Bell & Gossett 110033 – 3301-30 ASME Safety Relief Valve, 1-1/2" NPT, 30 PSI Set, 3,300,000 BTU/hr

Bell & Gossett 110033 – 3301-30 ASME Safety Relief Valve, 1-1/2" NPT, 30 PSI Set, 3,300,000 BTU/hr

Product Highlights

• Valve Size: 1-1/2" NPT (Inlet & Outlet)

• Set Pressure: 30 PSI

• Capacity: 3,300,000 BTU/hr

• Material: Cast Iron Body with Brass Internals

• Connection Type: Threaded NPT

• Application: Heating Systems

• Certification: ASME Section IV, National Board Certified

Product Description

The Bell & Gossett 110033 (Model 3301-30) is a heavy-duty ASME safety relief valve designed to protect hot water heating systems from excessive pressure. Constructed with a cast iron body and brass wetted internal components, this valve is a reliable solution for both fired and unfired hot water vessels.

Designed in compliance with ASME Section IV and certified by the National Board of Boiler and Pressure Vessel Inspectors, this valve offers a high BTU discharge rating while maintaining system integrity and performance.

The EPDM diaphragm provides a large effective area—approximately five times larger than traditional pop-type valves—helping overcome fouling and ensuring responsive pressure relief. A low differential between opening and closing pressures also reduces the risk of water flashing into steam, preventing system hammering.

Key Features

• High-capacity output: 3,300,000 BTU/hr

• Factory-set relief pressure: 30 PSI

• 1-1/2" threaded connections for quick and secure installation

• Engineered for long-term use in hot water heating systems

• Designed to meet ASME Section IV requirements

• Durable cast iron construction with corrosion-resistant internals

• Certified by the National Board

Technical Specifications