“Competition between bellows and diaphragm valves” has been in the aseptic process industry for a long time. For a long time, diaphragm valves have taken advantage of their simple structure, low price and convenient cleaning and disinfection. Compared to diaphragm valves, bellows valves are too few in the market. Today, the Vesta bellows valve produced by Tuchenhagen fills this gap. This article compares the advantages and disadvantages of the two valves by comparing the diaphragm valve with the bellows valve.
When it is necessary to use a diaphragm valve in a horizontal pipe, it is necessary to ensure that the diaphragm valve is installed in the horizontal pipe according to the angle specified by the manufacturer of the diaphragm valve. Otherwise, in the operation of the process equipment, the emptying of the diaphragm valve may encounter some problems, and the valve may not be completely discharged. The medium in the body. However, the different diaphragm valve types, diaphragm valves produced by different manufacturers, and diaphragm valves of different nominal flow rates have different installation inclination angles, and often cause great troubles for the design and manufacture of aseptic process equipment. This problem of emptying the valve body is more pronounced in the T-shaped diaphragm valve.
Compared with the diaphragm valve, the Vesta bellows valve does not have such a problem. No matter what kind of structure the valve body of the Vesta bellows valve is, there will be no “dead angle” when the process equipment is running at no load, thus ensuring strictness. Ground the pipe. Moreover, it can be installed in the piping system of aseptic process equipment according to different installation methods.
In the pharmaceutical industry, aseptic process equipment consists of many horizontal and vertical pipes. In the design of pharmaceutical equipment, such bellows valves must be installed at specific locations due to pipe location and technical reasons. For example, if a diaphragm valve is installed in a vertical pipe, it must be connected through a 90° elbow in the same horizontal plane. The T-shaped diaphragm valve has a high production cost. Compared with the diaphragm valve with different valve body structure, the bellows valve has advantages in connection with the installation of the pipe in terms of volume and shape. Due to the different structural types of the two types of shut-off valves, in the initial stage of the design of aseptic process equipment, it should be selected which type of shut-off valve should be used in each part.
Output devices in the fields of medicine, food and biotechnology have a large number of valves that require disinfection. Large valves, such as the Stericom series, have little use in this situation where disinfection is required. Because, in these process equipment, the amount of medium required to be transported is becoming less and less, and for less flow, the diaphragm valve is almost invariably selected. The new bellows valve has a smaller volume and can be used with different pipe diameters, which is superior to diaphragm valves in this respect.