Trunnion mounted ball valve DN300 PN63 full bore Double Block and Bleed PMSS seal(metal seal+soft seal）blowout proof stem gearbox operation with LF2 body, LF2+ENP ball/seat and 410 stem. Quick Detail Type Ball Valve Size DN300 Design Pressure PN63 Construction DBB,Trunnion mounted ball valve ConnectionType Flange OperationType Gearbox Operated Body Material LF2 Ball Material LF2+ENP Stem Material 410 Seat Material LF2 +ENP Design Code API 6D Face to Face Dimension API 6D End Connection ASME B16.5 Pressure & Temp ASME B16.34 Medium Water, Oil and Gas Origin China
Y type globe valve. CF8 body/bonnet, F304 disc/stem, SS304+flexible graphite gasket and bronze bolt and nut. Plug type disc and Raised face flange connection. Quick Detail Type Globe Valve Size 4 inch DesignPressure CL150 Construction Y Type Globe Valve Connection Type Raised Face Flange Connection Operation Handwheel Design Code ASME B16.34 Face to Face ASME B16.10 Test & Inspection API 598 Body Material CF8 Temperature Range -29~538℃ Application WOG
Inverted Pressure Balanced Lubricated Plug Valve is 2 inch and WCB body with metal seated. Apply to temperature lower than 80℃. Quick Detail Type Plug Valve Size 2” DesignPressure 150LB Construction Lubricated Type Plug Valve Connection Type Flange Connection Operation Lever/Wrench Design Code API6D Face to Face ASME B16.10 End Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API6D Body Material A216 WCB Temperature Range <80℃ Application WOG
The 8 inch Class 2500 gate valve is designed with pressure seal bonnet, butt weld connection, and gearbox operation. The 8 inch gate valve has carbon steel WCB body and trim 5. Quick Detail Type Gate Valve Size 8'' Design Pressure ANSI 2500 Construction Pressure Seal Bonnet, Flexible Wedge, Metal to Metal Seat ConnectionType Butt Weld (SW) OperationType Gearbox Operation Body Material A217 WC6 TrimMaterial Trim 5 Design Code API 600 Face to Face Dimension ASME B16.10 End Connection ASME B16.25 Pressure & Temp ASME B16.34 Medium Water, Oil and Gas Origin China Dimension & Material NPS DN Class 2 2 1/2 3 4 6 8 10 12 14 16 18 20 24 50 65 80 100 150 200 250 300 350 400 450 500 600 L(RF) 900LB 368 419 381 457 610 737 838 965 1029 1130 1500LB 368 419 470 546 705 832 991 1130 1257 1384 2500LB 451 508 578 673 917 1022 1270 L1(BW) 900LB 216 254 305 355 508 660 787 914 991 1092 1346 1473 1600 1500LB 216 254 305 406 559 711 864 991 1067 1194 1697 2500LB 279 330 368 457 610 762 914 1041 1118 1245 L2(RTJ) 900LB 371 422 384 460 613 740 841 968 1038 1140 1500LB 371 422 473 549 711 841 1000 1146 1276 1407 2500LB 454 514 584 683 927 1038 1292 H(Opne) 900LB 554 637 680 796 1084 1372 1494 1550 1960 2210 1500LB 554 637 767 875 1094 1372 1655 1834 2150 2260 2460 2721 2940 2500LB 610 654 753 850 1254 1374 1685 1894 2226 2382 2585 W 900LB 300 350 350 400 560 460* 610* 610* 610* 760* 1500LB 300 450 450 560 305* 460* 610* 610* 760* 760* 2500LB 500 500 600 600 460* 460* 610* Weight (RF) 900LB 50 84 92 154 341 622 950 1295 1720 2380 1500LB 60 91 128 182 394 795 1370 2120 2800 3870 2500LB 121 175 195 229 720 1295 2250 Weight (BW) 900LB 39 64 82 120 266 524 760 1090 1450 2018 1500LB 46 71 85 130 292 578 974 1615 2010 2815 3315 4150 5219 2500LB 88 135 144 158 500 892 1550 1978 2580 3780 5988 *Manual gear operator is recommended No. Part WCB WC6 WC9 C5 CF8 CF8M 1 Body A216 WCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M 2 Seat A182 F6a A182 F22 A182 F22 A182 F5 A182 F304 A182 F316 3 Wedge A216 WCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M 4 Stem A182 F6a SAEHNV3 A182 F304 A182 F316 5 Stuffing Box A216 WCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M 6 Seal Ring ANSI 316L Flexible Graphite+316 7 Split Ring Steel F6 F6 F6 A182 F304 F316 8 Back Ring Steel Steel Steel Steel SS SS 9 Bolt A193 B7 A193 B7 A193 B7 A193 B7 A193 B8 A193 B8 10 Nut A194 2H A194 2H A194 2H A194 2H A194 Gr.8 A194 Gr.8 11 Yoke A216 WCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M 12 Bolt A193 B7 A193 B7 A193 B7 A193 B7 A193 B8 A193 B8 13 Nut A194 2H A194 2H A194 2H A194 2H A194 Gr.8 A194 Gr.8 14 Packing Plate ANSI 410 ANSI 410 ANSI 410 ANSI 410 ANSI 304 ANSI 316 15 Packing Flexible Graphite(Braided and Ring) or PTFE 16 Split Pin Steel Steel Steel Steel Steel Steel 17 Eyebolt A193 B7 A193 B7 A193 B7 A193 B7 A193 B8 A193 B8 18 Gland A182 F6 A182 F6 A182 F6 A182 F6 A182 F304 A182 F316 19 Gland Flange A105 A105 A105 A105 A182 F304 A182 F316 20 Nut A194 2H A194 2H A194 2H A194 2H A194 Gr.8 A194 Gr.8 21 Stud A193 B7 A193 B7 A193 B7 A193 B7 A193 B7 A193 B7 22 Stem Nut Ni-resist A439-D2 23 Gear Box Purchased 24 Protector Steel 25 Nameplate ANSI 304 26 Rivet ANSI 304
The 8 inch 150 LB dual disc non return check valve, designed per API 594, has dual plate and lug connection. The retainerless dual plate check valve is made of duplex stainless steel 4A as its body and trim material. Quick Detail Type Check Valve Size 8'' DesignPressure Class 150 Construction Dual Plate Type, Retainerless Connection Lug Type Design & Manufacture API 594 End to End ASME B16.10 Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Duplex Stainless Steel 4A Trim Material Duplex Stainless Steel Media W.O.G. Design Feature 1.Shor face to face dimension 2.Small in size with light weight 3.Swift close of disc with small water hammer 4.Vertically or horizontally installed 5.Smooth flow passway with small flow resistance 6.Long cycle life and high reliability
The 1 inch 800LB female threaded globe valve has plug disc, reduced port and manual handwheel operation. The valve is made of A105N body and trim 5 as per API 602. Quick Detail Type Globe Valve Size 1'' Pressure Class 800 Construction Bolted Bonnet, Reduced Port, Outside Scew & Yoke ConnectionType NPT Female Thread OperationType Handwheel Operated Design Code API 602 End to End Dimension ASME B16.10 Connection ASME B1.20.1 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Forged Steel A105 TrimMaterial 13CR+Stellite Temperature Range -29℃~+427℃ Application Water, Oil, Gas Origin China Product Range 1.Size up to 4 inch 2.Design pressure between 150LB to 2500LB 3.Connection: flange, socket weld, thread 4.Operation: handwheel, gearbox, bare stem, with actuators 5.Body material: carbon steel, stainless steel, alloy steel 6.Trim material: trim 1, 5, 8, 10, 12, 16 and ect. 7.Bolted bonnet, pressure sealed bonnet, welded bonnet, screwed bonnet 8.Reduced bore, full bore Inspection Reports Along with each order, Dervos will provide inspection reports and material test reports free of charge after shipment. All these certificates will let you have a clear picture of inspection process and results. Plus, these reports can be used for traceability.
