Pressure Vessel Safety Valves
ASME Section VIII relief valves for unfired pressure vessels.
Air, steam, and liquid service. Configure online.
Instant pricing. Ships in 12-14 days.
Sound familiar?
"Our vessel needs a new relief valve and production is waiting on a quote."
"I need to verify the valve capacity meets our vessel requirements before ordering."
"The supplier keeps asking questions I don't have time to answer just to get a price."
We make it simple.
Instant Pricing
No RFQs. Configure your valve and see the price immediately.
Capacity Verification
Every configuration shows relieving capacity so you can match vessel requirements.
Multi-Service
Air, steam, and liquid service available. Select your media and see compatible options.
Recommended for Pressure Vessel Protection
Series 740
Versatile multi-service protection
- Pressure: 15-350 psig (250 steam)
- Inlet: 1/2" to 3" NPT
- Material: Bronze body, stainless trim
- Certification: ASME Section VIII, National Board
Best for: Pressure vessels, heat exchangers, reactors, and process equipment
Configure Series 740 →
Not sure which series? Use our Valve Finder →
How to Choose the Right Valve
Choose Series 740 if:
- Unfired pressure vessel (Section VIII)
- Set pressure up to 350 psig (250 for steam)
- Threaded NPT connections
- Standard capacity requirements
Choose Series 743 if:
- Corrosive media or environment
- Sanitary or pharmaceutical application
- All stainless construction required
- Higher temperature service (to 800°F)
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Engineering You Can Trust
Certifications
Every Series 740 valve is ASME Section VIII certified and National Board registered for unfired pressure vessel protection.
Why Trust Us
Capacity Data Included
Every configuration shows relieving capacity for your selected media at set pressure.
Multi-Media Options
Configure for air/gas, steam, or liquid service with appropriate certification.
Engineer-Reviewed
Our configurator logic is validated against ASME code requirements.
Frequently Asked Questions
Section I covers fired steam boilers (with burners). Section VIII covers unfired pressure vessels — equipment that receives steam, air, or other media from external sources. Most process equipment requires Section VIII.
Check your vessel data sheet or nameplate. Required capacity depends on your process conditions. Our configurator shows capacity for each valve size at your set pressure so you can verify it meets requirements.
The Series 740 is available for all three media types, but the valve must be ordered for specific service — internal trim and certification differ by media. Select your media in the configurator.
Standard 740 is bronze with stainless trim. For corrosive applications, Series 743 offers all-stainless construction. Contact us for specific material recommendations.
Yes. Every valve ships with certificate of compliance, test report, and capacity data. ASME Section VIII certification and National Board registration included.
ASME allows multiple valves to provide total required capacity. Each valve must be set at or below MAWP. Configure each separately and verify combined capacity.
Why Buy From SafetyControlValves.com
Factory-direct from an American manufacturing facility
We get it right the first time
Made-to-order, shipped direct
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Instant pricing on ASME Section VIII valves.
No quote requests. Ships in 12-14 days.
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