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Steam valve replacement washer profile

CaptSkinnyCaptSkinny Member Posts: 4
edited January 13 in Strictly Steam
I have to replace the main washer in several old steam valves, but I'm not sure the replacement should look like. The surface at the end of the valve stem where the washer sits is rounded (concave) rather than flat. Do I need to match this profile, or will a flat rubber washer do?


  • Larry WeingartenLarry Weingarten Member Posts: 2,040
    Hello, I'm just a plumber... so is it possible to get a photo of the seat that this washer mates with? That would help me anyway to be better able to answer your question.

    Yours, Larry
  • acwagneracwagner Member Posts: 507
    I had the same problem. I ended up just making my own by getting a sheet of silicone and cutting out a circle sized to fit.
    Burnham IN5PVNI Boiler, Single Pipe with 290 EDR
    18 Ounce per Square Inch Gauge
    Time Delay Relay in Series with Thermostat
    Operating Pressure 0.3-0.5 Ounce per Square Inch

  • CaptSkinnyCaptSkinny Member Posts: 4
    @Larry Weingarten - I've added photo of the valve seat. I didn't look at it close enough to notice the groove before.
  • Larry WeingartenLarry Weingarten Member Posts: 2,040
    Hi @CaptSkinny , It looks to me like a flat washer will work fine, though it needs to be able to take the heat. Silicon rubber, if it's not too soft seems a good fit. @acwagner nailed it! The seat itself looks to be in good shape. :)

    Yours, Larry
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