The Class 1500 4'' cryogenic ball valve is designed with extended stem for low temperature application. The valve is made of LF2 with fully welded body, butt weld end and gearbox operation. Design Feature -Fully welded & forged body -Extended stem or bonnet -Full port design and piggable -Anti blow-out stem -Antistatic function - Automatic cavity relief -Bi-directional seat and DBB design -With stem and seat grease fittings Quick Detail Type Ball Valve Size 4" Pressure ANSI 1500 Construction One-Piece Body, Fully Weld, Extended Stem or Bonnet, Full Port Connection Butt Weld Operation Gearbox Operated Body Material Low Temperature Steel A350 LF2 Design Code API 6D Pressure & Temp ASME B16.34 End to End Dimension ASME B16.10 End Connection ASME B16.25 Inspection API 598 Temperature Range -46℃~+200℃ Media Oil, Water, Gas Related Knowledge What is the difference between full bore and reduced bore ball valve? The internal diameter of a full bore ball valve is the same as the inner diameter of the pipe. The full bore ball valve has little resistance and pressure drop to the flow. Plus, the full bore ball valve is piggable. However, the internal diameter of a reduced port (standard port) ball valve is smaller than the inner pipe size. Flow restriction caused by the reduced port will cause a pressure drop. And sometimes a pig to clean the pipe will get stuck in the reduced port ball valve. Certificates Dervos could provide reports upon clients’ requests, such as ISO 9001, PED CE, EAC, API 607, API 6D, API 6A and etc.
The double offset high performance butterfly valve, with lever operation and lug body, is designed per API 609. The CF8M body and PTFE seat butterfly valve is more durable in serving the application. Quick Detail Type Butterfly Valve Size 3'' Design Pressure 150LB Construction Double Eccnetric, Soft Seat Connection Type Lug Operation Wrench Operated Design Code API 609 Face to Face ASMEB16.10 End Connection ASMEB16.5 Test & Inspection API 598 Body Material Stainless Steel CF8M Temperature Range -29℃~+150℃ Application Water, Oil, Gas Dimension Class 150 DN mm 40 50 65 80 100 125 150 200 250 300 350 400 NPS in 1 1/2 2 2 1/2 3 4 5 6 8 10 12 14 16 L mm 127 127 127 127 152 203.2 203.2 203.2 203.2 in 5 5 5 5 6 8 8 8 8 L1 mm 38.1 46 50.8 48 54 63.5 57 63.5 71.5 81 92 101.5 in 1.5 1.81 2 1.88 2.13 2.5 2.25 2.5 2.81 3.19 3.62 4 H mm 185 190 220 229 239 252 284 307 337 392 435 481 in 7328 7.48 8.7 9 9.4 9.9 11.2 12 13.3 15.4 17.1 19 D(W) mm 160 160 160 160 160 160 160 200 200 250 250 300 in 6.3 6.3 6.3 6.3 6.3 6.3 6.3 7.9 7.9 9.8 9.8 11.8 Weight (Kg) mm 12.5 13.5 17 38 72 105 148 182 230 in 8 9 10 10 11 14.5 34.2 66 98 134 168 200 Related Knowledge What is a high performance butterfly valve? A high performance butterfly valve is often designed with double offset and PTFE seat, to handle everything from general applications to viscous and corrosive liquids; corrosive gases and steam. Compared to concentric resilient seat butterfly valve, the disc of the high performance butterfly valve is arranged and positioned off the center of the pipe bore, which could reduce wear and tear to the valve during operation and increase sealing performance. In conlusion, high performance butterfly valve is applicable for higher pressure and temperature applications. Meanwhile, it has longer cycle life and better sealing ability.
