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Main performance of reversing valve

Main performance of reversing valve

 

The project of solenoid valve is the most, it mainly includes the following items:

1. working reliability

It refers to whether the electromagnet can be reliably reversed after electrification, and whether it can be reliably reset after power failure. The solenoid valve can work normally only in a certain range of flow and pressure. The limit of this range of work is called the commutation limit.

2. pressure loss

Because the opening of solenoid valve is very small, the liquid flow through the valve mouth produces greater pressure loss.

3. internal leakage

At different working positions and under specified working pressure, the leakage from high pressure chamber to low pressure chamber is the internal leakage. Excessive internal leakage will not only reduce the efficiency of the system, cause overheating, but also affect the normal operation of the executing agencies.

4. Commutation and reset time

The commutation time of AC solenoid valve is generally 0.03-0.05 s, and the commutation impact is larger, while that of DC solenoid valve is 0.1-0.3 s, and the commutation impact is smaller. Usually the reset time is slightly longer than the commutation time.

5. commutation frequency

The commutation frequency is the number of commutations allowed by the valve per unit time. At present, the commutation frequency of solenoid valve with single solenoid is generally 60 times per minute.

6. service life

The service life of solenoid valve mainly depends on the electromagnet. The life of wet electromagnet is longer than that of dry electromagnet, and that of DC electromagnet is longer than that of AC electromagnet.

7. Hydraulic clamping of slide valves

The hydraulic clamping phenomenon of sliding valves not only exists in reversing valves, but also in other hydraulic valves, which is more prominent in high-pressure systems. Especially, the longer the stay time of sliding valves, the greater the hydraulic clamping force, so that the thrust force of moving sliding valves (such as electromagnet thrust) can not overcome the clamping resistance and make the sliding valves unable to reset.

The reason of hydraulic clamping is that some dirt enters into the gap and makes the valve core difficult to move. Others are because the gap is too small and the valve core expands when the oil temperature rises, but the main reason is the radial unbalanced hydraulic pressure caused by the geometrical error of the slide valve pair and the change of the concentricity. In order to reduce the radial unbalanced force, the manufacturing accuracy of the valve core and the valve hole should be strictly controlled. When assembling, the valve core should be in the form of a cone as far as possible. On the other hand, the radial unbalanced force can be greatly reduced by opening a pressure equalizing groove on the valve core.