NFPA/T3.19.18 R1-2009.

Title:
Fluid power – Sealing devices – Groove dimensions for radial compression type piston rings, 4 pgs.

Scope:
This standard specifies dimensions, tolerances and surface finish requirements for grooves for radial compression type piston rings used in fluid power cylinders, pumps and valves, to assure proper performance of radial compression type piston rings. The groove widths specified will not accommodate additional anti-extrusion devices that may be recommended.