In applications requiring remote operation or frequent switching, an automatic line blind valve is typically equipped with either electric or hydraulic actuation. The fundamental difference between the two does not lie in whether they can be used, but in their load capacity, response characteristics, environmental adaptability, and system complexity. 1. Electric Actuation (Electric Actuated Line Blind Valve) Electric actuation uses a motor combined with a reduction gearbox to generate torque, driving the blind plate to complete the switching operation. Selection logic: ● If power supply on site is stable → electric actuation should be prioritized ● If remote control or automation integration (DCS/PLC) is required → electric actuation is more straightforward ● If switching frequency is relatively high → electric actuation allows better control of operation speed Key features: ● Simple control: can be directly integrated into control systems, enabling remote operation and position feedback ● Compact structure: no additional hydraulic power unit required ● Lower maintenance requirements: routine checks mainly involve the motor and gearbox Limitations: ● If valve size is large or high thrust is required → electric actuation may have insufficient torque ● If the environment is high-temperature, hazardous (explosive), or dusty → higher electrical protection standards are required (e.g., ATEX) ● If power supply is unstable or frequently interrupted → reliability may decrease Conclusion:If the application involves standard automation requirements and moderate load conditions, electric actuation is generally the preferred solution. 2. Hydraulic Actuation (Hydraulic Actuated Line Blind Valve) Hydraulic actuation generates thrust through hydraulic fluid pressure, making it suitable for high-load applications. Selection logic: ● If valve size is large (e.g., DN300 and above) → hydraulic actuation should be prioritized ● If high thrust is required or resistance/sticking needs to be overcome → hydraulic actuation is more stable ● If a hydraulic system is already available on site → integration cost is lower Key features: ● High thrust output: suitable for heavy-duty blind plates or high-pressure pipelines ● Stable operation: provides continuous output with strong resistance to shock loads ● Good controllability: enables precise control through pressure regulation Limitations: ● If no hydraulic power unit is available on site → system complexity increases ● If ambient temperature variation is significant → hydraulic fluid performance may fluctuate ● If maintenance is insufficient → leakage issues are more likely to occur Conclusion:If the application involves high load and high reliabili...
Recently, DERVOS Valve successfully passed the audit by the American Petroleum Institute (API). The company’s API Spec 6D certification for pipeline valves has been renewed, and the API 600 certification has also been issued. Both certificates are valid through 2029. What is an API6D certificate? API 6D is an internationally recognized standard for valves used in oil and gas pipeline transportation systems. It covers the full process requirements for design, manufacturing, and inspection of products such as ball valves, gate valves, and check valves. The certification typically requires renewal audits every three years. What is an API600 certificate? API 600 is an internationally recognized standard for steel gate valves used in oil and gas refinery applications. It defines requirements for design, materials, manufacturing, inspection, and testing. This certification is generally subject to renewal every three years to maintain validity. According to available information, the audit covered multiple aspects, including quality management system operation, production process control, inspection equipment calibration, and personnel qualifications. During the audit, the API inspection team conducted an on-site review of the entire process at DERVOS Valve, from raw material procurement to final product delivery. A representative from the company’s quality department stated that DERVOS Valve has been continuously improving its standardized system management and has established a quality control system covering the full product lifecycle. Key production processes are supported by standardized work instructions, and inspection records are fully traceable to individual orders. The successful renewal of these certifications demonstrates that DERVOS Valve continues to meet API requirements in product manufacturing and quality assurance within the industrial valve sector. It also supports the company’s qualification to supply products for international projects such as oil and gas pipelines and LNG receiving terminals. The company stated that it will continue to focus on standardized production and process management to ensure the effective operation of its quality management system.
Gate valves and blind valves are both used for pipeline isolation, but they operate on fundamentally different principles.In industrial piping systems, if the objective is true physical isolation (positive isolation), then a blind valve (Blind Valve / Line Blind Valve) is generally more reliable than conventional valves. Instead of relying on seat sealing, it isolates the medium through a solid blind plate, which defines both its application scope and engineering value. The key features of a blind valve can be understood from an engineering perspective as follows: 1. Absolute Physical Isolation If zero leakage is required, then conventional valves (such as gate valves or ball valves) introduce risk, as their performance depends on sealing integrity. Blind valves follow a different logic: ▶ If a solid plate is inserted, then the flow is completely blocked▶ If the blind plate is correctly positioned, then sealing failure is no longer a concern This makes blind valves more suitable for: ● Oil & gas pipeline isolation ● Flammable media (petroleum, LNG, chemicals) ● High temperature steam systems Engineering conclusion:If the project requires verifiable isolation, then a blind valve should be prioritized over sealing-dependent industrial valves. 2. Inline Operation Capability Traditional spade and spacer blinds typically require flange disassembly, which increases operational complexity and introduces safety risks. Blind valves (such as sliding blind valves and swing blind valves) are designed with a different approach: ▶ If frequent switching between operation and maintenance is required, then manual intervention must be minimized▶ If shutdown is not permitted, then switching must be performed under pressurized pipeline conditions (subject to specific design) Therefore: ● Sliding Blind Valve: suitable for limited space and higher automation requirements ● Swing Blind Valve: simple structure, suitable for medium to low switching frequency ● Spectacle Blind Valve: suitable for low-frequency operation and cost-sensitive projects Engineering conclusion:If maintenance is frequent or shutdown is not feasible, then a blind valve with inline operation capability should be prioritized. 3. Mechanical Reliability The reliability of a blind valve does not depend on complex sealing systems, but on: ● Mechanical structural stability ● Material strength (such as A105, WCB, F22, LF2) ● Actuation method (manual, gear-operated, or hydraulic) ▶ If the service conditions involve high temperature, high pressure, or corrosive media, then sealing-based valves are more prone to failure▶ If...
