Retired and loving it.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,529
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    All it is is a lever operated gate valve. Looks like an electric actuator behind it to open and close the valve.

    I am guessing the u shaped tubing bleeds a little steam across the valve to make opening and closing under pressure easier........equalizes the pressure on the gate. I have no clue what the other devise is.

    As for parts I am sure your out of luck. That has to be 1950s

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,529
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    Looks like it says" Mar Coil heater Company, New Jersey"
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,526
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    Ed, you the man!
    Retired and loving it.
  • CLamb
    CLamb Member Posts: 281
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    The Smithsonian has a collection of their catalogs--but not online. https://americanhistory.si.edu/collections/search/object/SILNMAHTL_29581
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,526
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    Nice find!
    Retired and loving it.
  • jktrammd
    jktrammd Member Posts: 2
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    Thanks for the comments, appreciate them.
    This steam system is part of a 100 year old church. Slowly rebuilding steam system and learning a lot from your books and this great website’s experts.
    Jim
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,526
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    Thanks, Jim! 
    Retired and loving it.