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leaky return valve

mrblintmrblint Member Posts: 3
There is a leak on the main return shutoff valve on our hot-water heating system (1940s-era black iron). Is there a way to replace the valve washer which doesn't involve draining the water from the system? Is there some sort of air bladder that a plumber would have that gets put into the opening and inflated to stop the outflow temporarily, so that only some of the system's water drains out?


  • hot_rodhot_rod Member Posts: 13,314
    There are freeze cuffs for that are used for situations like that. It may be cheaper and just as easy to drink down, rebuild or replace and refill?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
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