Device and method for shear valves in power tools

Abstract

A hydraulic tool comprises a valve body with a sealing surface, a side surface, and a first fluid channel to fluidically couple the sealing surface and the side surface. The valve body rotates between a first position and a second position. A shear seal contacts the sealing surface, the shear seal comprising a second fluid channel to selectively couple with the first fluid channel when the valve body is in the first position and to selectively seal fluidically against the sealing surface when the valve body is in the second position. A drive shaft is coupled to the valve body via a one-way bearing. The one-way bearing couples the drive shaft rotationally to the valve body when the drive shaft rotates in a first direction and decouples the drive shaft rotationally from the valve body when the drive shaft rotates in a second, opposite direction.

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