Top-Entry Ball Valve Product Manual

Top-Entry Ball Valve Product Manual
I. Product Overview
The top-entry ball valve is a high-performance, zero-leakage shut-off valve designed for pipeline applications that supports in-line maintenance; it is designed in strict accordance with API 6D and GB/T 12237 standards. Unlike standard two-piece or three-piece side-entry ball valves, this valve features a one-piece top-entry structure. The valve body has no split-body flange joint, offering superior overall rigidity and resistance to deformation under high pressure, thereby eliminating the risk of leakage at the body joint.
The valve utilizes a trunnion-mounted ball and a dual-seat, bi-directional sealing design, resulting in low operating torque, stable sealing performance, and high resistance to pressure and erosion. Its primary advantage is the ability to maintain or replace internal components in-line and under pressure without dismantling the pipeline, significantly reducing downtime losses. It is widely used in long-distance oil and gas pipelines, petrochemical hydroprocessing, high-temperature/high-pressure power plant applications, and continuous production processes involving flammable or explosive media, making it a premium choice for industrial pipelines requiring long-cycle operation.
II. Structural Principles
The top-entry ball valve features a one-piece body design where internal components—including the ball, seats, stem, and spring assemblies—are installed through the top of the valve; the body has no split line or side flanges. During operation, the stem rotates the ball 90 degrees to achieve full-flow opening or complete shut-off. The dual-seat, bi-directional sealing design withstands high-pressure differentials in both directions, while the body cavity includes a pressure relief function to prevent damage caused by excessive internal pressure buildup.
This rigid, one-piece structure effectively resolves common issues found in standard ball valves—such as high-pressure leakage at the body joint, deformation, and bolt loosening—making it ideal for critical industrial pipelines requiring continuous, long-term operation.
III. Key Structural Features

• Top-entry design for in-line maintenance: Internal components can be removed and installed directly from the top without dismantling the valve or cutting the pipeline. This facilitates convenient maintenance, leaves pipeline and equipment layouts undisturbed, and significantly reduces operation and maintenance costs. 2. One-piece valve body (flangeless design): Integrally cast/forged body with no lateral seams; ensures no deformation under high pressure and zero external leakage, offering safety far superior to standard two-piece ball valves.

2. Trunnion-mounted ball with bidirectional sealing: Ball supported at both top and bottom; offers vibration and erosion resistance and stable operation; ensures zero leakage under bidirectional pressure, suitable for complex differential pressure conditions.
3. Fire-safe and anti-static design: Features built-in anti-static grounding; complies with API 607 ​​fire-safety standards; eliminates risks of static accumulation and media leakage.
4. Anti-blowout stem design: High-pressure self-locking anti-blowout structure prevents stem ejection under high-pressure conditions, ensuring maximum safety.
5. Full-bore or reduced-bore options: Full-bore design offers zero flow resistance and allows for pigging; reduced-bore design offers lower operating torque and better cost-efficiency, catering to diverse process requirements.
6. Modular actuation: Compatible with manual worm gear, pneumatic, electric, and hydraulic actuators; supports remote DCS automation and emergency interlock shut-off. IV. Material Specifications
7. Valve Body: WCB, WC6, WC9, A105, F304, F316L, F22, Duplex Steel
8. Ball: Solid forged stainless steel; surface hardened or Stellite alloy hard-faced for wear resistance
9. Seat: Flexible graphite/stainless steel composite, metal-to-metal hard seal, or special high-pressure seal
10. Stem: High-strength, corrosion-resistant stainless steel (2Cr13, 304, 316L)
11. Packing: Flexible graphite or high-temperature composite packing (high-temperature resistant, low-emission)
    V. Technical Parameters

• Nominal Diameter: DN15–DN1200 (1/2″–48″)

2. Pressure Rating: PN16–PN420; Class 150–Class 2500 (Ultra-high pressure series)
3. Operating Temperature: -46°C–550°C (Subject to material suitability for temperature range)
4. Connection Type: Flange (RF/RTJ), Butt Weld (BW), Socket Weld (SW), Threaded (NPT)
5. Structural Design: Top-entry; trunnion-mounted ball with bidirectional sealing
6. Actuation: Manual, worm gear, pneumatic, electric, hydraulic
7. Leakage Class: API 6D Zero Leakage; Class VI

• Explosion-proof Rating: Ex d IIC T6 (Optional for automated configurations)

8. Applicable Media: Natural gas, petroleum, oil products, steam, water, gases, media with trace particulates
   VI. Applicable Operating Conditions
   ✅ Application Scenarios
9. Critical shut-off points in long-distance oil and gas pipelines, gathering stations, and pressure regulating stations
10. High-temperature, high-pressure, flammable, and explosive processes in petrochemical, coal-chemical, and hydrogenation units
11. High-pressure steam, boiler feedwater, and high-temperature fluid systems in power plants and cogeneration plants

• Industrial pipelines requiring continuous production without frequent shutdowns for pipe disassembly or maintenance
  Operating conditions involving high pressure differentials, high vibration, and the need for stable, zero-leakage operation over the long term
  Transmission and distribution systems requiring pigging or periodic pipeline clearing
  ❌ Inapplicable Operating Conditions
  Highly corrosive acidic or alkaline media (fluorine-lined valves required)
  Conditions involving large quantities of hard, coarse particles and severe erosive wear
  Long-term throttling at small opening angles (this is a shut-off valve; throttling use is not recommended)
  VII. Applicable Standards
  Design and Manufacturing: API 6D, GB/T 12237, ASME B16.34
  Face-to-Face Dimensions: ASME B16.10, GB/T 12221
  Flange/Welding Standards: ASME B16.5, HG 20592
• Pressure Testing: API 598, GB/T 13927
• Fire Safety and Anti-static: API 607
  VIII. Installation and Operating Instructions
  Thoroughly purge the pipeline before installation to remove welding slag and impurities, preventing particles from scratching the valve seat sealing surfaces.
  The valve has no flow direction restriction and can be installed at any angle; ensure flanges are aligned and flush during connection, and avoid forced installation that introduces stress.
  For high-pressure pipelines, pressurization and pipeline warming must be performed gradually during commissioning; avoid sudden high-pressure surges to protect the sealing structure.
  Intended solely for full-open/full-close shut-off service; do not use for long-term throttling at small opening angles to avoid localized erosion damage to internal components.
  Maintenance can be performed without removing the valve body from the pipeline; simply open the top cover to replace internal components such as the seat, ball, and packing.
  For automated valves, periodically calibrate travel limits to prevent over-travel impacts and ensure proper sealing (zero leakage). IX. Summary of Product Advantages
  The top-entry ball valve features a one-piece body design without a central flange, allowing for in-line maintenance. It offers high pressure resistance, zero external leakage, vibration and wear resistance, and a long service life. It effectively resolves common issues associated with standard ball valves, such as leakage at the body joint, cumbersome maintenance, and high downtime costs. Suitable for pipelines involving high temperatures, high pressures, flammable or explosive media, and long-cycle continuous operation, it is the preferred safety shut-off valve for high-end process piping in the oil and gas, petrochemical, and power generation sectors.