Selection and installation of YUKEN one-way speed regulating valve

Selection and installation of YUKEN one-way speed regulating valve

When the outlet pressure of the throttle valve increases, the pressure in the U chamber increases, and the pressure reducing valve core moves to the right, causing the pressure reducing throttle port Z to open wider and reducing the pressure loss at the pressure reducing throttle port. Therefore, the inlet pressure of the throttle valve increases until the pressure difference before and after the throttle port y reaches the original set value, and the pressure reducing valve core is in a new equilibrium position, and the flow rate also reaches the original value.

General speed control valves do not have temperature compensation and can be used on machine tools, power head slides, and similar equipment; Another type of valve with temperature compensation device is to replace the rotating valve core with a thin blade slide valve core to reduce the influence of temperature on flow rate. Because the shorter the throttling gap of the throttle valve, the less temperature affects the flow rate, making it a flow control valve that is less affected by temperature. Alternatively, a temperature sensing rod made of a material with high thermal sensitivity can be added between the adjusting screw and the valve core. When the temperature changes, the thermal expansion and contraction of the valve core can be used to automatically adjust the throttling area formed between the valve core and the valve body. Speed control valves with temperature compensation are usually used in equipment that requires high speed control performance.

On the contrary, when the outlet pressure of the throttle valve decreases, the pressure in the U-chamber decreases, and the valve core of the pressure reducing valve moves to the left, causing the pressure reducing throttle port to close smaller and increasing the pressure loss. As a result, the inlet pressure of the throttle valve also decreases, and the pressure difference before and after the throttle port y remains at its original value. In short, regardless of how the load changes, the pressure difference before and after the throttle can be kept relatively constant, thus keeping the flow rate constant. Similarly, when the inlet pressure of the speed regulating valve changes, the process will be similar to the above, automatically adjusting the pressure difference between the two ends of the throttle valve to keep it constant. This type of speed regulating valve is called a pressure compensated speed regulating valve, abbreviated as a speed regulating valve.

The throttle valve and knob are connected to achieve flow control by changing the overcurrent area. When rotating clockwise, the throttle port y of the throttle valve gradually increases, and the flow rate through it also increases to control the flow rate. The area of the left U-chamber of the pressure reducing valve in the figure is equal to the sum of the areas of the V-chamber and W-chamber. The U-chamber is connected to the outlet of the throttle port, while the V-chamber and W-chamber are connected to the inlet of the throttle port. Due to the balance between the hydraulic pressure at one end of the U chamber and the spring force, as well as the sum of the hydraulic pressure on the areas of the V and W chambers, a certain pressure difference is maintained at the inlet and outlet of the throttle gap y, which is maintained by the spring force. When the pressure at the inlet or outlet of the oil changes, the pressure difference before and after the throttle valve also changes, and the flow rate will also change accordingly. At this moment, the pressure reducing valve core begins to move due to the unbalanced force at both ends.

Selection and installation of YUKEN one-way speed regulating valve