The McDonnell & Miller 51-2 Mechanical Water Feeder with #2 Switch (Part Number: 135000) is a combination float-operated make-up water feeder and low water cut-off designed for low-pressure steam and hot water boilers with capacities exceeding 5,000 square feet. It ensures continuous maintenance of the minimum safe water level, independent of electrical service, thereby enhancing boiler safety and efficiency. This unit features a quick-change replaceable cartridge valve and strainer, facilitating easy maintenance. The included #2 switch adds a low water cut-off function, providing automatic reset capabilities. The 51-2 is suitable for systems with a maximum water supply pressure of 150 psi, a maximum inlet water temperature of 120°F (49°C), and a maximum vessel pressure of 35 psi. Optional features available for this model include manual reset, float block, and proportional feed action, allowing customization to specific system requirements. The 1-inch threaded connection ensures compatibility with standard boiler piping configurations.
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| Manufacturer | McDonnell & Miller |
| Model | 51-2 |
| Part Number | 135000 |
| Application | Low-pressure steam and hot water boilers over 5,000 sq. ft. capacity |
| Function | Mechanical water feeder and low water cut-off |
| Switch Type | #2 Switch (Automatic Reset) |
| 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 Size | 1″ Threaded (NPT) |
| Optional Features | Manual reset, float block, proportional feed action |
| Dimensions (Width x Height) | 9″ x 10.375″ |
| Electrical Ratings | 10.2 A @ 120 VAC; 5.1 A @ 240 VAC |