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.
Cryogenic valves are intended for very cold applications. The term "cryogenic" refers to temperatures below -50゜C. Valve materials for cryogenic service are required for good ductility. Sealing parts, gaskets and other fittings should also be adapted to these extremely cold conditions on demand. Industries associated with liquefied and compressed natural gas, as well as liquid oxygen, nitrogen or helium, rely on these special valves for the frequent, safe and reliable transport of cryogenic liquids and gases. Special Cleaning Needs & Concerns To Be Stressed The valve manufacturers are required to remove grease and all organic contaminants from the valve with a special solvent, keeping the valve clean. Ultrasonic cleaning is a common choice. Some cleaning gases such as oxygen or chlorine require a very high level of cleanliness to ensure that no organic material or fiber breaks remain on the valve after the cleaning. The cleaned and certified valves are placed in double-sealed polyethylene bags to ensure that the valves are stored in a clean environment until they are installed and used. Operators should perform a thorough inspection when installing cryogenic valves. This is critical to ensure that no lubricants or grease are accidentally introduced into the valve. Some specialty lubricants are available for use in cryogenic environments, and whether or not they are allowed should depend on the specific application requirements. As mentioned earlier, cryogenic valves must avoid staining with fiber breaks. As a general rule, fibers longer than 1/8 inch are not allowed in the valve. In many cases, fibers or breaks of any length are not allowed in the valve. Finally, inspectors should regularly check cryogenic valves and oxygen systems to see if there are internal or external leaks. Internal valve leaks can be prevented by installing the valve properly and a reliable seal design. Cryogenic service requires robust and stable seals to ensure long-lasting and reliable operation of the equipment. Here at Dervos, we’re a leading provider for products inindustrial valve, and we’re certified with the CE, ISO, API and other institutions. We strive to offer the best quality products and customer service through our extensive experience. Contact us today for more information.
The biggest valve Dervos has made ever. This is a DN3750 butterfly valve Dervos made forBombay Municipal Corporation in 2017 which is a government project. The project is special and challenging for its operation for suchalarge size of DN3750. As its torque isup to 989954N.m,it isbetter to be automatically actuated instead of manual operation. But as where it was going to serve is outreach of electrical power, manual operation is the only choice we have. After accurate calculation of the torque, finally we came up with a solution that DN3750 would be operated by a combination of total four gearboxes,which reduced theinput torqueinto incredible117N.m. What an amazing job we did! Andfor this valve, many tests had been carried out, including but not limited to below: We had done DP to the seat ring, UT to flanges, disc and stem, and RT to the welding. Besides, we had done strength tests to disc, adhesive tests to the painting, and IP68 Submergence Test by merging the gearboxes into 3-metre deep water by 72hours. And movement tests were also witnessed, it took about 9 hours from fully open to fully close position. Eventually,The completed valve was made out as about 58 tons weight and 82.4 CBM. Besides the remarkable work we did, we're so proud that its successful put-in-use was even reported by the local newspaper in Mumbai. As you can conclude, Dervos is indeed a professional and reliable valve provider. Contact us today, and get you the quality products and outstanding services Dervos offers.
Pneumatic butterfly valve is a newly developeddurable energy-friendly butterfly valve.This kind of butterfly valve adopts new technologies such astriple eccentric design, elastic sealing,multilevel hard and soft sealing processing, so that the butterfly valves are more than reliable and they can achieve no leakageingas sealing. The pneumatic actuator adopts curved arm conversion structure, which has the characteristics of large output torque, small volume, stable and reliable performance, etc. It can be used with valve positioner. Or used in conjunction with solenoid valves, the device can achieve proportional regulation or switching control and is suitable for media such as gases, solid particles and liquids. Pneumatic butterfly valve can be widely used in paper, petrochemical, chemical, metallurgy, electric power, environmental protection, petroleum, light industry, building automation and automation control system of otherindustrial sectors. Installation and maintenance of pneumatic butterfly valve. 1. When installing the butterfly valve, you should pay attention to the flow direction mark on the valve body to avoid the wrong direction of flow and affect the use. 2. Beforethe use ofthepneumatic butterfly valve, you should flush the pipeline with the valve fully open to avoid the sealing surface being scratched by debris such as welding slag. 3. Generally, bypass piping will be set next to the butterfly valve so that when the butterfly valve is serviced or replaced, the bypass piping can be used to carry out the process as usual. 4. Pneumatic butterfly valve can be installed vertically within 180°。And do not install the pneumatic actuator upside down. 5. If you find that the stuffing box is leaking during use, tighten the gland bolts to solve the problem. Here atDervos, we’re a leading provider for products inindustrial valve, and we’re certified with theCE, ISO, API and other institutions. We strive to offer the best quality products and customer service through our extensive experience. Contact us today for more information—we can’t wait to work with you!