In industrial piping systems, valves are critical components for controlling fluid flow, directly impacting the safety and operational efficiency of the system. In certain specific working conditions, a single valve may not be sufficient to meet process requirements and safety standards. Therefore, double valves (also known as a double valve system) are required to enhance the system's reliability and safety. 1. Typical Working Conditions for Double Valve Installation (1) Control of High-Risk Media When handling toxic, hazardous, flammable, explosive, or corrosive media, leaks in the pipeline system can lead to severe safety incidents. To ensure safety, double valves are typically installed in these cases. The double valve system provides dual sealing, so if one valve fails, the other valve can still effectively prevent media leakage, reducing risk. (2) Isolation of Critical Process Flows In certain critical process flows, absolute isolation is required to prevent media mixing or backflow. In such cases, double valves provide a higher level of isolation. The two valves are typically arranged in series, so when the main valve is closed, the second valve continues to provide isolation protection, ensuring complete separation of media inside and outside the system. (3) Convenience for Maintenance and Repair In conditions requiring frequent maintenance or repair, a double valve configuration enhances the safety and efficiency of maintenance operations. For example, when servicing a section of the pipeline, both valves in the series can be closed first. This allows the intermediate section to be emptied or repaired, ensuring no leakage occurs during maintenance and safeguarding personnel and equipment. (4) High-Pressure or High-Temperature Conditions In high-pressure or high-temperature conditions, a single valve may struggle to withstand extreme process conditions over time, leading to potential seal failures or material degradation. Implementing a double valve system not only provides higher safety redundancy but also helps to distribute pressure or temperature loads, thereby extending the lifespan of the valves. (5) Regulatory or Standards Requirements In certain industries or regions, regulations or standards mandate the use of double valve systems to ensure safety. For example, in natural gas transportation or chemical production, some countries' laws require the installation of double valves to prevent medium leakage and environmental contamination. These regulations are primarily based on risk assessments specific to the industry and aim to ensure the safety and reliability of the system. 2. Advantages of a Double Valve System (1) Double Safety Assurance A double valve system provides dual sealing and isolation functions. Even if one valve fails, the other can maintain the integrity of the system, thereby reducing risks. (2) Enhanced System Reliability By distributing the operational load, a double valve configuration can reduce wear and aging ...
In the valve industry, ball valves are widely used in various fluid control systems due to their simple structure, excellent sealing performance, and ease of operation. Based on the connection method, ball valves can be classified into threaded ball valves and flanged ball valves. 1. Connection Method Threaded Ball Valves: Threaded ball valves connect to pipelines using either internal or external threads and are typically used in small-diameter pipeline systems. The advantage of threaded connections lies in their easy installation, compact design, and minimal space requirements, making them especially suitable for confined spaces. Threaded ball valves are commonly used in low and medium-pressure systems and are ideal for fluid control in residential, commercial buildings, and light industrial equipment. Flanged Ball Valves: Flanged ball valves are connected to pipelines through flanges and are suitable for medium to large-diameter pipelines. Flange connections offer higher strength and stability, allowing them to withstand higher pressures and temperatures. As a result, they are commonly used in heavy industries, chemical processing, oil, natural gas, and other applications involving high pressure, high temperature, or corrosive media. Flange connections also facilitate easy disassembly and maintenance but require more installation space. 2. Sealing Performance Threaded Ball Valves: Threaded ball valves typically use soft sealing materials such as polytetrafluoroethylene (PTFE), offering excellent sealing performance, making them suitable for gases, liquids, and other media. However, under high-pressure and high-temperature conditions, threaded connections may pose a risk of leakage, and their sealing effectiveness is generally slightly weaker than that of flanged ball valves in demanding operating conditions. Flanged Ball Valves: Flanged ball valves typically utilize metal or composite seals, providing more reliable sealing performance, especially under high-pressure, high-temperature, or corrosive media conditions. The sealing of flange connections is more stable, effectively preventing leakage. 3. Installation and Maintenance Threaded Ball Valves: Threaded ball valves are easy to install, requiring only tightening to complete the connection, making them ideal for quick installation in small systems. However, once the threaded connection is secured, it may loosen due to thermal expansion and contraction or vibration of the pipeline, leading to potential leakage risks. During maintenance, if a threaded ball valve needs to be replaced, it may affect the pipeline system and even require reconnection of the entire pipeline. Flanged Ball Valves: Flanged ball valve installation requires the use of flanges, bolts, and gaskets, making the installation process more complex. However, flange connections offer higher robustness and reliability. During maintenance, flanged ball valves can be easily disassembled, replaced, or repaired without affecting the ...
