GRI Series Bi-Directional Rod Seal
With over 30 years of application success, the GRI rod seal is a proven reliable seal for both low and high pressure systems.
The GRI rod seal is a bi-directional seal and filled T-LON® PTFE compound with an oring elastomer energizer designed for reciprocating applications. The filled PTFE seal ring is manufactured with an interference fit with the rod and optimum compression with the O-ring energizer. The optimized sealing surface allows a fluid film to form between the seal and rod during reciprocating motion with excellent sealability for static holding applications.
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.
Advantages:
- Low seal drag/friction (Minimize energy loss)
- No Stick-slip (Smooth Operation)
- Long seal life from T-LON® filled PTFE compounds
- Available for rods up to 44″ diameter
Applications:
- Hydraulic Rams/Presses
- Hydraulic & Pneumatic Valves
- Injection Molding Machines
Technical Data:
(1) T-LON® seal compound determines allowable pressure and velocity ranges
- Velocity: Up to 13 ft/s
- Pressure: Up to 8500 psi
(Function of e-gap and T-LON® compatibility 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
CARBON/GRAPHITE FILLED PTFE (“36”)
- Good for pneumatics and non-lubricating fluids
- More chemical resistant and used in applications with short stroke movements/vibrations
(2) Loader compound determines temperature and chemical
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.