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.

Pneumatic butterfly valve is a newly developeddurable energy-friendly butterfly valve.This kind of butterfly valve adopts new technologies such astriple eccentric design, elastic sealing,multilevel hard and soft sealing processing, so that the butterfly valves are more than reliable and they can achieve no leakageingas sealing. The pneumatic actuator adopts curved arm conversion structure, which has the characteristics of large output torque, small volume, stable and reliable performance, etc. It can be used with valve positioner. Or used in conjunction with solenoid valves, the device can achieve proportional regulation or switching control and is suitable for media such as gases, solid particles and liquids. Pneumatic butterfly valve can be widely used in paper, petrochemical, chemical, metallurgy, electric power, environmental protection, petroleum, light industry, building automation and automation control system of otherindustrial sectors. Installation and maintenance of pneumatic butterfly valve. 1. When installing the butterfly valve, you should pay attention to the flow direction mark on the valve body to avoid the wrong direction of flow and affect the use. 2. Beforethe use ofthepneumatic butterfly valve, you should flush the pipeline with the valve fully open to avoid the sealing surface being scratched by debris such as welding slag. 3. Generally, bypass piping will be set next to the butterfly valve so that when the butterfly valve is serviced or replaced, the bypass piping can be used to carry out the process as usual. 4. Pneumatic butterfly valve can be installed vertically within 180°。And do not install the pneumatic actuator upside down. 5. If you find that the stuffing box is leaking during use, tighten the gland bolts to solve the problem. Here atDervos, we’re a leading provider for products inindustrial valve, and we’re certified with theCE, 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—we can’t wait to work with you!

There are six major factors to consider when selecting valve sealing face materials. The sealing surface is the most critical working surface of the valve, the quality of the sealing surface directly affects the service life of the valve, and the sealing surface material is an important factor to ensure the quality of the sealing surface. Therefore, the following factors should be considered when selecting the valve sealing surface material. Corrosion Resistance. "Corrosion" is the process by which the surface of a sealingpart is damaged by medium. If the surface is damaged in this way, the sealability cannot be guaranteed; therefore, the sealing face material must be corrosion resistant. The corrosion resistance of a material depends mainly on its tensile strength and its chemical stability. Abrasion resistance. "Abrasion" is the damage caused by friction during the relative movement of the sealing surface. This damage will inevitably lead to the destruction of the sealing surface, therefore, the sealing surface material must have good anti-scuffing properties, especially the gate valve. The abrasion resistance of the material is often determined by the internal properties of the material. Erosion resistance."Erosion"refers thatthe medium flows through the sealing surface at high speed, so that the sealing surface is damaged. This damage is more obvious in the high temperature, high pressure steam medium used in the globe valve, safety valve. the sealing damage has a great impact, therefore, erosion resistance is also one of the important requirements of the sealing surface material. It should have acertain hardness, and the hardness decreases greatly under the specified working temperature. The coefficient of linear expansion of the sealing face and the body material should be similar, which is more important for the structure of the inlaid seal, in order to avoid additional stress and lose under high temperature. For use at high temperatures, there should be adequate resistance to oxidation, thermal fatigue, andthermal cycling issues. In the current situation, it is very difficult to find a sealing surface material that fully meets the above requirements. For example, for valves used in high speed media, specific attention should belaidto the requirements of erosion resistance of the sealing surface; when the medium contains solid impurities, sealing surface materials with higher hardness should be selected. 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—we can’t wait to work with you!

