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.
The high-pressure
Class 4500 gate valve is designed with PSB and SW end connection. Made of CS
A105, the 2 inch gate valve follows the inspection standard API 598 and design
standard API 602.
Dervos could offer customizing service by providing clients with valves in
different sizes, materials, standards, design pressure, structure, operation
type and connection type.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
CS A105Product Description
|
Type |
Gate Valve |
|
Size |
2" |
|
PN |
Class 4500 |
|
Construction |
Pressure Seal Bonnet, OS&Y |
|
Connection |
SW |
|
Operation |
Handwheel |
|
Body |
CS A105 |
|
Design Standared |
API 602 |
|
Face to Face Code |
ANSI B16.10 |
|
Pressure & Temp |
ANSI B16.34 |
|
Test & Inspection |
API 598 |
|
Temp. |
-29℃ ~ +425℃ |
|
Medium |
Water, Oil and Gas |
|
Origin |
China |
Material
Product Range
Our products include different kind of valves as below. Or you want to know more detail, just contact us.
Quality Inspection
Dervos strictly controls product quality. In addition to the final round of inspections, our quality inspection team also checks valve quality through casting or forging, machining, pressure testing, dimensional inspection, painting and packaging.
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.
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
8" 1500LB gate valve is made according to ASME B16.34 standard. The valve body is made of WCC. It has the structural characteristics of pressure self sealing, elastic gate and structural length of 711mm. The working principle of self sealing valve is mainly to use wedge sealing surface to seal under pressure.
10'' 1500LB gate valve is made according to ASME B16.34 standard. The valve body is made of WCC. It has the structural characteristics of pressure self sealing, rising stem, elastic wedge and structural length of 864mm. Both ends of the valve stem are threaded. It has BW connection type.
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.
Differing 1/4 inch to 3 inch, this gate valve is made of B62 bronze according to API602. No matter what pressure rating, thread design or size you require, Dervos has a large selection of valves to meet your needs.
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 PTFE fully lined butterfly valve is made of cast iron body and with gearbox operation. The 14 inch flanged valve has concentric type structure. Quick Detail Type Butterfly Valve Size 14'' Design Pressure 150LB Construction Concentric Type, PTFE Lined Connection Type Double Flanged Operation Gear Operated Design Code API 609 Face to Face ASMEB16.10 End Connection ASMEB16.5 Test & Inspection API 598 Body Material Cast Iron GGG40 Temperature Range -15℃~+150℃ Application Water, Oil, Gas Related Knowledge What is the advantage of fully lined butterfly valve? The main advantage of lined butterfly valve is that it can handle abrasive and corrosive application at a relatively lower cost. The PTFE or PFA flexible seat provide a zero leakage sealing performance. Plus, the lined material PTFE has strong corrosion resistance, stable performance, low friction coefficient, which make the lined butterfly valve has a long service life. How does Dervos control quality of raw material? Raw material plays an important role in product quality. Likewise, casting and forging affect valve quality a lot. That is why Dervos pay a lot of attention to foundries. We have an approval list of foundries and classify them by certificates, scale, process and materials. To meet different requirements from customers, we could even appoint suitable foundries for our customers.
DN25 PN40 ball valve is made according to ISO17292 standard. The valve body is made of ASTM A105. It has the structural characteristics of floating ball and full bore. Its connection mode is EN 1092-1 B1. And it has lever operation mode.
Line blind valve is a kind of gate valve that cuts off gas medium manually, electrically or pneumatically or hydraulically. It is generally divided into electric blind valve, hydraulic blind valve, closed plug valve and electric open blind valve.
8" 150LB cast steel globe valve is made according to BS 1873 standard. The valve body is made of ASTM A216 WCB+STL. It has the structural characteristics of straight through, rising stem, plug valve disc. Its connection mode is RF. And it has hand wheel operation mode.
The 1 inch 1500LB y strainer is made of forged steel body and stainless steel 304 as the screen material. The high pressure y strainer with sw end is designed as per ASME B16.34. Design Feature 1.Forged Steel Body 2.Stainless Steel Screen 3.Customized Mesh for Screen 4.Installed Horizontally or Vertically 5.Ability to handle higher pressure Quick Detail Type Strainer Size 1'' DesignPressure 1500LB Construction Y Type Strainer, Bolted Bonnet ConnectionType SW ( Socket Weld) Design Code ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.11 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material ASME A105 ScreenMaterial SS304 TemperatureRange -29℃~+425℃ Application Water, Oil, Gas Related Knowledge What is the difference between Y strainer and basket strainer? Both y strainer and basket strainer take their name from their configurations. There are four differences between them. -First, y strainer can be installed either horizontally or vertically. But in most cases, basket strainer could only be in horizonal position. -Second, y strainer could handle higher pressure rating than basket type. -Third, for the ability to screen particulate, basket strainers are better than y strainers. -Lastly, basket strainer is easier to be cleaned than the y type strainer. In conlusion, Y-strainers are applicable for high-pressure pipelines with a low concentration of particles & solids and less cleaning needs. Vice versa for basket type strainer.
The API 6D ball valve is designed with trunnion mounted ball and full bore structure. The flanged ball valve has 600LB design pressure and 10 inch nominal size with gearbox operation mode, conforming to NACE MR0175 requirement.
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