Patent ID: 8122789

Claim:
Pumping apparatus comprising: a gland nut and a device for the adjustment of said gland nut, said gland nut being provided with a plurality of gripping means through which said gland nut can be caused to rotate, said device comprising: an engaging member, and actuator means to cause said engaging member to effect a working movement from a first position to a second position, wherein said engaging member is capable of effecting a one-way engagement with said gripping means in order to rotate said gland nut through a predetermined angle during the working movement from the first position to the second position, said actuator means comprises a hydraulically operated piston, said engaging member is pivoted at an extremity of said piston, said gland nut has a flange having an outer edge, said plurity of gripping means comprise a plurality of recesses provided at predetermined angular intervals along the circumference of the outer edge of said flange, said engaging member being shaped in such a way as to engage each of said plurality of recesses in a one-directional way.