McDonnell & Miller Series 51/51-2 Mechanical Water Feeder

• For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed
• Quick-change replaceable cartridge valve and strainer
• Optional features
– No. 2 switch
– Manual reset
– Float block
• Proportional feed action
• Model 51 can be field upgraded with a No. 2 switch to
add low water cut-off function
• Maximum water supply pressure 150 psi (10.5 kg/cm2)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum vessel pressure 35 psi (2.5 kg/cm2

McDonnell & Miller Series 51-s/51-s-2 Mechanical Water Feeder

• For high capacity [up to 35,000 sq. ft. (3250m2)] low pressure
steam and hot water boilers with cold water feed
• Optional features
– No. 2 switch
– Manual reset
– Float block
• Proportional feed action
• Maximum water supply pressure 100 psi (7 kg/cm2)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum vessel pressure 35 psi (2.5 kg/cm2