Bell & Gossett model 3301-50 cast iron hot water relief valve in an angle pattern with a 1-1/2" inlet and a 2" outlet. This valve can be set at 50 psi and has a 4,900,000 BTU capacity. Cast iron or bronze safety relief valves are designed for fired and unfired hot water pressure vessels to protect against overpressure conditions. Cast iron models are used for hot water heating boilers and bronze models can be used on direct fired water heaters, or storage tanks with indirect heaters to match the BTU loads of the heat exchangers. Their maximum pressure is 125 psi and their maximum temperature is 250°F.
Bell & Gossett is a division of Xylem, a spin off of ITT Industries, and is a leading manufacturer of energy efficient pumps, valves, heat exchangers, and accessories for plumbing, wastewater, and HVAC — including steam and heat transfer — applications. The company sells a variety of products, including centrifugal pumps, hydronic specialties, heat exchangers, condensate handling equipment, valves, rotors and controllers, for use in residential, commercial and institutional buildings. Bell & Gossett is known throughout the HVAC business as the industry’s educator. Their Little Red Schoolhouse, a completely equipped learning center, has trained more than 60,000 engineers, contractors and installers in the proper design, installation, and maintenance of HVAC systems.