A gate valve has a body with a gate chamber intersected by a flow passage and a stem chamber extending from the gate chamber. A gate is carried in the gate chamber. A stem, when rotated, causes linear movement of the gate between open and closed positions. A neck on the gate extends into the stem portion of the chamber. The neck has a cylindrical outer diameter, and a seal seals the neck to the stem portion of the chamber. The stem extends into engagement with a cavity in the neck. A ball screw interface is located between the stem and the cavity of the neck.
https://app.acclaimip.com/pdf/OCo_D8zPj6rEKj9qKc-Ppq_eH2N6lMD5XSvJFzk/US7523916B2
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