Hydraulic Dashpot is charged with shock-absorbing fluid. The piston is provided with ports and valves. This is mounted on one end of a piston rod and divides the cylinder into two chambers. The dashpot also comprises an adjustable bypass accommodated inside the piston rod or inside an extension on rod travels in and out of the cylinder. It can be provided with a bore. The cross-section of the bypass during the compression phase can be established independent of its cross-section during the suction phase. Each plunger operates in conjunction with a radial inlet or outlet. The control rod with a rotary connection is accommodated inside the bore that extends through the piston rod and can be alternately connected to the plunger connections.