Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Thrush valve

After tolerating my fairly new regulator that's on the input line of my boiler system I looked for a regulater made by thrush, since I read that they were very reliable they're also hard to find, but I found one that's adjustable

from 2 lb to 40 lb it's preset at 28, I paid $50 for it on eBay it's brand new it's certainly looks brand new but hopefully it will function better and more reliably. Since it's probably fairly old I'm tempted to tear it apart and make sure all the rubber is in good condition but perhaps I should just leave it alone for now and give it a try?

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 24,138

    What was the matter with what you have? Watts would be my go to…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • photokynetics
    photokynetics Member Posts: 51

    The Watts regulator I have keeps falling up, it will not keep the pressure up. I thought about taking it apart from cleaning it up but I've read in other places that this thrush regulator is better

  • hot_rod
    hot_rod Member Posts: 22,826

    They all pretty much a spring and diaphragm inside, fairly low tech😉

    The brass versions tend to scale and fail less often

    Typically they work for a few hours or days and never again until you drain off pressure

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • The problem is that's not a pressure reducing valve. According to the paperwork on your bench , it is a pressure relief valve, If you turn it over there should be a tapping on the bottom.

    This does contain a diaphragm and sort of looks like a pressure reducing valve. But on this valve when the diaphragm flexes upwards it opens the drain at the bottom and allows water to drain out until the preset pressure is reached.