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WL3870 Tubular Linear Solenoid for Automation Solutions

A Tubular Linear Solenoid is an electromagnetic actuator that converts electrical energy into precise linear motion. It is made up of a cylindrical coil, magnetic housing, movable plunger, return spring and guide shaft. An electromagnet, formed by applying DC voltage to a cylindrical coil, produces a magnetic field that attracts or repels the plunger in a linear direction. Then the electrical energy is disconnected, and the spring brings the plunger to the starting position.

The Tubular Linear Solenoid features an enclosed magnetic circuit that is more efficient than the conventional open-frame solenoid. It has stronger output force, lower noise and better durability. They are also compact in design and protect internal parts from dust and contamination and are hence ideal for harsh industrial environments.

Tubular Linear Solenoids are widely used in industrial automation, medical equipment, packaging machinery, vending machines, textile machinery, smart locks, security systems, agricultural equipment, automotive devices and precision control systems where fast, reliable & repeatable linear motion is required.

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Tubular Linear Solenoid Product Overview

Tubular Linear Solenoids are compact electromagnetic actuators designed for high-performance linear motion. They are made with precision-wound copper coil, durable magnetic housing, precision-machined plunger, return spring and strong guide components assembled in a sealed cylindrical form. The design provides strong magnetic force, smooth operation and long-term reliability.

Tubular Linear Solenoids come in many sizes and custom configurations to satisfy different voltages, strokes, force outputs, duty cycles and mounting possibilities. Manufacturers also provide customized lead wires, connectors, shafts, springs and surface treatments for specific application needs.

The Tubular design is more efficient than the traditional open-frame solenoids, offers better magnetic shielding, loses less energy, operates more quietly and better resists dust and contaminants. This makes them good candidates for continuous industrial operation and precise equipment.

How does a Tubular Linear Solenoid work?

The principle of operation of a Tubular Linear Solenoid is the electromagnetic attraction. When electricity flows through the copper coil , it creates a magnetic field inside the tubular housing . This magnetic field pulls the steel plunger towards the center of the coil, causing linear motion. The tubular solenoid is either repelling or attracting . When the electrical energy is off , the spring brings the plunger back to the initial position. This very simple principle of operation allows fast response, accurate positioning and reliable operation. The contained magnetic circuit minimizes energy losses, maximizes efficiency and maintains consistent force output over millions of operating cycles.

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Tubular Linear Solenoid Technical Datasheet

Brand	Weilong Technology	Model Number	WL 3970
Rated Voltage (V)	DC 12 or 24 V	Rated Power(W)	10–15 W
Work Model	100 000 Lifespan Cycles	Push PUll Force (N)	1000 Gf
Stroke(mm)	10–20 MM	Reset Time(s)	1 S 3S Off
Service Life	300 Thousand Times	Certification	CE,ROHS,ISO9001,
Material	Carbon Steel Housing with Zinc Plated Coating	Lead Wire Length(mm)	200
Install Style	both side with three mounted Screw Holes for easy setting up	Tolerance of Dimension	+/- 0.1 MM
Water-proof	None	Insulation Class	F Cel. 150 Degree
Hi-Pot Test	AC 600V 50/60Hz 1 s	Non-excitation Holding Force	0
Working Temperature	-10°C-100°C	Duty Cycle	1-100%
Thread Depth(mm)	/	Payment Term	TT, or LC At Sight
Sample Order	Yes	Warranty	1 Year
MOQ	500 pcs	Supply Ability	5000 pcs per Week
Delivery Time	30 Days	Port of Loading	shenzhen

Main features of linear tubular solenoids

Tubular Linear Solenoids are compact and cylindrical in form, offering reliable linear movement with high magnetic efficiency. They feature fast response time, low noise and long service life. They are available in push or pull action and can be customized for voltage, stroke and force. The plungers are precision-machined for smooth movement and the copper coils are high-quality for excellent electrical performance. Optional waterproof, dustproof and continuous-duty versions for harsh environment operation. The enclosed construction makes them ideal for industrial automation and precise control applications with increased durability and safety.

Tubular Linear Solenoid Industrial Application

Tubular Linear Solenoids are widely used to create fast, reliable and repeatable linear motion with minimum maintenance in various industrial applications. For industrial automation, they are used to control gates, locks, positioning systems, sorting systems, robotic systems and assembly machines. Tubular solenoids are used in packaging machines for sealing, labeling, dispensing and product handling. Precision solenoids are used in medical devices to control pumps, analyzers, infusion systems, laboratory equipment and diagnostic systems.

