Abstract: A power valve wrench includes a power drive assembly having a motor and a speed reduction device driving an annulus which defines a large center opening and a plurality of lugs or recesses on the interior wall of the annulus. The opening in the annulus receives a drive member having complementary lugs or recesses. The drive member, in turn defines a concentric polygonal opening which may be square, hexagonal, octagonal or other regular polygon shape which receives a complementarily configured stanchion of a valve handwheel drive member. A selection of valve handwheel drive members having 4, 6, 8, 10 or 12 slots may be utilized with the power valve wrench. A safety or retaining ring removably attached to the valve handwheel drive member retains the member on a valve handwheel.

Abstract: An apparatus for engaging and rotating large and/or difficult to turn handwheels of valves includes a castellated drive member and separable ratchet drive assembly. The drive member includes a plurality of T-shaped slots which receive and retain the spokes of a valve wheel. The drive member also includes a multi-sided stub defining a through, axial passageway. The stub is removably received within a complementarily configured passageway in a collar of the ratchet drive assembly. The collar, in turn, is received within a housing and is acted upon by a pawl. An elongate handle extends radially from the housing and facilitates the application of significant torque to the apparatus and an associated valve handwheel.