The principle of the hydraulic balance circuit is to keep a certain back pressure value on the oil return circuit of the hydraulic actuator, so as to balance the gravity load and prevent it from falling due to its own weight.

In addition, the balance circuit also plays the role of speed limiting. The actuators of many machine tools or electromechanical equipment move along the vertical direction. The hydraulic system of these machine tools will always be affected by the large gravity load of the actuators no matter when they are working or stopped.

If there is no corresponding balance measures to balance the gravity load, it will cause the execution device of the machine tool to slide down or the action is out of control during operation, and the consequences will be very serious. There are many forms of balance circuit: balance circuit with one-way sequence valve, balance circuit with hydraulic control one-way valve and balance circuit with remote control balance valve.

Extended information:

Compared with mechanical transmission and electrical transmission, hydraulic transmission has the following advantages:

1. Various components of hydraulic transmission can be arranged conveniently and flexibly according to needs.

2. It has the advantages of light weight, small volume, small inertia and fast reaction speed.

3. It is easy to operate and control, and can realize wide range of stepless speed regulation (speed regulation range up to 2000:1).

4. Overload protection can be realized automatically.

5. Generally, mineral oil is used as the working medium, and the relative moving surface can be self lubricated with long service life.

6. It's easy to move in a straight line.

7. It is very easy to realize the automation of the machine. When the electro-hydraulic joint control is adopted, it can not only realize a higher degree of automatic control process, but also realize remote control.