Project Name: ECOFUEL INNOVATION PROJECT Year：2017 Introduction: In 2017, we provided a major number ofvalves from regular gate valves to safety relief valves to an environmental project lead byECOFUEL, an emerging Canadian player inclean technology. It is atentative project for sustainable diesel production from solid waste.Dervos is proud to bea part of this fuel innovation actionand offers 136 sets of our reliable and outstanding valves for it. SEGMENT BALL CONTROL VALVE It’s also called V type ball valve, whichhasthebest regulating performance in ball valves. Plus cut-down function between the V-shaped slit and the metal seat, this kind of ball valve is particularly suitable for medium withfibers, solid particles and slurry. KNIFE GATE VALVES As the mediumcontains wooden debris and slurry, knife gate valves are suggestedin this condition for its good cut-down performance. THREE-WAY SPLIT FLOW VALVE Remotely controlled by electric actuators, this valvecan split the flow into twostreams andachieve precise controloverprocess parameters for fluid. SAFETY VALVE Conformed to API520 and API526, thesesafety valves arecustomized according toon-siteworking pressure, temperature and flow capacity for over-pressure protection.

Just like there are different advantages between lug or wafer type butterfly valves, 2 piece type and 3 piece type ball valves also have their edges. What below are some of the important factors when considering choices between the two types.   1. Design 2. End connections 3. Installation 4. Performance 5. Ease of maintenance   Design As their names imply, a 2-piece ball valve has two distinct pieces – one piece is an end connection and the body and a second piece, which has the other end connection as well as the valve trim.   A 3-piece ball valve has three body pieces – 2 ends and a center section that holds the valve trim. The three parts are bolted together around the three sections.   End Connections Because of their designs, two-piece ball valves are limited in the type of end connections they can make. They are usually limited to threaded end connections.   Three-piece ball valves have a swing design that allows for welded end connections, so socket and butt weld ends are often feasible.   Installation Its simple design makes 2-pc ball valve one of the most common types in many industries. Due to this simple design, the 2-pc ball valve is a lightweight solution for manual and automatic fluid or gas control.   If the end connection is threaded, the installation of the 3-pc type is also very straightforward. When it is necessary to weld the end, in order to prevent the valve seat and the sealing ring from being heat damage, the device have to be partially disassembled during the installation.   Performance The simplistic design of 2-pc valve allows itself, generally, a better Cv value. The seats, seals, applications and other parts in performance are more decisive than the design type.   Ease of Maintenance The oscillating design of the 3-piece valve allows the body section to remain in place while the valve section swings up and out of the line for cleaning or servicing. This feature makes the 3-pc stand out from the 2-pc, whose design does not allow for any maintenance. Applications where the media is thick or viscous, or where lines must be cleaned between batches, are almost always the domain of the 3-pc valve.   summary Based on the above information, the consideration of 2-pc or 3-pc must include various factors, including the length of the production line through its medium, flow, weight, and maintenance plan. The good news is that our technical sales staff will be more than happy to discuss these factors so that you can make the right decision.   Xiamen Dervos has served countless industrial, commercial, and municipal clients for over 10 years. We have supplied thousands of common valves, customized products, electric and pneumatic actuators and so on to customers worldwide.   If you would like to know more about our valves, services, or other products, any message or inquiries are welcomed.

A Chinese saying goes that knowledge begins with practice.It is an essential principle that we must combine theory with practice. And, then, as we planned in the mid-year meeting this year, the first group of our sales have arrived factory to launch a 3-week long field study there. This trip is aimed at promoting Dervos sales' acquaintance of valves with gate valve, globe valve and check valve taking the main course of it. And essentially, what's more important is that we hope our sales could be professional and more professional. In this way can they better help you solve your problem and finish your purchase. Our factory prepared well for this factory study. From Inventory management, production line, technique learning to packing and shipping, a wealth of lessons awaits for our sales. During almost a month of field study, in addition to grasping the whole producing process, assembling and packing, our sales spent a great amount of time in the storehouse in where they could learn the properties, differences, uses of each component and the reasons for the selection of different valve accessories. This is just the first group, the rest of our sales, no matter experienced or unskilled, will attend the trip in the next batch. Dervos is well aware of the hard time the whole industry even the whole world is going through. What we can try our best is to trained ourselves harder and provide more thoughtful solutions.