The top-entry ball valve is a flow-control device characterized by an integral body design that minimizes potential leak points and facilitates in-line maintenance. Engineered to withstand high pressures, it boasts a wide range of applications spanning various sectors, including municipal water supply, petrochemicals, and power generation. Depending on the nominal diameter, valves with a size of DN100 or smaller utilize a double-bevel seat design; this configuration employs spring-loaded self-compensation to ensure reliable sealing performance under low-to-medium pressure conditions.
Conversely, valves larger than DN100 feature a fixed-ball structure. This valve incorporates Double Block and Bleed (DBB) functionality, fire-safe and anti-static features, and bi-directional sealing capabilities; furthermore, its retractable seat technology significantly enhances ease of maintenance. Additionally, the top-entry design allows for the repair or replacement of internal components simply by removing the bonnet, while the back-seating structure of the bottom-entry stem ensures a reliable seal at the packing gland.
Reduce Maintenance Costs: Top Entry Ball Valves with Easy In-line Repair
Top Entry Ball Valve Specifications
| Category | Technical Requirements / Range |
| Body Material | Carbon Steel, Stainless Steel, Alloy Steel |
| Nominal Size (NPS) | 2" – 60" (DN50 – DN1500) |
| Pressure Rating | Class 150 – 2500 (PN10 – PN420) |
| Operating Temperature | -196°C to +200°C |
| Operation Mode | Lever, Worm Gear, Electric (Actuated), etc. |
Top Entry Ball Valve Reference Standards
| Item | Reference Standards |
| Design & Manufacturing | API 6D / ASME B16.34 |
| Face-to-Face (F-F) | ASME B16.10 (Usually interchangeable with side entry designs) |
| Flange Dimensions | ASME B16.5 (≤24") / ASME B16.47 (≥26") |
| Inspection & Testing | API 6D / API 598 |
| Fire Safe Testing | API 607 / API 6FA |
Top Entry Ball Valve Dimension Table (Class 150 - 600)
Class 150 / 300 / 600 Technical Dimensions (Unit: mm)
| NPS (Inch) | DN (mm) | Class 150 (L) | Class 300 (L) | Class 600 (L) | H (Approx. Height) |
| 2" | 50 | 178 | 216 | 292 | 260 |
| 3" | 80 | 203 | 283 | 356 | 310 |
| 4" | 100 | 229 | 305 | 432 | 385 |
| 6" | 150 | 394 | 403 | 559 | 520 |
| 8" | 200 | 457 | 502 | 660 | 635 |
| 10" | 250 | 533 | 568 | 787 | 760 |
| 12" | 300 | 610 | 648 | 838 | 850 |
| 14" | 350 | 686 | 762 | 889 | 940 |
| 16" | 400 | 762 | 838 | 991 | 1080 |
| 20" | 500 | 914 | 991 | 1194 | 1250 |
| 24" | 600 | 1067 | 1143 | 1397 | 1480 |
High-Pressure Dimension Table (Class 900 - 1500)
| NPS (Inch) | DN (mm) | Class 900 (L-RF) | Class 1500 (L-RF) | Remarks |
| 2" | 50 | 368 | 368 | Forged body recommended for high pressure |
| 3" | 80 | 381 | 470 | |
| 4" | 100 | 457 | 546 | |
| 6" | 150 | 610 | 705 | High torque; gear operator recommended |
| 8" | 200 | 737 | 832 | |
| 10" | 250 | 838 | 991 | |
| 12" | 300 | 965 | 1130 |
Top Entry vs. Side Entry Ball Valves
| Comparison Item | Top Entry Ball Valve | Side Entry Ball Valve |
| Body Construction | One-piece Body (Monolithic). Robust and compact design. | Two-piece or Three-piece Body. Multiple segments bolted together. |
| Maintenance | In-line Maintenance. Repairs can be done through the top without removing the valve from the pipeline. | Off-line Maintenance. Usually requires removal from the pipeline to repair or replace internals. |
| Leakage Risk | Extremely Low. Fewer external joints (leak paths) due to the monolithic body. | Relatively Higher. Segmented design means more body joints, increasing potential leak paths. |
| Manufacturing | High Difficulty. Complex internal machining; requires high-quality casting or forging. | Standard Difficulty. Segmented manufacturing allows for simpler machining and easier assembly. |
| Cost | Higher. Expensive due to manufacturing complexity and larger material volume. | Economical. High production efficiency and lower costs; the most common type in the market. |
| Weight | Heavier. One-piece castings are generally bulkier and heavier. | Lighter. Segmented design allows for more optimized material distribution and weight reduction. |
| Lead Time | Longer. Complex processing and fewer items kept in ready stock. | Shorter. Highly standardized; mass-produced with faster delivery times. |
| Key Applications | High pressure, critical reliability, hard-to-access pipelines (e.g., Subsea, Nuclear). | Standard oil & gas pipelines, moderate pressure, and easily accessible process plants. |
GNEE Top Entry ball valve factory
Request a Technical Quote: API 6D Top Entry Ball Valves with Fast Response
FAQ
What is Top entry cryogenic ball valve
Top-entry cryogenic ball valves are valves specifically designed for cryogenic or ultra-cryo-cryo environments. Their core features are their top-entry structure and cryogenic adaptability, and they are widely used in the transportation systems of cryogenic media such as liquefied natural gas (LNG), liquid oxygen, liquid hydrogen, and ethylene.
What is Top entry trunnion mounted ball valve
The top-mounted trunnion ball valve features a top-entry design, with the ball, sealing ring, and other core components installed through the top of the valve body. This allows for maintenance or seat replacement without disassembling the pipeline. It achieves opening/closing of the pipeline medium or flow regulation by rotating the ball 90°, making it suitable for high-pressure, corrosive, and difficult-to-disassemble pipeline applications (such as buried pipelines).