Xylem 51-2-HD McDonnell & Miller Head Mechanism for Series 51-2 Water Feeder

The Xylem 51-2-HD (part number 135100) is a replacement head mechanism designed specifically for McDonnell & Miller Series 51-2 mechanical water feeders and low water cut-off (LWCO) systems. This heavy-duty component is engineered for low-pressure steam and hot water boilers with capacities greater than 5,000 square feet that utilize cold water feed.

Key Features:

• Complete head mechanism assembly - includes everything except the float chamber
• Equipped with No. 2 automatic reset switch for LWCO function
• Quick-change design allows replacement without disrupting piping
• 1-inch NPT female threaded connections
• Replaceable cartridge valve and strainer for easy maintenance
• Proportional feed action for precise water level control
• Robust construction for industrial and commercial applications

Specifications:

• 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)
• Connection type: Screwed (NPT)
• Connection size: 1 inch
• Weight: 19 lbs

This genuine Xylem-McDonnell & Miller head mechanism provides reliable performance and long-lasting durability for demanding boiler control applications. Installation is straightforward - simply remove the bolts on the existing float chamber, remove the old head mechanism, and install the new unit for minimal downtime.