The Neles GU series top-guided globe control valve features a top-guided, unbalanced design, supports ASME 150–2500 and other pressure classes, and operates across a temperature range of -200 to +593 °C. It is equipped with quick-change and hardened surface trim, and carries SIL 3, API 607, and ISO 15848 certifications. It is suitable for flow control in oil and gas production and industrial steam systems, as well as LNG cryogenic processes and high-differential-pressure fluid control in continuously operating plants.
Neles top-guided globe control valve, GU series
Neles
GU Series Top-Guided Unbalanced Globe Control Valve | Neles
Product code: GU
Top-guided unbalanced globe control valve for flow control in oil and gas production, industrial steam, and LNG cryogenic processes, with online trim replacement.
- 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 applications are the Neles GU series top-guided globe control valves suitable for?
The Neles GU series is suitable for flow control applications ranging from general to severe service, covering DN 15–150 (1/2–6 in.), ASME 150–2500, PN10–320, or JIS 10K–20K pressure classes, and a temperature range of -200 to +593 °C. Specific trim, seat, and material configurations must be confirmed based on the actual medium, differential pressure, temperature, and control requirements.
How does the GU series achieve stable and precise flow control?
The series uses an unbalanced top-guided construction combined with a rugged top-guided trim to improve plug motion stability. Standard configurations can be equipped with a Neles diaphragm actuator and Neles valve controller, and a variety of trim capacities and flow characteristics are available to match the control requirements of different control loops.
How should GU series trim be selected for high-differential-pressure applications where cavitation or noise may occur?
For applications requiring noise reduction or cavitation elimination, the multi-hole Tendril trim can be considered; for very low flow control, the low-flow trim is available. Actual selection should be confirmed based on the medium conditions, differential pressure, flow range, and allowable noise level to optimize valve performance.
Does maintenance of the Neles GU series globe control valve require removal from the pipeline?
The GU series features a top-entry construction and quick-change trim design, allowing related components to be replaced without removing the valve from the pipeline. This construction helps shorten maintenance time and reduces system downtime caused by maintenance.
What sealing and special service configurations are available for the GU series?
The series achieves ANSI/FCI 70-2 Class IV or Class V shutoff with metal seats and Class VI with soft seats; it also complies with ISO 15848 low fugitive emissions requirements, with bellows packing available as an option. Special cleaning for oxygen, cryogenic, and similar services can be selected, and NACE material options are also provided; specific configurations must be confirmed based on the actual model and application conditions.