The options for ball valves seem endless. In order to choose the right ball valve, you have to decide which seat material? What kind of terminal connection? Full, Reduced or Standard Port? 2-way or multi-port type? the packaging?   In this article, we will discuss when you should use a three-piece ball valve.   What is a 3-piece ball valve?   Ball valves fall in one-piece, two-piece or three-piece. One-piece ball valves are relatively cheap and usually require no maintenance. A two-piece ball valve consists of two separate parts that are connected by a threaded or bolted and flanged assembly.   According to this law, you may have guessed that a three-piece ball valve consists of three pieces. Yes, there are two end caps and a valve body. The end caps are either welded, threaded or flanged to the piping on either side of the valve.   Why use a three-piece ball valve?   For projects with a large number of valve requirements, three-piece ball valves are more convenient than one-piece or two-piece ones. When seats and seals need to be replaced periodically, three-piece valves can be easily disassembled, repaired and reassembled without major cuts to the piping.   Three-piece ball valves also allow replacement of elastomers to accommodate different process conditions, temperatures, pressures and flow rates.   Do you need to weld the valve in the field? Another benefit of a 3 piece ball valve is the fact that it can remove the valve body and trims while welding. Because that, the body and trims can be kept intact.   What is the biggest difference between a 2 and 3 piece ball valve?   The two-piece ball valve was also designed in the view of easy maintenance. The major difference between the two is that the valve body on a three-piece valve can be removed without disturbing the two end caps. Two-piece ball valves usually do not allow this, let alone one-piece ball valves.   There are, of course, price differences. As mentioned earlier, one-piece valves are usually disposable. Three-piece valves tend to cost more initially, but in the long run, maintenance costs and the ability to replace the seat and seals should be kept in mind rather than replacing the valve.

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.

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.

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.    

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.

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.