What is a Paddle Flow Switch?

What is a Paddle Flow Switch?

In many industrial and commercial systems, controlling and monitoring liquid flow is crucial for maintaining safety and performance. The paddle flow switch is one of the most common and reliable devices for this purpose. It detects the movement of fluid within a pipeline and provides a switching signal to protect pumps, chillers, and cooling systems from damage caused by abnormal flow conditions.

What is a Paddle Flow Switch?

A paddle flow switch is a mechanical device designed to detect and monitor the presence or absence of liquid flow in a pipeline. It typically consists of a paddle (or vane) inserted into the flow stream; when fluid moves, the paddle is deflected, triggering a switch to signal that flow is present. Paddle flow switches are widely used in systems that handle water, oil, and other liquids, making them an essential safeguard in HVAC, water treatment, and fire protection applications.

How Does a Paddle Flow Switch Work?

The working principle of a paddle flow switch is based on the mechanical movement of a paddle in response to liquid flow. When there is no flow, the paddle remains in its natural vertical position. As fluid begins to flow, it pushes the paddle, which then actuates a microswitch or magnetic reed switch through a transmission mechanism.

This switching action can be used to start or stop pumps, trigger alarms, or protect cooling systems from running dry — ensuring safe and efficient operation.

Applications of Paddle Flow Switches

Paddle flow switches are versatile devices used for flow monitoring and protection in a wide range of applications:

HVAC systems – to monitor water flow in cooling or heating circuits

Water treatment plants – to protect pumps from dry running

Fire-fighting systems – to ensure water circulation in sprinkler systems

Industrial process control – to maintain reliable liquid flow detection

Cooling and lubrication systems – to prevent overheating or pump damage

Their simple structure, stable performance, and low maintenance make paddle flow switches an ideal choice for many liquid control systems.

Types of Paddle Flow Switches

1. Target Paddle Flow Switch (Vane Type)

The Target Paddle Flow Switch is a mechanical device designed to detect and monitor liquid flow in pipelines. Using a paddle inserted into the pipe it provides a reliable switch signal to protect pumps, chillers, and cooling systems.

It is widely applied in HVAC, water treatment, fire-fighting systems, and industrial process control due to its durability and cost-effectiveness.

2. Explosion-Proof Paddle Flow Switch

The Explosion-Proof Paddle Flow Switch is specifically designed for hazardous areas. In the absence of flow, the paddle stays in its vertical position. When fluid starts to move, the impact force deflects the paddle, driving a magnetic reed switch via a transmission shaft to generate an electrical switching signal.

3. Baffle Paddle Flow Switch

The Baffle Paddle Flow Switch is an innovative design developed by ZINACA’s flow technology experts to overcome the limitations of conventional paddle switches.

With a simple and reliable structure, it integrates a built-in microswitch for precise flow detection and significantly improves performance and longevity compared to traditional types. It is suitable for demanding industrial environments requiring enhanced reliability.

How to Choose the Right Paddle Flow Switch

When selecting a paddle flow switch, several factors should be considered:

Type of medium (water, oil, or other liquid)

Flow rate and pipe diameter

Working pressure and temperature

Installation method (inline or threaded connection)

Required electrical output signal

Explosion-proof or environmental protection level

Choosing the correct type ensures optimal system safety and accuracy. If you’re not sure which model fits your needs, ZINACA’s professional technical team can provide detailed consultation and selection support.

Paddle Flow Switch Price

The price of a paddle flow switch varies according to factors such as model type, connection size, material, output options, and explosion-proof requirements.

The product price will change based on the actual specifications.

If you would like to know the latest price of ZINACA paddle flow switches, please feel free to contact us for an updated quotation.

Custom Paddle Flow Switch OEM

ZINACA Instruments offers OEM and customized solutions for paddle flow switches. Whether you need a special paddle length, connection type, or signal output, our engineering team can design the right product for your specific requirements.

We also provide branding and OEM support for distributors worldwide, helping partners deliver reliable, high-quality paddle flow switches under their own label.

Supplier of Paddle Flow Switch

As a professional manufacturer and supplier, ZINACA Instruments provides a full range of paddle flow switches, including target type, explosion-proof, and baffle type models.

Our products are ISO and CNAS certified, ensuring consistent quality and performance for customers in the HVAC, chemical, water treatment, and industrial automation sectors.