What Do Safety Valve Tags Mean? HV vs V vs UV Explained - Weekly Boiler Tip
Not all safety valves are approved for the same job.
In this Weekly Boiler Tip, we break down the markings found on a boiler safety valve and explain what they actually mean. While set pressure and capacity are easy to spot, the stamped labels on the valve are just as important because they tell you what application the valve is approved for.
We cover the meaning behind NB, HV, V, and UV safety valve markings, plus the key exception that trips people up in the field.
If you work on steam boilers, hot water boilers, or pressure vessels, knowing these markings matters.
WARE is the nation’s leading boiler rental, sales, service, and training provider helping industries stay safe and operational. Visit http://www.WAREinc.com
Need replacement parts? Visit http://www.BoilerWAREhouse.com for same-day shipping on thousands of boiler parts and controls.
Looking for operator training? Check out Boiler University at http://www.wareinc.com/boiler-university
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👍 Like & share to help us elevate the steam industry.
👍 If this helped you, like, subscribe, and drop your boiler questions in the comments.
© 2026 @wareboilers. All rights reserved. Unauthorized reproduction or distribution of this content is prohibited. Ware Boilers’ videos are intended for promotional purposes only and does not constitute professional advice. Please contact our boiler professionals via https://www.wareinc.com/ with specific questions or repair needs. You should not attempt any boiler repair or modification without first consulting with a licensed contractor and the manufacturer. Ware Boilers does not warrant the accuracy, completeness, or usefulness of information available on this YouTube page. Nothing contained in or provided in any of Ware Boilers’ videos is intended to constitute advice or to serve as a substitute for a licensed contractor’s inspection or manufacturer specifications. Any reliance you place on such information is strictly at your own risk.
In this Weekly Boiler Tip, we break down the markings found on a boiler safety valve and explain what they actually mean. While set pressure and capacity are easy to spot, the stamped labels on the valve are just as important because they tell you what application the valve is approved for.
We cover the meaning behind NB, HV, V, and UV safety valve markings, plus the key exception that trips people up in the field.
If you work on steam boilers, hot water boilers, or pressure vessels, knowing these markings matters.
WARE is the nation’s leading boiler rental, sales, service, and training provider helping industries stay safe and operational. Visit http://www.WAREinc.com
Need replacement parts? Visit http://www.BoilerWAREhouse.com for same-day shipping on thousands of boiler parts and controls.
Looking for operator training? Check out Boiler University at http://www.wareinc.com/boiler-university
🔔 Subscribe for weekly boiler tips and deep dive technical content.
👍 Like & share to help us elevate the steam industry.
👍 If this helped you, like, subscribe, and drop your boiler questions in the comments.
© 2026 @wareboilers. All rights reserved. Unauthorized reproduction or distribution of this content is prohibited. Ware Boilers’ videos are intended for promotional purposes only and does not constitute professional advice. Please contact our boiler professionals via https://www.wareinc.com/ with specific questions or repair needs. You should not attempt any boiler repair or modification without first consulting with a licensed contractor and the manufacturer. Ware Boilers does not warrant the accuracy, completeness, or usefulness of information available on this YouTube page. Nothing contained in or provided in any of Ware Boilers’ videos is intended to constitute advice or to serve as a substitute for a licensed contractor’s inspection or manufacturer specifications. Any reliance you place on such information is strictly at your own risk.
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