Though the five-day-long holiday of International worker’s day is drawing near, Dervos people didn’t relax their pace of learning. Dervos held a training course of its new products designed as per API6A, API16A, API 16C on Thursday afternoon, in which we learned and reviewed much professional knowledge about valves and other relevant equipment. Even if China’s epidemic pressure has been significantly relieved, this time we took world-widely popular teaching form--online course, instead of face-to-face teaching, to avoid possible infection. When the course was over, our manager managed our sales to have a departmental meeting, discussing recent work and plans in the future. After the one-half-hour course, we enjoyed a gorgeous afternoon tea which consists of various fresh fruits that are elaborately shaped and two large durian pizzas. And there was a card with “大家辛苦了”，which means ‘Thank you for your endeavor’, on it. At end, we took pictures to celebrate the leisure time and the coming holiday.Smile shines on everyone’s face.

Different valves work for different conditions. It is more than wrong If you think that valve is just a simple switch to cut off the flow just like a faucet (though faucet is actually a valve in some terms). But let explore further about how the valve works and how to select the right valve for the specific purpose! The valve used to cut off the flow The straight-through valve, with a relatively small flow resistance, is usually used to cut off the flow. On the contact, downward-closing valves like globe valve and plunger valve, which have a tortuous path, have higher flow resistance than other valves. Because of that, this kind of valve is used to control flow where high flow resistance is allowed. The valve used for flow control Usually we choose the valve that is easy to adjust the flow as the flow control. The downward-closing valve mentioned above works in this condition because its seat size is proportional to the stroke of the wedge. Rotary valve (plug valve, butterfly valve, ball valve), pinch valve and diaphragm valve can also be used to control the flow. But they are only applied within a limited valve diameter range. The gate valve uses a disc-shaped gate to make a transverse movement to the circular valve seat. It can control the flow rate only when it is about to close, so it cannot be used for flow control. Valve used to reverse and divert the flow In accordance with the need of reversing and diverting, this kind of valve has three or more channels. Plug valves and ball valves are more suitable for this. However, in some cases, other types of valves can also be used for reversing and diverting as long as two or more valves are properly connected to each other. Valve used for medium with particles Speak of transferring medium with floating particles in it, the best choice is to choose the valve whose disc slides along the sealing surface. The disc will wipe this area while it moves. If the disc moves vertically along the seat ring, particles may be stuck at the sealing part. Ball valve and plug valve will clean its sealing surface when they are working, hence, they can be put in particle-mixed medium transportation. At present, no matter in the pipeline system of petroleum, chemical industry, or in other industries, the application, operation frequency and service of the valve are ever-changing. To control or eliminate even the smallest leakage, the most important and critical equipment is the valve. The ultimate control of the pipeline is the valve, which plays a unique and reliable role in various fields.

As we all know, the valve works for medium at temperature -40 ℃ ~ -196 ℃ is called ‘cryogenic valve’. Cryogenic valves, including cryogenic emergency shut valve, cryogenic ball valve, cryogenic gate valve, LNG cryogenic valve, NG cryogenic valve, are usually found in chemical plants such as ‘300,000 tons of ethylene’ project and production of liquefied natural gas. Ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum, and other liquid media the cryogenic valve transfers are flammable and explosive. What is more, they are going to gasify and expand hundreds of times when the temperature rises. This kind of valve is always equipped with an extended bonnet or namely extended stem. That’s because: 1. The extended bonnet can prevent the stuffing box, which plays an important role in the cryogenic valve and other valves, from the damage of low temperature. As the temperature goes down, the packing will gradually become less elastic and lost its ability to prevent leakage. Then, medium freeze in the space between the packing and the stem, hampering the movement of the stem and scratching the packing as the stem moves. In the end, what follows is severe leakage. Therefore，a extended stem is used to ensure that the packing is warm enough, at least above 8 ℃. 2. The extended structure of bonnet makes it convenient to wrap special materials around the valve, preventing the loss of cold energy. 3. The pipes and valves are often installed in the so-called 'cold box', but its ‘long neck’ can go through the wall of the 'cold box'. Based on that, The extended stem makes it convenient to dismantle or replace the main parts of the valve quickly through the bonnet. Hence，the valve body and the pipeline are welded together to reduce the leakage of the cold box as much as possible and ensure the sealing performance of the valve.

