In industrial systems, ensuring uninterrupted fluid flow is critical to protecting equipment and maintaining safe, efficient operations. One of the most dependable tools for achieving this is the paddle type flow switch—a time-tested mechanical device that engineers trust for liquid flow monitoring, especially in pipelines, chillers, and pump systems.
This blog explores how a paddle type flow switch works, its key applications, and why it remains a preferred solution across industries for ensuring process continuity and safety.

What is a Paddle Type Flow Switch?
A paddle type flow switch is a mechanical flow switch designed to detect the presence or absence of flow in a piping system. It consists of a paddle (or vane) inserted into the pipe. When fluid flows through the pipeline, it moves the paddle. This movement activates a micro-switch, triggering an electrical signal that can be used to control pumps, activate alarms, or shut down equipment.
It offers simple yet effective flow detection without the need for complex electronics, making it ideal for rugged, high-reliability applications.

Key Features and Benefits
✅ No external power required – purely mechanical design
✅ Robust construction – ideal for harsh industrial environments
✅ Reliable performance – accurate switching at predefined flow rates
✅ Low maintenance – simple mechanism with few moving parts
✅ Cost-effective – budget-friendly for basic flow detection tasks
With these features, a paddle type flow switch delivers consistent and dependable performance, making it a vital safety and control device.

Typical Applications in Industrial Settings
The paddle type flow switch is widely used across a variety of industries, especially where cooling water or liquid flow control is critical:
1. Pump Protection
Prevents dry-running of pumps by ensuring that liquid flow is present before allowing pump operation.
Keyword: pump protection switch
2. Cooling Water Systems
Used as a cooling water flow switch to ensure that cooling loops are active before equipment starts—common in HVAC systems, chillers, and compressors.
3. Fire Safety Systems
Monitors water flow in sprinkler lines to detect activation or leakage.
4. Industrial Machinery
Provides a safeguard in heat exchangers, boilers, and CNC machines by confirming coolant flow.
5. Flow Alarms in Pipelines
Acts as a flow switch for pipelines to signal flow loss or trigger system shut-off.

Why Engineers Prefer Paddle Flow Switches
• Simplicity: No programming, wiring complexity, or calibration required
• Versatility: Compatible with various pipe sizes and flow rates
• Durability: Built to withstand vibrations, temperature fluctuations, and pressure changes
• Immediate Feedback: ON/OFF switching when flow crosses threshold
Whether you’re designing a new water-cooled equipment line or adding redundancy to an existing fluid system, the paddle type flow switch is a proven, engineer-friendly solution.

Installation and Configuration Tips
• Mounting Orientation: Typically installed horizontally in horizontal pipelines
• Pipe Size Compatibility: Ensure correct paddle length for the pipe diameter
• Set Point Selection: Choose based on minimum flow required to operate the switch
• Material Consideration: Use stainless steel paddles for corrosive or high-temperature applications
Proper installation is crucial for long-term, reliable performance of the mechanical flow switch.

ARCUS INDUSTRIES – Trusted Name in Flow Switches
At ARCUS INDUSTRIES, we offer high-quality paddle type flow switches engineered for industrial use. Our switches are:
• Designed for liquid flow monitoring in demanding environments
• Factory-calibrated for optimal response
• Built with corrosion-resistant materials
• Available in a range of sizes for diverse flow applications
Whether you need a flow switch for water, chemical systems, or HVAC installations, ARCUS has a reliable, field-tested solution ready for your process needs.

Conclusion
The paddle type flow switch continues to be an essential component for industrial flow monitoring, offering a simple, durable, and cost-effective solution for engineers who demand reliability. Its mechanical design ensures minimal maintenance while delivering dependable flow detection across a wide range of applications.
Looking for a reliable flow switch to protect your pumps, monitor flow, or control your process? Choose ARCUS paddle flow switches—engineered for precision, built for performance.