Sans inscription -20%
Sans inscription -20%
OUR SERVICES
14 days to
14 days to
to change your mind
Special awards for
Special awards for
professionals
D-day dispatch (24/48H)
D-day dispatch (24/48H)
if I order before 12 noon
A large and comprehensive stock
A large and comprehensive stock
more than 25,000 references

How do I adjust a hydraulic spool valve?

Hydraulic spool valves

Do you have a hydraulic spool valve and are you looking for a solution to adjust it? There are a number of precise steps to follow if you want to adjust it efficiently and optimally. So how do you adjust a hydraulic spool valve? How do you go about it, and what equipment should you use? In this article, we answer all these questions and explain how to adjust a hydraulic distributor correctly.

What is a hydraulic distributor?

Before we go through the various steps involved in adjusting a hydraulic spool valve, let's take a brief look at the purpose of such a system.

Hydraulic systems use a non-compressible liquid such as oil to perform their various functions. In a hydraulic circuit, the directional control valve is one of the key elements. Within the circuit, it is the pump that allows the oil stored in the reservoir to be set in motion. It then passes through the hydraulic distributor, which directs it to the consumers.

Today, hydraulics is a technology used in several fields: in industry (on certain tools), in agriculture (on tractors in particular) and in public works (on certain machinery).

There are several types of hydraulic distributor. Most of the time, the body of the hydraulic distributor is fixed. This is made up of a number of orifices, and a movable spool is fitted inside. This can be moved as required. In this way, it is possible to select a position and direct the oil into a specific circuit.

How to adjust a hydraulic spool valve: explanations

At one time or another, you may need to adjust your hydraulic distributor. To do this, you need to adjust the speed of the actuators. This will affect the flow rate. Another point to bear in mind is that you need to know the precision you want and determine the various parameters that could interfere with the adjustment.

A flow restrictor can be used to adjust a hydraulic directional control valve. This flow restriction can be positioned in bypass, exhaust or inlet.

Here is some information on how to adjust the secondary pressure relief valve:

- Loosen the main and secondary pressure relief valves;

- Activate the pump to start it up;

- Engage the spool valve so that the cylinder rod extends;

- Tighten the main pressure relief valve while monitoring the pressure build-up in the circuit via the pressure gauge;

- Stop adjustment and wait until the stop is reached if you notice that the cylinder is moving;

- Finish adjusting when the cylinder has reached the end stop (200 bar should be seen on the pressure gauge at the pump outlet);

- Engage the spool valve so that the cylinder rod retracts;

- Tighten the secondary pressure relief valve, making sure that the circuit is building up pressure (as indicated by the pressure gauge);

- Stop the adjustment and wait until the stop is reached if you notice that the cylinder is moving;

- End the adjustment when the cylinder has reached its stop (120 bar should be seen on the pressure gauge at the pump outlet).

As you can see, adjusting a hydraulic directional control valve involves following a number of precise steps. These settings must be carried out correctly for your hydraulic control unit to operate optimally and efficiently. A single pressure gauge at the pump outlet is sufficient.

All our tips and news