Triple eccentric hard seal butterfly valve has played a very important role in the petrochemical industry. The triple eccentric hard seal butterfly valve can accurately break off the working condition when the system fails, greatly preventing worse consequences. Secondly, the triple eccentric hard seal butterfly valve is also very easy to operate, and it can also enjoys a strong stability.   The triple eccentric hard seal butterfly valve is designed with the principle of three-dimensional eccentricity, which idealizes the spatial movement trajectory of the sealing surface. And the sealing surfaces are free from friction and interference with each other. Coupled with the proper choice of sealing materials, its sealing performance, corrosion resistance, high temperature resistance and wear resistance of the butterfly valve are firmly guaranteed.   Its main features are as follows.   1、Small opening torque, flexible and convenient, labor-saving and energy-saving. 2、Triple eccentric plate makes the butterfly disc tighter and tighter the more it is closed. Its sealing performance is reliable. 3、Remarkable resistance for high pressure, corrosion and wear; longer service life, etc.

When we mention Cryogenic Valves, usually it refers to service temperature from -46 °C to -196 °C, and extended stem or extended bonnet. Here are the advantages of extended stem or bonnet:  1.The extended stem/bonnet can protect the stuffing box from low temperature and make sure low leakage here. 2.This design can also facilitate rapid replacement of main valve parts, where you don’t need to disassemble the valve body, all you need to do is just removing the cover to replace the parts. What could be the disadvantages of extended stem or bonnet?  First, it requires larger room for installation. Second, the stem or the bonnet will easily get bent or deformed due to moment by the actuator or the inappropriate calculation of its length.  Dervos is a leading industrial valve maker and trader in China, specializing in the production of cryogenic valves. In addition to those in rare conditions, we also produce other industrial pipeline valves, such as trunnion-mounted ball valves, shut-off pig valves and so on. To learn more about our industry-leading products, contact us today.

Time keeps moving forward, and we get the last day of 2020. As you may have seen, there are a lot of red elements in the following pictures. In Chinese culture, red stands for fortune and luck. We at Dervos all dress in red this day, wishing 2021 would be a red new year for us. It happened to be a Friday, and we finished work early in the afternoon and started to clean our respective work areas. It is kind of a traditional activity in China, sweeping out the old things and welcoming the coming year with a new look. Posting window decalsis also an indispensable work. Helena, the girl in the right pic below, was finishing the phrase that pretty much says new year new luck. Another girl was showing her amazing handcraft job. Count down 3, 2, 1. Finally we get through the terrible 2020 and step into a brand new 2021. Human society artificially divides time into days, months and years. That demonstrates our wishes to left the bad in the past and embrace the unknown future by the alternation of the old and the the new. Although 2020 is a bumpy year, Dervos maintains a positive mindset for the following 2021 and wishes our customers, in the new year, endless luck and joys.

Cryogenic valves are intended for very cold applications. The term "cryogenic" refers to temperatures below -50゜C.   Valve materials for cryogenic service are required for good ductility. Sealing parts, gaskets and other fittings should also be adapted to these extremely cold conditions on demand.   Industries associated with liquefied and compressed natural gas, as well as liquid oxygen, nitrogen or helium, rely on these special valves for the frequent, safe and reliable transport of cryogenic liquids and gases.   Special Cleaning Needs & Concerns To Be Stressed   The valve manufacturers are required to remove grease and all organic contaminants from the valve with a special solvent, keeping the valve clean. Ultrasonic cleaning is a common choice.   Some cleaning gases such as oxygen or chlorine require a very high level of cleanliness to ensure that no organic material or fiber breaks remain on the valve after the cleaning. The cleaned and certified valves are placed in double-sealed polyethylene bags to ensure that the valves are stored in a clean environment until they are installed and used.   Operators should perform a thorough inspection when installing cryogenic valves. This is critical to ensure that no lubricants or grease are accidentally introduced into the valve. Some specialty lubricants are available for use in cryogenic environments, and whether or not they are allowed should depend on the specific application requirements.   As mentioned earlier, cryogenic valves must avoid staining with fiber breaks. As a general rule, fibers longer than 1/8 inch are not allowed in the valve. In many cases, fibers or breaks of any length are not allowed in the valve.   Finally, inspectors should regularly check cryogenic valves and oxygen systems to see if there are internal or external leaks. Internal valve leaks can be prevented by installing the valve properly and a reliable seal design. Cryogenic service requires robust and stable seals to ensure long-lasting and reliable operation of the equipment. Here at Dervos, we’re a leading provider for products inindustrial valve, and we’re certified with the CE, ISO, API and other institutions. We strive to offer the best quality products and customer service through our extensive experience. Contact us today for more information.

The biggest valve Dervos has made ever. This is a DN3750 butterfly valve Dervos made forBombay Municipal Corporation in 2017 which is a government project. The project is special and challenging for its operation for such al arge size of DN3750. As its torque is up to 989954N.m,it is better to be automatically actuated instead of manual operation. But as where it was going to serve is outreach of electrical power, manual operation is the only choice we have. After accurate calculation of the torque, finally we came up with a solution that DN3750 would be operated by a combination of total four gearboxes, which reduced the input torqueinto incredible 117N.m. What an amazing job we did! Andfor this valve, many tests had been carried out, including but not limited to below: We had done DP to the seat ring, UT to flanges, disc and stem, and RT to the welding. Besides, we had done strength tests to disc, adhesive tests to the painting, and IP68 Submergence Test by merging the gearboxes into 3-metre deep water by 72hours. And movement tests were also witnessed, it took about 9 hours from fully open to fully close position. Eventually,The completed valve was made out as about 58 tons and 82.4 CBM. Besides the remarkable work we did, we're so proud that its successful put-in-use was even reported by the local newspaper in Mumbai. As you can conclude, Dervos is indeed a professional and reliable valve provider. Contact us today, and get you the quality products and outstanding services Dervos offers.

It was on 11th of December, a rare cloudless afternoon in these consecutive chilly and dreary winterdays. "Now that the weather favored us, it would be a huge waste to stay at the office, wouldn't it?" Eric Wong, DVS owner, suggested. Then, unexpectedly, we stopped typing, packed staff and went on the way to an extra long footpath that nearly cross the entire downtown. You may see from the image, the walkway spirals up into the woods along the steel frame. As we climb higher, it's getting challenging and scary to walk on the floating way, but the beautiful coastline also emerges on the horizon. As we Chinese always say attracting scenery is always higher. But unfortunately we are within a no-fly area, our drone is forbidden to lift off，the laugh on the first photo below turned into scowl off the camera. Quite hilarious! As the sun went down the hill, the 3-hour brisk walk finally came to an end till the dawn. The glistening sweaton our brow recorded this an joyful afternoon. Though we didn't finish the whole footpath (because it's way too long), we may regard this end as being archived, and some day in the future, perhaps we will have another chance to continue this unfinished trip. 2020 is also approaching an end. Don't forget to say goodbye to this unforgettable year and say hello to the coming unknown 2021. And, definitely, Dervos will be there for you.