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  • Advantages of V-port Valves
    Advantages of V-port Valves Sep 18, 2020
    The V-ball valves or V-port ball valves are similar to traditional ball in which there is a V-notch on a ball-shaped disc to control flow by a rotating quarter-turn motion. The “V-port" is a particular design that bring about precise flow and the ability to regulate and control flow by V balls of  different degrees. These special valves are used in a wide range of chemical applications, including the most challenging services with many advantages.   Flow Modulating The accuracy of V-ball valves provides equal percentage flow characteristics. As the ball rotates, desired flow rates can be achieved by positioning the ball anywhere between 0° and 90°.   Bubble tight shutoff V-ball valves have the ability to close tightly. Therefore, no other shutoff valves is required when using a V-ball valve on a globe valve.   Lower pressure drop V-ball valves also have a higher coefficient of flow (Cv) than the same size globe valve, which directs the flow and uses a plug to control the flow through the valve. This means that the flow rate achieved by one shut-off valve can be achieved with a smaller V-ball size.   Higher shutoff pressure. A 90°rotation of the ball allows the V-ball to close at a higher operating pressure. This therefore allows the use of lower torque actuators, resulting in cost savings and increased efficiency for the end user.
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  • Know and Know More About Changeover Valve
    Know and Know More About Changeover Valve Sep 11, 2020
    There are quite a few types of changeover valves, and according to different standards, there are different subdivisions. But in general, it is mainly four kinds, for motorized changeover valve, manual changeover valve, solenoid valve and electro-hydraulic changeover valve.   1. What is a changeover valve?   Changeover valve, from a professional point of view, is a kind of direction-change valve. It is mainly used to achieve the flow of hydraulic oil, cut off the machine changeover operations, pressure relieving, as well as sequential action control, so its use is very wide.   2. The working principle of reversing valve   The changeover valve uses a  driving mechanism outside the valve to rotate the drive shaft, and then activates the valve plate, etc. So that the fluid can flow into the outlet of the lower part of the valve, and can be changed from time to time to achieve the purpose of periodically changing the flow direction.   3. Changeover valve classification  (1) Motorized changeover valve, it is also known as a stroke valve.    (2) Electromagnetic changeover valve, electromagnetic changeover valve is the use of electromagnetic attraction to manipulate the spool changeover control valve.    (3) Electro-hydraulic changeover valve, electro-hydraulic changeover valve is a composite valve composed of solenoid valve and hydraulic changeover valve.    (4) Manual changeover valve, manual changeover valve is a changeover control valve with a manual lever to manipulate the spool shift direction-changing valve.  
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  • How to extend the service life of lined valves?
    How to extend the service life of lined valves? Sep 01, 2020
    Among the anti-corrosion materials, PTFE has incomparable excellent performance. In addition to outstanding chemical stability, it also has satisfactory anti-fouling and anti-stickiness, small dynamic and static friction coefficient, good anti-wear performance. Using it as a valve opening and closing the sealing material, the friction between the sealing surface and required operating torque will be reduced, hence product life increases. the application scope can also be extended to the food, pharmaceutical industry and so on. Fluorine lined valves, also known as anti-corrosion valves, are usually found in harsh working conditions. The media is either toxic and harmful chemicals, or pretty corrosive acids and bases or organic solvents. That means improper use and operation will elicit significant economic losses and serious consequences. Applicable media: various concentrations of acid and alkali salt and certain organic solvents. Fluorine is extolled as the world's most ideal anti-corrosion materials, has been widely used in the rotational molding of large equipment and piping lining. Correct use and maintenance of the valve can extend the service life of fluorine lined valves, then what can be done to effectively protect it? 1. Carefully read the instruction manual before use. 2. Use it within the range of pressure, temperature and media given by the nameplate or instruction. 3. To prevent fluorine lined valves from excessive piping stresses due to temperature changes, temperature changes should be minimized and U-shaped expansion joints should be added before and after the valve. 4. For some unstable and easily decomposed media (such media will expand after decomposition,  resulting in an abnormal pressure rise) and media that can cause valve damage or leakage, measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. 5. For fluorine lined valves in pipelines of toxic, flammable, explosive, highly corrosive media, it is strictly prohibited to replace the packing under pressure. Even the valves are designed with sealing part, it is not recommended to replace the packing under pressure either. 6. For pipelines with self-combustible media, measures should be taken to ensure that the ambient and working temperatures do not exceed the self-combustibility point of the media to avoid the danger from sunlight or external fires.
