The speed control valve is a hydraulic control element, which plays a vital role in the hydraulic system, especially in the case of the need to precisely control the speed of the movement of the actuator. The unique feature of the governor valve is its ability to keep the speed of movement of the actuator stable, regardless of changes in the system load. This article will explain in detail how the speed control valve achieves this function.
First, the working principle of the speed control valve.
The speed control valve is a combination of a throttle valve and a pressure reducing valve. A throttle valve is a type of hydraulic valve that regulates the flow rate by changing the area of the throttle, while a pressure reducing valve is a type of hydraulic valve that is able to reduce the pressure of the oil to a predetermined value. In the speed control valve, the throttle valve and the pressure reducing valve are connected in series to form a whole.
When the oil in the hydraulic system flows through the speed control valve, it first passes through the pressure reducing valve and then through the throttle valve. The pressure reducing valve reduces the pressure of the oil to a predetermined value, and then the throttle valve throttles the oil according to the set opening area, keeping the flow of the oil constant. Since the opening area of the throttle valve can be adjusted, the flow through the throttle valve can also be adjusted.
Second, the principle of speed control valve.
The steady speed principle of the speed control valve mainly relies on the coordinated work of the pressure reducing valve and the throttle valve inside it. When the load of the system changes, the pressure reducing valve adjusts the pressure difference between the front and rear of the throttle valve to keep the pressure difference constant, so that the flow through the throttle valve remains constant and the movement speed of the actuator is stable.
Specifically, when the system load increases, the motion of the actuator slows down. At this time, the pressure in front of the throttle decreases and the pressure behind the throttle increases. When the pressure reducing valve senses the pressure change, it reduces the pressure difference between the front and back of the throttle valve, so that the flow rate of the throttle remains constant, so as to keep the movement speed of the actuator stable.
Conversely, when the load on the system decreases, the speed of motion of the actuator increases. At this time, the pressure in front of the throttle increases and the pressure behind the throttle decreases. When the pressure reducing valve senses the pressure change, it increases the pressure difference between the front and back of the throttle valve, so that the flow rate of the throttle remains constant, so as to keep the movement speed of the actuator stable.
Third, the application of speed control valve.
Because the speed control valve has the advantage of stabilizing the movement speed of the actuator, it is widely used in various occasions that require precise control of the movement speed. For example, in injection molding machines, hydraulic presses, machine tools and other equipment, speed control valves are used to control the movement speed of actuators such as molds and pistons to ensure the stability of production and product quality.
In addition, the speed control valve can be used with other hydraulic components for more complex control functions. For example, the combination of a speed control valve with an electronic control element such as a proportional solenoid or servo motor enables intelligent and remote control of the hydraulic system.
Fourth, the maintenance and maintenance of the speed control valve.
In order to ensure the normal operation and service life of the speed control valve, regular maintenance and maintenance are required. For example, the inside of the speed control valve should be cleaned regularly to prevent impurities and particles in the oil from causing wear and blockage to the valve; Regularly check whether the springs and other wearing parts of the speed control valve are worn or damaged, and replace them in time if necessary; Regularly check whether the cleanliness and viscosity of the oil meet the requirements to ensure the normal operation of the speed control valve.
5. Summary. As an important hydraulic control element, the speed control valve has the important function of stabilizing the movement speed of the actuator. Its working principle is mainly through the synergistic effect of the pressure reducing valve and the throttle valve to keep the pressure difference between the front and rear of the throttle valve constant, so that the flow through the throttle valve is kept constant, and the movement speed of the actuator is stabilized. Due to its high accuracy and high stability, it is widely used in various occasions where precise control of movement speed is required. In order to ensure the normal operation and service life of the speed control valve, regular maintenance and maintenance are required.