The Bevel Gear Knife Gate Valve is a valve specifically designed for handling complex media containing solid particles, sludge, and similar substances. It is highly regarded in industrial applications for its reliability and efficiency. 1. Structural Characteristics of Bevel Gear Knife Gate Valve The structural design of the bevel gear knife gate valve prioritizes durability and reliability, and is mainly composed of the following components: (1) Valve Body: Typically made from high-strength materials such as cast iron, stainless steel, or other corrosion-resistant alloys to meet the demands of various working conditions. The internal flow path of the valve body is designed to be straight, reducing flow resistance as the medium passes through, which helps to increase flow rate and minimize wear. (2) Knife Gate: The knife gate is the core component of the valve, featuring sharp cutting edges that can effectively cut through and isolate media containing solid particles. The knife gate is typically made from wear-resistant materials to ensure long-term use under high-wear conditions. (3) Bevel Gear Mechanism: This is a key feature that distinguishes the Bevel Gear Knife Gate Valve from other knife gate valves. The bevel gear mechanism converts rotational motion into linear motion through a set of bevel gears, driving the knife gate to move up and down. This design makes the valve easier to operate, especially in large diameter and high-pressure conditions, significantly reducing the difficulty of operation. (4) Sealing Assembly: The sealing performance of the valve directly affects its reliability and service life. The Bevel Gear Knife Gate Valve typically uses elastic materials or metal seals, with the sealing ring fitting tightly with the knife gate to ensure that there is no leakage of the medium when the valve is in the closed position. (5) Stem and Handwheel: The stem is connected to the bevel gear mechanism, and the rotation of the handwheel controls the movement of the bevel gears, thereby controlling the opening and closing of the knife gate. The stem is typically made of anti-corrosive materials and is equipped with a protective sleeve to extend its service life. 2. Working Principle of Bevel Gear Knife Gate Valve The working principle of the Bevel Gear Knife Gate Valve is relatively simple, but its design takes into account the application requirements under various complex operating conditions, ensuring the efficient operation of the valve. (1) Valve Opening: When the valve needs to be opened, the operator rotates the handwheel to drive the bevel gear mechanism. The bevel gear converts the rotational motion of the handwheel into the linear motion of the valve stem, pushing the knife gate upwards. As the knife gate rises, the internal flow path of the valve gradually opens, allowing the medium to pass through smoothly. (2) Valve Closing: When closing the valve, the handwheel is rotated in the opposite direction, and the bevel gear mechanis...