Automotive applications for tubular linear solenoids include transmission systems, fuel control, locking systems and emission control systems. Their compact construction and reliable operation also make them good choices for smart home products such as electronic locks, intelligent cabinets, vending machines and access control systems.

Heavy duty tubular solenoids are used in agricultural machinery for hydraulic control, valve operation and automatic feed systems. They are used in textile machines for thread control and fabric positioning. Food processing equipment uses food grade tubular solenoids for sorting, dispensing and packaging applications. Tubular solenoids are used in security equipment such as turnstiles, barriers, safes and cash handling systems.

Tubular Linear Solenoids continue to replace traditional mechanical actuators in modern automation systems due to their compact, durable, energy efficient and highly customizable nature improving productivity, minimizing maintenance costs and increasing reliability of operation

Advantages and Disadvantages of Tubular Linear Solenoid

There are many advantages of Tubular Linear Solenoids that make them popular for industrial applications. The enclosed magnetic circuit is more efficient than open frame and provides more force with less energy. The compact cylindrical design protects the internal components from dust, moisture and contamination, providing increased life and less maintenance. They are fast and quiet, providing precise linear movement ideal for automation, medical devices, security systems and industrial machinery. Customizable options include voltage, stroke, force, mounting methods and connectors for easy incorporation in various equipment.

However, Tubular Linear Solenoids also have some limitations. When the stroke length increases, force output decreases so they have to be properly engineered when choosing the product. In continuous duty operation heat may be generated if the coil is not properly designed or controlled. Compared with electric cylinders or pneumatic actuators, they usually provide limited linear movement. Too much voltage, wrong duty cycle or insufficient ventilation will shorten the operational life. Higher force will require larger or special heavy duty designs adding cost and installation space.

However, in most industrial automation applications Tubular Linear Solenoids provide reliable and maintenance-free operation if properly chosen.

Troubleshooting Tubular Linear Solenoid

In case the Tubular Linear Solenoid works improperly, check the power supply to find whether the rated voltage is provided to the coil. Use a multimeter to measure the coil resistance and find open or short circuits. Inspect wiring, connectors and terminals for loose connections and corrosion.

If the plunger moves slowly or sticks, check the guide shaft for contamination, rust and mechanical damage. Clean the moving parts and make sure that the return spring works properly. Overvoltage, wrong duty cycle or insufficient ventilation will lead to overheating. Reduce operating time or improve the cooling, if required.

Weak magnetic force may be caused by too long stroke, wrong voltage, worn-out parts and magnetic air gap due to improper assembly. Ensure that the plunger moves freely and that the mounting is properly aligned.

Loose mounting hardware, damaged bearings and worn internal parts may result in noise or vibration. Replace all the defective parts promptly to prevent additional damage.

Preventive maintenance operations such as cleaning, electrical inspection, measuring of resistance and operating tests will contribute to the increased service life and minimized unexpected downtime. All the operating specifications of the manufacturer have to be followed to ensure reliable operation in the long run

8 Common Tubular Linear Solenoid Questions & Answers

1. What is a Tubular Linear Solenoid?

A Tubular Linear Solenoid is a cylindrical solenoid with linear motion.

A Tubular Linear Solenoid is an electromagnetic actuator that converts electrical energy into linear mechanical motion. It includes a cylindrical coil, magnetic housing, movable plunger and a return spring. Energized, the magnetic field moves the plunger to perform pushing or pulling. Thanks to their compact design, high efficiency and long service life, tubular linear solenoids are widely used in industrial automation, medical devices, security systems, packaging machinery and smart equipment.

2. What Is the Difference Between a Tubular Solenoid and an Open-Frame Solenoid?

The Tubular Linear Solenoid features a completely enclosed magnetic circuit providing higher magnetic efficiency, greater output force, less noise and better protection from dust and contamination. The open-frame solenoids expose their magnetic components, making them cheaper and easier to manufacture. However, they tend to generate lower force and are more susceptible to the environment. Tubular solenoids are widely used in tough industrial applications requiring durability and accuracy.

3. How to Choose the Right Tubular Linear Solenoid?

Choosing the right Tubular Linear Solenoid engineers should pay attention to such parameters as operating voltage, stroke length, force required, duty cycle, response time, mounting dimensions, ambient temperature and operating environment. Engineers also have to consider the force required at the actual working stroke rather than maximum holding force. Choose an experienced manufacturer that provides engineering assistance and customization to ensure reliable operation and long service life.

