16" x 12" 600LB trunnion mounted ball valve is made according to API6D standard. The valve body is made of A105. It has the structural characteristics of split type, side mounted, fixed ball, reduced diameter. Its connection mode is RF. And it has pneumatic operation mode.
16" 150LB double eccentric butterfly valve twins are made according to API 609 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of high performance and dual eccentricity. Two valves share one worm gear head. Its connection mode is wafer. And it has turbine operation mode.
1" 300LB steam trap valve is made according to GB/T22654-2008 standard. The valve body is made of LF2 CL1. It has the structural characteristics of thermodynamic type. Its connection mode is RF.
2" 300LB change over valve is made according to ASME B16.34 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of plug cover, the overall internal material is F316L. Its connection mode is RF. And it has Handwheel operation mode.
12" 1500LB cast steel slab gate valve is made according to API 6D standard. The valve body is made of A216 WCB. It has the structural characteristics of body cover bolt, full flow, cleanable pipe, anti-fire design. Its connection mode is RTJ. And it has gearbox operation mode.
DN200 PN16 angle bellows sealed globe valve is made according to BS EN 13709 standard. The valve body is made of EN 10213 1.4408. It has the structural characteristics of body cover bolt, exposed pole bracket, angle type, bellow seal. Its connection mode is RF. And it has hand wheel operation mode.
DN300 PN63 ball valve is made according to API 6D standard. The valve body is made of ASTM A105. It has the structural characteristics of fixed ball, full bore, anti-fire, anti-static, and anti-flying valve stem. Its connection mode is EN1092-1 D. And it has worm wheel operation mode.
16" 900LB ball valve is made according to API 6D standard. The valve body is made of A350 LF2. It has the structural characteristics of fully welded, fixed ball and full bore. Its connection mode is BW. And it has turbine operation mode.
Have you ever faced the challenge of selecting the right globe valve disc during pipeline system design or operation? When using a globe valve to control fluid flow, the disc type directly affects sealing performance, flow regulation, and suitability for specific conditions. Understanding the types of discs and their applications can help you make faster, more accurate selections and improve overall system efficiency. Flat / Standard Disc Features: The disc has a flat sealing surface, simple structure, and relatively low manufacturing cost. Applications: Commonly used for water, steam, air, and other low-viscosity media. Suitable for medium to low-pressure systems. Pros & Cons: Provides basic and reliable shutoff, but sealing reliability is moderate. Under long-term high pressure or high temperature, the sealing surface may wear more quickly. Conical / Tapered Disc Features: The disc is conical in shape, matching the sealing surface of the valve seat with a smaller contact area. Applications: Ideal for high-pressure conditions or systems requiring precise shutoff, such as steam and oil pipelines. Pros & Cons: Offers excellent sealing performance, but requires greater operating torque for opening and closing. Plug / Concave Disc Features: The disc surface is slightly convex, forming point contact with the valve seat, offering high sealing precision. Applications: Suitable for gases, liquids, and some corrosive media, allowing effective flow regulation. Pros & Cons: Manufacturing cost is higher, but sealing performance and wear resistance are superior to flat discs. Double Disc Features: A large disc contains a smaller inner disc. Applications: Commonly used in high-pressure, large-diameter valves. It helps balance pressure and extend valve service life. Pros & Cons: Structurally more complex and more expensive, but ideal for high-pressure, large-diameter applications. Conclusion Globe valve discs come in a variety of types, each with unique advantages and suitable working conditions. When selecting a disc, consider the medium type, pressure, temperature, and flow requirements. Choosing the correct disc ensures reliable system sealing, extends valve life, and reduces maintenance costs.
