Bolted bonnet (BB) design.
Full port or reduced port design.
Back seal design.
Rising stem with outside screw and yoke.
Renewable seat or welding seat.
Special Request: locking device (interlock), position indicator, limit switch.
Extended bonnet for cryogenic & underground service is available.
Standards
Design and Manufacture: API 600.
Face to Face: ASME B16.10.
Butt Welded Ends: ASME B16.25.
Test and Inspection: API 598.