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OS&Y, Rising stem, Flexible wedge
Pressure seat Bonnet, Threaded or welded seat ring
ASTM A216 WCB, A217 WC6, A351CF8, A351CF8M,A351 CF3, A351 CF3M, A351 CN7M

A. Back up ring: Absors thrust applied by internal pressure
B. Thrust ring: Protects the soft metallic gasket from deformation
C. Gasket: Unique angular design provides superior sealing

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