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check valves

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STEAM DOCTOR
STEAM DOCTOR Member Posts: 2,391
in Strictly Steam
what is the purpose of check valves on hw zones on steam boilers

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  • Al Letellier_21
    Al Letellier_21 Member Posts: 400
    check valves

    They exist to keep the zone from gravity feeding and to help keep the water in the zone
  • STEAM DOCTOR
    STEAM DOCTOR Member Posts: 2,391
    thanks

    does it matter if the check valves are above or below the water line and if they are before or after the purge valves
  • STEAM DOCTOR
    STEAM DOCTOR Member Posts: 2,391
    check valves

    if the entire loop is below the water level are the check  valves necessary? also is it necessary to purge a loop that's below water level? if yes are two purge valves necessary or can the loop have a single purge valve and the boiler it self will function as the discharge valve? thanks
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