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.
Pop off valve
What might cause my pressure relief valve to vent. I just started the boiler up for the season and I heard the valve blow off after about 20 minutes
Shut that boiler off!
That valve is set to pop at 15PSI or more, if it went off you have a serious safety issue. The normal operating pressure of a steam boiler is less than 2PSI.
The most probable cause is a plug in the pigtail between the boiler and the pressuretrol or vaporstat; it's the curly pipe below the gauge and vaporstat in the picture. If you are handy you can clean or replace that pigtail yourself BUT DON"T OPERATE THE BOILER TILL IT'S FIXED. The pressure relief valve will have to be replaced also, they become unreliable once they pop off.
BobSmith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
Vaporstat with a 12oz cut-out and 4oz cut-in
Pop off valve
I will follow your advice thanks !0
This discussion has been closed.
- 121.3K All Categories
- 84K THE MAIN WALL
- 2.9K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 417 Carbon Monoxide Awareness
- 40 Chimneys & Flues
- 1.7K Domestic Hot Water
- 4.7K Gas Heating
- 119 Geothermal
- 155 Indoor-Air Quality
- 3K Oil Heating
- 56 Pipe Deterioration
- 772 Plumbing
- 5.4K Radiant Heating
- 362 Solar
- 14K Strictly Steam
- 3K Thermostats and Controls
- 51 Water Quality
- 626 Buy, Sell, Barter
- 38 Industry Classes
- 73 Job Opportunities
- 19 Recall Announcements