The Neles GU Series top-guided globe valve is an industrial control valve featuring a top-guided, unbalanced design. The valve supports multiple pressure classes, including ASME 150–2500, and operating temperatures from -200 to +593 °C. It is equipped with quick-change, hardened-surface trim and certifications including SIL 3, API 607, and ISO 15848. It is suitable for continuous-operation applications such as oil and gas production, flow control in industrial steam systems, cryogenic LNG processes, and high-pressure-drop fluid control.
Neles top-guided globe valve, GU Series
Neles
Neles GU Series Top-Guided Globe Valve
Top-guided globe valve for flow control in oil and gas, steam, and cryogenic applications
- Category
- Globe Valves
- Nominal size range
- DN 15 - 150 / 1/2" - 6"
- Pressure ratings
- ASME 150 – 2500 / PN10 – 320 / JIS 10K – 20K
Specifications
- Valve design
- Unbalanced, top-guided
- Nominal size range
- DN 15 - 150 / 1/2" - 6"
- Pressure ratings
- ASME 150 – 2500 / PN10 – 320 / JIS 10K – 20K
- Operating temperature range
- -200 to +593 °C / -320 to +1053 °F
- Leakage class
- ANSI/FCI 70-2 Class IV / V (metal seats) and Class VI (soft seats)
- End connections
- Flanged or welded ends
- Trim design
- Top-guided, quick-change trim
- Trim surface
- Hardened surface as standard
- Trim options
- Multiple capacities and flow characteristics; perforated Tendril trim and micro-flow trim available
- Low fugitive emissions
- Compliant with ISO 15848
- Special material options
- NACE material options available
- Safety integrity level
- SIL 3 certified
- Fire-safe certification
- API 607
- Special cleaning treatment
- Optional special cleaning treatment for oxygen, cryogenic and other services
Application scenarios
Process flow control in oil and gas production facilities
Used in process piping in oil and gas production facilities for stable and precise flow control of liquid, gas or steam media.
Cryogenic process piping for industrial gases and LNG
Used in cryogenic media flow control piping in industrial gas and LNG facilities. The product has a minimum operating temperature of -200 °C, with special cleaning treatment available for cryogenic service.
Industrial steam process control systems
Used for steam process media flow control in petrochemical, chemical and power plant applications. The product offers trim options with multiple capacities and flow characteristics to support stable and precise process control.
High-pressure-drop process fluid control loops
Used for throttling and flow control of high-pressure-drop process fluids in continuously operating facilities. Perforated Tendril trim can be selected to reduce noise or cavitation effects.
Selection points
Quick-change trim and online maintenance design
The GU Series features top-guided construction and quick-change trim, allowing internal components to be maintained or replaced without removing the valve from the pipeline.
Unbalanced top-guided design with a hardened surface as standard
The GU Series uses an unbalanced top-guided design with a hardened trim surface as standard.
Trim options with multiple capacities and flow characteristics
The GU Series offers trim with multiple capacities and flow characteristics. Perforated Tendril trim and micro-flow trim can be configured to meet different flow control requirements.
Wide operating temperature capability
The GU Series has an operating temperature range of -200 to +593 °C, covering cryogenic to high-temperature service. Final selection must be verified against the actual media and operating conditions.
Low fugitive emissions and safety certifications
The GU Series meets the ISO 15848 low fugitive emissions requirements and has SIL 3 and API 607 fire-safe certifications.
Installation notes
Confirm cleaning and material configuration for special media
For oxygen, cryogenic, or corrosion-resistant material service, confirm before installation that the valve uses the appropriate special cleaning process or NACE material option.
FAQ
What process control conditions are suitable for Neles GU Series top-guided globe valves?
The Neles GU Series is suitable for flow control applications ranging from general to demanding service. It covers DN 15–150 (1/2–6 inches), ASME 150–2500, PN10–320 or JIS 10K–20K pressure ratings, and a temperature range of -200 to +593 °C. The specific trim, seat and material configuration must be confirmed based on the actual media, pressure drop, temperature and control requirements.
How does the GU Series achieve stable and precise flow control?
The series uses an unbalanced top-guided design with robust top-guided trim to improve the stability of plug movement. Standard configurations can use Neles diaphragm actuators and Neles valve controllers. Multiple trim capacities and flow characteristics are available to match the requirements of different control loops.
How should GU Series trim be selected for high-pressure-drop service or conditions involving potential cavitation and noise?
Perforated Tendril trim can be considered for applications requiring noise reduction or cavitation mitigation. Micro-flow trim can be selected for extremely low flow control. Final selection should be based on the media state, pressure drop, flow range and allowable noise level to optimize valve operating performance.
Does maintenance of Neles GU Series globe valves require removal from the pipeline?
The GU Series features top-entry construction and quick-change trim, so the valve does not need to be removed from the pipeline when replacing relevant components. This design helps reduce maintenance time and minimize system downtime caused by maintenance.
What sealing and special-service configurations are available for the GU Series?
Metal seats can achieve ANSI/FCI 70-2 Class IV or V leakage performance, while soft seats can achieve Class VI. The series also meets the ISO 15848 low fugitive emissions requirements, and bellows packing is available as an option. Special cleaning treatment can be selected for oxygen, cryogenic and other services, and NACE material options are also available. The specific configuration must be confirmed based on the actual model and application conditions.