The bellow globe valve is particularly outstanding in terms of quality and life. It has a double seal to ensure zero leakage, and it is a safe and reliable standard for zero leakage of helium mass spectrometry. The number of bellows cycles can reach more than 10,000 cycles without damage, far exceeding the switch life of the ordinary shut-off valve packing seal several times. In addition, the bellows valve can prevent external dust from the valve body, ensuring the cleanliness of the medium. For example, under the conditions of high-purity silicon powder, pure oxygen, food, vacuum, etc., the performance of the bellows shut-off valve is very outstanding.   Ordinary shut-off valve packing and valve stems will have dynamic friction during the switching process, and the filler will be worn out and fail. Especially in the case of high temperature and low temperature, the filler will expand and contract as temperature changes. In summary, the advantages of bellows globe valves compared to conventional globe valves can be summarized as follows: 1. The bellows globe valve can meet the zero leakage standard of helium mass spectrometry detection, which is very safe and reliable. 2. The service life of the bellows cut-off valve is much higher than that of the ordinary globe valve. The packing of the ordinary globe valve is easy to be damaged and the replacement frequency is high. 3. Bellows Valve’s stem seal has a metal barrier that can be used in high-demand conditions such as oxygen, which requires absolute isolation inside and outside the valve. 4. The bellows valve has a double seal. When the bellows is intact, the filler is completely isolated from the medium, which protects the filler well and greatly prolongs the service life. Xiamen Dervos is an API Certified globe valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to Knife gate valve, we also produce other industrial pipeline valves, such as ball valves, check valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.

Q: Hi. I saw the butterfly valves in your website. Some of them is equipped with a handle,some a gearbox, and they all look to be about the same size. Are the two types of operation equivalent? When You Should Apply Gearbox To Butterfly Valve? A:Gearbox butterfly valves and handle butterfly valves are both butterfly valves that require manual operation, so both of them can also be referred to as manual butterfly valves. For small butterfly valves, the two types of operation can be common. The difference lies in the large-diameter butterfly valves. Specifically,manual operation is suitable for butterfly valves with a calibre ≤ DN200; And butterfly valves within DN200 can also be operated with agearbox. For butterfly valves of DN200 ormore,Gearbox operation is generally recommended. The reason is that as the calibre of the butterfly valve increases,  so does the torque. When the calibre exceeds DN200, it will be very hard to operate with the handle, and the larger the calibre, the harder it will be to operated by a handle. Therefore, if the caliber is DN200 or more, it is better to use a gearbox. When Dervos chellenged to manufacture a butterfly valve of DN3750, we used 4 gearbox to drive the gaint guy. For more details welcome to click the picture to read the story. Dervos is a leading valve manufacturer and provider of engineered products for different industries in China. If you’re looking for professional feasible solutions, check out our vast range of high-quality valves which covers gate valves, ball valves, butterfly valves, as well as other control valves and more. For more information regarding our high-quality products, contact us today!

I believe that those of you who have dealt with valves are not unfamiliar with the names of these butterfly valves. However, Dervos found that there are still many friends who can't tell the differences between a concentric butterfly valve and aWafer butterfly valve, and some may even think that they are different names fora same valve. But it's not. This article will introduce you to the difference between a concentric butterfly valve and aWafer butterfly valve.   Concentric butterfly valve isnamed after the structural form of the valve. In addition to concentric butterfly valve, there are also single eccentric butterfly valve, double eccentric butterfly valve, triple eccentric butterfly valve several.They are named conforming tothe position of the centre of the butterfly plate in the valve body.In terms of structure,the concentric butterfly valve is characterized by the stem axis, the butterfly plate centre and the body centre being in the same position.   The concentric butterfly valve has a simple structure, and usually soft-seated. Rubber or PTFE or other resilient materials are most common;The concentric butterfly valve has very good sealing performance, and can achieve zero leakage. But limited by the sealing material itself, the concentric butterfly valve can only beapplied to normal temperature and low pressure environment. Its not recommended to use them in high temperature and high pressure.   Wafer butterfly valve is named according to the butterfly valve's connection method. In addition toWafer, there are also flange connections,clamp connection,socket-ed,welded and so on. Wafer butterfly valves can be soft-sealed ormetallic-sealed; they can be ofconcentric or eccentric.A concentric butterfly valves may be either clamped or flanged. Aconcentric butterfly valve may be aWafer connection, and aWafer butterfly valve may also be ofconcentric construction.   Therefore, the concentric and Wafer are two different butterfly valve classifications, the two are actually not comparable. Choose the correct butterfly valve according to the different working conditions, and that’s all.   Dervos is a leading valve manufacturer and provider of engineered products for different industries in China. If you’re looking for professional feasible solutions, check out our vast range of high-quality valves which covers gate valves, ball valves, butterfly valves, as well as other control valves and more.   For more information regarding our high-quality products, contact us today!