Patent ID: 9587763
Date: 2017-03-07
CPC Classifications: E03B,F16K

Claim:
1. A magnetic valve security device for a fire hydrant, wherein the fire hydrant includes a valve stem, the valve stem having a valve nut, the valve stem being connected to a valve wherein rotation of the valve stem opens and closes the valve, the device comprising: an inner cylindrical member having a lower end with a recess to receive the valve nut in a non-rotational relationship, and an upper end with a first coupling element; an outer rotational member mounted over the inner cylindrical member for rotation with respect to the inner cylindrical member, the outer rotational member including a second coupling element; and a movable element including a non-magnetic cobalt body configured to embed a fitted magnetizable piece such that the fitted magnetizable piece is flush with the non-magnetic body, the movable element urged to a first position, to decouple the first and second coupling elements, the movable element being moveable to a second position to couple the first and second elements in a non-rotational relationship, wherein rotation of the outer rotational member rotates the inner cylindrical member to rotate the valve stem and operate the valve with the movable element in the second position.