What are the common points of various hydraulic valves in four-column hydraulic press

The four-column hydraulic press is gradually emerging, and the related hydraulic valves also follow its pace. So, do you know what is a four-column hydraulic press hydraulic valve?
Although there are many kinds of hydraulic valves of four-column machines, the functions and structural forms of each valve are also very different, but there are the following basic common points between the two. There are two specific differences:
1, From a structural point of view, the hydraulic valve is composed of the valve body, the spool and the parts that drive the spool movement.
2. On the working principle, the opening size of the hydraulic valve of the hydraulic press, the pressure difference between the inlet and outlet, and the flow relationship through the valve conform to the flow characteristic formula of the hole, but the control parameters of each valve are different.

It can be seen that the hydraulic valves used in the hydraulic system of the four-column hydraulic press should meet the following basic requirements.
1. Easy to operate, reliable to use, small impact and vibration during work.
2, oil flow outdated pressure loss is small.
3, good sealing performance.
4, compact structure, easy installation, adjustment, use, maintenance, versatility.
A good hydraulic valve with a good hydraulic press, just like the tiger added wings, the power is amazing.