NOIKE-AH Mechanical Paddle Flow Switch NK01D

Mechanical Paddle Flow Switch NK01D for Pipes ≤50 mm | SPDT Flow Switch for Water, Oil & Air

Brand：NOIKE
Model：NK01D

Specification

Product Overview

The NOIKE-AH Mechanical Paddle Flow Switch NK01D is a reliable mechanical flow monitoring device designed for pipe diameters up to 50 mm. A spring-supported paddle detects fluid movement, and when the flow reaches the preset switching point, it mechanically actuates an internal microswitch to provide a stable switching output.

With online installation, low pressure loss, excellent repeatability, and tool-free flow adjustment via the external knob, this flow switch provides dependable protection for pumps, compressors, cooling systems, and industrial process equipment. The mechanical sensing mechanism is completely isolated from the electrical components, improving reliability and service life.

Key Features

Spring-supported mechanical paddle design
Suitable for water, oil, and air applications
Online installation without removing the pipeline
Low pressure loss during operation
Adjustable switching point using external knob
High repeatability (±2.5% of full scale)
Mechanical and electrical parts completely isolated
Strong resistance to contamination and fouling
SPDT output (Normally Open + Normally Closed)
Optional IP67 protective enclosure

Working Principle

The Mechanical Paddle Flow Switch NK01D uses a spring-loaded paddle mechanism installed directly in the pipeline.

When fluid begins flowing, it pushes the paddle against the calibrated spring force. Once the flow reaches the preset value, the paddle moves sufficiently to activate the internal microswitch, generating a switching signal.

As the flow decreases below the preset point, the spring returns the paddle to its original position and the switch resets automatically.

Because the sensing mechanism is purely mechanical, the switch operates reliably without complex electronics and provides consistent performance in industrial environments.

Technical Specifications

Parameter	Specification
Measuring Principle	Spring-supported paddle
Suitable Media	Water, Oil, Air
Pipe Size	≤50 mm
Flow Setting	Refer to selection table
Repeatability	±2.5% Full Scale
Output	SPDT (Normally Open + Normally Closed)
Contact Rating	250 VAC, 3 A
Maximum Pressure	16 bar
Ambient Temperature	-25°C to +85°C
Medium Temperature	Up to 90°C
Protection Rating	IP33 (Optional IP67 Protective Housing)
Wiring	Terminal connection

Materials

Component	Material
Main Body	Stainless Steel
Process Connection	Brass
Connecting Rod	Brass
Paddle	Brass
Seal	NBR
Housing	ABS
Optional Protective Housing	IP67 Enclosure

Typical Applications

The Mechanical Paddle Flow Switch NK01D is suitable for both liquid and gas monitoring, including:

Industrial automation systems
Mechanical equipment
Air compressors
HVAC systems
Refrigeration equipment
Cooling water circulation
Pump protection
Lubrication systems
Water treatment equipment
General industrial process control

Advantages

Reliable mechanical operation
No complex electronics in the sensing mechanism
Excellent anti-fouling performance
Minimal pressure loss
Fast installation
Adjustable switching point
Stable switching performance
Long service life
Cost-effective flow protection solution

Installation Recommendations

For optimum performance:

Install according to the marked flow direction.
Ensure the paddle moves freely inside the pipeline.
Select the appropriate paddle size for the pipe diameter.
Tighten process connections securely to prevent leakage.
Adjust the switching point after installation according to system requirements.
Periodically inspect the paddle if the medium contains excessive debris or particles.

Industries Served

Industrial Automation
HVAC
Air Compression
Refrigeration
Manufacturing
Water Treatment
Pump Systems
Chemical Processing
Machinery Manufacturing
Process Engineering

Frequently Asked Questions (FAQ)

What media can this flow switch monitor?

It is suitable for water, oil, and air, making it ideal for both liquid and gas applications.

What is the maximum pipe size supported?

This model is designed for pipes up to 50 mm in diameter.

Does the switch require an external power supply?

No. The flow detection mechanism is purely mechanical. Power is only required by the external control circuit connected to the microswitch contacts.

Can the switching point be adjusted?

Yes. The flow setpoint can be easily adjusted using the external adjustment knob.

Is it suitable for pump dry-run protection?

Yes. It is commonly used to detect insufficient flow and protect pumps from dry running.

What electrical output does it provide?

The switch provides an SPDT (Normally Open + Normally Closed) output with a 250 VAC, 3 A contact rating.

What protection rating is available?

The standard protection rating is IP33, with an optional IP67 protective enclosure for more demanding industrial environments.

Why Choose the NOIKE-AH Mechanical Paddle Flow Switch NK01D?

The NOIKE-AH Mechanical Paddle Flow Switch combines a simple, proven mechanical design with reliable switching performance, low pressure loss, and easy adjustment. It is an excellent choice for industrial flow monitoring, equipment protection, and automation systems where dependable operation and low maintenance are essential.