In 2026, DERVOS VALVE proudly celebrates its 18th anniversary, marking an important milestone in the company's journey. To commemorate this occasion, DERVOS VALVE organized a three-day anniversary celebration, bringing together all employees to reflect on the company's achievements over the past eighteen years, look ahead to future development, and further strengthen team cohesion through meaningful activities and shared experiences.   Reflecting on 18 Years of Growth   From raw material management and precision machining to assembly and product testing, every stage of production reflects DERVOS VALVE's unwavering commitment to quality.   Over the past eighteen years, DERVOS VALVE has continuously improved its manufacturing system while enhancing product quality and customer service capabilities. Today, our industrial valves are widely used across the oil and gas, chemical, power generation, water treatment, LNG, and other industrial sectors, providing reliable valve solutions to customers worldwide.   Building Consensus for Future Development     During the anniversary celebration, DERVOS VALVE also held its mid-year communication meeting.   The meeting reviewed the company's performance over the first half of the year and outlined key objectives for future development. Representatives from different departments exchanged insights on production management, quality improvement, and cross-functional collaboration, sharing practical experience, reviewing achievements, and discussing future goals together.   The meeting further strengthened communication among departments, reinforced team alignment, and injected new momentum into the company's long-term development.     Embracing Nature Together   In addition to the company's anniversary activities, DERVOS VALVE organized a group excursion to experience the beauty of nature.   Surrounded by picturesque landscapes, employees enjoyed the scenic environment and explored the local culture in a relaxed and enjoyable atmosphere. The trip provided an opportunity to unwind while fostering stronger relationships among colleagues.   This memorable experience enriched the anniversary celebration, strengthened team spirit, and inspired everyone with renewed energy for the work ahead.     Eighteen Years of Commitment, Looking Ahead   Eighteen years represent not only growth and achievement, but also the beginning of a new chapter.     Since its establishment, DERVOS VALVE has remained dedicated to the design, manufacturing, and global supply of industrial valves. Through continuous improvements in product development, manufacturing capabilities, and quality management, the company has provided reliable valve products and technical support to customers across a wide range of industries worldwide.   Looking ahead, DERVOS VALVE will continue to focus on product innovation, manufacturing excellence, and long-term...

Refineries operate under some of the most demanding process conditions found in the energy industry. High pressure, elevated temperature, sour media, corrosive fluids, and frequent thermal cycling place strict requirements on valve performance. In these environments, ball valves are widely used because they provide reliable shutoff, low pressure loss, and fast operation. However, selecting the best ball valve for refinery applications depends less on the valve type itself and more on matching the design to the process conditions.   Why Ball Valves Are Common in Refinery Service   Refinery units handle hydrocarbons, hydrogen, steam, sulfur compounds, and various aggressive chemicals. If bubble-tight isolation is required, then trunnion mounted ball valves are generally preferred for larger sizes and higher pressure classes because seat loading remains stable under differential pressure. Floating ball valves are more common in small-bore lines where compact dimensions and simple construction are advantageous.   API 6D and ASME B16.34 designs are frequently specified for refinery piping systems. Fire-safe construction in accordance with API 607 or API 6FA is often mandatory because accidental loss of soft seats must not result in external leakage. If the process medium contains hydrogen sulfide, then materials must comply with NACE MR0175 to reduce the risk of sulfide stress cracking.   Material Selection Depends on Process Media   Material compatibility is one of the primary factors affecting service life. Carbon steel valves are suitable for many hydrocarbon services, while stainless steel provides improved corrosion resistance in wet and chemically aggressive environments. Duplex and super duplex stainless steels are selected when chloride-induced corrosion becomes a concern.   If the process contains sulfur compounds or sour gas, then hardness control and material qualification become critical. In high-temperature applications, thermal expansion must be considered because excessive growth can increase operating torque and accelerate seat wear. If severe erosion is expected, then hard-faced balls and seats with tungsten carbide or chromium carbide coatings can significantly improve durability.   Sealing Performance and Failure Prevention   Soft-seated ball valves provide excellent shutoff performance, but seat materials determine their temperature limits. PTFE and reinforced PTFE are common in moderate-temperature services, while PEEK offers improved mechanical strength and higher temperature capability. If temperatures exceed the limits of polymer seats, then metal-seated ball valves become a more suitable solution.   Most valve failures in refineries are related to seat damage, stem leakage, or corrosion. If particulate contamination is present, then cavity fillers or metal seats may reduce wear. Double block and bleed configurations are often used where positive isolation is required for maintenance...

