Based on publicly available industry data, company websites, and authoritative rankings in 2025, this article selects ten Chinese valve manufacturers that are representative in terms of technology, production capacity, qualifications, and market performance. The ranking emphasizes overall corporate capability and market influence, aiming to provide a reference for procurement and engineering selection. Suzhou Neway Valve Co., Ltd. (Brand: NEWAY) Neway is one of the few domestic valve manufacturers capable of serving high-end applications such as deep-sea, LNG, and nuclear power. The company possesses comprehensive technology and international certifications, with outstanding production capacity and project support capabilities. It holds a significant share in large-scale projects and export markets, making it a representative of leading domestic valve enterprises. DERVOS VALVE (Brand: DERVOS VALVE) DERVOSVALVE' s product line covers a full range of valves, including ball valves, butterfly valves, gate valves, globe valves, and check valves. The company holds comprehensive technology and international certifications, ensuring its products meet the requirements of various operating conditions and markets. With in-house manufacturing capabilities and first-class supply strength, DERVOS VALVE can offer customers excellent delivery speed and consistent quality assurance. The company supports orders starting from a single unit (MOQ≧1) and provides one-stop services from inquiry and quality inspection to final delivery. Lianggu Valve Group Co., Ltd. (Brand: Lianggu) Lianggu specializes in forging, casting, and CNC machining, offering a comprehensive range of valve specifications across multiple manufacturing sites and its own casting and forging facilities. The company is well-suited for mid-to-high-end engineering projects and maintains stable clients and standardized capabilities in sectors such as nuclear power and petrochemicals. CNNC Suzhou Valve Technology & Industrial Co., Ltd. (Brand: CNNC Su Valve) CNNC Su Valve originates from the state-owned system and has long been responsible for supplying valves for nuclear power and major engineering projects. Its qualifications and testing capabilities are among the industry' s leading standards. The company possesses irreplaceable engineering experience in high-integrity and specialty valves. Suzhou Dawson Drilling & Production Equipment Co., Ltd. Founded in 2006, the company primarily manufactures oil and gas drilling and production equipment as well as valve products. Its products are widely used in the energy sector, including oil and natural gas. With strong R&D and manufacturing capabilities, Dawson maintains a stable position in both the drilling equipment and industrial valve markets. Zhejiang KCM Valve Co., Ltd. (KCM Valve) KCM Valve has long focused on the research and manufacturing of marine valves. Its products ...
Have you ever encountered repeated fluid shocks, frequent valve cycling, or excessive noise in your pipeline system? If a check valve is not selected properly, issues such as leakage, valve damage, or fluid hammer can occur. While check valves are effective at preventing backflow, they are not suitable for all operating conditions. The following cases require special attention: High-frequency opening and closing conditions Check valves rely on the disc or flap to close automatically. If the medium in the pipeline flows frequently or the valve cycles too often, impact, water hammer, or vibration may occur, shortening the valve’s service life. In such cases, consider using spring-loaded or damped check valves, or even other valve types better suited to the application. High-viscosity fluids or media with solid particles Thick fluids or those containing solids can prevent the valve disc from closing fully, increasing the risk of leakage. For slurries, mud, or liquids with a high concentration of particles, specialized valves or additional filtration equipment should be used instead. High-pressure systems In high-pressure applications, the valve disc is subject to strong impacts and repeated collisions, which can cause wear on the sealing surfaces or structural damage. For such environments, more robust backflow prevention solutions should be considered. Systems Sensitive to Pressure or Flow Variations When a check valve closes, it may cause pressure loss or flow fluctuations. If the system is highly sensitive to such variations, careful evaluation of the valve type and installation location is required to avoid negative impacts on overall pipeline performance. Conclusion A check valve is an essential device for preventing backflow, but it should be used with caution in certain operating conditions such as high-frequency cycling, high-viscosity fluids, high-pressure systems, or applications sensitive to flow variations. By properly assessing the pipeline operating conditions and fluid characteristics, you can ensure the check valve performs at its best, extends service life, and reduces maintenance costs.
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.
