fulcrum axis is provided centrally of the two arms to pivot the sealing lip into contact with the surface to be sealed application_number US 83145177 A description the packing method of the invention is based essentially on the fact that the profile of the sealing element is that of a two armed lever in which the hydraulic surfaces acting on either side of the fulcrum are in such proportion to one another that depending on the applied pressure the sealing edge is urged against the relatively movable surface only as tightly as is required for the assurance of a good sealing action if this fundamental condition is observed a great number of variations become possible with regard to the particular embodiment of the packing of the invention the appended drawings show a number of important embodiments but the subject matter of the invention is not restricted to these examples fig1 shows a pressure balance shaft packing ring with a substantially axially aligned sealing element 1 which is supported on an inlaid ring 2 and on the axial portion of angular stiffening ring 3 around shaft 4 the dynamically acting sealing edge 11 contacts shaft 4 to provide the sealing action the portion of the sealing element 1 connected to the stiffening ring 3 and a.