If you have ever experienced project delays due to valve quality issues, or are in the process of selecting qualified valve suppliers for an upcoming industrial project, then understanding the essential inspection reports required when purchasing gate valves becomes critically important. As a key control component in piping systems, the quality of a valve directly affects the safety and reliability of equipment operation. Therefore, when purchasing gate valves, buyers should not only focus on price and delivery time but also ensure that the supplier can provide complete inspection reports. Mandatory Inspection Reports ● Material Test Report (MTR) Purpose: To verify that the main components of the valve, such as the body, bonnet, and stem, meet the specified material standards (e.g., ASTM, DIN, EN). Importance: Prevents valve failure under corrosive or high-pressure conditions due to substandard materials. ● Pressure Test Report Hydrostatic Test: Checks the valve’s strength under the specified pressure. Air Tightness Test: Ensures the valve does not leak at operating pressure. Importance: Confirms that the valve meets the required design pressure rating. ● Dimension Inspection Report Content: Verifies whether valve structural length, flange dimensions, wall thickness, etc., comply with design and standards (ANSI, EN, GB). Importance: Ensures proper alignment with the piping system and prevents installation deviations. ● Non-Destructive Test (NDT) Report Methods: Includes Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT). Importance: Verifies that castings or welds are free from internal defects, enhancing the valve’s long-term operational reliability. ● Coating & Painting Test Report Content: Checks paint thickness, adhesion, hardness, salt spray resistance, etc. Importance: Ensures the valve has strong corrosion resistance for outdoor, marine, or chemical environments. ● Final Inspection Report Content: Includes comprehensive records of appearance, operational performance, markings, packaging, and other inspection items. Importance: Demonstrates that the valve has undergone strict quality control before delivery. Conclusion When purchasing gate valves, requiring suppliers to provide complete inspection reports is not only a verification of product quality but also a guarantee of overall project safety and reliability. By reviewing these reports, customers can reduce operational risks, lower maintenance costs, and extend the service life of their equipment. Q&A Q1: Why is a Material Test Report (MTR) mandatory when purchasing gate valves? A1: Material determines the valve’s pressure resistance, corrosion resistance, and service life. Different operating conditions require specific materials, so an MTR is necessary to verify compliance. Q2: Is Non-Destructive Testing (NDT) require...
Stainless Steel Flanged Ball Valve is a commonly used industrial valve. Its closure element (the ball) is driven by the valve stem and rotates around the axis of the ball valve, thereby enabling the opening and closing of the pipeline as well as fluid control. In addition to simple on/off functions, stainless steel flanged ball valves can also be used for fluid regulation. In particular, hard-sealed V-port ball valves, relying on the strong shearing force between the V-shaped ball core and the hard alloy-welded seat, are especially suitable for media containing fibers or fine solid particles. In industrial applications, multi-port stainless steel flanged ball valves can flexibly achieve medium merging, diversion, and flow switching, while also being able to shut off any single passage to ensure normal operation of the remaining pipelines. these valves generally require horizontal installation to maintain long-term stable performance. According to the driving method, stainless steel flanged ball valves can be classified into manual, pneumatic, and electric types, meeting the needs of different operating conditions. Standards for Stainless Steel Flanged Ball Valves To ensure reliable performance and consistent quality, stainless steel flanged ball valves comply with the following standards: • Design and Manufacturing: GB12237-89, API608, API 6D, JPI 7S-48, BS5351, DIN3357; • Flange Dimensions: JB/T74–90, GB9112–9131, ANSI B16.5, JIS B2212–2214, DIN2543,EN1092; • Face-to-Face Dimensions: GB12221-89, ANSI B16.10, JIS B2002, DIN3202,EN558; • Inspection and Testing: JB/T 9092, API 598,API6D. These standards not only guarantee the interchangeability and compatibility of the valves but also ensure their safety and reliability in various industrial environments. Models and Specifications of Stainless Steel Flanged Ball Valves Common models and parameters of stainless steel flanged ball valves include: Electric Flanged Ball Valve Q941F: Size DN15–200, Pressure 0.6–10 MPa, Material: Cast Steel / Stainless Steel Carbon Steel ANSI Ball Valve Q41F: Size DN15–200, Pressure 150LB–900LB, Material: Carbon Steel / Cast Steel ANSI Stainless Steel Ball Valve Q41F: Size DN15–200, Pressure 150LB–900LB, Material: Stainless Steel Worm Gear Flanged Ball Valve Q341F: Size DN15–200, Pressure 0.6–6.4 MPa, Material: Carbon Steel / Stainless Steel Pneumatic Stainless Steel Ball Valve Q641F: Size DN15–200, Pressure 0.6–6.4 MPa, Material: Stainless Steel Main Features of Stainless Steel Flanged Ball Valves • Excellent Wear Resistance: The core of the hard-sealed ball valve is overlaid with alloy steel, and the valve seat is surfaced with alloy steel, ensuring strong wear resistance. • Reliable Sealing Performance: Precision grinding guarantees a perfect fit between the ball and the seat, prev...
