China Manufacturer CE Approved Pure Mechanical Design Hfs-25 Water Flow Switch

• Customization: Available
• Type: Mechanical
• Usage: Control Switch, Water Flow Switch
• Model NO.: PC-310
• Application: HVAC and Industrial Cooling Systems
• Explosion-proof Type: Flameproof
• Contact Type: Spdt
• Certification: CE
• Model No.: Hfs-25
• Interface Specification: G1" (1 Inch) Threaded Interface
• Rated Load: AC250V 2.5A/AC125V 5A/DC230V 0.15A
• Insulation Resistance: >100MΩ (DC 500V)
• Withstand Voltage Rating: AC 1500V / 1 Minute
• Operating Pressure: 10 Bar (1.0 MPa)
• Pressure Resistance Limit: 17.5 Bar (1.75 MPa)
• Medium Temperature: -40℃~100℃ (Non-Icing Condition)
• Compatible Media: Water, Ethylene Glycol, Lubricating Oil etc.
• Contact Life: 1,000,000 Cycles
• Blade Material: 304 Stainless Steel
• Body Material: Brass(Interface)+ABS Engineering Plastic(Shell)
• Protection Rating: IP54
• Transport Package: Carton Packaging
• Specification: HFS-25
• Trademark: Thermal International
• Origin: China
• Package Size: 15.00cm * 9.00cm * 6.00cm
• Package Gross Weight: 0.400kg

Product Description

Product Description

China Manufacturer CE Approved Pure Mechanical Design HFS-25 Water Flow Switch 

This is the HFS-25 vane-type (target-type) water flow switch, a core component for fluid control in industrial pipelines. Its core function is to monitor the liquid flow rate within the pipeline through mechanical sensing. When the flow rate reaches or falls below a set threshold, the switch contacts are triggered, enabling equipment interlocking protection or flow alarm. It is widely compatible with industrial fluid control systems.

Working Principle:

Employing a purely mechanical, non-electrical sensing design, the core logic is "fluid dynamic pressure drive - mechanical linkage - contact on/off":

I. As fluid flows along the pipeline, it impacts the stainless steel vane extending into the pipeline. The resulting dynamic pressure overcomes the spring preload, causing the vane to deflect.

II. The vane deflection is transmitted to the top microswitch via an internal linkage mechanism, triggering the single-pole double-throw (SPDT) contact.

III. When the flow rate drops to the reset threshold, the spring drives the vane back to its original position, and the contact automatically returns to its initial state.

IV. Different trigger flow rates can be set by adjusting the internal fine-tuning screw to adapt to diverse pipeline conditions.

Product Features:

1) High Reliability: Purely mechanical structure, no electronic components, unaffected by electromagnetic interference or lightning surges, zero drift in high-humidity, dusty industrial environments, suitable as a safety redundancy component for critical systems;

2) Flexible Adaptability: Equipped with multiple sizes of stainless steel blades (compatible with 1"~6" pipe diameters), supporting precise flow threshold adjustment to meet different pipeline flow control needs;

3) Easy Installation: Threaded direct connection design, no complex wiring required, includes installation accessories, allowing for quick pipeline integration and maintenance-free operation;

4) Certification and Compliance: CE certified, compliant with industrial electrical safety standards, suitable for most domestic and international industrial scenarios.

Specification

Product Name	Paddle Type Water Flow Switch
Model Number	HFS-25
Interface Specifications	G1" (1 inch) threaded interface, compatible with DN25 piping.
Electrical Performance	- Contact Type: SPDT (Single Pole Double Throw, supports normally open/normally closed switching) - Rated Load: AC 250V 2.5A / AC 125V 5A / DC 230V 0.15A - Insulation Resistance: >100MΩ (DC 500V) - Withstand Voltage Rating: AC 1500V / 1 minute
Fluid Parameters	I. Operating pressure: 10 bar (1.0 MPa) II. Pressure resistance limit: 17.5 bar (1.75 MPa) III. Medium temperature: -40℃~100℃ (non-icing condition) IV. Compatible media: Water, ethylene glycol, lubricating oil, and other non-corrosive, non-hazardous liquids that do not corrode brass/stainless steel.
Mechanical Properties	- Contact life: 1,000,000 cycles - Blade material: 304 stainless steel - Body material: Brass (interface) + ABS engineering plastic (shell) - Protection rating: IP54
Installation Requirements	I. Installation location: Horizontal piping (recommended) or vertical piping (only applicable for upward water flow) II. Straight pipe requirements: ≥5 times the pipe diameter upstream and downstream to ensure stable flow.

Application Scenarios:

- HVAC: Water flow monitoring for central air conditioning chillers, cooling towers, and fan coil units to prevent dry burning;
- Industrial Cooling Systems: Flow interlock protection for machine tool spindle cooling, industrial chillers, and electroplating production line cooling circulation;
- General Industrial Fluid Control: Flow status detection and alarm for water treatment equipment, boiler feedwater systems, and hydraulic pump stations;
- Commercial Equipment: Water flow start/stop control for water heaters, heat pumps, and pure water machines.

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Packaging & Shipping

Certifications

FAQ

FAQ

Q1 Are you trader? 
A1 We are factory.
 
Q2 What's your lead time for 5000pcs?
A2 We need around 20days after down payment received. .
 
Q3 You payment term?
A3 We accept LC, T/T 20% remittance +80% before delivery, DP.
 
Q4 Can we print our LOGO on heating element?
A4 Yes.
 
Q5 Do you offer guarantee? 
A5 Yes. We offer 1 year guarantee.