The valves used in the fluid control system, from the simplest stop valve to the various valves used in the extremely complex automatic control system, have many varieties and specifications.
1. Operation principle of gate valve
A gate valve is a widely used valve. Its closing principle is that the sealing surface of the ram and the sealing surface of the valve seat are highly smooth, flat and consistent, and they fit each other, which can prevent the medium from flowing through, and enhance the sealing effect by relying on the top mold, spring or the mold shape of the ram. It is mainly used to cut off the pipeline.
It has the advantages of small fluid resistance, energy-saving opening and closing, and can be used in the case of two-way flow of the medium. There is no directivity, the sealing surface is not easy to be eroded when fully open, and the structure length is short. It is not only suitable for making small valves, but also suitable for making large valves.
2. Working principle of stop valve
The stop valve is the most widely used. In the process of opening and closing, the friction between sealing surfaces is small and durable. The opening height is not high, the manufacturing is easy, and the maintenance is convenient. It is not only suitable for medium and low pressure, but also high pressure. The closing principle of the valve is to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit and prevent the medium from flowing by relying on the pressure of the valve rod.
The stop valve only allows one-way flow of medium and has directionality during installation. Its structural length is longer than that of the gate valve, and its fluid resistance is large, so its sealing reliability is not strong in long-term operation.
3. Working principle of butterfly valve
The disc of the butterfly valve is a disc, which rotates around an axis in the valve seat. The size of the rotation angle is the opening and closing degree of the valve.
The butterfly valve has the characteristics of light and light, saving materials compared with other valves. The utility model has the advantages of simple structure, quick opening and closing, and can be used for cutting and throttling. The fluid resistance is small, the operation is labor-saving, and can be made into a large caliber.
4. Working principle of ball valve
The working principle of the ball valve is to make the valve unblocked or blocked by rotating the valve. The ball valve switch is light and small, which can be made into a large caliber. Reliable sealing, simple structure and convenient maintenance. Sealing surface and spherical surface are often in closed state, not easy to be eroded by medium, so they are widely used in various industries.
5. Working principle of plug valve
The plug valve relies on the rotation of the plug body around the centerline of the valve body to open and close. Its function is to cut off, divide the field and change the flow direction of the medium. The utility model has the advantages of simple structure, small overall dimension, only 90-degree rotation during operation, and little fluid resistance.
6. Working principle of check valve
The check valve is a valve that automatically opens and closes depending on the force of the fluid itself. Its function is to prevent the backflow of the medium. It can be divided into lifting type and swing type according to its structure.
7. Working principle of pressure reducing valve
The pressure reducing valve is an automatic valve to reduce the medium pressure to a certain value. Generally, the pressure behind the valve is less than 50% of the pressure in front of the valve.
There are many kinds of pressure reducing valves, mainly piston type and spring film type. The piston type pressure reducing valve is a valve to reduce pressure through the action of the piston. Spring film-type pressure relief valve, is to rely on the spring and film to carry out pressure balance.
8. Working principle of drain valve
The function of the drain valve is to automatically discharge the continuous condensate without letting the steam out.
There are many kinds of traps, including float type, float ball type, bell type, pulse type, thermal power type and thermal expansion type.
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