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FAQ
What are the key advantages of ball valves compared to gate valves and globe valves?
90° rapid opening and closing, full bore with virtually no flow resistance, soft seals that ensure zero leakage, and easy operation, making them suitable for industrial pipelines requiring high flow rates and emergency shut-off.
What are the maximum nominal diameters corresponding to the 150 LB to 2500 LB pressure classes?
150 LB: maximum 56 inches; 300 LB: maximum 48 inches; 600 LB: maximum 42 inches; 900 LB: maximum 36 inches; 1500 LB: maximum 30 inches; 2500 LB: maximum 24 inches.
What are the core standards that American standard ball valves must comply with?
Design complies with ASME B16.34/API 608; flanges comply with ASME B16.5/B16.47; structural length follows ASME B16.10; and testing follows API 598/API 6FA.
Which type of ball valve should be selected for pipelines carrying slurry or pulverized coal containing particles?
Select a hard-seal, wear-resistant ball valve with a tungsten carbide-coated ball and seat, featuring a self-cleaning scraper mechanism to prevent particles from jamming or scratching the sealing surfaces. Its service life is 3 to 5 times longer than that of a standard ball valve.
What key inspections are performed on ball valves before shipment?
Spectral material verification of key components, non-destructive testing, body pressure testing at 1.5 times the rated pressure, high- and low-pressure seal testing at 1.1 times the rated pressure, and additional fire-resistant and anti-static verification for high-risk operating conditions.
How should one choose between floating-ball and fixed-ball ball valves?
For sizes below DN200 and pressure ratings up to PN64, select medium- and low-pressure floating-ball ball valves, which offer low cost and reliable sealing; For high-pressure, large-diameter long-distance pipelines, select fixed-ball ball valves, which offer strong resistance to deformation and feature a dual-shut-off pressure relief safety mechanism.
What type of ball valve is suitable for highly corrosive acid and alkali pipelines?
Select ball valves with 316L or duplex steel bodies, or PTFE-lined ball valves, paired with EPDM or PTFE corrosion-resistant seals to prevent leaks caused by the medium corroding the valve body.
How can I obtain the product’s compliance and traceability documentation?
Each ball valve is assigned a unique traceability number. A complete set of material certificates, test reports, and ASME/API certification documents is included with the shipment. The entire production chain data can be retrieved using this number, enabling full quality traceability.
