English

English

Get a Quote
Products

Hot Products

Company News

Ring Out 2020 & Ring In 2021
Ring Out 2020 & Ring In 2021
2020-01-05

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.

Special Cleaning Requirements for Cryogenic Valves
Special Cleaning Requirements for Cryogenic Valves
2020-12-30

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.

Case Review: DERVOS DN3750 BUTTERFLY VALVE FOR INDIAN GOVERNMENT PROJECT
Case Review: DERVOS DN3750 BUTTERFLY VALVE FOR INDIAN GOVERNMENT PROJECT
2020-12-24

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.

SS High Performance Butterfly Valve
加载中...

Double Offset High Performance Butterfly Valve CF8M 3 Inch

  • Payment:

    30% T/T When Order, 70% T/T Before Shipment
  • Product Origin:

    China
  • Color:

    Customization
  • Shipping Port:

    Shanghai China
  • Lead Time:

    30~55 days Ex Works After Order Confirmation
  • Material:

    Stainless Steel Butterfly Valve
  • Method of Operation:

    Lever Butterfly Valve, Manual Butterfly Valve
Inquiry now
Product Detail

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

High Performance Butterfly Valve Manufacturers

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.


Leave A Message

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Related Products
High Performance Butterfly Valve
High Performance Butterfly Valve Lug Type Gear Operated WCB

The high performance butterfly valve is designed with double eccentric or double offset structure. The valve has cast steel WCB body, stainless steel disc and stem along with RPTFE soft seat. Quick Detail Type Butterfly Valve Nominal Size 6 Inch Nominal Pressure Class 150 Structure Double Offset, Double Eccentric, Soft Seat Connection Type Lug Type Operation Gear Operated Design Code API 609 Face to Face ASME B16.10 End Connection ASME 16.5 Test & Inspection API 598 Body Material Cast Steel WCB Trim Material CF8M Disc, 17-4PH Stem, RPTFE Seat Application Water, Oil, Gas Dervos Inspection Report

150LB high performance double offset butterfly valve WAFER
150LB high performance double offset butterfly valve WAFER

The 3 inch 150LB butterfly valve has a double-offset disc design that allows the disc to move off the seat reducing running torque and seat wear. The Wafer type valve can be driven by a gearbox and handwheel or by electric, pneumatic or hydraulic actuator.

Stainless Steel 2 Pieces Type Ball Valve 1-1/2 Inch 800LB
Stainless Steel 2 Pieces Type Ball Valve 1-1/2 Inch 800LB

Made of F316, the floating ball valve is designed under the code of ASME B16.34. The valve consists of two-piece body, floating ball, lever operation, with good reliable sealing performance and small torque.

DIN Single Plate WAFER Check Valve DN80 PN40
DIN Single Plate WAFER Check Valve DN80 PN40

The single-disc check valve, made of CF8, has excellent resistance to corrosion. Designed in accordance with API594, the valve is of a WAFER type.

Straight Pattern Globe Valve Flanged
Cast Steel Globe Valve 12 Inch ANSI 150 WCB Gearbox

The 12 inch 150 LB cast steel globe valve is made of carbon steel WCB body and trim 8, with gearbox, RF flange, BB, and plug disc. Quick Detail Type Globe Valve Size 12'' Pressure Class 150 Construction Bolted Bonnet, Straight Pattern,Plug Disc, OS&Y Connection Flanged Connection Operation GearOperated Design Code BS 1873 Face to Face ASME B16.10 Flange Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material A216 WCB TrimMaterial Trim 8 Temperature Range -29℃~+427℃ Application WOG Origin China Dimension Class 150 NPS in 2 2 1/2 3 4 5 6 8 10 12 DN mm 50 65 80 100 125 150 200 250 300 L-L1 (RF-BW) in 8 8-1/2 9-1/2 11-1/2 14 16 19-1/2 24-1/2 27-1/2 mm 203 216 241 292 256 406 495 622 698 L2 (RTJ) in 8-1/2 9 10 12 14-1/2 16-1/2 20 25 28 mm 216 229 254 305 368 419 508 635 711 L3 mm 102 108 121 146 178 203 248 311 349 H (OPEN) in 14-11/16 15-3/8 16-9/16 20-1/4 21-3/16 22-5/15 24-5/8 28 39 mm 373 390 421 515 538 567 626 712 990 W in 7-7/8 9-7/8 9-7/8 11-13/16 11-13/16 13-3/4 15-3/4 17-3/4 24 mm 200 250 250 300 300 350 400 450 610 WT (kg) RF 22 29 42 64 77 105 154 288 507 BW 19 25 34 49 65 82 131 249 430 Related Knowledge What is the difference between a gate valve and a globe valve? Gate valves and globe valves are two of the most common valves we know. The differences beween them are: 1.Gate valve is used only for on-off function. But the globe valve could be used for shutting off and throttling at the same time.  2.The flow resistance of a globe valve is larger than a gate valve. Likewise, globe valves have more pressure drop than gate valves. 3.The gate valve require larger installation space than a globe valve from the perspective of opening height. 4.The gate valve sealing face suffers more abrasion than a globe valve. 5.The torque value of a globe valve is larger than a gate valve. Quality Checking Quality means everything in Dervos. Quality checking team will do inspections according to standard procedure and provide reports. Our QC team will check valve quality from casting and forging, machining, pressure testing, dimension checking, painting & packing.