Recently, DERVOS successfully completed a local project in Singapore, providing high-quality globe valve products that ensured efficient operation and safety throughout the project. Background The client for this project was a Singapore-based on-site repair and maintenance company, primarily responsible for the daily maintenance and emergency repairs of industrial facilities. Their core requirement was to provide reliable isolation valves for high-pressure steam systems, ensuring efficient and safe operation under high-pressure and high-temperature conditions. Facing issues such as valve aging and high maintenance costs, the customer urgently needed a solution that could provide long-term stable performance. Product Features To meet the customer's strict requirements for steam medium management, we provided a high-pressure steam isolation globe valve. This valve is specifically designed for steam isolation, featuring excellent high-pressure resistance. It is manufactured using precision machining processes to ensure stable sealing and long-lasting performance, even under high-temperature and high-pressure conditions. The valve not only meets strict international standards but also underwent multiple tests at the project site, demonstrating exceptional performance. Project Results The globe valve was successfully installed and put into operation. The client reported that their high-pressure steam system is running smoothly, with more stable and safer operation. The precise control of the valve not only improved the efficiency of maintenance work but also significantly reduced system failures and safety risks. The client highly praised the performance and service of our products, stating that our solution greatly supported their daily maintenance and emergency response capabilities. The success of this project has not only enhanced the client's maintenance efficiency and system safety but also laid a solid foundation for future cooperation between both parties. We are proud to have been involved in this project and look forward to continuing to provide high-quality fluid control solutions for our clients in the future.
On the evening of June 27, 2024, DERVOS joyously celebrated its 16th anniversary. We not only invited esteemed partners to join us in the celebration, but also meticulously planned a unique journey through time. With the theme "Golden Years, Timeless Classics," we took a nostalgic trip back to the 1990s in Hong Kong. The celebration was filled with a sense of nostalgia and joy, with every detail seemingly transporting us through time to experience the unique charm of that golden era. To match the theme, all partners and colleagues carefully prepared Hong Kong-style outfits, with many colleagues even mimicking classic looks. We specially arranged a fashion show for the occasion. Everyone confidently walked the catwalk, showcasing their Hong Kong-style elegance. Under the flash, everyone exuded a unique charm, as if time had turned back, and the glamour and charm of the 1990s were once again brought to life. In order to let our partners to experience the essence of traditional Chinese culture, we meticulously prepared a "lacquer fan" making activity. By dripping different pigments into the water, the fans spun in the water, creating unique and beautiful patterns that left everyone in awe. Each lacquer fan became a one-of-a-kind piece of art, embodying the creativity and ingenuity of our clients. Our dear partners wrote blessings for Dervos on folding fans and stamped their own exclusive seal, leaving behind cherished memories. The versatile Dervoser added endless joy to the celebration. Sheila and Noisy's jazz dance performance brought the atmosphere to a climax. As the dynamic music played, their passionate performance energized everyone. With the explosive background music, everyone took to the dance floor together, dancing and celebrating this unforgettable moment. That night, we not only reminisced about the glorious past but also looked forward to future prospects. Dervos will continue to uphold the spirit of "Timeless Classics, Everlasting Brilliance," and together with every customer and colleague, write even more magnificent chapters. We thank everyone who has supported and accompanied Dervos, and we look forward to continuing our journey together, creating a better tomorrow.
We are delighted to announce that our company is on the brink of a new beginning - the acquisition of a new office space. This marks a fresh start for our company's development, and we eagerly anticipate crafting a brighter future in this new environment. The selected location enjoys excellent geographic positioning, convenient transportation, and a pleasant environment. The choice of our new office space has been meticulously considered, aiming to provide our employees with a spacious and comfortable working environment while offering ample support and motivation for the company's development. Starting from April 15, 2024, our office address will be changed to: [Unit 3104, Channel Pearl Plaza, No.99 Yilan Road, Siming District, 361008, Xiamen City, Fujian Province, China]。This relocation is not only a natural choice for the continued development of our company, but also a testament to our confidence and aspirations for the future. The utilization of the new premises will further enhance internal collaboration and communication within the company, ignite the creativity and vitality of our team, and elevate our efficiency and service standards. We aim to deliver even higher-quality products and services to our customers and partners as a result. Finally, we would like to express our heartfelt gratitude for your long-standing support and trust in our company. We believe that this new beginning will bring forth fresh hope and opportunities. We will continue to uphold the principle of 'Customer First, Innovative Development', striving for excellence and working towards our long-term corporate goals. Let us join hands and work together to create a brighter future.
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