Xylem 51-1 Mechanical Water Feeder for Steam Boilers

The Xylem McDonnell & Miller 51-1 is a mechanical water feeder designed for low-pressure steam and hot water boilers with capacities larger than 5,000 square feet. This float-operated unit automatically maintains proper boiler water levels through proportional feed action, ensuring continuous protection against low water conditions.

Key Features:

• Float-operated mechanical design for reliable automatic water feeding
• Quick-change replaceable cartridge valve and strainer for easy maintenance
• Proportional feed action responds to water level changes
• 1-inch NPT female-threaded inlet and outlet connections
• Can be field upgraded with a No. 2 switch to add low water cut-off function
• Continuous water level maintenance independent of electrical service

Specifications:

• Maximum water supply pressure: 150 PSI
• Maximum inlet water temperature: 120°F
• Maximum vessel pressure: 35 PSI
• Connection size: 1-inch NPT female

Ideal for commercial and industrial steam boiler applications requiring reliable, continuous water level control with cold water feed systems.