Subsea Axial Nozzle Check Valve
Highlights
- Compact design
- High Cv
- Fast response time
- Non-Slam closure
ATV provides a full range of Axial Nozzle Check valves for production, processing and transmission applications, suitable for pressure up to Class 20.000 psi and Class ANSI 2500, and water depths up to 10000 ft (3000 m).
An Axial Nozzle Check Valve is the preferred solution for critical applications where backflow prevention is requested. It is mostly installed downstream of rotating equipment, such as subsea pumps and compressors, to protect them from any possible damage due to the backflow.
The Axial Nozzle Check Valves have typically a full bore design with optimized design of body cavity to grant a streamlined flow with almost constant section all through the inside passage and a spring-loaded disk with short stroke length, that grant low pressure drop, non-slam and a high-speed response time. A low flow is required to open the valve, ensuring high fluid dynamic performance.
The centralized spring mechanism ensures stable and smooth reply during the operations. Furthermore, since the body is monobloc, there are fewer potential leak paths than the other types of check valves.
Due to its internal design, the Axial Nozzle Check Valve is not suitable for installation in lines where the piggability is a requirement.
Design is carried out using advanced parametric design tools and solid modelling programs. Valves design undergoes sophisticated structural and fluid dynamic analysis, carried out with FEA and CFA analysis: inner profiles are optimized in order to control the turbulence level and to increase device performances.
Materials are sourced from qualified suppliers on the base of specifications that reflect the industry standards (API, ASTM, NORSOK, BS, DIN or others), but do also incorporate additional requisitions resulting from long experience.
ATV designs, manufactures and tests its products in accordance with all the relevant Industry standards and codes (ANSI, API, ASME, DNV, BS, ISO, NACE, PED and others).
ATV stresses its willingness to produce engineered valves; therefore, it welcomes requests for special size, class and design requirements.
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Subsea Axial Nozzle Check Valve - Specifications
SPECIFICATION
| MAIN DESIGN STANDARD | API 17D / ISO 13628-4 | API 6DSS / ISO 14723 |
| APPLICATIONS | Compressor / Pump Protection, Backflow Prevention, Low Pressure Drop, Chemical Injection Systems | Compressor / Pump Protection, Backflow Prevention, Low Pressure Drop, Chemical Injection Systems |
| APPLICABLE STANDARDS | API 17D, ISO 13628, ASME VIII, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards | API 6DSS, ISO 14723, ASME VIII, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards |
| RANGE | 2 1/16” ÷ 11”, Class 3000 psi and 5000 psi, 1 13/16” ÷ 7 1/16” Class 10000 psi, 1 13/16” ÷ 4 1/16” Class 15000 psi, 1 13/16” ÷ 3 1/16” Class 20000 psi. Any other size upon request. | 2” ÷ 60” Class ANSI 600, 2” ÷ 48” Class ANSI 900, 2” ÷ 36” Class ANSI 1500, 2” ÷ 20” Class ANSI 2500. Larger sizes available on request. |
| WATER DEPTH | Up to 3000 m (10000 ft). Greater depth upon application. | Up to 3000 m (10000 ft). Greater depth upon application. |
MAIN FEATURES
| One-Piece body construction | ||
| Full Bore | ||
| Spring-Assisted Disk | ||
| Metal seated | ||
| Wear resisting hardfacing on sealing surfaces |
END CONNECTIONS
| Flanges (to API 17D / ISO 13628-4) | ||
| Flanges (to ASME B16.5 up to 24” and B16.47A for 26” and larger) | ||
| Compact flanges (to Norsok L005) | ||
| Buttwelded ends | ||
| Hub ends for clamped connections (as per customer requirement) |
MATERIALS
| Carbon steel | ||
| Low alloy steel | ||
| Stainless steel | ||
| Duplex and superduplex stainless steel | ||
| Nickel Alloy |