Model 624

SKU: 624

Flow Switch, Inline Body, Full Swing Paddle

The Delta Controls Model 624 Flow Switch is highly reliable full swing, inline body switch. The paddle body fits into and becomes an unobstructed part of the pipeline. Model 624 is equipped with a full swing paddle and has an open bore matching the pipeline’s. The 624 has a flat blade-type paddle that rotates 90 degrees in response to increased flow rate. The switch actuates at a pre-calibrated set point. The paddle moves until it is flush against the pipeline wall. The body bore is unobstructed, and the flow is unrestricted. The 624 has a negligible pressure drop at high velocities for 2 inch to 8 inch (50 to 200 millimeter) pipelines with flow velocities possible in excess of 50 feet per second (15 meters per second).

The paddle is magnetically connected to the output switch. A heavy-duty solid sealing tube separates the process fluid from the switch mechanism, eliminating failures due to seal, diaphragm, bellows corrosion and leaks.


  • Non-restricting full open bore
  • Highly reliable magnetic coupling
  • Compact size


  • Style: Inline
  • Type: Paddle; Full Swing
  • Temperature: -4 °F to 400 °F (-20 °C to 204 °C)
  • Standard Pressure: ≤ +2000 psig (+137.9 bar)
  • Optional Pressure: +5000 psig (+344.7 bar)
  • Actuation: ≥ 7.0 gpm (26.7 L/min) (water)
  • De-actuation: ≥ 3.0 gpm (11.7 L/min) (water)
  • Accuracy: ≤ 10%
  • Output: SPDT or DPDT, 5 A
  • Wetted Material: 316 Stainless Steel, 400 Stainless Steel, carbon steel
  • Housing Material: Stainless steel, aluminum
  • Threaded Connection: 2 in to 4 in FPT
  • Flanged Connection: 2 in to 4 in
  • Flange Rating: ≤ 150 lb

Certifications & Approvals

  • Stainless Steel Housing Options Only: Third Party Listed by CSA NRTL/C (USA and Canada)

Required Ordering Information

  • Detailed model number
  • Complete application number
  • Tag or nameplate detail (if required)
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)
  • Basic Type - Switch Point - Switch Action - Flow Direction Max Pressure - Pipeline OD / ID - Dimension 'A' - Fluid SPG Fluid Viscosity - Name of Fluid - Normal Flow - Max Flow

Additional Information


Flow Switch, Inline Body, Full Swing Paddle

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