Mechanical Paddle Flow Switch NK01B

Brand：NOIKE-AH
Model：NK01B

Specification

Introduction

Is your equipment suffering from unexpected shutdowns due to insufficient liquid flow?

In industrial cooling systems, air compressors, refrigeration equipment, and automation machinery, maintaining stable flow is essential for protecting pumps, compressors, and heat exchangers. Without reliable flow monitoring, dry running, overheating, and equipment damage can occur.

The NOIKE-AH Mechanical Paddle Flow Switch is designed to detect liquid flow accurately and provide a reliable switching signal when the preset flow rate is reached. Featuring a mechanical paddle design, SPDT output, low pressure loss, and easy on-site adjustment, it is an ideal solution for industrial flow protection.

Common Flow Monitoring Problems

Many industrial systems experience problems such as:

Pumps running without sufficient water flow
Compressor cooling water interruption
Frequent equipment shutdowns caused by unstable flow
Difficult installation on different pipe sizes
High maintenance costs due to unreliable flow switches

These issues can reduce production efficiency and increase maintenance expenses.

How the NOIKE-AH Mechanical Flow Switch Solves These Problems

The NOIKE-AH Mechanical Paddle Flow Switch combines a spring-supported paddle with a precision micro switch.

When the flow reaches the preset value, the paddle moves and activates the SPDT switch, providing a reliable electrical signal for system control or equipment protection.

Its simple mechanical structure ensures excellent durability while completely isolating the mechanical and electrical components for improved reliability.

Key Features

Wide Flow Adjustment Range

The flow switch is supplied with five interchangeable paddles, allowing flexible adjustment for different pipe diameters and flow conditions.

Suitable for pipelines with diameters 25 mm and above.

Low Pressure Loss

The optimized paddle structure minimizes flow resistance.

Average pressure loss: only 0.08 bar at maximum flow.

This helps maintain efficient system operation.

Reliable SPDT Switching Output

The switch provides:

Normally Open (NO)
Normally Closed (NC)

Rated output:

250 VAC
3 A

Suitable for most industrial control systems.

Excellent Repeatability

Mechanical repeatability:

±2.5% of full scale

Stable switching performance helps reduce false alarms and improve equipment protection.

Durable Industrial Construction

Designed for harsh industrial environments.

Materials include:

Stainless Steel Paddle
Stainless Steel Body
Brass Process Connection
Brass Connecting Rod
NBR Seal
ABS Housing

These materials provide excellent corrosion resistance and long service life.

Technical Specifications

Parameter	Specification
Product Type	Mechanical Paddle Flow Switch
Flow Setting	Adjustable (See Flow Table)
Repeatability	±2.5% F.S.
Output	SPDT (NO + NC)
Electrical Rating	250 VAC / 3 A
Maximum Pressure	16 bar
Pressure Loss	0.08 bar (Max Flow)
Ambient Temperature	-25°C to 80°C
Medium Temperature	Up to 90°C
Process Connection	R1 Thread
Protection Rating	IP33

Size chart（mm）

Typical Applications

The mechanical paddle flow switch is suitable for both liquid and gas monitoring, including:

Industrial Automation Equipment
Air Compressor Cooling Systems
HVAC Systems
Refrigeration Equipment
Water Circulation Systems
Mechanical Equipment
Pump Protection
Cooling Water Monitoring
Industrial Process Control

Why Choose a Mechanical Paddle Flow Switch?

Compared with electronic flow sensors, a mechanical paddle flow switch offers several advantages:

✔ No external power required for flow detection

✔ Simple and reliable mechanical structure

✔ Low maintenance requirements

✔ Easy installation and adjustment

✔ Suitable for large-diameter pipelines

✔ Excellent anti-contamination performance

For many industrial water circulation systems, mechanical flow switches remain one of the most cost-effective flow protection solutions.

Why Choose NOIKE-AH?

NOIKE-AH specializes in industrial flow and pressure measurement solutions.

Our product portfolio includes:

Mechanical Flow Switches
Electronic Flow Switches
Flow Meters
Pressure Switches
Pressure Sensors
Pressure Transmitters
Digital Pressure Gauges

Every product is designed to deliver stable performance, reliable protection, and long service life for industrial applications.

Frequently Asked Questions (FAQ)

What is a mechanical paddle flow switch?

A mechanical paddle flow switch detects liquid flow using a spring-loaded paddle. When the flow reaches the preset value, it activates an internal SPDT micro switch to provide a control signal.

What pipe sizes is this flow switch suitable for?

It is designed for pipelines with diameters of 25 mm or larger and includes five interchangeable paddles for flexible installation.

What media can it monitor?

It is suitable for water, cooling liquid, non-corrosive liquids, and certain gases, depending on the application conditions.

Does it require external power?

No. The paddle movement is entirely mechanical. Only the switch output is connected to the control circuit.

Where is it commonly used?

Typical applications include air compressors, refrigeration systems, HVAC equipment, industrial automation, cooling water systems, and pump protection.

Conclusion

The NOIKE-AH Mechanical Paddle Flow Switch provides a simple, reliable, and cost-effective solution for industrial flow monitoring.

With its adjustable paddle design, SPDT output, low pressure loss, durable stainless steel construction, and excellent repeatability, it helps protect critical equipment and improve system reliability across a wide range of industrial applications.