There are many types of valves and their range of use is also wide. If used improperly, there may be "running, emitting, dripping, and leaking" phenomena, with mild cases affecting production and severe cases causing accidents. So understanding and correctly using valves is a very important issue. There are many types of valves used in heating systems. For example, gate valves, globe valves, ball valves, butterfly valves, check valves, safety valves, regulating valves, balance valves, self-operated balance valves, and so on. 1. Gate valve, is a widely used type of valve. The sealing surface of the gate and the valve seat are highly smooth, flat, and consistent, and processed into a very close fitting and tight sealing pair. The gate plate conducts and shuts off the medium through the upward and downward pressure of the valve stem. It plays a shut-off role in the pipeline. 2. Globe valves are also widely used valves. Its working principle is similar to that of a gate valve, except that the closing part (valve disc) moves along the centerline of the valve seat. It plays a shut-off role in the pipeline and can also roughly adjust the flow rate. 3. Compared to gate and globe valves, ball valves are a new type of valve that is gradually being widely adopted. The valve core is a ball with a through cavity, which is controlled by the valve stem to rotate 90 ° to make the valve unobstructed or blocked. It plays a shut-off role in the pipeline. 4. Butterfly valves are currently the most widely used and diverse valve in heating systems. The valve disc is a disc that rotates through the valve stem and rotates at 90 ℃ within the valve seat range to achieve valve opening and closing. It plays a shut-off role in the pipeline. It can also adjust the flow rate. 5. Check valves are also known as single flow valves. It is a commonly used auxiliary valve. It is a valve that automatically opens and closes based on the force of the fluid itself and the weight of the valve disc. As the name suggests, its function is to prevent media backflow. Usually installed at the outlet of the water pump to prevent damage caused by water hammer. 6. The regulating valve is also called a control valve. It is a commonly used valve in the secondary network of heating systems. Its appearance and structure are similar to that of a shut-off valve, but the sealing pair is different. The valve disc and seat of the regulating valve are similar to the cork and mouth of a warm water bottle, and the flow rate is adjusted by changing the flow area through the movement of the valve disc. There is a ruler on the valve shaft indicating the corresponding flow rate. 7. Improved balance valve control valve. The flow channel adopts a direct current type, and the valve seat is changed to polytetrafluoroethylene. It overcomes the disadvantage of large flow resistance, makes the sealing more reasonable, and also has a cut-off function. 8. Self operated balance valve, also known as flow control valve. The...

The Numerical Control Multi-Pass Valve plays a crucial role in automating well selection and metering within oilfield metering stations. It replaces multiple metering pipe manifolds and electrically actuated three-way valve assemblies, streamlining well selection. Operated through control system automation or manual actuation, it enables automatic well switching, offering benefits like a compact footprint, streamlined operation, unmanned capability, and simplified installation. It can also be customized for specific needs, making it ideal for modernizing aging oil and gas metering stations on offshore platforms, artificial islands, and remote onshore areas. Features 1. Media Versatility: The valve handles various mediums, including light crude, heavy crude, oil-contaminated water, and clear water. 2. Simplified Operation: Streamlined control through a single multi-pass valve eliminates complex adjustments. 3. Cost-Effective: Fewer control units lead to investment savings of 20% to 30% compared to conventional systems. 4. High Sealing Performance: Self-compensating sealing and snug integration ensure zero leakage, supported by manual adjustments for maintenance. 5. Precision Engineering: Advanced positioning technologies enable near error-free well selection. 6. Durability and Efficiency: The hard-faced alloy sealing surface resists erosion, scaling, and extends service life. 7. Optimal Pressure Management: The system maintains a maximum pressure loss below 0.025 MPa.

According to the different structures of butterfly valves, we distinguish four types of butterfly valves: concentric butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves and triple eccentric butterfly valves. Concentric butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves and triple eccentric butterfly valves actually reflect a process of opening and closing with less and less effort and less and less wear on the sealing surface. By setting the position of the rotating shaft of the butterfly valve wedge, the sealing and opening states of the butterfly valve can be changed. Under the same conditions, the torque of the valve is greater than that of each opening. When the valve is opened, the rotation angle required for the valve plate to separate from the seal is smaller than the other. The structural feature of the concentric butterfly valve is that the shaft center of the valve stem, the center of the butterfly plate and the center of the valve body are at the same position. Generally, if concentric butterfly valves can be used, they should be used as much as possible. Because the concentric butterfly valve does not require high sealing performance in terms of structure or operation, it is a conventional product. To overcome squeezing, scraping, and ensure sealing performance, the valve seat of the concentric butterfly valve is basically made of elastic materials such as rubber or polytetrafluoroethylene, which is a soft sealing butterfly valve. This limits the use of concentric butterfly valves to temperature. In order to solve the squeezing problem between the butterfly plate and valve seat of the concentric butterfly valve, a single eccentric butterfly valve has also been produced. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate. Double eccentric butterfly valves are the most widely used. Its structural feature is that the valve stem axis deviates from both the center of the butterfly plate and the center of the valve body, thus it is called a double eccentric butterfly valve. Many double eccentric butterfly valves are line sealed, causing friction between the butterfly plate and the valve seat when the sealing surface is closed, resulting in excellent sealing effect. It has the characteristics of small area and high pressure. After the valve is opened, the butterfly plate can quickly detach from the valve seat, greatly eliminating unnecessary excessive compression and scraping between the butterfly plate and the valve seat, reducing the opening resistance distance, reducing wear, and improving the service life of the valve seat. The triple eccentric butterfly valve has undergone a third eccentricity on the basis of the double eccentric butterfly valve, and the shape of the sealing pair is not a straight cone, but an inclined cone. It is mostly short distance force and surface sealing. The stem shaft of a three eccentri...