3 piece ball valve gear operator A105 4 inch 150LB
3 piece ball valve gear operator A105 4 inch 150LB

The 4 inch 150LB ball valve is a 3-piece one with reduced port, A105 body, F6A stem, ball and seat. The The valve is made as per API6D and is tested under API 598.

10 Inch Fully Welded Ball Valve
10 Inch Fully Welded Ball Valve A105 BW Gearbox

With butt weld end and gearbox, the fully welded ball valve is designed per ASME B16.34. The one piece ball valve has trunnion type ball, antistatic design and full port structure. Quick Detail Type Ball Valve Size 10" Pressure ANSI 300 Construction Trunnion Type, One Piece Body, Full Bore, Fully Welded Connection Butt Weld (BW) Operation Gearbox Body Material Forged Steel A105 Design API 6D Pressure & Temp ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.25 Inspection API 598 Temperature Range -29℃~+125℃ Media W.O.G Related Knowledge What is a fully welded ball valve? What is the benefit and advantage of a fully welded ball valve? A fully welded ball valve is welded after forging without any bolted connection on the body. Compared with flanged ball valve, it features in maximum strength at minimum weight. The design of the valve gives it advantage: -Overall small size and light weight -Fewer leak paths on the body  -High machining precision of ball part -High resistance to external and internal pressure and strength Our Service Dervos customer service is one of our biggest competitive advantages. In Dervos, we provide- 1.Quotation within 24 hours or no later than 3 days This will let you meet the quotation submission deadline and enhance your working efficiency  2.Weekly status report of your order In this way, you will have a clear picture of your order. You do not need to waste time on pushing us for status update 3.An 18-month warranty period A warranty certificate will issued after shipment and you will not have any concern after buying valves. 4.Solutions to complaints within 3 days Quick and responsible actions to complaints will protect your reputation and reduce the financial loss as much as possible.

handwheel operated globe valve
Cast Steel A350 Globe Valve BS1873 BW 8 Inch 300LB

The cast steel globe valve is designed as per BS1873. With Body Bonnet, outside screw and yoke, handwheel, the 8 inch valve, the valve is suitable for common work condition.

6 Inch Dual Check Valve
Wafer Check Valve AL Bronze C95800 Dual Disc 6 Inch

The dual disc wafer check valve is designed as per API 594 and tested per API 598. The bronze non return valve is applicable for sea water. Quick Detail Type Check Valve Size 6'' DesignPressure Class 150 Construction Dual Plate Type, With Retainer Connection Wafer 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 Aluminum Bronze C95800 Trim Material Aluminum Bronze C95800 Media W.O.G. Dervos Inspection after Valve Assembly Valve quality is one of perspectives we care about most. In Dervos, quality control starts from raw material, machining, assembly to pre-shipment inspection. After assembly, the quality checking team will do visual checking, dimension checking, hydraulic testing and air testing. Every order must pass the test per inspection standards. Otherwise our quality checking team will not release the shipment. Inspection Reports Documents can be used to prove how we control valve quality. Along with every order, Dervos will provide clients with an inspection report & a 3.1 mill test report for free. In Dervos inspection report, you will see the actual results of dimension checking and pressure testing along with painting and packing picture. All these info are shown through data and clear pictures.   In 3.1 mill test report, we will show you the chemical composition, mechanical property and heat number for valve body, bonnet, stem, disc and so on.  

DN100 PN16 A41H-16C Spring Loaded Safety Valve RF WCB
DN100 PN16 A41H-16C Spring Loaded Safety Valve RF WCB

The DN100 safety valve, made of WCB and according to GB/T12241-2005, usually work as the over-pressure protection device that work under a steam, air, water or other non-corrosive medium.

MSS SP-81 Manual Lug Type Knife Gate Valve Bi-directional
MSS SP-81 Manual Lug Type Knife Gate Valve Bi-directional

The knife gate is a bi-directional lug type valve designed according to MSS-SP-81 and for industrial service applications. The design of the body and seat assures non-clogging shut off on suspended solids in industries.

Leave a message

    If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Home

Products

about

contact