YPFB (Yacimientos Petrolíferos Fiscales Bolivianos) as Bolivia's state-owned oil and gas company, plays a critical role in the exploration, production, and distribution of oil and natural gas across Bolivia. It has a strong commitment to quality and innovation. DERVOS VALVE is honored to have passed the qualification review and become one of contract valve suppliers of YPFB. • Supplier Qualification Requirements for YPFB Becoming a supplier for YPFB requires meeting several stringent qualifications. YPFB looks for suppliers with a proven track record of reliability, technical expertise, and product quality. This includes compliance with international industry standards and certifications,along with the ability to provide high-performance products that meet the specific needs of Bolivia’s oil and gas industry. The process also involves submitting detailed technical documentation, including certifications, safety records,and previous successful project references. • Application Process to Become a YPFB Supplier The application process to become a certified supplier for YPFB is highly competitive and rigorous. The first step is to submit an official application, followed by a review of the company’s credentials. Dervos Valve underwent this process and provided comprehensive technical documentation, including product specifications and compliance with safety standards. Our team also participated in interviews and site visits, showcasing our manufacturing capabilities and commitment to quality. DERVOS VALVE will supply a range of valves to YPFB for use in their oil and gas operations, including high-performance ball valves, gate valves, globe valves, and check valves. These products are crucial for ensuring the safety and efficiency of operations in challenging conditions. Dedicated to consistent product quality through daily operations, we ensure excellence in performance. Our ongoing commitment is providing partners with professional support and premium services, fostering mutual growth and win-win success.
To mark this milestone in Dervos Valve’s journey, we came together not just to celebrate, but to connect with the partners who have supported us along the way. This anniversary is a tribute to enduring partnerships and a sha- red vision for the future. On the occasion of Dervos Valve’s 17th anniversary, our valued partners were specially invited to visit our headquarters for in-depth, face-to-face exchanges with the team. These meaningful interactions deep- ened mutual understanding andtrust, laying a solid foundation for even stronger cooperation in the future. Accompanied by our team, the clients toured the office area and were introduced to colleagues from various departments. The interactions were relaxed and friendly, creating a warm atmosphere that further strengthened mutual understanding. Following the tour, our sales team delivered a themed presentation on “Dervos 17th Anniversary,” offering the clients a comprehensive overview of the company's development journey, core strengths, and service philosophy. We also expres- sed our heartfelt gratitude and warm welcome to our valued partners. Through this session, the clients gained a deeper understanding of Dervos, enabling us to better tailor our services to their needs. They expressed strong appreciation for Dervos’ steady growth and thanked us for inviting them to be part of this meaningful celebration. In front of the company’s cultural wall, clients took a moment to sign and leave messages, expressing their well wishes for Dervos. This moment not only reflected cultural recognition but also a genuine expression of the emotional bond and trust shared through our partnership. Next, we arrived at the highlight of the anniversary celebration— the Dervos Valve 17th Anniversary Gala Dinner, a moment of gratitude and shared celebration. We arranged a visit to the "Yu Jian Minnan" Cultural Park for our clients, where they explored the ancient architectu- ral district and experienced the traditional art of rubbings, immersing themselves in the charm and craftsman- ship of Chinese culture. In the evening, a red carpet was laid out in front of the hotel, where the Dervos team warmly welcomed guests, coming together with partners from around the world to witness this moment of honor. As the lights came on, the anniversary gala dinner officially began. The venue was decorated in a grand and festive style, with a warm and lively atmosphere. The event kicked off with a performance that blended both Eastern and Western cultures,featuring a lineup of classic foreign songs and traditional Chinese pieces, showcasing Dervos' open and inclusive brand spirit, with a global outlook. During the interactive games and lucky draw sessions, guests actively participated and enjoyed themselves, with laughter and joy filling the air. This lively atmosphere showcased the cohesion and energy of the Dervos team. As the familiar melo...
