Types of Hydraulic Valves

Hydraulic valves are the control centre of any hydraulic system, directing fluid flow, managing pressure and regulating speed across various applications. Whether you’re operating a tipper lorry, managing industrial machinery or maintaining mobile plant equipment, understanding the various types of hydraulic valves is essential for optimal system performance.

Categories of Hydraulic Valves

At BSP, we supply hydraulic valves that are broadly divided into two main categories: directional control valves and auxiliary valves. Each serves a unique purpose within your hydraulic system.

Directional Control Valves

Directional control valves control fluid movement, directing flow to where it’s needed such as to or from actuators like hydraulic motors and cylinders.

Common applications include:

• Operating hydraulic cylinders on excavators
• Controlling the movement of tipper bodies on lorries
• Managing the extension and retraction of boom arms
• Directing flow in agricultural machinery

Directional control valves come in various configurations including 2-way, 3-way or 4-way designs, depending on the number of ports and the complexity of the operation required. Many modern systems utilise solenoid directional valves for remote operation and rapid response times.

Auxiliary Valves

Whilst directional control valves determine where fluid goes, auxiliary valves manage how that fluid acts within the system. These valves provide critical functions including pressure protection, flow regulation, load control or system safety.

Types of Auxiliary Valves

Let’s examine the key auxiliary valve types and their specific functions:

1. Relief Valves

Relief valves are essential safety components that protect your hydraulic system from dangerous overpressure conditions. They work by automatically diverting excess fluid back to the reservoir when system pressure reaches a certain limit.

Why they matter: Without proper relief valve protection, excessive pressure can damage expensive pumps, burst hoses and cause system failures. Relief valves act as a safety net, ensuring your equipment operates within safe parameters.

2. Check Valves

Check valves, also known as non-return valves, allow fluid to flow in one direction whilst preventing reverse flow. Pilot-operated check valves offer additional control, using external pressure signals to release the valve when needed.

Common uses:

• Maintaining pressure in vertical cylinders to prevent load drift
• Protecting pumps from reverse flow
• Isolating sections of hydraulic circuits
• Supporting load-holding applications

3. Overcentre Valves

Overcentre valves (sometimes called counterbalance valves) are critical for safety in load-holding applications. They provide controlled lowering of loads whilst preventing dangerous runaway conditions.

Available in both single overcentre and double overcentre configurations, these valves are particularly important in:

• Tipper trucks and trailers
• Aerial work platforms
• Cranes and material handlers
• Any application where a load must be held safely in position

Double overcentre valves offer independent control of both extension and retraction, making them ideal for complex circuits requiring precise load control in both directions.

4. Flow Control Valves

Flow control valves regulate the rate at which hydraulic fluid moves through your system, directly controlling the speed of actuators. This precise speed control is needed in applications where smooth and consistent movement is required.

Benefits include:

• Consistent cycle times in production machinery
• Smooth operation of mobile equipment
• Energy efficiency through optimised flow rates
• Protection of sensitive loads from jerky movements

5. Ball Valves

Hydraulic ball valves provide quick and reliable on/off control within hydraulic circuits. Using a ball mechanism, these valves offer minimal pressure drop and can handle high-pressure applications with ease.

Their robust construction and simple operation make them ideal for isolation purposes, allowing technicians to safely service portions of a hydraulic system without shutting down the entire operation.

6. Diverter Valves

Diverter valves (also called diverter or selector valves) allow operators to direct flow between two different circuits or functions. These valves are particularly useful in mobile hydraulics where multiple functions must share a single pump.

Typical applications:

• Switching between different functions
• Directing flow to auxiliary circuits
• Enabling multi-function operation from a single power source

Choosing the Right Valves for Your Application

Selecting appropriate hydraulic valves requires consideration of several factors:

• Operating pressure: Ensure valves are rated for your system’s maximum working pressure
• Flow capacity: Valves must handle your system’s flow rate without excessive pressure drop
• Port size: Correct port sizing prevents restriction and ensures efficient operation
• Operating environment: Consider temperature extremes, contamination and vibration
• Application requirements: Match valve type to specific functional needs

Quality Matters: Why Source from Trusted Suppliers

The quality of your hydraulic valves directly impacts system reliability, safety, if you’re experiencing unexpected failures, and operational costs if frequent issues lead to system downtime.

At BSP Hydraulics, we supply valves from leading manufacturers including Parker, ensuring you receive components engineered to our highstandards. Our team can help you select the right valves for your specific application, whether you’re maintaining existing equipment or designing a new hydraulic system.

Maintenance and Troubleshooting

Regular maintenance of hydraulic valves extends their service life and prevents unexpected failures. Key maintenance practices include:

• Regular inspection for leaks
• Monitoring for unusual noise or vibration
• Checking response times and operation smoothness
• Ensuring correct pressure settings on adjustable valves
• Maintaining clean hydraulic fluid to prevent contamination damage

If you experience issues such as slow operation, erratic movement, or pressure problems, faulty valves are often the culprit. Our hydraulic valve repair service can find and solve valve problems, often providing a cost-effective alternative to replacement.

Get Expert Advice on Hydraulic Valves

Whether you need directional control valves for a new installation or auxiliary valves to enhance your existing system’s performance and safety, BSP Hydraulics has the expertise and product range to support your requirements.

Our team serves customers across Yorkshire and throughout the UK, providing not just quality components but also the technical knowledge to ensure you select the right solution for your application.

Contact BSP Hydraulics today on 01924 332491 or fill in a contact form to learn more.