MSS SP-72

Covers — ball valves with flanged or butt-welding ends for general service, addressing design, materials, pressure rating, and testing.

Does NOT cover (exclusions) — the following are governed elsewhere:

• Threaded / socket-weld / solder-end ball valves → MSS SP-110.
• Process/petroleum-grade metal ball valves → API 608.
• Ratings and wall thickness basis → ASME B16.34; testing detail → API 598 / MSS SP-61.

SP-72 targets general-service applications; select API 608 where refinery-grade requirements apply.

SP-72 sets minimum requirements for general-service ball valves:

• Design — body/ball/stem construction, port type (full or reduced), and end connections (flanged or butt-weld).
• Materials — approved body and trim materials for general service.
• Testing — shell and seat pressure testing to defined acceptance leakage.

MSS SP-72 covers ball valves with flanged or butt-welding ends for general service, specifying design, materials, pressure ratings, and shell/seat testing. It is a practical procurement standard for general industrial ball valves.

Where petroleum or process-grade requirements apply, API 608 is typically specified instead; SP-110 covers the small-bore threaded and socket-weld end variants. Ratings trace back to ASME B16.34.

Engineering Note: Match port type to the hydraulic requirement — a reduced-port ball valve adds pressure drop that a full-port valve avoids.