Hydraulic Sequencing Valve

Your Ultimate Guide to Understanding Hydraulic Sequencing Valves

If you are wondering how machines and equipment are controlled by hydraulic work, this guide is for you. This comprehensive guide will discuss in-depth information about hydraulic sequencing valves. These valves play a crucial role in ensuring that hydraulic systems will function smoothly and efficiently. We will be discussing what is hydraulic sequencing valve, its purpose, operation, and applications. Whether you are a beginner or want to deepen your knowledge about these valves, scroll down and keep reading!

What is a Hydraulic Sequencing Valve?

These valves are normally a type of closed pressure valve. It will open when the set pressure has been reached.

It also manages the operation sequence of the two circuit branches. Therefore, one branch circuit is capable of automatically activating another branch circuit.

Hydraulic sequence valves and relief valves have similarities with each other. However, the sequence valve is designed with an actuator to divert the media to another system so the next programmed sequence will be executed.

What is a Hydraulic Sequencing Valve
How Does Hydraulic Sequencing Valve Work

How Does Hydraulic Sequencing Valve Work?

The programmed pressure setting in the inlet port should be reached before the hydraulic oil can pass through the outlet port. At the same time, the hydraulic oil can perform all the necessary operations in the hydraulic system.

The valve’s primary spool is spring-loaded. Therefore, ensuring that the sequence valve is closed during low pressure. A small actuator is used to process the control stage in the inlet port. The control spool will open once the applied force from the adjuster spring is reached by the pressure. This process causes the main spool to open. Hence, the flow of media from the inlet to the outlet.

Its Mechanism

Hydraulic sequence valves are classified into two ways.

First, it is classified based on its structure and mechanism. It has two different types including pilot and direct action.

Second, hydraulic sequencing valves are classified based on their pressure control method. It is also categorized into external and internal control.

Its Mechanism

Primary Function of a Hydraulic Sequencing Valve

There are three main functions of a hydraulic sequencing valves including:

  • It ensures that one actuator or cylinder receives fluid flow before another, prioritizing their operation based on specific requirements.
  • The valve can be used to control the sequence of multiple actuators, allowing them to move in a specific order to perform a series of tasks or operations.
  • It regulates the flow of hydraulic fluid to the actuators to prevent overloading or ensure a smooth and controlled motion.

Hydraulic Sequencing Valves for Different Industries

Automotive. They play a role in automotive assembly lines to control the sequence of hydraulic operations in various manufacturing processes, such as welding and pressing.

Aerospace Industry. They are used in hydraulic systems of aircraft and spacecraft for applications like controlling the sequence of landing gear deployment.

Construction. Applications include backhoes, excavators, and loaders to control the sequence of movements.


In conclusion, understanding hydraulic sequencing valves is key to making hydraulic systems work. By learning the basics, you’ll be better equipped to appreciate their importance in various applications.

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