| Customization: | Available |
|---|---|
| Media: | Oil |
| Temperature: | Ordinary Temperature |
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Function:
The main valve of Rexroth valve 4WRA6V30-23/G24N9K4/V-589 is generally a slide valve structure like the reversing valve, but the reversing of the valve core is not driven by the electromagnet, but by the hydraulic pressure output by the pre-stage valve. This is similar to the electro-hydraulic reversing valve, except that the pre-stage valve of the electro-hydraulic reversing valve is a solenoid reversing valve, while the pre-stage valve of the servo valve is a nozzle flapper valve or jet tube valve with better dynamic characteristics.
In other words, the main valve of the servo valve is controlled by the output pressure of the pre-stage valve, and the pressure of the pre-stage valve comes from the inlet p of the servo valve. If the pressure of the p port is insufficient, the pre-stage valve cannot output enough pressure to drive the main valve core to move.
As we know, when the load is zero, if the four-way slide valve is fully open, the pressure at port P = the pressure at port T + the pressure loss at the valve port (ignore other pressure losses in the oil circuit). If the pressure loss at the valve port is very small and the pressure at port T is zero, the pressure at port P is insufficient to supply the pre-stage valve to push the main valve core, and the entire servo valve fails. Therefore, the valve port of the servo valve is made too small, and even when the valve port is fully open, there must be a certain pressure loss to maintain the normal operation of the pre-stage valve.
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