The 150LB ball valve, made of Duplex stainless steel 4A, has a special V port ball. The valve is particularly suitable for media containing fibers, tiny solid particles, slurry and so on.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
4AMethod of Operation:
Pneumatic actuatorQuick Details
|
Type |
Ball Valve |
|
Size |
1-1/2 Inch |
|
Pressure |
150LB |
|
Construction |
V port ball |
|
Connection |
Flange Connection |
|
Operation Mode |
Pneumatic Actuator |
|
Body Material |
ASTM A995 4A |
|
Ball Material |
ASTM A995 4A +Cr |
|
Design code |
API 608 |
|
Pressure & Temp |
API 608；ASME B16.34 |
|
End toEnd Code |
ISA S 75.04-1995 |
|
Inspection |
ISO 5208 |
|
Temperature Range |
-29℃~+120℃ |
|
Medium |
WOG |
General Description
A slotted ball and a V-Port ball with a small angle opening, such as a 15°ball, furnish a linear inherent flow characteristic. medium angle V-Port valves such as a 30°ball furnish a modified equal percentage inherent flow characteristic. Custom ports are also available to meet special control requirements.
Advantages
Flow control
The precision of V-Ball valves offers equal percentage flow characteristics that are generally not associated with a standard ball valve.
Bubble tight shut-off
V-ball valves have the capability of tight shut-off. Thus, additional shut-off valves are not required when using a V-ball valve over globe control valves.
Lower pressure drop
V-Ball valves also have higher flow coefficients (Cv) compared to the same size globe valve which diverts flow and uses a plug to control the flow through the valve. This means that smaller V-Ball sizes can be used to achieve the same flow rate as a larger size globe valve.
Higher shut-sff pressure
The 90°ball rotation allows the V-Ball to shut off at higher working pressures. Thus, allowing lower torque actuators to be used, resulting in cost-saving and higher efficiency for the end-user.
Technical Drawing
Witness Test
Nameplate
Product Application
Dervos valves can be widely used in varieties of industries, such as petrochemical, pipeline, oil & gas, marine, water treatment, power station industries and etc.
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The 12 inch 600LB trunnion mounted ball valve has gearbox, RTJ flange, fire safe design per API 607. The 3 piece ball valve is designed per API 6D. Design Feature & Benefit 1.Small flow resistance means less pressure drop 2.Simple valve structure and light weight 3.Diversified sealing material available, from metal material TCC, satellite, stainless steel to soft material PTFE, Teflon, Nylon, Peek and etc 4.Good performance of both metallic sealing and soft sealing 5.Convenient and swift operation of the valve 6.Easy to maintain due to renewable seat ring 7.When fully opened or closed, the valve sealing face is isolated from medium corrosion. 8.Wide range of application in terms of size and pressure rating Quick Detail Type Ball Valve Size 12" Pressure Class 600 Construction Trunnion Mounted Ball, Three-Piece Type, Side Entry Connection RF Flange Operation Gear Operated Body Material ASTM A105 Design & Manufacture API 6D Pressure & Temp ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.5 Test & Inspection Code API 598 Fire Safe API 607 Temperature Range -29℃~+200℃ Medium Water, Oil and Gas Origin China Material Specification No Part Name Carbon steel to ASTM Stainless Steel to ASTM WCB LCB CF8 CF8M CF3 CF3M 1 Underplate WCB LCB CF8 CF8M CF3 CF3M 2 Underplate Bolt A193 B7 A320 L7 A193 B8 3 Trunnion A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 4 Body A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 5 Bonnet Nut A194 2H A194 4 A194 8 6 Bonnet Bolt A193 B7 A320 L7 A193 B8 7 Cap A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 8 Gasket SS Spiral Wound/graphite or SS Spiral Wound/PTFE 9 Shaft Sleeve SS/graphite 10 Seat Ring RPTFE or POM 11 Ball A105/Ep.Cr or F6 A182 F6 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 12 Seat A105/Ep.Cr or F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 13 Spring 17-17PH(inconel for NACE)Ni-cr Alloy 14 O-Ring Viton 15 Stem A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 16 Sealing Cover A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 17 O-Ring Viton 18 Gear Actuator The material is according to ASTM standard Related Knowledge What is difference between floating and trunnion ball valve? The ball part of floating ball valve is movable. Under the pressure of medium, the ball has a certain displacement and presses on the sealing surface of outlet end to ensure its tight sealing. The floating structure is suitable for ball valve with small size and low & medium pressure rating. The ball part of trunnion mounted ball valve is fixed. Under the medium pressure, the floating seat will move towards the ball to ensure the sealing. The trunnion mounted ball valve is often with larger size and higher pressure.