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  • Dervos obtains 2 new technical patents
    Dervos obtains 2 new technical patents Aug 24, 2020
    Dervos recently attained two new kinds of technical patent that refer to a kind of gate valve and a kind of globe valve with filtration ability. Most of the gate valves open and close by turning the handwheel connected to the stem, which causes the stem to move up and down in the guide groove and press the valve plate to the seat. However, the stem and the valve body press each other firmly, and if the gate valve is not used for a long time, it will take huge efforts to turn the wheel to open and close the valve, which impedes the valve use. Dervos new patent helps to alleviate the difficulty by inserting the valve plate into the groove of the valve body, the lifting assembly can quickly raise the valve plate so that the inlet and outlet can be connected and open the gate valve. On the other hand, the assembly can lower the valve plate to the lower surface of the valve plate and contact the bottom of the groove of the valve plate, so that the inlet and outlet cannot be connected and the gate valve can be closed. As for the globe valve, it is known as one of the most widely used valves to stop the flow of medium in a pipeline. The current piping system often fails to work properly due to impurities in the fluid in the pipeline, so it is necessary to add filtration function to the globe valve. By optimizing the internal structure, Dervos has innovatively installed strainers and other fittings inside the valve body, so that the globe valve has these advantages: 1. No need to cut off the medium when cleaning the strainer. 2. Easy replacement of filters. 3. Outstanding sealing performance. Dervos has been committed to bringing quality products to the market, and we also keep gonging on a creative development path.
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  • Next Station, Chengdu !
    Next Station, Chengdu ! Aug 20, 2020
    After thousand times of discussion and debate, Chengdu--a charming and vigorous city in southwest China, and several spectacular natural sites around the city are decided to be the destination of this year’s company trip. For the first time on this year's trip, we split into two teams. One team fly to the city and go to a nationally renowned tourist attraction namedJiuzhai Vally,and the other who have visited the city before choose to take a road trip to Chengdu. After 4days, the two Dervos squads will meet in the beautiful city. Where the Sightseeing-team goes to is a national park that’s best known for its fabled blue and green lakes, spectacular waterfalls, narrow conic karst land forms and its unique wildlife. Jiuzhai vally is almost the synonym of fairyland. Though it was rainy, the rain and stray cloud also added special emotions to the picturesque place. Literally, we took hundreds and thousands of pictures there. We wanted to catch the fascinating scene and catch the moment we spend together. Then Let’s talk another team-- the self-driving team. In 4 days, they made their way north, crossed 5 province, visited cities and ancient towns, tasted local dishes and they even drove to a mountain at an elevation of 4,000 meters. You have to say that, they are the real players and played more than hard. Two teams, in the end, met in Chengdu. We have one kind of national-wide popular food in China called ‘hotpot’ which actually is born in Chengdu. Of course we didn’t miss it. What’s more, Chengdu is home to anther thing you definitely heard before or even love-- panda. We also visited these adorable creatures. We say that 2020 is quite a difficult year. It’s like on a hard mode. But we believe that it will get better. The road lays there, it always waits for someone to step onto it. We, Dervos people, have been on the road, and will never stop.
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  • What 3 parts of Triple offset butterfly valve are offset?
    What 3 parts of Triple offset butterfly valve are offset? Aug 07, 2020
    The sealing performance of traditional hard seal butterfly valve is not so satisfying, because the leakage of the valve is hard to avoid. In order to change this situation, after several upgrades of hard seal butterfly valve, the triple eccentric butterfly valve arrives.   The characteristic of the triple eccentric butterfly valve is that the high-temperature and corrosion resistant alloy material is welded to the seat sealing surface layer, and the multi-layer soft stacked seal ring is fixed on the butterfly plate. Such a process makes the triple eccentric butterfly valve more resistant to high temperature and high pressure environment and more corrosion-resistant than the traditional butterfly valve products.   To be specific,  the benefits of the triple eccentric structure of the hard seal butterfly valve are--   The design of the triple eccentric type is so unique that the metal hard seal begins to save more effort. When the valve is open or closed, there is no friction between the butterfly plate and the valve body while rotating. When the valve is closed, the increasing torque of the transmission mechanism can provide a compensating seal, greatly improving the sealing performance of the triple eccentric butterfly valve. At the same time, the service life of the butterfly valve increases.   What 3 parts of Triple offset butterfly valve are offset?   The first eccentric part is that the spindle which is located behind the spindle of the valve plate, allowing the seal to completely and tightly surround the entire valve seat.   The second eccentric part is that the centerline of the valve shaft deviates from the centerline of the pipe and the valve. This construct prevents interference from valve opening and closing.   The third eccentric is that the valve seat cone axis deviates from the center line of the valve shaft, so as to eliminate friction in the closing and opening process, and to achieve a uniform and consistent compression seal around the entire valve seat.   The above is an introduction to the three eccentric butterfly valve, three eccentric butterfly valve is a high-performance butterfly valve, currently used in many fields. And even in some areas, triple offset butterfly valve has took the place of the gate valve, globe valve, ball valve and other products.  
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