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  • Better properties of ball valves over butterfly valves
    Better properties of ball valves over butterfly valves Jul 23, 2020
    Ball valves and butterfly valves are the two most common types of rotary valves. It only need a quarter-turn to turn on or turn off both valves. However, there are certain functions where a ball valve is better than a butterfly valve.   First of all, ball valve provides a perfect seal. When the valve is completely closed, there will be no leakage. More importantly, the ball valve can rotate regardless of the pressure from the supply line. What’s more, as long as it is fully open, it will not reduce the pressure of the fluid in the pipeline.   Ball valves are primarily used to control high-pressure liquid and gas lines. This is because ball valves do not cause any pressure drop or impede fluid movement when fully open. What is worthy to be noted that they are primarily used in applications where the inside diameter of the pipe is less than or equal to 6 inches.   Ball valves have no trouble in high-pressure applications. In addition, when ball valves are used in high-pressure applications, a pressure balancing scheme is not required. This is not possible with butterfly valves.   Ball valves have a simple structure. They are also smaller and lighter compared to many other types of valves. Ball valves have a very flexible soft seal, which makes it easy to operate. And ball valves have the lowest fluid resistance compared to all other types of valves.   You can use the valve for many years without any damage due to leakage. In other words, this means that the valve is reliable and cost effective in the long term. This valve can be designed to withstand extremely high pressures. In fact, you will recognize that high-pressure systems often have ball valves fitted internally.   There can be multiple ends in a ball valve. It allows many combinations of ports. If you are thinking of purchasing a ball valve, you can consider these advantages before your purchase.
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  • 12 Dervos people get QMS internal control licenses
    12 Dervos people get QMS internal control licenses Jul 10, 2020
    Dervos held a training course on the quality management system of the ISO 9001:2015. The three-day training was conducted by the leading auditors of Lloyd’s Register, a world-renowned certification authority. Here comes the terrific news that 12 Dervos people from different sectors passed the examination and obtained the qualification to manage internal control of a company. The course was held from July 7 to 10, The specialists of the audit company introduced the profound system in simple words. She praised the competence of our team and emphasized how important it is for a company to run in line with the international legal and regulatory standard requirements. The well-informed auditor said certification obtained according to the ISO 9001 series of standards is an indicator of stable quality of the Company’s operation. The fresh internal auditors we have now can ensure Dervos’s compliance with the requirements of internal, international and industry standards & regulations, and customer requirements. And they also determine the effectiveness of the implemented system in meeting specified objectives (quality, environmental, financial). With our new internal auditors, Dervos will pay more attention to the effectiveness and efficiency in the routine run of the company, in such way can we grow stronger and provide better services.
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  • 'Happy day' celebrating activity of Dervos 12th birthday
    'Happy day' celebrating activity of Dervos 12th birthday Jun 27, 2020
    June 27th is a big day to Dervos as it marks it has been 12 years since Dervos started to explore the sector of industrial valves. For 12 years, Dervos has been committed to providing the best products and solutions to its customers, and Dervos itself didn't stop learning and growing, eventually, it became what it is today. We at Dervos believe that work hard and play hard. On this special day, Happy day' -- this is how we call it, a whole day of celebration awaits us. At first, we played the surprising video for Eric and Ken, the two founders of this big family, in which we reviewed when we joined Dervos by saying 'Hi, this Dervos of 20XX, how are you?'. From that video, we could learn how Dervos grow from a small company of only two to today's 30-plus. Then the gift-seeking session began. Everyone got a clue like 'the coziest chair in the office', and he or she had to find the sticker hidden in the place and get the gift the sticker shows. For the gifts, it seems everyone was driven crazy and almost turned the office up and down. Finally, of course, no gift eluded.     After a short break, we drove to a game club of trueman room escape--the most popular game in China now. Being divided into 4 teams, we were sent into 4 different themed rooms in which we needed to find the objects to interact with other items in the room to reveal a way to escape in a given time. Guess how many teams were smart enough to pass the game?     The dinner and Karaoke in the evening were also exciting. Everyone, boys and girls, their faces looked so charming and lively in the dim light. Laughter and cheers filled the beautiful night. Everyone enjoyed the wonderful day. This is the beginning of the Devos's 12th year, we will meet in the next 12 years and more.    
