What is the difference between diaphragm valve and

2022-08-06
  • Detail

What is the difference between diaphragm valve and bellows valve in sterile process equipment

ptfe corrugated string 7-tube

the "competition between bellows valve and diaphragm valve" in the field of aseptic process industry has a long history. For a long time, diaphragm valve has occupied the advantage of simple structure, low price and convenient cleaning and disinfection. Compared with diaphragm valves, bellows valves have too few varieties and specifications in the market. Today, the Vesta bellows valve produced by tuchenhagen fills this gap. Through the comparison of diaphragm valve and bellows valve, the advantages and disadvantages of the two valves are more clear at a glance

emptying performance

when the diaphragm valve needs to be used in the horizontal pipeline, it must be ensured that the diaphragm valve is installed in the horizontal pipeline according to the angle specified by the diaphragm valve manufacturer. Otherwise, during the operation of the process equipment, the emptying of the diaphragm valve will encounter some problems, and the medium in the valve body cannot be completely discharged. However, different types of diaphragm valves, diaphragm valves produced by different manufacturers, and diaphragm valves with different nominal flow have different installation inclination angles, which often brings great trouble to the design and manufacture of sterile process equipment. In the diaphragm valve with T-shaped structure, the problem of emptying the valve body is more obvious

compared with diaphragm valve, vest building lighting design standard gb/t 50033 (2) 001a bellows valve will not have such a problem. No matter what structural form the valve body of Vesta bellows valve is, there will be no "dead corner" when the process equipment is under no-load operation, so as to ensure that the pipeline is tightly isolated. Moreover, it can be installed in the piping system of sterile process equipment according to different installation methods

in the pharmaceutical manufacturing industry, 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 at a specific location. 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 production cost of diaphragm valve with T-type structure is very high. Compared with diaphragm valves with different valve body structure shapes, bellows valves have more advantages in volume and shape in connection and installation with pipelines. Due to the different structural types of the two types of stop valves, at the early stage of aseptic process equipment design, it is necessary to select which type of stop valve should be selected for each part

the output equipment in the fields of medicine, food and biotechnology has a large number of valves that need to be disinfected. Large valves, such as the stericom series, have little use in such occasions where disinfection is required. Because in these process equipment, the amount of medium required to be transmitted is less and less according to the Korean media. For less flow, people almost invariably choose diaphragm valves. The new bellows valve has a smaller volume and can be used with different pipe diameters. It has more advantages than the diaphragm valve in this regard

comparison of equipment utilization ratio

as a user of equipment, use equipment for production as much as possible within the service life of the equipment, that is, the utilization ratio of equipment should be as high as possible. Equipment maintenance means that the production of the equipment must be stopped and a certain amount of equipment maintenance costs must be invested. Bellows valves are generally worn; In the diaphragm valve, once the valve is worn, the diaphragm must be replaced after a certain service time. The service life of the diaphragm depends on the corresponding production process. On the one hand, working parameters such as corrosion of circulating medium in process equipment, temperature during pipeline cleaning and disinfection, working pressure and flow of process equipment will affect the service life of diaphragm; On the other hand, the deformation of diaphragm during opening and closing of diaphragm stop valve is also an important factor to determine the service life of diaphragm

bellows stop valve with pneumatic drive

most diaphragm valves are damaged not because of their use in the production process, but because of mechanical extrusion. Although the diaphragms of diaphragm valves have different elastic grades, different coatings and different PTFE guard plates, all diaphragm valves have invisible wear from the outside (surface corrosion and particle adhesion caused by internal media). Therefore, in order to avoid the forced shutdown of aseptic process production due to the damage of diaphragm valve, in practice, the diaphragm is usually replaced before the specified service life. In this way, the number of forced replacement diaphragms, the resulting maintenance costs, or the downtime of the equipment are significantly more than those of PTFE bellows valves. Another advantage of bellows valves is that they can be used in almost all production processes

core component

the key component of Vesta bellows valve is the stop bellows made of tfm1705ptfe. In addition to resisting the corrosion of various chemical media, tfm1705 material also meets the requirements of "perfluorocarbon resin" in § 177.1550, Article 21 of the federal regulations of FDA. Its smooth surface (RA ≤ 0.8mm), reliable sealing, large switching distance and other characteristics are very beneficial to the best cip/sip disinfection and cleaning. Over the past three years, this patented bellows valve has successfully gained a foothold in the market, and can strictly isolate the atmospheric environment inside and outside the pipeline in the sterile process pipeline

Copyright © 2011 JIN SHI