In natural gas transmission, district heating networks, petrochemical facilities, and industrial utility systems, ball valves are widely used for reliable flow isolation. One of the most common questions during valve selection is: Which provides better pressure resistance—a fully welded ball valve or a threaded ball valve?   Understanding the Structural Difference Between Fully Welded and Threaded Ball Valves   From a structural perspective, fully welded ball valves generally offer higher pressure-bearing capability. The valve body is manufactured using a fully welded construction, eliminating threaded body connections and reducing stress concentration points associated with mechanical joints. Under high-pressure conditions, frequent pressure fluctuations, or significant temperature changes, the welded structure can provide greater mechanical integrity and more stable sealing performance. Threaded ball valves, by contrast, rely on threaded connections to assemble the valve body. While this design simplifies installation and maintenance, threaded joints are inherently more susceptible to stress and deformation. As system pressure increases or when vibration and thermal expansion-contraction cycles are present, threaded connections may become vulnerable to loosening, potentially resulting in external leakage. Common field indications include leakage around the stem packing area, seepage from body connections, or accelerated wear of sealing components.   Why Fully Welded Ball Valves Typically Offer Higher Pressure Resistance   The primary advantage of a fully welded ball valve lies in its one-piece welded body construction. Without threaded body joints, the valve can better withstand internal pressure loads and reduce the possibility of leakage caused by connection failure.   In applications involving high operating pressures, pressure surges, or repeated thermal cycles, the welded structure maintains better dimensional stability and structural strength. This is one of the key reasons why fully welded ball valves are widely used in gas transmission pipelines, district heating systems, and other critical infrastructure projects.   How Sealing Performance Affects Pressure Capability   In high-pressure service, valve failure is not determined solely by body strength. The sealing system also plays a critical role. Fully welded ball valves typically utilize an integral body design that minimizes potential external leakage paths and provides more consistent support for the seat sealing surfaces.   In threaded ball valves, small dimensional changes at threaded joints during long-term pressure cycling may affect seat loading, potentially increasing the risk of internal leakage. If significant leakage, abnormal deformation, or pressure test failure is observed, the valve should be removed from service and inspected immediately. For flammable, toxic, or high-temperature media, disassembly and maintenance under pre...

Introduction   A pinch valve is a type of linear valve in which the flow of fluid is controlled by compressing a flexible sleeve. Unlike conventional metal-seated valves, pinch valves rely on a resilient elastomer tube that is “pinched” closed by a mechanical or pneumatic actuator to stop or regulate flow. This design allows full-bore flow with minimal obstruction when open and tight shut-off when closed, making pinch valves suitable for abrasive, corrosive, or slurry-type media.   Pinch valves are used across industries such as water and wastewater treatment, chemical processing, mining, pneumatic conveying, and slurry handling. Their simple structure and minimal internal components make them resistant to clogging, easy to maintain, and particularly effective in systems where suspended solids or corrosive chemicals are present.   Structure and Working Principle   The key element of a pinch valve is its elastomer sleeve, which serves as both the sealing surface and the flow channel. When the actuator compresses the sleeve against the valve body, the valve closes and prevents fluid passage. Releasing the pinch pressure allows the sleeve to return to its original shape, enabling full flow.   Valves may have manual, pneumatic, or electric actuators. The sleeve material—commonly natural rubber, EPDM, NBR, or specialty compounds—is selected based on chemical compatibility, temperature limits, and abrasion resistance. The valve body, typically made of carbon steel, stainless steel, or plastic, provides structural support and pressure containment.   Key Advantages and Engineering Considerations   Pinch valves are appreciated for their simplicity and reliability in handling challenging fluids. Because the sleeve is the only wetted component, there is minimal contact between the media and the valve body, reducing corrosion risk. They are inherently “full bore,” which minimizes pressure drop and makes them suitable for high-solids content flows.   However, their performance depends heavily on proper sleeve selection, pinch force, and actuator alignment. Misapplication—such as exceeding temperature limits, using incompatible chemicals, or operating with high-pressure abrasive slurry—can accelerate sleeve wear, affect sealing integrity, or shorten service life. For engineers and procurement professionals, specifying the correct sleeve material, actuator type, and pressure rating is crucial to ensure reliable operation.   Practical Advice for Industrial Use   Maintenance is generally straightforward: sleeve inspection, replacement schedules, and actuator calibration are the main tasks. In critical systems handling toxic, flammable, or high-temperature media, maintenance must follow strict lockout-tagout and isolation procedures. Selecting a sleeve material with both chemical resistance and abrasion tolerance is key to extending service life, while actuator force ...

