In the hydraulic cylinder, whether the control valve is reasonable will have a great impact. And in the choice of control valve, mainly from two aspects to consider, the first is the proportional direction of the valve selection, the other is the import pressure compensator selection. Let's take a look at the details.

Normally, we can according to need will be combined with different valve parts, such as the throttle control of hydraulic cylinder can be type proportional direction valve and differential pressure reducing valve, forming type differential pressure compensation proportion direction flow valve, the discharge valve controlled flow mainly depends on the input signal, and not affected by oil pressure and load change. Normally, the differential pressure of the constant differential relief valve is 1.OMPa.

After the differential pressure is determined, the flow rate of the proportional direction valve of the hydraulic cylinder can be determined as follows: the input signal corresponding to the maximum flow rate of the actual proportional direction valve should be close to 90% of the rated input signal, and the input signal corresponding to the minimum flow rate of the actual proportional direction valve should be greater than the dead zone of the proportional direction valve. This can not only improve the resolution of the flow, but also avoid the emergence of crawling problems.

So, in the choice of imported pressure compensator, what should be considered? At present, the hydraulic cylinder of the import pressure compensator in most cases are the use of two and three structure, especially the two is the most common. However, it should be noted that the normal operation of the compensator requires a minimum control pressure difference, the constant difference valve can play a role in reducing pressure.

This effect is lost if the actuator is negatively loaded. In order to prevent such problems, we can use a balance valve with backpressure role, so that the proportional valve valve port pressure difference does not change with the fluctuation of the load.