NPT (BSP, SW) ball valve is a quarter-turn shut-off valve whose main distinction lies in its end connection type:
NPT (National Pipe Thread – US standard) → Tapered threaded connection.
BSP (British Standard Pipe – European/Asian standard) → BSPP (parallel) or BSPT (tapered) threaded connection.
SW (Socket Weld) → Valve ends are prepared for welding directly to pipes for stronger, leak-proof, permanent connections.
The valve body and ball mechanism are essentially the same, only the end connections differ to suit different piping standards and installation needs.

Features Of Socket weld (SW,NPT ,BSP)Ball Valve

Quarter-turn operation → Fast open/close, minimal torque.
Multiple Connection Types → Flexibility to meet global piping standards (threaded or welded).
Compact Design → Smaller, lighter than flanged ball valves.
High sealing performance → Precision ball + resilient seat (PTFE, RPTFE, PEEK).
Wide size range → Typically DN8–DN100 (¼"–4") for threaded, up to larger sizes for SW.
Pressure & Temp. Ratings:
Threaded (NPT/BSP): 1000 PSI (PN63) typical in stainless steel.
Socket Weld: Up to Class 800–2500 (higher pressure, steam service possible).
Maintenance → Easy replacement in threaded types; durable and permanent in socket weld type.

Materials Of Socket weld (SW,NPT ,BSP)Ball Valve

Body: Brass, Stainless Steel (SS304, SS316), Carbon Steel, Forged Steel.
Ball: Stainless Steel, Chrome-plated Brass, Alloy Steel.
Seats & Seals: PTFE, RPTFE, PEEK (for high temperature/pressure).
Stem Seals: PTFE, Graphite (for fire-safe designs).

Manufacturing & Standards Of Socket weld (SW,NPT ,BSP)Ball Valve

Threads:
NPT → ASME B1.20.1
BSP → ISO 228 / ISO 7
Socket Weld → ASME B16.11
Design / Testing → API 6D, API 598, ISO 5211 (for actuated types)
Certifications → ISO, CE, ATEX, API 6D for oil & gas applications.

Applications Of Socket weld (SW,NPT ,BSP)Ball Valve

NPT / BSP Threaded Ball Valves:
Small/medium pipelines (water, oil, gas, compressed air).
Plumbing, HVAC, chemical dosing.
Easy to install/remove (maintenance-friendly).
SW (Socket Weld) Ball Valves:
High pressure and temperature pipelines.
Oil & Gas, petrochemical, steam service.
Permanent, vibration-resistant joints.
Used in critical piping where leaks cannot be tolerated.