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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 join type bonnet
3. Body and bonnet: high quality and precision tooled cast iron. Single-part bonnet
4. Backseat for on-line maintenance
5. Rising wheel