Composite Seals PTFE
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Benefits • No stick-slip even with low sliding speeds and even after prolonged downtimes • Low wear • Good dry-running properties • Simple design of installation grooves • Low friction • 0 3 mm to 0 3000 mm available • High pressure stability • Small installation spaces • Lubrication depot • For internally and externally sealing functions Type MRA and MRI are double-acting composite seals. They are primarily used with alternating directions of pressure (e.g. piston seals). Type SRI and SRA are single-acting composite seals. They have proven to be particular effective for sealing piston rods. The sealing effect is produced by the inherent preload of the PTFE profile ring vis-a-vis the rod and the preload of the rubber-elastic O-ring in the groove area. With rising system pressure the radial contact pressures increase as well. R otary composite seals are particularly well suited for sealing rotating shafts, such as in rotary transmissions, rotary distributors, rotary joints and swiveling motors in mobile hydraulics and machine tools. A specially designed slide ring based on PTFE or PE is pressed against the surface by an elastomer O-ring and additionally activated by the system pressure.

Composite Seals Fields of Application Versions and Operating Limits (1) Composite seals are particularly well suited Sliding speed for sealing pistons and rods in hydraulic and Temperature range pneumatic working cylinders. Service pressure They consist of two components: • a profile ring made of the high-strength fluoro-plastic, PTFE, or alternatively from an ultra-high-molecular PE for dynamic sealing of the sliding surface (primary seal) • an O-ring for static sealing in the groove area (secondary seal) 1 � MRA composite seal � O-ring serving as elastic pre-loading element Relief groove...

Type MRA | MRI Groove Dimensions *Depending on installation conditions, other profiles – differing from the standard dimensions provided – may be selected for composite seal type MRA (externally sealing) and type MRI (internally sealing). The respective groove dimensions are listed in the table below. Fitting Instructions • Insert O-ring into groove • Slide composite seals onto fitting shell using expander • Let composite seal snap into groove • If necessary, we recommend subsequent calibration using a sleeve • To assist with making the fitting tools, we will be happy to

Type SRI | SRA Groove Dimensions *Depending on installation conditions, other profiles – differing from the standard dimensions provided – may be selected for composite seal type SRI (internally sealing) and type SRA (externally sealing). The respective groove dimensions are listed in the table below. Fitting Instructions For rod diameters below 30 mm use axially accessible grooves. For rod diameters above 30 mm the seals may be installed in the closed grooves. • Inset O-ring into groove • Compress composite seal into a “kidney” shape and insert into groove • If necessary, we recommend...

Type MRR Groove Dimensions *Depending on installation conditions, other profiles – differing from the standard dimensions provided – may be selected for Rotary composite seal type MRR (internally and externally sealing). The respective groove dimens­ ons are listed in the table below. i Design and Action Principle Rotary Composite Seal ElastomerO-Ring Rotary Composite Seal System Pressure p Groove Dimensions Groove Dimensions Shaft seal internally sealing Shaft seal externally sealing Rotation speed Temperature range 56

Fitting Instructions See table, page 54 and 55. Special Versions With clamp-in flange Groove base diameter, static < 6,3 pm < 12,5 pm < 0,4 pm Surface Quality Contact surface, dynamic Rz < 1,6 pm Compounds On request, depending on application. With compression support

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