Conbraco 20-351-03 Gauge Valves

The Conbraco 20-351-03 Gauge Valves are engineered for reliable service in boiler water level monitoring and pressure vessel applications. These 1/2" NPT male rough bronze water gauge valves feature automatic ball checks as a critical safety mechanism, designed to shut off flow instantly in the event of glass breakage. This set is built to handle specific thermal demands, rated for 200 PSI @ 400F and 400 PSI @ 100F, making them suitable for mid-pressure steam systems. The integration of an EPDM glass seal and Teflon stem packing ensures leak-free performance and high chemical resistance, while the composite plastic type wheel provides heat-resistant manual operation. For contractors performing boiler sight glass replacement or system maintenance, the Apollo 20-350 series remains the industry standard for durability and ease of installation in commercial HVACR environments.

• Enhanced Safety: Integrated automatic ball checks prevent fluid loss and scalding if the gauge glass fails.
• Durable Construction: Heavy-duty rough bronze body provides superior corrosion resistance compared to lighter alloys.
• Leak Prevention: High-grade Teflon stem packing minimizes maintenance requirements and prevents stem leaks under high thermal cycling.
• Industry Compliance: Reliable performance for water gauge valve assemblies requiring precise pressure and temperature ratings.

What is the purpose of the automatic ball checks in this valve set?
The ball checks act as a safety shut-off; if the sight glass breaks, the internal pressure pushes the balls against the seat to stop the discharge of steam or hot water.

Can these valves be used with high-pressure steam applications?
These valves are rated for 200 PSI at 400°F. Always verify your system's maximum operating pressure to ensure it falls within the 400 PSI @ 100F or 200 PSI saturated steam limit.

What type of glass is compatible with the Conbraco 20-351-03?
Standard 5/8" OD gauge glass is typically used with these 1/2" NPT valves, secured by the EPDM seals included in the assembly.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.