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McDonnell Miller

Series 194

• For commercial, and industrial low or high pressure steam boilers
• Maintains consistent water level regardless of pressure

Series 221

• For boiler receiver tanks

Series 247/247-2

• For steam and hot water boilers with cold water feed
• Continuous maintenance of minimum safe water level

Series 25-A

• For boiler receiver tanks
• Float operated

Series 250

• For tanks and hydronic heating systems
• Protects against over-pressure
• Minimizes hammering with flash steam
• Low differential pressure – 3 psi (.21 kg/cm²) between opening and closing
• Sizes and material
   – up to 2” NPT – cast iron body, brass seat
• EPDM...

Series 260

• For water tanks and hydronic heating systems
• Protects against over-pressure
• Minimizes hammering with flash steam
• Low differential pressure – 3 psi (.21 kg/cm²) between opening and closing
• Sealed spring chamber prevents scale or sediment buildup around seal
•...

Series 42S

• For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column

Series 47/47-2

• For steam and hot water boilers with cold water feed
• Continuous maintenance of minimum safe water level

Series 51-S/51-S-2

• For high capacity [up to 35,000 sq. ft. (3250m2)] low pressure steam and hot water boilers with cold water feed

Series 51/51-2

• For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed

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