ISO 3939:1977

Fluid power systems and components — Multiple lip packing sets — Methods for measuring stack heights

Specifies methods for measuring sealing devices having more than one seal in the set. Specifies methods for measuring stack height in order to determine that the sets are to an acceptable dimensional standard. Does not specify the dimensions for packing sets or their components. Describes three acceptable methods, and figure 1 shows a typical measuring device for the methods 1 and 2, the figures 3 and 4 show a typical setup for the methods 2 and 3, and figure 2 shows a typical device for the method 2.