Xylem-McDonnell & Miller FS7-4 Industrial Liquid Flow Switch
The Xylem-McDonnell & Miller FS7-4 (Part Number 119700) is a heavy-duty industrial liquid flow switch engineered for reliable flow detection in demanding hydronic, boiler, and process piping systems. Featuring a 1-1/4″ NPT connection and a rugged SPDT snap-action switch mechanism, the FS7-4 delivers precise, repeatable switching performance across a wide range of liquid flow applications.
Key Features
- 1-1/4″ NPT pipe connection for straightforward installation into standard piping systems
- SPDT (Single-Pole, Double-Throw) snap-action switch for reliable make/break control
- Rated for up to 300 PSI maximum working pressure — suitable for high-pressure industrial and commercial systems
- Trimmable bronze paddles allow field adjustment to match a variety of pipe sizes and flow rates
- Industrial-grade construction designed for long service life in liquid flow sensing applications
- Part Number: 119700
Applications
- Hydronic heating and cooling systems
- Boiler flow protection and interlock circuits
- Chilled water and condenser water systems
- Industrial process piping requiring flow verification
- Pump protection and flow proving circuits
Specifications
- Brand: Xylem-McDonnell & Miller
- Model: FS7-4
- Part Number: 119700
- Connection Size: 1-1/4″ NPT
- Switch Type: SPDT Snap Switch
- Maximum Working Pressure: 300 PSI
- Paddle Material: Bronze (trimmable)
The FS7-4’s trimmable bronze paddles make it exceptionally versatile — technicians can cut the paddles to length in the field to optimize sensitivity for the specific pipe diameter and fluid velocity of the application. Trust the McDonnell & Miller name for proven flow switch reliability in commercial and industrial HVAC and process systems.
