Neles AU Series top-guided angle valves are flow control valves designed specifically for high-pressure-drop, high-velocity flashing services. The series features a one-piece angle valve body and an unbalanced design, with nominal sizes up to DN 15-150. Flanged or welded connections are available, as are optional Tendril trims for noise and cavitation control. The valves are SIL 3 certified and cover operating temperatures from -200 to +593 °C, making them suitable for space-constrained piping, LNG cryogenic media, and severe industrial control loops involving flashing.
Neles top-guided angle valve, AU Series
Neles
Neles AU Series Top-Guided Angle Valves: Flow Control in Flashing Service
Top-guided angle valves for flashing service, with optional multi-hole trim.
- Category
- Globe Valves
- Nominal size range
- DN 15 - 150 / 1/2" - 6"
- Pressure rating
- ASME 150 – 2500 / PN10 – 320
Specifications
- Valve body design
- Angle body, one-piece construction
- Trim design
- Unbalanced, top-guided
- Nominal size range
- DN 15 - 150 / 1/2" - 6"
- Pressure rating
- ASME 150 – 2500 / PN10 – 320
- Operating temperature range
- -200 to +593 °C / -320 to +1053 °F
- Leakage class
- ANSI/FCI 70-2 Class IV / Class V (metal seat) and Class VI (soft seat)
- End connection types
- Flanged ends, welded ends
- Flashing service capability
- Suitable for flashing services; high-velocity fluids can flow through the valve while reducing contact with the valve body and internal components
- Noise and cavitation control
- Optional multi-hole Tendril trim for noise reduction or cavitation elimination
- Low fugitive emissions
- Compliant with ISO 15848; optional bellows packing
- Material compatibility options
- NACE material options available
- Safety integrity level
- SIL 3 certified
- Special cleaning options
- Optional special cleaning for oxygen, cryogenic, and other services
Application scenarios
Flow control in high-pressure-drop, high-velocity flashing services
For controlling high-pressure-drop, high-velocity liquid services involving flashing. The AU Series uses a one-piece angle valve body suited to flashing services, reducing contact between high-velocity fluids and the valve body and internal components. Optional multi-hole Tendril trim is available for noise reduction or cavitation control.
Compact piping flow control in space-constrained installations
For industrial control loops where space is limited and the piping requires a change in direction. The AU Series uses a one-piece angle valve body suitable for space-constrained piping layouts and offers flanged or welded end connection options.
Cryogenic media flow control
For control loops handling industrial gases, LNG, or other cryogenic media. The AU Series supports operating temperatures as low as -200 °C and offers special cleaning options for cryogenic services.
Selection points
Suitable for High-Pressure-Drop and High-Velocity Service
The AU Series is suitable for high-pressure-drop and high-velocity control service and provides precise flow control.
Noise and Cavitation Control with Tendril Multi-Hole Trim
Optional multi-hole Tendril trim is available for noise reduction or cavitation elimination.
Integrated Angle Body for Flashing Service and Constrained Piping Layouts
The integrated angle body is suitable for flashing service or space-constrained piping layouts. High-velocity fluids can flow through the valve while reducing contact with the valve body and internal components.
Low Fugitive Emissions and Bellows Packing Option
The product complies with ISO 15848 low-fugitive-emission requirements and can be equipped with optional bellows packing.
Wide Pressure and Temperature Range
Pressure ratings range from ASME 150 to 2500 and PN10 to PN320. The operating temperature range is -200 to +593 °C.
In-Line Component Replacement for Easier Maintenance
The valve does not need to be removed from the pipeline when replacing components, making it suitable for applications where maintenance dismantling work must be minimized.
Installation notes
Isolate and depressurize before maintenance
Components in the AU Series can be replaced while the valve remains installed in the pipeline. Isolate the process medium and confirm that the line has been depressurized before inspection, disassembly, or replacement.
Maintain dedicated cleanliness for oxygen and cryogenic services
For oxygen, cryogenic, or similar services, confirm that the valve has the appropriate special cleaning treatment. Maintain internal cleanliness during installation to prevent contaminants and foreign matter from entering.
FAQ
What demanding services are Neles AU Series top-guided angle valves suitable for?
The Neles AU Series is suitable for high-pressure-drop and high-velocity services, particularly flashing services and space-constrained angle-piping layouts. Its angle body reduces contact between high-velocity fluids and the valve body and internal components as the fluid flows through the valve, helping extend valve service life.
How should AU Series trim be selected based on the medium, pressure drop, and flow requirements?
The AU Series offers multiple trim capacities and flow characteristics to optimize control performance under different operating conditions. For services requiring noise control or involving cavitation risk, multi-hole Tendril trim can be evaluated. The specific configuration must be confirmed based on the actual model, medium properties, pressure drop, flow rate, and application conditions.
What are the pressure, temperature, and size ranges of Neles AU Series angle valves?
The series covers sizes from DN 15–150 (1/2″–6″), pressure ratings from ASME 150–2500 or PN10–320, and operating temperatures from -200 to +593 °C. The allowable pressure-temperature combinations must be confirmed for the specific model, valve body end connections, materials, and application conditions.
What sealing classes and fugitive-emission control options are available for the AU Series?
Metal-seated AU Series valves are available with ANSI/FCI 70-2 Class IV or Class V leakage performance, while soft-seated valves are available with Class VI performance. The valves comply with ISO 15848 low-fugitive-emission requirements and can be equipped with optional bellows packing. The sealing arrangement should be selected according to the medium, temperature, differential pressure, and leakage class requirements.
Does the Neles AU Series angle valve need to be removed from the pipeline for maintenance?
The series uses a top-entry design and quick-change trim, so the valve does not need to be removed from the pipeline when replacing relevant components, improving maintenance convenience. Robust top-guided trim and standard hardened surface treatment also help extend operating life. The maintenance plan must be confirmed according to site conditions and the specific model.