LF55 Series Pressure Switch China Factory and Reliable Suppliers

Looking for high-precision LF55 pressure switches? Our China factory provides industrial-grade SPDT switches for pumps and RO systems. As leading suppliers, we offer durable phosphor bronze and brass construction for maximum safety and reliability.

Product Details

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Product Details

The LF55 series pressure switch is a high-precision automatic control device engineered to respond instantly to pressure signals, providing critical safety protection and operational automation for industrial systems. Designed for versatility, it is widely utilized in pumps, hydraulic machinery, and specifically optimized for reverse osmosis (RO) water treatment systems to ensure stable pressure management and equipment longevity.

Featuring a robust construction with phosphor bronze bellows and a brass pressure port, the LF55 ensures reliable performance in demanding environments. By leveraging a precision-engineered spring mechanism and SPDT switching, it allows operators to calibrate specific switching points accurately, ensuring that circuits are opened or closed exactly when predefined pressure thresholds are met.

Detailed Parameters

Voltage Rating	120V AC / 250V AC	Non-induced Current	20A / 10A
Full-load Induced Current	15A / 8A	Momentary Current	72A
Sensing Element	Phosphor Bronze Bellows	Pressure Port Material	High-Grade Brass
Switch Type	SPDT (Single Pole Double Throw)	Thread Standard	G 1/4" (Standard) / 7/16-20" (Optional)
Measurement Units	bar, psig, MPa, Kgf/cm2	Mounting Method	4x M4 Screws / Multi-purpose Plate

Key Advantages

Enhanced Safety

Acts as a critical safety fail-safe for hydraulic systems and pumps to prevent over-pressurization.

High Reliability

SPDT switch design ensures stable and consistent contact switching over thousands of cycles.

Precision Tuning

Easily adjustable spring tension allows for precise calibration of the switch point values.

RO System Optimized

Specially engineered for the strict pressure requirements of Reverse Osmosis water treatment.

Material Durability

Phosphor bronze and brass construction provide excellent resistance to wear and corrosion.

Flexible Installation

Supports multiple mounting options including standard brackets and customized capillary models.

Product Gallery

Management Platforms

Range Selection

Wide variety of models from LF5502 to LF5542 covering ranges from -0.5 to 42 bar.

Reset Modes

Available in standard automatic reset and "M" series Manual Reset for higher security.

Custom Fittings

Optional British threads (E), welding models (C), or capillary tubes (S) for custom setups.

Chemical Compatibility

Special "B" model available specifically for Ammonia refrigerant environments.

Quick Mounting

Integrated M4 screw holes and multi-purpose plates for rapid equipment integration.

Scale Versatility

Dual-unit scale plates supporting bar, psig, MPa, and Kgf/cm2 for global standards.

Investment Return Comparison

Performance Metric	Standard Switches	LF55 Pro Series	Business Value
Calibration Precision	General Range	Adjustable Screw Tuning	Reduced Setup Time
Component Lifespan	Standard Alloys	Phosphor Bronze/Brass	Lower Replacement Cost
System Safety	Basic On/Off	Precision Differential	Prevented Equipment Failure
Installation Speed	Custom Brackets	Standard M4/Plate	Lower Labor Expenses
Application Range	Limited	RO / Ammonia / Hydraulic	Unified Inventory

Frequently Asked Questions

Q: How do I adjust the switching point of the LF55 pressure switch?

By adjusting the adjustment screw, you can modify the spring tension. Screwing it in deeper increases the spring force, which subsequently increases the pressure value at which the switch activates.

Q: Is this pressure switch suitable for water pollution monitoring equipment?

Yes, it is widely used in Reverse Osmosis (RO) systems and other water treatment infrastructures common in water pollution prevention and monitoring.

Q: What is the difference between the LF55 standard and "M" models?

The standard models feature automatic resetting, while the "M" models (e.g., LF5506M) are equipped with a Manual Reset function for enhanced safety control.

Q: Can the LF55 be used with ammonia refrigerants?

Yes, we offer a specific Ammonia refrigerant model. To order this, add the suffix "B" to the model number (e.g., LF5506B).

Q: What installation precautions should I take to avoid damage?

We strongly recommend using two spanners during installation to avoid twisting and damaging the controller body. Use the provided M4 screws or the multi-purpose mounting plate.

Q: Which thread options are available for international projects?

The standard version is G 1/4", but we provide an optional 7/16-20" version and can add British threads (suffix "E") based on custom requirements.

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FAQS

What's the MOQ?

1set sample is available.

What's your price?

We quoted based on your products’ code and qty. We can offer different discount depending on qty.

I am not sure of the required product type, how to get quotation?

Please tell us the details of your project: Measuring range, temperature, pressure, If need relay control output, 4-20mA or Modbus RS485 output? We will choose suitable product type as per your project details and make quotation for you.

How long is your delivery time?

Most of our products are in stock. Generally, we can delivery to you within 2-3 working days. The big order’s delivery time will be determined according to the type and quantity of products ordered.

What’s your term of payment?

We accept T/T, Paypal, Western Union, Alipay, credit card, wechat and other suitable payment.

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