Butterfly valves are widely used in industrial piping systems, but pressure capability depends heavily on valve design and operating conditions. In many projects, engineers initially compare conventional butterfly valves and eccentric butterfly valves based on pressure class alone. In actual service, sealing reliability, temperature, cycling frequency, and media condition usually have a greater impact on long-term performance.   A conventional butterfly valve uses a centered disc and stem arrangement. The disc stays in continuous contact with the seat during operation. This design is suitable for clean water systems, HVAC pipelines, cooling water service, and general utility applications where pressure and temperature remain relatively stable.   Under higher pressure conditions, several limitations become more noticeable:     ● seat wear increases because of continuous friction     ● operating torque gradually rises     ● leakage risk becomes higher after repeated cycling     ● elastomer seats may deform under pressure fluctuation   In saturated steam service, resilient-seated butterfly valves often experience early sealing problems when temperature exceeds the seat material limit. Even if pressure is technically acceptable, thermal aging can harden the seat and reduce shutoff reliability.   Eccentric butterfly valves were developed to reduce these problems. Double-offset and triple-offset designs allow the disc to separate from the seat during most of the operating stroke. This reduces friction and lowers seat damage during repeated opening and closing.   For high-pressure industrial systems, eccentric butterfly valves usually provide more stable sealing performance because the sealing surfaces experience less mechanical wear.   Why Eccentric Butterfly Valves Handle High Pressure Better   The biggest advantage of eccentric butterfly valves is not simply higher pressure rating. The main benefit is improved sealing stability under severe operating conditions.   In refinery piping, power plant steam systems, and high-pressure hydrocarbon lines, triple-offset butterfly valves are commonly selected because metal seats tolerate temperature fluctuation more effectively than soft seats.   This becomes important in conditions such as:    ● saturated steam service    ● thermal oil pipelines    ● high-cycle automated isolation    ● high differential pressure systems    ● elevated temperature applications   When pressure and temperature increase together, conventional butterfly valves often develop sealing instability faster than eccentric designs. Thermal expansion changes the contact pressure between the disc and seat, especially during repeated heating and cooling cycles.   In abrasive slurry service, erosion also becomes a major concern. Conventional soft seats can wear rapidly when exposed to suspended so...

Introduction Precise media control is critical in pharmaceutical manufacturing, particularly in purified water systems, clean steam lines, CIP/SIP processes, and dosing applications where flow instability can affect batch consistency and validation results. In these environments, selecting the best angle globe valves for precise flow control in pharmaceutical manufacturing is not only a matter of throttling accuracy, but also material compliance, cleanability, and long-term sealing reliability.   Unlike standard straight-pattern globe valves, angle globe valves reduce piping turns by combining directional change and flow regulation in a single body design. This configuration is commonly specified in skid-mounted pharmaceutical systems where compact layouts and drainability are required.   Angle Globe Valve Overview An angle globe valve operates with a 90-degree body configuration, allowing the process media to change direction while passing through the valve seat area. The valve plug movement provides accurate throttling capability, making it suitable for low-flow adjustment and stable pressure reduction. In pharmaceutical plants, angle globe valves are often installed in: ● WFI (Water for Injection) circulation loops ●  Clean steam distribution systems ●  CIP return lines ●  Bioprocess skids ●  Sterile chemical dosing systems For sanitary applications, forged stainless steel bodies such as ASTM A182 F316L or CF3M are preferred due to corrosion resistance and low ferrite content. Electropolished internal surfaces and low Ra finishes are frequently specified to minimize bacterial retention.   Where pressure containment is required, valve design standards such as American Petroleum Institute API 602 and ASME ASME B16.34 are commonly referenced for forged compact valves and pressure-temperature ratings.   Key Selection Considerations for Pharmaceutical Angle Globe Valves   Pressure Class and System Conditions Most pharmaceutical utility systems operate within Class 150 or Class 300 pressure ranges, although high-pressure clean steam systems may require Class 600 valves. The selected pressure class should consider:     ●  operating pressure     ●  steam cycling conditions     ●  thermal shock during SIP procedures     ●  actuator shutoff force   Undersized pressure ratings can lead to seat deformation and stem leakage after repeated thermal cycling.   Temperature Resistance   Steam sterilization systems can exceed 180°C during SIP operations. Standard PTFE soft seats may deform under prolonged exposure, especially in throttling conditions. For elevated temperatures, engineers often specify:     ●  metal-seated trim     ●  reinforced PTFE     ●  PEEK seat materials     ●  bellows-sealed bonnet designs   Bellows seals are particularly valuable in pharmaceutical proce...