Introduction
The ANSI Globe Valve is a linear-motion valve used to start, stop, and regulate fluid flow within a pipeline.
Product Specifications
|
Parameter |
Description |
Range / Value |
|
Flow Design |
CFD-optimized flow path reduces turbulence |
Up to 12% pressure drop reduction |
|
Throttling Range |
Stable control zone for modulation |
20% – 80% stroke |
|
Disc Type |
Linear or parabolic contour options |
Linear / Equal-percentage |
|
Flow Data |
Cv values for system sizing |
2" – 16" full range |
|
Stem Design |
Guided stem for stable positioning |
ACME thread, Ra 0.8 μm finish |
|
Control Accuracy |
Suitable for continuous regulation |
Micro-metering capable option |
|
Wear Protection |
Reduced seat erosion during throttling |
Optimized mid-stroke flow control |
Target Applications
Refinery Hydroprocessing: Materials engineered in accordance with API Trim 8 and NACE MR0175/ISO 15156 limits to mitigate sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC) risks in downstream hydrotreating circuits.
Power Plant Steam Systems: Class 1500/2500 pressure seal globe valves designed for main steam lines and high-pressure boiler feed networks.
Chemical Process Networks: Cast CF8M/CF3M stainless steel flow-loop components configured for corrosive media transfer.
Cryogenic Gas Terminals: Extended bonnet options utilizing a specialized vapor column, designed to isolate stem packing from cryogenic fluids and protect packing integrity during -196°C LNG vapor processing.
Quality Control
• Applied at a minimum of 1.5 times the ASME B16.34 rated working pressure, held for mandatory durations relative to valve size to verify casting density.
• Soft-seated variants are qualified to Zero-Leakage (Rate A). Metal-to-metal seated profiles conform to standard API 598 or ISO 5208 Rate B leakage criteria.
• Third-Party Inspection (TPI): Optional on-site witness testing, hold-points, and ITP compliance hosting are available for major classification societies, including SGS, Bureau Veritas, TUV, and DNV (subject to contract agreement).
• Standard production includes visual and surface MT/PT testing, with optional volumetric Radiographic Testing (RT) per ASME B16.34 Appendix B to verify zero internal casting defects.
Commercial Terms
MOQ: 1 unit for large-bore or high-pressure classes (≥ 8", Class 600+); 10 units for standard stock-profile sizes (2" to 6", Class 150/300).
Production Lead Times: Estimated at 4 to 6 weeks for standard configurations utilizing stocked components; 12 to 14 weeks for custom foundry heats, calculated from technical sign-off and down-payment receipt.
Incoterms Options: Global logistics pricing structured on FOB Shanghai, CIF Houston, or DDP Rotterdam bases, depending on client-specified project site destinations.
Engineering Data: Reference 2D approval drawings and 3D CAD models are typically transmitted within 3 to 5 business days following formal datasheet clarification.
After-Sales Support
Factory warranty is valid for 18 months from the date of bill of lading (B/L) or 12 months from commercial field commissioning.
Interchangeable soft goods and wear components (including stem packing sets, bonnet gaskets, and disc assemblies) are retained in stock for maintenance dispatch.
Dispatched shipments are accompanied by standard Installation, Operation, and Maintenance (IOM) Manuals detailing generic bolt torque sequences and packing adjustment procedures.
Compliance & Engineering Standards
Heavy-duty globe valves are engineered strictly to API 623 and BS 1873, with pressure-temperature ratings fully compliant with ASME B16.34 (Class 150 to 2500).
Type-tested to API 624 and ISO 15848-1 Class BH, securing tight VOC leakage control to eliminate environmental non-compliance risks in chemical plant piping.
Features die-formed flexible graphite with Belleville spring washers and a precision-ground Ra 0.4 μm stem finish, extending maintenance-free intervals.
Face-to-face dimensions conform to ASME B16.10 and flanged ends to ASME B16.5, ensuring 100% drop-in interchangeability with standard global piping networks.
Core pressure-retaining components (including ASME SA216 WCB, SA352 LCC, and SA351 CF8M) are traceable via permanent heat numbers directly to EN 10204 3.1 Mill Test Certificates.
FAQ
Q: What is the tested service life of the ANSI Globe Valve under continuous steam throttling conditions?
A: Under Class 300 steam conditions at 425°C, the valve has demonstrated an average service life of 8–10 years in continuous modulation service. This is based on 50,000+ cycle fatigue testing and field feedback from thermal power installations.
Q: Has the valve been validated in real refinery hydroprocessing units?
A: Yes, it has been deployed in hydrodesulfurization units operating at 10–15 MPa with H₂S-rich media. Field monitoring over 36 months showed no measurable seat erosion beyond 0.05 mm.
Q: What is the verified Cv deviation between calculated and actual flow performance?
A: Independent flow bench testing shows Cv deviation is typically within ±5% compared to CFD predictions.
Q: What is the maximum allowable leakage rate after extended operation?
A: After 10,000 thermal cycles, soft-seated versions maintained leakage performance below ANSI/FCI 70-2 Class VI. Metal-seated versions remained within ISO 5208 Rate B limits without reseating adjustments.
Q: How does the valve perform in cryogenic LNG conditions?
A: The extended bonnet design maintains packing zone above -40°C even when process media reaches -196°C.
Q: What is the recommended maintenance interval under continuous industrial service?
A: Under refinery or power plant duty, inspection is recommended every 18–24 months, with packing replacement typically required every 3–4 years. Seat replacement intervals depend on media but average 6–8 years in corrosive service.
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