Conbraco Industries 18C-542-4-150 Valve

The Apollo 18C-542-4-150 is a high-capacity bronze automatic temperature and pressure relief valve engineered for the protection of large-scale commercial hot water heaters and storage tanks. This ASME Section IV certified valve features a substantial 6,050,000 BTU capacity, making it a critical safety component for high-output hydronic systems. The unit is factory set at a 150 PSI relief pressure and a maximum temperature threshold of 210°F. Built with a rugged ASTM B584 bronze body and a 4-inch stainless steel probe, the assembly ensures long-term durability in demanding environments. The 1 1/2" Male NPT inlet and 1 1/2" Female NPT outlet allow for straightforward integration into standard commercial piping. Professional contractors rely on this T&P relief valve for its CSA listed performance and its ability to prevent catastrophic tank failure through precise thermal expansion and over-pressure management.

• High BTU Rating: Offers a 6,050,000 BTU/HR steam relief capacity to support the safety requirements of industrial-sized storage tanks.
• Corrosion Resistance: Features a nylon-coated element and 300-series stainless steel internal components to prevent mineral buildup and pitting.
• Superior Sealing: Equipped with a silicone seat disc that ensures positive shut-off and prevents simmering under high-temperature service conditions.
• Code Compliance: Fully compliant with ANSI Z21.22 and CSA 4.4 standards for reliable commercial hot water system protection.

What is the proper installation orientation for this valve?
To maintain functional integrity, this Apollo Valves 18C-500 series unit should be installed with the 4" probe fully immersed in the hot water within the top 6 inches of the tank. The discharge line must be piped at full size to a safe point of disposal.

Can the pressure setting be adjusted in the field?
No, this 150 PSI relief valve is factory-set and sealed. Tampering with the spring tension or pressure setting voids the ASME certification and creates a significant safety hazard for the facility.

Why is a stainless steel probe used on this model?
The 1-1/2" and 2" models in the 18C series utilize stainless steel elements specifically to handle the increased mechanical stresses and flow velocities found in high-capacity commercial water heating applications.

This item is not eligible for free shipping.

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.