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Reversing valve classification
2024-01-16 10:14
According to the relative movement of the spool and the valve body of the directional control valve has two kinds of rotary valve and slide valve.
According to the spool in the valve body to stay in the number of working position is divided into two, three and so on.
According to the number of oil circuits connected to the valve body, there are two-way, three-way, four-way and six-way.
According to the operation of the valve core movement of manual, motorized, electric, hydraulic, electro-hydraulic and other types.
Slide valve hydraulic clamping phenomenon not only in the valve, other hydraulic valves are also widespread, in the high pressure system is more prominent, especially the spool valve residence time is longer, the greater the hydraulic clamping force, resulting in moving the slide valve thrust (such as electromagnet thrust) can not overcome the clamping resistance, so that the slide valve can not be reset.
The causes of hydraulic clamping are: some are difficult to move the spool due to dirt entering the gap, and some are stuck due to the expansion of the spool when the oil temperature rises due to the gap being too small. However, the main reason is the radial unbalanced hydraulic pressure caused by the geometric shape error and concentricity change of the spool valve pair. In order to reduce the radial imbalance force, should strictly control the spool and valve hole manufacturing accuracy, in the assembly, as far as possible to make it into a conical type, on the other hand in the spool open ring pressure groove, also can greatly reduce the radial imbalance force.
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