1. Stem: forged steel, single-part construction, ACME screw
2. Body-bonnet gasket: 150-600 LB graphite + stainless steel spiral wound gasket. 900 LB “ring joint” type bonnet
3. Body and bonnet: high quality and precision tooled cast iron. Single-part bonnet
4. Double wall bellows seal
5. Backseat for on-line maintenance
6. Rising wheel
7. Position indicator
8. Anti-rotation device for prevention of torsion of bellows seal
9. Bellows seal welded onto stem