On the occasion of Dervos Valve’s 17th anniversary, we proudly continued our tradition by inviting partners from Australia, Turkey, Italy, Russia, Argentina, South Africa, the United States, and other countries to gather in the ancient city of Xi’an to witness this milestone together. This event was not only a continuation of long-standing partnerships but also a testament to mutual trust. Dervos warmly welcomed our global partners, and through in-depth exchanges, both sides further deepened cooperation and understanding. The gathering showcased Dervos’ openness as a global valve brand and its confidence in sharing Chinese culture. To help our overseas guests gain deeper insights into Chinese heritage, we thoughtfully organized a cultural tour of Xi’an. Highlights included visits to the UNESCO-listed Terracotta Warriors, a walk atop the ancient city wall, scenic views at the Giant Wild Goose Pagoda,and hands-on experiences such as trying on traditional Hanfu attire—activities that were greatly enjoyed by our international friends. In front of the Terracotta Army of Emperor Qin Shi Huang, our guests were deeply impressed and inspired as they carefully admired the grandeur of this underground legion. Captivated by its majestic scale and historical significance, they took group photos to commemorate the moment—creating unforgettable memories of thisawe-inspiring experience. Guests strolled leisurely beneath the Xi’an City Wall, taking photos and sharing conversations, while enjoying the rich blend of history and culture that surrounds this ancient landmark. Guests strolled leisurely beneath the Giant Wild Goose Pagoda, soaking in the unique charm of Xi’an where history and culture intertwine. Our international guests enthusiastically took part in trying on traditional Hanfu and sampling Xi’an’s signature local cuisine. They frequently paused for photos, fully immersed in the authentic cultural atmosphere. The first leg of Dervos’ 17th anniversary celebration came to a successful close, leaving every participant with joyful memories. More than just a journey, the Xi’an visit deepened the trust and friendship between Dervos and its global partners. The Xi’an journey marks only the beginning of Dervos’ 17th anniversary celebrations—more exciting events are on the way. We sincerely thank every partner for your continued support. Let us witness our growth together and stride toward a broader, brighter future.
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"Everything is perfectly made. We are grateful for the confidence you are showing in our organization and fully trust our hard-work will be fruitful for both of our companies. You are truly a GEM for Dervos Valves. Our best compliments to you!"
"Your customer service is outstanding. ... ... The check valves works fine and the customer service certainly makes up for it. ... ... The customer service couldn’t be better."
"We are very satisfied with all your kind business supports. You are always kindly answering all our questions. So, we thank you for all your efforts. When we have any new project, we will readily make a contact with you!"
"I’ve received your document today. Thank you so much. Our engineer says your report seems to have been done quite well, he appreciated, of course we haven’t got the vannes so we haven’t had a check, but I believe there won’t be problem, hope so."
"Thank you for engaging with our organisation regarding Dervos. We place various orders with Dervos and products were always completed ex-factory, to drawing and within the time periods indicated. Dervos is a very proud company and place huge emphasis in delivering quality products to their customers."