A quarter-turn valve with a spherical closing element held between two seats. Characteristics include quick opening and good shut-off. Ball valves are widely used as on/off valves in the chemical process and other industries. Special designs (With V notches or fingers) are available for throttling applications. Larger valves with heavier balls
(e.g., on pipelines) may use trunnions to help support the ball and prevent damage to soft internals. Designs are typically, one, two or three piece.

Bellow Sealing device which prevents line media leaking between the stem and the body.

The above attached product's specification is as follow:

Quoting Standards
Design & Manufacture: API 6D or API 608 or ANSI B 16.34
Face to Face: ANSI B 16.10 OR API 6D
End Flange: ANSI B 16.5
Welding Ends: ANSI B 16.35
Pressure-Temp Rating: ANSI B 16.34
Inspection & Test: API 6D or API 598
Product Construction
Split Body, Full Bore, Trunnion Mounted Ball, Double Seal
Design-Floating Seats, Double Block & Bleed. Blow-out
Proof Stem, Cavity Relieving Seats.