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Catalog

T-Lon Solutions


GPI Series Piston Seal

The GPI hydraulic piston seal is a proven reliable seal for both low and high pressure systems. The GPI seal is a double-acting filled T-LON® PTFE compound with an o-ring elastomer energizer designed for reciprocating applications. The filled PTFE seal ring is manufactured with an interference fit with the bore and optimum compression with the o-ring energizer. This offers excellent sealability at low pressures and high pressures when the cylinder experiences ballooning. Since the energizers are standard AS568 o-ring sizes, many elastomer compounds are readily available. The chamfers on the GPI ring aid in assembly and crossing over ports in the cylinder.

 

 

Advantages:

  • Low seal drag/friction (Minimize energy loss)
  • No Stick-slip (Smooth Operation)
  • Long seal life from T-LON® filled PTFE compounds
  • Available for cylinders up to 20″ diameter

Applications:

  • Mobile Hydraulic Cylinders
  • Pneumatic Piston Cylinders
  • Agriculture Equipment
  • Hydraulic Valves and Pumps
  • Filling Machines
  • Testing Machinery

Face Grooves (Optional): For applications of high pressure rise rates, pressure spikes, and rapid change of direction, the seal is apt to experience blow-by. To prevent blow-by and to energize the seal rapidly, face grooves are added to both sides of the seal.

Technical Data:

(1) T-LON® seal compound determines allowable pressure and velocity ranges

Velocity: Up to 12 ft/s

Pressure: Up to 8500 psi (Function of e-gap and T-LON® compound. Max velocity and pressure cannot be used together)
Most Common:

BRONZE FILLED PTFE (“21” or “22”)

  • Highest Extrusion Resistance (Higher bronze content increases extrusion/wear resistance; I.E. larger e-gap allowable)
  • Good sealability

GLASS/MoS2 FILLED PTFE (“31”)

  • Good wear resistance for tubes with rougher surface finish
  • More chemical resistant and used in applications when seal could run dry

(2) Loader compound determines temperature and chemical compatibility

Most common:

NBR SHORE 70 A (“P”)

  • Working Temp. Range -30°F to 230°F (250°F intermittent)
  • Commonly used with greases, aliphatic hydrocarbon mineral and vegetable oils, and various hydraulic fluids

EPDM SHORE 70 A (“E”)

  • Working Temp. Range -50°F to 300°F (400°F steam intermittent)
  • Commonly used with water, steam, water/ silicone/ glycol based fluids, and app’s affected by ozone and weathering.

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Contact T-Lon 888.340.TLON