In the aseptic production process, the most commonly used stop valve is Sanitary Diaphragm Valve. The reason why aseptic diaphragm valve is used is that it has a simple structure and a low price, which makes it almost have no "competitors" so far. The only one that can compete with diaphragm valve is the so-called bellows stop valve, which is commonly known as bellows valve. This kind of bellows stop valve is too expensive. Although it has better technical advantages than diaphragm valve, it is still difficult to compete with diaphragm valve.
In the aseptic process industry, diaphragm valve has always been known for its simple structure and low price. The advantages of bellows valves are low cost and easy cleaning and disinfection. Compared with diaphragm valves, there are too few varieties and specifications of bellows valves on the market. By comparing diaphragm valves with bellows valves, the advantages and disadvantages of the two valves are more clear at a glance. When it is necessary to use a diaphragm valve in a horizontal pipeline, it must be installed in the horizontal pipeline at the angle specified by the diaphragm valve manufacturer. Otherwise, during the operation of the process equipment, the diaphragm valve will encounter some problems when emptying, and the medium in the valve body cannot be completely discharged. However, different diaphragm valve types, diaphragm valves produced by different manufacturers, and diaphragms with different nominal flow rates have different specifications. The installation inclination angle of the valve is different, which often brings great trouble to the design and manufacture of aseptic process equipment. Aseptic process equipment is composed of many horizontal and vertical pipelines. In the design of pharmaceutical equipment, due to pipeline location and technical reasons, this bellows valve must be installed and used in a specific position. For example, if a diaphragm valve is installed in a vertical pipeline, it must be connected through a 90° elbow in the same horizontal plane. The production cost of the T-type diaphragm valve is very high. Compared with diaphragm valves with different valve body structures and shapes, the bellows valve has more advantages in volume and shape when connected and installed with the pipeline. Due to the different structural types of the two types of stop valves, it is necessary to choose which type of stop valve should be used for each part in the early stage of aseptic process equipment design.
The output equipment in the fields of medicine, food and biotechnology has a large number of valves that need to be sterilized. Large valves are almost useless in such occasions where sterilization is required. Because, in these process equipment, the amount of medium required to be transported is getting smaller and smaller, and for less flow, people almost without exception choose aseptic diaphragm valves.