In order to design the most efficient, cost-effective and energy-saving system, it is necessary to understand the available technology in fluid power. Traditional hydraulic equipment design almost exclusively uses directional control valves. These directional valves, sometimes called "switching" valves or "exploding" valves, can be used to control flow direction, flow, and fluid pressure. These valves can be operated by AC or DC power.This articleZhongyou Heavy IndustryProportional valve, direction valve and servo valve to bring these three kinds of hydraulic valve what are the differences.
1. proportional valve:
The technical solution to these more complex circuits is the development of proportional valves. These revolutionary valves allow infinite positioning of the spool, thereby providing infinitely adjustable flow. Stroke control solenoids or force control solenoids can be used to achieve infinite positioning of the spool.
This variable position allows the spool to be designed with metering notches to provide flow/speed control and direction control functions in one valve without the need for separate valves for direction and speed. Another major advantage is that when the circuit requires multiple speeds, by changing the electrical signal level to achieve the required flow/speed, various speeds can be achieved without the need for other hydraulic components! These proportional directional valves are controlled by DC power.
The proportional control and its associated electronic control together also add the ideal function of acceleration and deceleration, which provides a variety of machine cycles, can safely run at higher speeds, and with controlled start and stop characteristics, adjusted acceleration and deceleration can improve the overall cycle time and productivity of the machine.
2. direction control valve:
Directional control valves are often referred to as switching valves because they simply direct or "switch" the fluid passing through the valve from the flow source to the fluid source, selecting one of the cylinder ports, the flow control type of the valve will usually select an orifice that only allows a specified flow through, a specified volume control cylinder or a hydraulic motor speed. Again, the pressure control type is used to select a specific pressure setting.
Using these valves to change direction during machine operation, flow or pressure will require a separate separate valve for each direction, flow or pressure required, and the hydraulic circuit will quickly become very complicated!
Three: servo valve:
The third technology of hydraulic directional control is the servo valve. The servo valve is not a new technology, because the servo valve was first used in the 1940 s. The servo valve has high accuracy, high repeatability, very low hysteresis and high Frequency response, the servo valve is used in combination with more complex electronic equipment and closed-loop systems. As a result, the servo valve is always much more expensive. The proportional control valve system can be used to improve the control of most machines without paying the high price of a servo control system.
Zhongyou Heavy Hydraulic Technology Advantage]
Zhongyou Heavy Industry in strict accordance with the ISO international standard quality management system and 5S management standards for quality control and internal management. The "Henan Province Fluid Pressure Forming Intelligent Equipment Engineering Technology Research Center" has been established. The core team is composed of dozens of doctors, masters and metal forming experts and professors from various colleges and universities, focusing on the research and development of hydraulic forming core technology and product process.
Zhongyou Heavy Industry has carried out long-term production, learning, and research cooperation with the Institute of Metals of the Chinese Academy of Sciences, Nanjing University of Aeronautics and Astronautics, and jointly established a "Hydroforming Technology Industrialization Demonstration Base" to track domestic and foreign technologies and continuously improve "Zhongyou Heavy Industry" hydraulic equipment brand value.