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The planetary transmission gear also referred to as the ‘torque multiplier’ of ‘amplifier” is a simple tool designed to tighten and undo bolts and nuts, in particular the ones of large sizes. Bolts or nuts can be tightened to the torque of e.g. 1000 Nm (100 kGm) with the force of merely two fingers. The wrench (transmission gear) has a protective component, so called safety stud that is sheared when the applied force may be possibly too high. It prevents the transmission teeth from damage and makes the device sturdy and reliable. To tighten a bolt with controllable torque the operator has to attach a torque wrench with the setting range up to 400 Nm to the input (driving) bit with the square ½” (¾”) cross-section size. The required setting value for the input torque is to be read from a table that accompanies each transmission gear. It is the value that has to be set on the torque wrench. The desired torque is reached when a click is heard during tightening. Obviously, a handle with a ratchet is used to undo the bolt or nut, which enables quick detachment of the connection without the need to disengage the handle.

OSSA Machinery Works offers a new hydraulic pumps designed to supply hydraulic bolt tensioners. The power pack offers unsurpassed technical parameters and enables very fast operation with a wide range of pre-tensioning devices.
Operation of the remote control device (RCD):
a) ON/OFF button to switch the electric motor on and off
b) depressing the button 1: pressure is supplied to advance the piston of the pre-tensioning unit until the already preset pressure is reached,
c) releasing of the button 1: pressure is kept constant, the piston remains in the advanced position. The motor remains off.
d) depressing the button 2: the unit is depressurized, the piston of the pre-tensioning unit is retracted to its initial position (lowered)

Low clearance hydraulic torque wrenches are made up of a main device, i.e. the drive unit and various adapter size (related to hex size). Casings of these devices are made of  lightweight alloy based on aluminium and titanium compounds whilst the ratchet and driving units are manufactured with use of ‘ultra steel’ that makes them as sturdy and durable as titanium pieces. Hydraulic socket wrenches with adapters are perfectly suitable to tightening and loosening bolts on flange connections – it is why they are also called as hydraulic wrenches with adjustable torque for flanges. The wrenches collaborate with hydraulic power packs (800 bar) that can be powered by an electric motor or a compressed air drive. The power pack is remotely controlled by means of a dedicated remote control unit. Operation in the fully automatic mode is as option.

Bolts are tightened with the controlled torque up to the required limit, which is achieved by setting a specific oil pressure on a connected manometer, where the pressure corresponds to the desired torque. The torque values and associated oil pressures can be found on the table of torques that is attached to each wrench.