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How does this flow control valve work in my monoflo system?

sixplex
sixplex Member Posts: 90
in THE MAIN WALL

Hey guys, my 70 y/o monoflo system has what looks like a flow control device made by Armstrong.

Does anyone have a diagram of how this specific flow control device works?

IMG_20180724_161337.jpg

Comments

  • leonz
    leonz Member Posts: 1,354
    edited December 2024

    Is this valve in an attic or crawl space?

    It is a spring tensioned straight flow check valve.

    Find the arrow in the casting and you will find the heated water flow direction.

    The valves design allows the cartridge and valve seat to be removed in one piece and cleaned if needed. 😀

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,658

    A flow check is used if you have multiple zones, and each zone has a circulator. Or if you get domestic hot water with a tankless heater off the boiler.

    If you have a zone valve system it is not required..

    The screw on top should be turned clockwise in normal operation and turned counter clockwise for the open position

    It is basically a weighted check valve. With no flow the weight closes the valve. When the pump starts the circulator opens the valve and moves water through the zone.

    With multiple zones each zone has a flow check. The flow checks do not allow gravity flow when the circ is off (which is good).

    And they allow flow only in the zone where the circ is running.

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