1/2”500PSI Floating Solid Ball Valve is made according to BS5351 standard. The valve body is made of ASTM A105. It has the structural characteristics of Full Port, Two-piece, Floating Solid Ball, Fire-safe & Anti-static, Blow-out Proof Stem. Its connection mode is NPT. And it has Lever Handle operation mode.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
chinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
ASTM A105
|
Type |
Floating Ball Valve |
|
Size |
1/2” |
|
Pressure |
500PSI |
|
Connection |
NPT |
|
Operation |
Lever Handle |
|
Body Material |
ASTM A105 |
|
Design Norm |
BS5351 |
|
Screw ends |
ANSIB1.12.1 |
|
Test & Inspection Code |
API 598 |
|
Temperature |
-20 ~ 90°C |
|
Applicable Medium |
Water, Oil and Steam |
1. Manufactured from A105 forged steel, delivering high pressure resistance up to 500 PSI.
2. Features a floating solid ball with NPT connection and lever handle for smooth operation and secure sealing.
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The 1 inch floating type ball valve is made of aluminum bronze C95800. The reduced bore ball valve has lever operation, RF flange, two piece type body. Quick Detail Type Ball Valve Size 1" Pressure ANSI 150 Construction Floating Ball, 2-Piece Body, Side Entry, Reduced Bore Connection Flanged End Operation Lever Operation Body Material Aluminum Bronze ASTM B148 C95800 Media W.O.G Available Modifications for Ball Valve -Nominal Pressure -Valve Size -Reduced Port & Full Port -Material of Body, Ball, Stem, Seat, Packing, Bolt and Nut -Valve Operation (Lever, Gearbox, Pneumatic or Hydraulic or Electric Actuator) -End Connection Type -Available Extended Stem -Customized Coating & Packaging -Modifications of Drain Port Dervos Packaging Good packing means good first impression. Just imagine how do you feel differently when seeing two boxes below? And you will know the reason why in Dervos we value packaging so much. In Dervos, we make sure- 1.Every valve is clean and dry. What do we do? -Clean the valve before packing -Add anti-rust oil -Add flange cover 2.No damage to valves in delivery. How do we achieve this? -Fix the valve with iron wire -Separate the valve with soft material -Layer the valve with plywood 3.Strong box and clear shipping mark
The 2 piece type floating ball valve has full port, fire safe design, anti blowout stem, ANSI 150 flange and lever operation. The carbon steel ball valve is designed with A216 WCB body, F316 stem and ball, PTFE soft seat. Quick Detail Type Ball Valve Size 4" Pressure 150 LB Construction Floating Type Ball, Two Piece Body, Full Bore Connection Raised Face Flange End Operation Wrench Operation Body Material Cast Steel WCB Trim Material SS316 &PTFE Design Standard API 6D Pressure & Temp Code ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.5 Inspection Code API 6D Temperature Range -29℃~+125℃ Media Water, oil and gas Material & Dimension No Part Name Carbon steel to ASTM Stainless Steel to ASTM WCB LCB CF8 CF8M CF3 CF3M 1 Body A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 2 Bonnet nut A194 2H A194 4 A194 8 3 Bonnet bolt A193 B7 A320 L7 A193 B8 4 Cap A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 5 Gasket SS Spiral Wound/graphite or SS Spiral Wound/PTFE 6 Ball A105/Ep.Cr or F6 A182 F6 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 7 Seat Ring RPTFE or POM 8 Small spring Stainless Steel 9 Small ball A182 F304 A182 F316L 10 Stem A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 11 Stem Seat PTFE 12 Stem Packing PTFE or Graphite 13 Gland A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 14 Gland Bolt A193 B7 A193 B8 15 Galnd Flange A216 WCB A351 CF8 16 Positioning Plate Steel 17 Wrentch A216 WCB The material is according to ASTM standard CLASS 150 DN mm 15 20 25 40 50 65 80 100 150 200 250 NPS in 0.5 0.75 1 1.5 2 2.5 3 4 6 8 10 L (RF) mm 108 117 127 165 178 191 203 229 394 457 533 in 4.25 4.6 5 6.5 7 7.5 8 9 15.5 18 21 L1 (BW) mm 140 152 165 190 216 241 283 305 457 521 559 in 5.5 6 6.5 7.48 8.5 9.5 11.13 12 18 20.5 22 L2 (RTJ) mm 119 129.7 139.7 178 191 203 216 241 406 470 546 in 4.69 5.11 5.5 6.9 7.5 8 8.5 9.5 16 18.5 21.5 H mm 66 74 87 105 132 152 182 215 250 285 495 in 2.6 2.9 3.48 4.2 5.28 6.08 7.28 8.6 10 11.4 19.5 Do(W) mm 130 130 160 230 400 400 600 850 1100 1500 *350 in 5.1 5.11 6.3 9 15.74 15.74 23.62 33.46 43.3 59 13.8 RF(Kg) 2.3 3 4.5 7 15 20 25 40 97 160 240 BW(Kg) 2.0 2.5 3.8 5.8 12 17 21 36 92.8 154 227 *Worm Gear or Electric actuator operated Special Tests & Inspections In addition to regular hydraulic testing and air testing, Dervos could also do specials test as per clients’ requests, such as PT test, RT test, UT test, cryogenic test, low leakage test, fire proof test, and hardness test and so on.
