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WHAT IS THIS VALVE FOR

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john_181
john_181 Member Posts: 93
in THE MAIN WALL
Hello guys,  Can anyone tell me what this valve is for (or was for).  It is installed on an old 80+ year old hot water boiler system.  It is on the return side of the boiler. I believe the system use to be a gravity system but not sure.  This old valve says DELTA 125 on it.  It has a plunger that works up and down.  The plunger was activated by a unique device that was installed on top of the valve.  It had a tank or canister that when heated by an electric element attached to it - heated up a liquid in it and pressed the valve down.  I have no idea what it was for or anything.  I attached a picture to show it.  sorry for all the arrows - i used the pic for something else.  The valve is under the yellow arrow on the left side of the picture.



Thanks

Comments

  • don_9
    don_9 Member Posts: 395
    can we guess?

    Sounds like to me maybe it was the first go at a zone valve.What control the electric element?
  • john_181
    john_181 Member Posts: 93
    what controlled it

    it was controlled by the thermostat
This discussion has been closed.

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