What exactly are flat valve, cartridge valve and superposition valve? How do they define the difference? What's the use?

Plate valve is grandpa, superposition valve is dad, and cartridge valve is grandson. If you look at the course of history, you can think so. Plate valve appeared the earliest, and the oil circuit design was the most direct. You can recall that when you were a child, it rained or played with sand at the seaside, and built various "dams" on the ground to control the direction of water flow. The same is true of flat valve. Make a plate and make all kinds of passages in the plate. The channel has an opening to the outside of the plate. The plate valve is installed on the plate and used to control the on-off and flow direction of the liquid in the channel in the plate. Very intuitive design ideas. In addition, the electrical automation control at that time had not been developed, and various control logics still needed to make a fuss about the oil circuit of the design board. Execution sequence of hydraulic actuators (hydraulic cylinders, etc.). ) is realized by oil circuit logic.

The superposition valve is the development of electrical automation, and it is not necessary to process all kinds of complicated logic control oil circuits in the board. It can be realized entirely by the logic of electrical control. In the process of using flat valve, it is too troublesome to process flat plates with various flow channels (now called valve bodies), but in most hydraulic control, there are only two actuators (cylinders and motors), namely pressure, flow and direction. Most oil circuit designs are the same. As a result, valves with standard oil circuits appeared, which can be assembled together by superposition. So there is the integrated thing of superposition valve. Of course, due to the unified design of the oil circuit, its oil circuit is simple and single. It is mainly used in places with relatively fixed environment, such as factories.

Cartridge valve, I don't think this thing is commonly used by hydraulic workers. This is mainly used in occasions with large flow, high pressure and harsh use environment, such as large construction machinery and large construction machinery in open-pit coal mines. This is actually a variant of the flat valve. The installation of flat valve is changed to thread design, and the internal design of valve body is simple, and all oil circuits are in the valve body, which is convenient for realizing series and parallel connection of various oil circuits. This design can make maximum use of the energy of hydraulic oil, such as reusing the return oil of rodless cylinder to other cylinders, which saves energy. For the construction machinery that uses diesel engine power outdoors, it certainly improves the energy utilization rate, thus saving energy.

The above are the use history and occasions of these three valves. Of course, the superposition valve is the favorite. You can buy ready-made goods directly and deliver them to your door with a phone call. They are all assembled and used by electricity, which is more worry-free.

As for the flat valve, hehe, of course, if you want to have a little technical content and let others see that you have two skills, it will take several days to learn 3D design software, which is much taller. As for the difference between flat valve and superposition valve in use, I personally think that flat valve seems to be omnipotent, and it must have dug a lot of holes and considered various factors. Finally, the oil leaked, the wires slipped, and all kinds of inexplicable problems appeared, and the head became bigger. Of course, with the digging of various holes in the valve block, there are more brain holes.