Ball valve locking device
AssigneeMueller Co.
InventorSemyon Fridlyand
Life of this patent
Estimating the term…
Abstract
A locking device for a ball valve of the type having an operating stem includes a post attached to the valve body with the post extending parallel but spaced axially from the valve stem and formed to receive a locking pin between the post and valve stem to prevent rotation of the stem.
Claims5
A lockable valve having a valve body, a flow passage through said body, a valve member disposed in said body and movable between a flow blocking position and a flow permitting position, said valve body having an opening, a valve stem connected at one end to said valve member and extending through said opening in said valve body, said stem having a surface shaped to cooperate with a tool for rotating said stem about an axis extending through said stem and said valve member to effect movement of said valve member between said flow blocking and flow permitting positions, a locking post extending from the exterior of said valve body and having a surface facing said stem with a first portion of said surface of said locking post engaging said portion of said stem and another portion being spaced from said stem and including a shaped recess, said stem having a flat surface portion facing said another portion of said surface of said locking post so that when a locking pin having a width sufficient to span the distance between the said flat surface portion of said stem and said shaped recess, rotation of said stem will be prevented.
Dependencies are inferred from the claim text.