Dervos started a face masks donation plan half months ago and has donated more than 5,000 pieces of mask overseas. Recently, Our recipients gradually received the sought-after protective devices and expressed back their kind and thankful words. “That was sing (song) of kindness and solidarity”, Brunno said. Then the Brazilian man attached a string of red hearts gratefully. Sam Webb, from the UK, wrote in his email: “This will be a massive help and I will not forget it.” Marcos Coello, general manager of a Spanish company, said that: “On my behalf and on behalf of my team, I would like to thank the face masks you sent to us. We highly appreciate it.” Gonzalo Martinez and Jose Fuentes, both located in Spain, have also received our packages. What’s interesting is that Gonzalo Martinez refused our donation with thanks at first. He noted that they were at home as much as possible and said “so we will not be exposed. So please keep them in your facilities in case of something happens in the future.” But when he knew that our packages were on the way, Matinez took our staff’s advice, deciding to send these masks to local hospitals to help those in greater need once upon packages arrive. Coronavirus is threatening the whole world. But it also built a stage to show the strength and solidarity of the human as a community of shared future. Though Dervos is just a valve supplier, but it also concerns the well-being and happiness of everyone and tried to do something helpful. As Jose Fuentes said, “if we all strictly follow the regulations we will be able to slowly isolate the virus.” Please carry on and forge ahead, victory will be ours in the end.

Dervos posted it’s first batch of supplies,of which consists 14 packages, carrying 3200 pieces of disposable medical mask and 500 KN95 masks, to Hungary, Spain,Romania and other 11 countries respectively to help local fight against the rampant novel virus. Dervos itself doesn’t have any ability to produce medical supplies, but inspired by the noble helps from other countries two months ago, we now also want to share the burden over and lend a hand to those in need of these simple protective devices. To do so, we have tried our best to collected a mount of face masks from several qualified producers, then we would like to donate them. As long as you are really in need, please don’t hesitate to contact us via: Noah Luo Tel:   +86-0592-5185602 E-mail: noah@dervosvalve.com We will try to send them to you by post and charge you nothing. In the face of Coronavirus, no one should be left alone. Dervos will be the one backs you, fighting for the silver line behind dark clouds of Covid-19.

From the very beginning of 2020, Coronavirus has emerged as a global problem. Thanks to all the generous help from all over the world before, China has gained a relatively stable situation. Though we’ve won a reprieve , with 0 new cases in Wuhan and two-digit new cases found in other parts of China, Dervos people also concern the tough situation of the rest of the world at the same time. We’ve learned the difficulties to buy health-care supplies in some countries. Dervos doesn’t produce face mask, however, Dervos people are more than willing to help,with masks from certified providers, and post them for free to the one who really needs. No matter who you are and where you are, our customers or not, as long as you are in need,we are in full preparation and passion to help you. Please don’t hesitate to contact: Noah Luo Tel:   +86-0592-5185602 E-mail: noah@dervosvalve.com In addition, here are some helpful tips concluded from our experiences for you: 1. Stay home Home is the safest place. 2. Clean your hands often Wash your hands with soap and water for at least 20 seconds every time. 3. Cover your coughs and sneezes Use a tissue when you cough or sneeze and then throw it away. If you don’t have one, cough or sneeze into your elbow. 4. Clean all surfaces that are touched often High-touch surfaces include counters, tabletops, doorknobs, toilets, phones, keyboards,etc. 5. Less public vehicles use When you are going out, reduce the frequency to use public vehicles as much as you can and stay safe distance with others. As a global family, we have the same enemy to defend and conquer. Dervos will be always by your side and support you. Shelley wrote if winter comes, can spring be far behind？We believe that victory is on the horizon.