Neles D Series trunnion-mounted ball valves are available in full-bore and reduced-bore designs, featuring a two-piece split body and flanged connections. The valves support pressure classes up to EN PN 10-100 and ASME 150-600, operate at extreme temperatures from -200 to +600 °C, and are available with metal or soft seats, Q-trim noise- and cavitation-reducing trim, and Neles B1 Series actuators. The valves meet SIL 3 functional safety requirements and are suitable for high differential-pressure liquid control, high-noise gas regulation, low- or high-temperature process isolation, and emergency shutdown circuits in industrial safety interlock systems.
Neles D Series ball valve
Neles
Neles D Series Trunnion-Mounted Ball Valves (Full Bore/Reduced Bore)
High-capacity on/off and control ball valves with metal-seated options
- Category
- Ball Valves
- Size range
- D1F: DN50 – 700 (2” – 28”); D2: DN700 – 900 (28” – 36”)
- Pressure classes
- EN PN 10-100, ASME 150-600
Specifications
- Valve construction
- Flanged, trunnion-mounted, full-bore and reduced-bore ball valve; two-piece split body
- Size range
- D1F: DN50 – 700 (2” – 28”); D2: DN700 – 900 (28” – 36”)
- Pressure classes
- EN PN 10-100, ASME 150-600
- Operating temperature range
- -200 to +600 °C / -330 to +1110 °F
- Face-to-face standard
- ASME B 16.10
- Seat types
- Metal-to-metal seats, with soft seats available as an option
- Mounting method
- Trunnion-mounted
- Actuator compatibility
- Neles B1 Series actuators
- Control trim
- Neles Q-trim ball valve noise-reducing trim with cavitation protection
- Gas noise-reducing trim
- Neles Q2-trim option
- Low-emission standard
- ISO 15848
- Fire-safe certification
- API 607
- Functional safety level
- SIL 3
- Sealing options
- Metal-to-metal sealing or soft sealing
- Flow passage
- Full-bore or reduced-bore
Application scenarios
High differential-pressure liquid control loops
For flow or pressure control of high-flow liquid media. The valve can be configured with Neles Q-trim ball valve noise-reducing trim with cavitation protection, making it suitable for control conditions involving high differential pressure and cavitation risk.
High-noise gas control applications
For flow or pressure regulation of gas media. The valve can be fitted with Neles Q2-trim gas noise-reducing trim to improve attenuation of noise generated by gas flow.
Industrial plant safety interlock shutdown loops
For emergency shutdown or safety isolation in critical process operations. The valve can be equipped with Neles B1 Series actuators and VG9000 intelligent safety solenoid valves. Product documentation supports SIL 3 functional safety applications and demanding safety valve service.
Low-temperature process media isolation and control
For conveying, isolating or controlling low-temperature process media. The operating temperature range extends down to -200 °C, allowing use in low-temperature applications confirmed to meet the applicable temperature requirements.
High-temperature process media isolation and control
For shutting off or controlling high-temperature process media. The operating temperature range extends up to +600 °C, and metal-to-metal seat options are available for high-temperature applications that meet the specified temperature and pressure-class requirements.
Selection points
Trunnion mounting and two-piece split body
The D Series features trunnion mounting and a two-piece split body, covering large nominal sizes from DN50 to DN900 for high-flow isolation and control applications.
Wide operating temperature range
The operating temperature range is -200 to +600 °C, covering cryogenic through high-temperature service conditions.
Q-trim and Q2-trim noise-reducing trim options
Control applications can be configured with Neles Q-trim ball valve noise-reducing trim with cavitation protection. For gas applications, Neles Q2-trim can be selected to improve gas noise attenuation.
Metal and soft seat options
The D Series is based on metal-to-metal seats and also offers soft seat options, allowing selection of metal or soft sealing according to application requirements.
ISO 15848 low emissions
Product documentation states that the series meets ISO 15848 low-emission requirements, making it suitable for applications requiring fugitive-emission control.
API 607 and SIL 3 safety features
Product documentation states that the series provides API 607 fire-safe certification and SIL 3 functional safety capability.
Installation notes
Actuator and safety accessory compatibility and stroke verification
When configuring Neles B1 Series actuators and VG9000 intelligent safety solenoid valves, verify that the accessories are compatible with the D Series ball valve assembly. Check valve operation and the safety position to confirm compliance with the requirements and ensure proper assembly operation.
FAQ
Which high-risk isolation and control applications are suitable for Neles D Series ball valves?
Neles D Series valves are suitable for high-flow isolation and control applications requiring reliability and availability, including ESD/ESV, HIPPS, blowdown and venting, high-cycle switching, low-noise service, cavitation protection, and low- and high-temperature applications. Applications include chemical and petrochemical processing, oil and gas production, steam, natural gas, LNG, LPG, power generation, molecular sieve systems and solids handling.
How does the Neles D Series provide reliable sealing and safe operation?
The series features robust heavy-duty trunnion bearings, a Stemball design with a backlash-free connection between the stem and ball, and a blowout-proof stem design. The seat can be selected as metal-to-metal or soft according to operating conditions. The series also provides ISO 15848 low-emission compliance, API 607 fire-safe certification and SIL3 certification. The specific configuration must be confirmed according to the actual model and application conditions.
How should Neles Q-trim or Q2-trim be selected for gas media control?
For applications requiring control valve regulation performance while addressing cavitation and noise concerns, Neles Q-trim technology may be considered. For noise attenuation in gas applications, the Neles Q2-trim option can be selected. The noise-reducing trim features a self-flushing design. The specific trim configuration must be confirmed based on the medium, differential pressure, flow rate and noise-control requirements.
How should the Neles D Series size, pressure class and temperature range be selected?
The D1F size range is DN50–700 (2–28 inches), while D2 covers DN700–900 (28–36 inches). The valves are available in full-bore and reduced-bore designs with flanged connections and trunnion mounting. Pressure classes range from EN PN 10–100 and ASME Class 150–600, with an operating temperature range of -200 to +600 °C. Selection should match the pipe size, connection standard, pressure class, medium temperature and flow requirements.
Which design features should be given particular attention when maintaining Neles D Series ball valves?
The series features a two-piece split body and a maintenance-friendly design to support service work. During maintenance, pay particular attention to the seat type, the condition of the stem-to-ball connection, actuator configuration and control trim suitability. For high-cycle, low-temperature, high-temperature, solids-containing media or demanding safety applications, develop the maintenance plan according to actual operating conditions.