We are thrilled to announce that Dervos has held a momentous celebration in Beijing, commemorating the company's remarkable 15-year journey. The joyous gathering brought together clients from different countries, forging deeper connections and strengthening the bonds between Dervos and our valued partners. It was a heartwarming occasion to express our sincere gratitude for the trust they have placed in us over the years. During the event, Dervos' founder Eric and Ken expressed heartfelt gratitude to clients, their valuable insights and feedback continuously inspire us to improve our products and services, allowing us to stay at the forefront of the industry. At Dervos, we take great pride in recognizing and supporting our employees' growth. With a team of experienced professionals, we strive to provide outstanding services to our clients. Dervos proudly recognized two remarkable employees, Jona and Susie, for their five years of dedicated service. The custom-crafted rings and necklaces, bearing their names and heartfelt wishes, symbolize our appreciation for their valuable contributions. In addition, we curated eight dragon-shaped molds, each concealing intriguing surprises. Once everyone selected their preferred dragon, they eagerly commenced the excavation process, which proved to be an engaging physical activity. After a brief endeavor, each participant successfully unearthed their coveted treasure: personalized seals with their names intricately engraved, adding a profound sense of commemoration to the occasion. We were delighted to receive heartfelt wishes from our customers. During the event, we invited them to inscribe their blessings to Dervos on Xuan paper and seal it with their personal stamp. To mark the occasion, Eric and Ken imprinted Dervos' seal, symbolizing the enduring bond between Dervos and our partners. This act beautifully encapsulates the spirit of unity and mutual commitment, reaffirming that Dervos and our partners will stand together through the test of time. Amidst the jubilant ambiance, the Dervos team couldn't resist showcasing their individual talents. West's soulful voice filled the air with a captivating song, while Sheila mesmerized the audience with her fiery dance performance. The infectious spirit of celebration inspired everyone to join in the revelry, creating a harmonious dance ensemble as they moved in sync with the joyful rhythm. Reflecting on the past 15 years, Dervos has achieved significant milestones and overcome numerous challenges, growing from strength to strength. Our commitment to excellence, innovation, and customer satisfaction has been the driving force behind our enduring success in the global market. Dervos looks forward to many more years of shared success with our esteemed clients, as we continue on this remarkable journey together.

Every year, Dervos prepares a cultural trip for employees. After everyone's vote this year, Beijing stood out. As the capital of China, Beijing is a city with a long history and culture, with numerous historical sites and cultural landscapes. Among them, everyone is familiar with Tiananmen, the Palace Museum, Yuanmingyuan Park, the Prince Gong's Mansion, the Temple of Heaven, the Great Wall and so on. This time we have eight days to follow the tour guide's footsteps, gradually appreciate the beauty of the buildings, and listen to the historical changes. During our trip, Beijing reached a rare high temperature of 40°C. But everyone's enthusiasm for visiting remained unwavering. For this reason, everyone encouraged each other and helped each other, not only challenged themselves, but also conquered the high temperature. As the saying goes, "He who does not reach the Great Wall is not a true man. "So we ended our trip with the project of climbing the Great Wall. The weather that day was very bad, with strong winds and heavy rain, which brought us many difficulties in climbing. But the Dervos people challenged themselves, never gave up, and successfully reached the pinnacle. Work hard, play hard. This trip allows everyone to break free from busy work, adjust their state, and better immerse themselves in work.

The sealing surface of the valve is a vulnerable component of the valve due to frequent corrosion, erosion, and wear from the medium. Automatic valves such as pneumatic ball valves and electric butterfly valves have frequent and fast opening and closing speeds, and the quality of their sealing surfaces directly affects the service life of the valves. The basic requirement for valve sealing surface is to ensure safe and reliable sealing under specified working conditions. Therefore, the material of the valve sealing surface should have the following characteristics. 1. Good sealing performance. The sealing surface should be able to effectively prevent the leakage of the medium; 2. A certain strength. Under the action of medium pressure difference, the sealing surface should be able to withstand the sealing specific pressure value formed by it; 3. Corrosion resistance. The sealing surface should have strong corrosion resistance that is suitable for the design requirements under the long-term action of corrosive media and stress; 4. Ability to resist scratches. The valve sealing pairs are all dynamic seals, and there is friction between the sealing pairs during the opening and closing process; 5. Erosion resistance. The sealing surface should be able to resist the erosion of high-speed media and the collision of solid particles; 6. Good thermal stability. The sealing surface should have sufficient strength and antioxidant capacity at high temperatures; At low temperatures, it should have good resistance to cold brittleness; 7. Good processing performance. Easy to manufacture and maintain, the valve functions as a universal component, ensuring economic value.