Structural features:
(1) Allow online inspection and maintenance
(2) Fixed design of spherical upper and lower axis structure
(3) Structural Design of BTL Combination Seal Valve Seat
(4) Design of Double Block and Discharge Function (DBB) Structure
(5) Design of automatic pressure relief structure for valve chamber overpressure
(6) Multi combination sealing structure and anti blowout design of valve stem
(7) Fire safety structure design
(8) Anti static structure design
(9) Structural design of discharge and venting functions
(10) Emergency sealing grease structure design
(11) Mechanical limit design for position indication and on/off