DIN Ball Valve Full Pore RF Floaing Ball Fire Proof anti-static Lever WCB Body A105+ENP Ball 17-4PH Stem F304+Ni55 Seat X750 Spring Welding Flange Heating Jacket DN100 PN16 Quick Detail Type Ball Valve Size DN100 Design Pressure PN16 Construction Floating ball valve ConnectionType Raised Face Flange OperationType Lever Body Material WCB BallMaterial A105+Ni60 Stem Material 17-4PH SeatMaterial F304+Ni55 Design Code EN12516-1 Face to Face Dimension EN558-1 End Connection EN1092-1 B1 Pressure & Temp EN12266 Medium Water, Oil and Gas Origin China
API 6D ball valve is designed with an extended stem for special use, like underground ball valve or low temperature application. The length of the extended stem can be customized as per client's request. Quick Detail Type Ball Valve Size 2 Inch Pressure Class 600 Construction Split Body, Side Entry, Floating Type, Firesafe Design, Antistatic System, Anti-Blowout Stem, Extended Bonnet Connection RF Flange Operation Mode Lever Body Material A105N Trim Material SS304 Ball and Stem, RPTFE Seat Design & Manufacture API 6D Pressure & Temp Code ASME B16.34 End to End ASME B16.10 End Connection ASME B16.5 Inspection API 6D, API 598 Temperature Range -29℃~+200℃ Medium Oil, Water, Gas QC Process in Dervos Casting inspection： We can find out the raw material’s problem, such as shoddy casting, unqualified wall thickness, chemical composition and so on, which ensure that you will not be cheated. Machining Inspection: -Ensure machining accuracy -Find out machining mistake as early as possible, to win more time for repairing, remaking Final Inspection: -Final inspection activities include document and QC record review, visual examination, dimension check, pressure test, painting and packing check -Save time and cost: you don’t need to come and inspect in person and all the documents could be provided as proof. Inspection report will be provided free of charge including: -EN 10204 3.1 Mill Test Certificate -Inspection Report, showing the whole inspection process
DN25 PN100 Forged Steel A105 NPT Connection Way 2 Pieces Construction Full Pore Lever Operation Floating Ball Fire Safety Body and Bonnet A105 Ball a182 F304 Seat Ring PTFE Stem A182 F304 Stem O Ring Viton Packing Graphite Gland Stainless Steel Design and Manufacture ASME B16.34 Face to Face Design Manufacture Standard Manufacture Standard Screw and Dimension ANSI B1.20.1 Inspection and Test API598 Fire Safety Design API 607 Quick Detail Type Ball Valve Size DN25 Pressure PN100 Construction 2 Pieces Connection NPT Operation Mode Lever Body Material A105 Cover A105 Design & Manufacture ASME B16.34 End to End ASME B16.10 End Connection ANSI B1.20.1 Inspection API 598 Temperature Range -29℃~+538℃ Medium Oil, Water, Gas
The 2-piece floating ball valve, made in accordance with API 6A, has a design of reduced bore, fire safe design, anti blowout stem. With the RPTFE seat and PTFE O ring, the 4 inch WCB valve is certificate to serve you.
This ball valve, designed as per ASME B16.34, features two different connection ways--one side for RF and the other side NPT. The valve with floating ball, PTFE seat, SCS13 body and other features has an excellent sealing performance.
The forged steel ball valve is made of A105 body and 17-4PH trim with RTJ flange end and lever operation. This floating ball valve features reliable sealing performance and easy operation.
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.
DN25 PN16 Forged Steel Floating Ball Valve is made according to ISO17292 standard. The valve body is made of ASTM-A105. It has the structural characteristics of Split Body, Floating Ball, Full Bore, Fire-safe, Anti-static, Blow-out Proof Stem. Its connection mode is RF . And it has hand wheel operation mode.
Made of CF8M, the 2 PC valve is designed according to ASME B16.34. Mixed with 15 percent of fibreglass, the RPTFE seat of the valve is more eligible to bear high temperature and high corrosive working condition.
China Flanged End Ball Valve Producer,Dervos Offers Flanged End Ball Valve, ASTM A350 LF6, Class 600, 1/2 Inch, Two Piece, Forging, API 608, BS 5351, ASME B16.34.
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