Time keeps moving forward, and we get the last day of 2020. As you may have seen, there are a lot of red elements in the following pictures. In Chinese culture, red stands for fortune and luck. We at Dervos all dress in red this day, wishing 2021 would be a red new year for us. It happened to be a Friday, and we finished work early in the afternoon and started to clean our respective work areas. It is kind of a traditional activity in China, sweeping out the old things and welcoming the coming year with a new look. Posting window decalsis also an indispensable work. Helena, the girl in the right pic below, was finishing the phrase that pretty much says new year new luck. Another girl was showing her amazing handcraft job. Count down 3, 2, 1. Finally we get through the terrible 2020 and step into a brand new 2021. Human society artificially divides time into days, months and years. That demonstrates our wishes to left the bad in the past and embrace the unknown future by the alternation of the old and the the new. Although 2020 is a bumpy year, Dervos maintains a positive mindset for the following 2021 and wishes our customers, in the new year, endless luck and joys.
It was on 11th of December, a rare cloudless afternoon in these consecutive chilly and dreary winterdays. "Now that the weather favoredus, it would be a huge waste to stay at the office, wouldn't it?" Eric Wong, DVS owner, suggested. Then, unexpectedly, we stopped typing, packed staff and went on the way to an extra long footpath that nearly cross the entire downtown. You may see from the image, the walkway spirals up into the woods along the steel frame. As we climb higher, it's getting challenging and scary to walk on the floating way, but the beautiful coastline also emerges on the horizon. As we Chinese always say attracting scenery is always higher. But unfortunately we are within a no-fly area, ourdroneis forbidden to liftoff，thelaugh on the first photo below turned into scowl off the camera. Quite hilarious! As the sun went down the hill, the 3-hour brisk walk finally came to an end till the dawn. The glistening sweaton our brow recorded this an joyful afternoon. Though we didn't finish the whole footpath (because it's way too long), we may regard this end asbeing archived, and some day in the future, perhaps we will have another chance to continue this unfinished trip. 2020 is also approaching an end. Don't forget to say goodbye to this unforgettable year and say hello to the coming unknown 2021. And, definitely, Dervos will be there for you.
Project Name: ECOFUEL INNOVATION PROJECT Year：2017 Introduction: In 2017, we provided a major number ofvalves from regular gate valves to safety relief valves to an environmental project lead byECOFUEL, an emerging Canadian player inclean technology. It is atentative project for sustainable diesel production from solid waste.Dervos is proud to bea part of this fuel innovation actionand offers 136 sets of our reliable and outstanding valves for it. SEGMENT BALL CONTROL VALVE It’s also called V type ball valve, whichhasthebest regulating performance in ball valves. Plus cut-down function between the V-shaped slit and the metal seat, this kind of ball valve is particularly suitable for medium withfibers, solid particles and slurry. KNIFE GATE VALVES As the mediumcontains wooden debris and slurry, knife gate valves are suggestedin this condition for its good cut-down performance. THREE-WAY SPLIT FLOW VALVE Remotely controlled by electric actuators, this valvecan split the flow into twostreams andachieve precise controloverprocess parameters for fluid. SAFETY VALVE Conformed to API520 and API526, thesesafety valves arecustomized according toon-siteworking pressure, temperature and flow capacity for over-pressure protection.
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