4. Can I Operate the Tubular Linear Solenoid Continuously?

Yes, but only if it is designed for continuous-duty (100% Duty Cycle) operation. Continuous-duty models use special high-temperature insulation materials, optimized copper coils and advanced heat dissipation to prevent overheating. The standard intermittent-duty solenoids are not designed for continuous energization. Overheating may shorten the coil life or cause permanent damage. Always make sure that the duty cycle is correct when choosing a solenoid for your application.

5. But the Pull Force Decrease? Why Does the Stroke Increase?

The Tubular Linear Solenoid produces the greatest magnetic force when the plunger is the closest to the center of the coil. As the stroke length increases, the magnetic air gap becomes larger, decreasing magnetic attraction and output force. This is the normal property of the electromagnetic actuator. Manufacturers usually provide force vs. stroke charts to help the engineers choose the proper solenoid for the required operating position.

6. What Are the Industrial Applications of Tubular Linear Solenoid?

Tubular Linear Solenoids are widely used in industrial automation, packaging machines, medical devices, textile machines, vending machines, agricultural machinery, automotive devices, smart locks, security devices, laboratory instruments, food processing equipment, robotics and access control systems. Thanks to their compact size, fast response and reliable operation, they are an excellent choice for applications requiring precise linear motion.

7. Why Does a Tubular Linear Solenoid Overheat?

Overheating may be caused by high voltage, wrong duty cycle, insufficient ventilation, high ambient temperature or high operating frequency. Excess heat generation may be caused by improper coil design or wiring. Always use the operating voltage specified, follow the recommended duty cycle, provide sufficient cooling and choose a continuous-duty version when required to prevent overheating.

8. Can Tubular Linear Solenoids Be Customized?

Yeah. Most professional manufacturers provide full OEM and ODM customization. Customers may specify operating voltage, stroke length, pulling force, pushing force, plunger design, return spring, mounting method, lead wire length, connectors, surface treatment, waterproof protection and duty cycle. Custom Tubular Linear Solenoids are often used in industrial automation, medical devices, automotive applications, security systems and specialized equipment for specific purposes.

How to Prevent Mistakes in Choosing a Tubular Linear Solenoid

Improper Tubular Linear Solenoid choice may result in poor performance, overheating and premature failure. One of the common mistakes is to choose a solenoid based on maximum force ignoring the force needed at the working stroke. Always look at the force vs. stroke chart since magnetic force changes along the stroke.

Another mistake is to ignore the duty cycle. A solenoid intended for intermittent duty may overheat if used continuously. Always adjust the duty cycle to the operating conditions of the application.

Engineers also have to consider the environment , ambient temperature, available installation space and supply voltage. Dust, moisture, vibration and high temperatures may require special sealing or high temperature coil design.

Do not underestimate mounting methods, length of lead wire, type of connector and response time. These parameters may considerably affect installation and long-term reliability.

Lastly, cooperate with an experienced manufacturer that provides custom engineering assistance, prototypes testing and technical recommendations. The proper choice of the product will reduce maintenance costs, improve the performance of the equipment and increase its service life.

How to Select a Tubular Linear Solenoid

When selecting a Tubular Linear Solenoid, the following technical parameters shall be considered to ensure reliable operation and long service life.

First, determine the operating function required. Decide on the push or pull type solenoid and the stroke length needed. The magnetic force is not constant throughout the stroke. Find the minimum force required at the actual working position, not maximum holding force.

Then choose the proper working voltage, such as DC 12V, DC 24V or any other customized voltage. The power supply shall be matched to the coil specifications to prevent overheating or lack of force.

Another important parameter is duty cycle. For applications requiring continuous duty, special coils with efficient heat dissipation shall be used; for higher force intermittently, more powerful coils shall be used. Consider operating frequency, ambient temperature and ventilation conditions.

The mechanical parameters are also worth being considered. Pay attention to the mounting holes, installation space, shaft diameter, connector type and lead wire length.

Environmental parameters have to be considered as well. If the application requires operation in dust, moisture, oil, vibration or corrosive environment, special sealing, stainless steel parts or surface treatment may be required.

Engineers shall consider the required service life in terms of operating cycles. Industrial automation systems require over 1,000,000 operating cycles and hence the quality of materials and manufacturing precision is crucial.

The solenoid may be customized according to unique project needs with such options as voltage, stroke, force, connector type, spring force, mounting and surface treatment.

Lastly, select a manufacturer with solid engineering experience, full testing facilities, ISO certified quality management and extensive OEM experience. Reviewing technical drawings, prototype samples, performance data and life-cycle test results before mass production ensures that the Tubular Linear Solenoid chosen will provide reliable, efficient and cost-effective operation during its entire service life.