The Class 300 flanged ball valve has cast steel WCB body, stainless steel ball, stem, seat ring along with Devlon seat insert. We also supply more types of trunnion mounted ball valve, accept customized. Design Feature 1.Firesafe design as per API 607 2.With sealant injection for self lubricating 3.With antistatic design 4.With anti-blowout stem 5.With vent and drain port 6.Full bore design 7.Three-piece type and trunnion ball 8.Gear operated for easy operation Quick Detail Type Ball Valve Size 24" Pressure ANSI 300 Construction Trunnion Type Ball, 3-Piece Body, Side Entry, Full Bore Connection Flange Connection Operation Gearbox Operation Body Material ASTM A216 WCB Design Code API 6D Pressure & Temp Code ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.5 Test & Inspection Code API 598, API 6D Fire Safe API 607 Temperature Range -29℃~+200℃ Medium WOG Origin China Dimension CLASS 300 DN mm 50 65 80 100 150 200 250 300 350 400 450 500 600 700 NPS in 2 2.5 3 4 6 8 10 12 14 16 18 20 24 28 L (RF) mm 216 241 283 305 403 502 568 648 762 838 914 991 1143 1346 in 8.5 9.5 11.13 12 15.88 19.75 22.38 25.5 30 33 36 39 45 53 L1 (BW) mm 216 241 283 305 457 521 559 635 762 838 914 991 1143 1346 in 8.5 9.5 11.13 12 18 20.5 22 25 30 33 36 39 45 53 L2 (RTJ) mm 232 257 298 321 419 518 584 664 778 854 930 1010 1165 1372 in 9.13 10.13 11.75 12.63 16.5 20.38 23 26.13 30.63 33.63 36.63 39.75 45.89 54 H mm 153 165 195 213 272 342 495 580 625 720 790 840 1050 1150 in 6.02 6.5 7.68 8.39 10.7 13.5 19.5 22.85 24.6 28.35 31 33.1 41.34 45.3 Do(W) mm 400 400 600 850 1100 1500 *350 *350 *600 *600 *800 *800 *800 *800 in 15.74 15.74 23.62 33.46 43.3 59 13.8 13.8 23.6 23.6 31.5 31.5 31.5 31.5 RF(Kg) 18 27 47 80 118 200 365 530 740 1030 1320 1540 2600 3900 BW(Kg) 14 2 38 65 105 185 342 503 713 1000 1285 1498 2540 3825 *Worm Gear or Electric Actuator Operated Dervos Quality Checking System In Dervos, we control quality throughout the whole manufacturing process. Casting inspection: Though casting inspection, we can find out the problem of raw material, such as shoddy casting, unqualified wall thickness, chemical composition and so on, which ensure that you will not be cheated. Machining Inspection: On the one hand, we could ensure machining accuracy through this process. On the other hand, we can find out machining mistake as early as possible, to win more time for repairing and remaking Final Inspection: Final inspection activities include document and QC record review, visual examination, dimension check, pressure test, painting and packing check. You don’t need to come and inspect in person and all the documents could be provided as proof.
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
API 6D ball valve is designed with trunnion mounted ball and full bore structure. The flanged ball valve has 300LB design pressure and 8 inch nominal size with gearbox operation mode, conforming to NACE MR0175 requirement. Quick Detail Type Ball Valve Size 8” Pressure 300LB Construction Two-Piece Body, Full Bore, Trunnion Ball Connection RF Flange Operation Mode Gearbox Body Material A216 WCB Trim Material Ball/Stem F6a, Seat RPTFE 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 Dervos Packing Painting Test & Report Pressure Testing & Dimension Checking
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.
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.
China Carbon Steel Ball Valve Provider Offers 3 Piece Position Type Ball Valve, ASTM A105N, Class 800, 1 Inch, Free Floating Ball, API 608, BS 5351.
DN150 PN16 Ball Valve is made according to ISO 17292 standard. The fire resistance test meets the requirements of API 607 standard. The valve body is made of ASTM A105. Its operation mode is turbine operation. The trunnion mounted ball valve with a structural length of 400mm has the structural characteristics of full bore.
8" 2500LB ball valve is made according to API 6D standard. The valve body is made of F51. It has the structural characteristics of trunnion mounted ball, full bore. It also has the design of anti-fire, anti-static and anti-flying valve stem. In addition, it also meets NACE MR0175 requirements.
2" 1500LB ball valve is made according to API 6D standard. It also complies with the design standard of NACE MR0175. The valve body is made of ASTM-A105. It has the structural characteristics of full flow and trunnion mounted ball. It has RTJ connection mode and gearbox operation mode.
2" CL150 V-ball valve is made according to API 608 standard. The valve body is made of ASTM A995 4A. It has the structural characteristics of V type. It has RF connection mode, and its operation mode is polished rod torque.
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