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  • Dervos holds 3-day-long marathon mid-year meeting
    Dervos holds 3-day-long marathon mid-year meeting Jun 23, 2020
    In a blink of an eye, half of 2020 has already passed. In order to sum up the experience and better deploy and carry out the work in the second half of this year, Dervos held a mid-year meeting from June 21st to 23rd. This meeting is divided into 10 sessions in 3 days, as each department such as the finance department and human resource department gives an account of their work in first half year. What’s worthy to be noted is that our colleagues on behalf of the branch office in Lishui, Zhejiang province also present in this mid-year meeting. Eric, CEO of Dervos, suggested his three-year work plan, as a general guide for Dervos development path in the next few years. In the meeting, he said Dervos should take advantage of its business department, quality inspection department, integration center as its core competitiveness. Eric also expressed his expectation that all sales to be product savvy, industry savvy, customer savvy, business savvy, and supply chain savvy, and required that from now on, every employee would work and study in the factory for at least one month every a year, to learn more know-how about our products and serve our customers much professionally.    In the final meeting, Dervos revealed it’s new edition of employee handbook, and updated salary structure and improved other company rules and regulations, in an attempt to better arrange company works and help the company itself and all of its team members better grow and develop in the future. Once the meeting ends, it marks Dervos, who is born in 2008 June, officially steps into its 12th. Chinese believes that each 12-year marks a circle or periodic growth, so in the last year of Dervos first big circle, please give us your best support and we also promise that we will continue to serve our customers with high-quality and durable products.
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  • What's a knife gate valve and how it works
    What's a knife gate valve and how it works Jul 12, 2020
    A knife gate valve serves as a ‘ninja’ that wields a blade to cut off blockages of heavy liquids in the pipelines. With the sharp blade, knife gate valves usually present in a situation where there is most corrosive, aggressive and abrasive The pulp and paper industry is the one the knife gate valves were originally designed for. In the past, the viscous pulp will be caught between the wedge and seat of an ordinary gate valve, thus the flow stream can not be shut off. The knife gate valve there, with a sharp cutting edge, is able solve the problem and cut off the pulp and seal it. How does a Knife Gate Valve Work Out of this ingenious feature, knife gate valves have emerged to be more than popular when it comes to places that transport viscous fluids, slurry and other things alike. Today, knife gate valves are used in many processing plants and are larger in size, which makes it easier to handle dense fluids such as light oil, heavy oil, varnish, mud, waste water, and pulp. It should be noted that these valves have low pressure limits, and after the blade cuts the material it handles, the blade will return to the elastomer seal. Thick liquid can smoothly slide over these soft seals, however, when solid substances or powders pass through the knife gate, these rough substances will eventually accumulate in the soft seal at the end of the knife gate. When this happens, the sealing performance of these valves will wane. If this happens, the seal needs to be replaced. When not to Use Knife Gate Valves Knife gate valves can not be used to regulate the flow stream, because vibration occurs when the fluid is forced to flow through a partially closed gate valve and erodes the wedge and seat. Therefore, the knife gate valve can be used only when it is completely closed or opened.
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  • Dervos 520 event, show love to the one
    Dervos 520 event, show love to the one May 21, 2020
    Yesterday was 5.20, May the 20th. It may be a normal day for you, but to Chinese, it’s a love-theme day. This date is another Valentine’s Day holiday in China. That’s because, it may sound funny, ‘520’ sounds phonetically very close to“I Love You”, or“Wo Ai Ni”in Chinese. In that way, though it’s not official holiday, many people, especially couples, would celebrate the day. And as the concept prevails, more people join the group celebrating love--more than just the love between couples. Dervos, a work team full of love, also managed an activity to mark the day. Our administrative assistant Linda is so ingenious that she prepared such exquisite snacks, and the heart-shaped watermelon and colourful melon balls that won wow from everyone are too adorable to bite. Except delicious snacks, we also had a special game. In a little scrap of paper, every Dervos staff wrote down some words that say love, thanks or best wishes to someone anonymously, then put these scraps together and mixed up. Everyone of us took out one piece and read the words on the scrap to the recipient for the anonymous someone. It was a so moving scene that someone turned red when his or her paper was read and was recognized and someone had to say thank you to everyone because he or she don’t don’t who wrote it. Dervos believes love and is brave enough to express it out as loving someone and being loved both make us stronger. If you didn’t do things like us in 520, you could do it now. Never mind, it’s never to late to say 520.
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