What Is a Solenoid Valve and How Does It Work?

Solenoid valves are super important in hydraulic systems. They help control fluid movement with precision. In big machines like excavators, these valves are a must. They handle tasks like braking the swing motor, managing the main control valve, or directing the travel system. This ensures machines work safely and smoothly.

At Hantang, we focus on supplying top-notch hydraulic parts, including solenoid valves. We offer original, new, rebuilt, and high-quality aftermarket options for many excavator brands. This guide explains what solenoid valves are, how they work, and why picking the right ones matters for heavy equipment.

Introduction to Solenoid Valves

A solenoid valve is a device that uses electricity to control hydraulic fluid. It works by creating a magnetic field with an electric current. This field moves a part inside to open or close the valve. In excavators, solenoid valves manage important jobs like lifting the arm, turning the machine, or moving the tracks.

Hantang provides trusted solenoid valves for repair shops, traders, and manufacturers. We offer brand-new valves from factories and tested rebuilt ones. All are checked to work well with your machines.

Construction of a Solenoid Valve

A solenoid valve has a few key parts that make it work:

• Valve Body: The outer shell, usually made of brass or steel.
• Coil (Solenoid): A wire coil that makes a magnetic field to move things.
• Plunger (Armature): A metal piece that slides to open or close the valve.
• Spring: Pushes the plunger back when the power is off.
• Orifice: A small hole that lets fluid through or blocks it.

These parts are small but strong. They’re built to handle high pressure and work fast with little power.

How Solenoid Valves Work

When you send electricity to the coil, it creates a magnetic field. This field pulls the plunger up or down. That opens the orifice to let fluid flow. When the power stops, the spring pushes the plunger back. This closes the flow.

Common Configurations:

• Normally Closed (NC): The valve stays closed when off. Power opens it.
• Normally Open (NO): The valve stays open when off. Power closes it.

This simple on/off action is key in excavators. It helps control braking, arm lifting, or bucket movement quickly based on signals.

Applications in Excavator Hydraulic Systems

In excavators, solenoid valves are part of the directional control system. They manage how hydraulic oil flows to cylinders, motors, and brakes. This keeps the machine moving correctly.

For example:

• In travel systems, solenoid valves control braking or switch between fast and slow speeds.
• In slewing systems, they direct the motor to turn the machine and stop it from spinning backward.
• In safety locks, they keep the equipment still when not in use.

Hantang supplies solenoid valves that fit brands like SANY, KOMATSU, and HITACHI. Our parts are perfect for technicians or users needing reliable replacements.

Hantang’s Product Advantage

Since starting in 2016, Hantang has earned trust in the excavator parts world. We focus on “genuine new” parts and offer:

• Original new solenoid valves from trusted factory sources.
• Certified rebuilt valves, fully tested for performance.
• Used or budget options, clearly labeled for honesty.
• Flexible shipping and fair prices for both small and large orders.

We also help customers find the right valve. Just share your machine model, valve block number, or system details. Our team provides technical advice to make sure you get the perfect part.

Types of Solenoid Valves

Hydraulic systems in big machines use different kinds of solenoid valves:

• Direct-acting solenoid valves: Great for small flows and fast switching.
• Pilot-operated solenoid valves: Used in high-pressure systems with lots of fluid.
• Two-way and four-way valves: For simple on/off control or complex directional tasks.
• Latching solenoid valves: Save energy in certain setups.

Hantang stocks many solenoid valves for travel, boom, arm, and swing systems in excavators.

Why Quality Matters in Solenoid Valves

Advantages:

• Quick switching: They act fast to control fluid.
• Precise flow: They manage oil movement accurately.
• Small size: They fit in tight spaces.
• Remote control: They work with automated systems.

Risks of Low-Quality Valves:

• Coil burnout: Bad insulation can cause overheating.
• Stuck plunger: Poor machining makes it jam.
• Early failure: Weak parts break under pressure.
• Leaks: Bad seals let fluid escape.

Hantang focuses on “right part, right source.” We explain the quality of each option—new, rebuilt, or budget—so you can pick what fits your job.

Maintenance and Troubleshooting

Solenoid valves can have problems if not cared for. Common issues include:

• Dirty oil: Debris clogs the orifice or jams the plunger.
• Coil failure: Too much voltage or heat can burn it out.
• Seal damage: Worn seals cause leaks inside or outside.

Preventive Tips:

• Check wiring and voltage regularly.
• Use clean, filtered hydraulic oil.
• Test coil health with a multimeter.
• Replace coils or seals during routine maintenance.

Hantang offers help before and after your purchase. We guide you on troubleshooting solenoid valve issues and testing rebuilt parts.

Conclusion

Solenoid valves are like the unsung heroes of excavators. They make sure the machine starts, stops, brakes, and steers correctly. Their fast and accurate control is crucial for hydraulic systems.

At Hantang, we know quality parts are a must. That’s why we provide tested, clearly sourced solenoid valves for clients in China and around the world. Whether you need a brand-new valve or a rebuilt one, we’ve got you covered.

Need a reliable solenoid valve for your excavator? Contact Hantang today!

FAQs

Q1: Can I replace just the solenoid coil without replacing the whole valve?

A: Yes. If the coil is easy to reach and the valve body is okay, swapping the coil is a cheap fix.

Q2: How do I find the right solenoid valve for my excavator?

A: Give us the machine model, control valve number, or a photo. We’ll find the perfect match for you.

Q3: Does Hantang offer help with installation or testing?

A: You bet! We give advice on installing and testing all our solenoid valves—new, rebuilt, or used.