1. Reliable sealing, a piston effect force the sealing resilent against the ball by the set of preloaded spring.
2. Blow-our proof design, the stem features the design with a backseat.
3. East to maintain, just only need to open the valve bonnet.

Standard:
DESIGN & MANUFACTURING:API 6D
Face to Face Dimension: ANSI B 16.10
Flanged End Dimension: ANSI B 16.5
Test & pressure：ANSI B 16.34
Testing & Inspection: API 598