Bal Seal® spring-energized rotary seals

We offer several families of rotary seals suitable for a wide range of temperature and pressure/velocity (PV) applications. Our spring-energized rotary seal solutions include flange seals and seals with metal locking devices. Our high-performance materials offer excellent wear and long life, and our Bal Spring™ energizer compensates for lip wear, thermal cycling and tolerance variations. Metal locking rings are available to provide secure installation with low insertion forces.

Types:  Rod, piston, lip, wiper, dust
Sizes:  From 0.031 in. to 75 in. You can find information on large diameter seals here.

Rotary Seal Selection Guide

Type Standard Seal Cross Section (in.) Seal Inside Diameter (in.) Suggested Operating Conditions Features and Benefits
Pressure Range Temperature Range °F (°C) Surface Speed (ft/min) (M/sec)
Uncaptivated Seal Gland (kg/cm2) Captivated Seal Gland (kg/cm2)
KSSx From 0.063 thru 0.125 From 0.125 to 1.000 Pressure* Differential From 15 (1) Vacuum to 3000 (211) Continuous -65° to +350° (-54° to +177°) Intermittent to +550° (+288°) to 3000 (15) • Low insertion force
• Autoclavable
• Best sealing at high temperature
• Longest seal life
KSx From 0.125 thru 0.500 From 1.000 to 34.00
K31x From 0.031 thru 0.125 From 0.063 to 1.000 to 2000 (10)
KF31x From 0.125 thru 0.500 From 1.000 to 34.00
KPx From 0.031 thru 0.188 From 0.063 to 1.000 From 7 (0.5) to 15 (1) to 7500 (38) • Low friction 
• Long life 
• Good sealing 
• High temperature
KPFx From 0.094 thru 0.500 From 1.000 to 14.00
RS31x From 0.031 thru 0.500 From 0.063 to 75.00 Not applicable Vacuum to 3000 (211) to 3000 (15) Better sealing 
• Lower cost 
• Requires retaining
S31x From 0.016 thru 0.500 From 0.020 to 12.00 Not recommended to 25 (1.8) Continuous -20° to +200° (-29° to +93°) Intermittent to +250° (+121°) to 250 (1.3)
71x From 0.063 thru 0.500 From 0.063 to 14.00 Vacuum to 60 (4) to 750 (4) • Moderate cost 
• Good sealing
PBx From 0.063 thru 0.500 From 0.063 to 14.00 to 15 (1) to 1000 (5) • Compatibility with most fluids 
• Lowest cost 
• Low friction

This selection guide represents only a small portion of the many rotary seal solutions that we offer.

The LKS® high PV seal

Our LKS® high PV seal delivers reliable, consistent performance and unprecedented levels of service life and predictability. The innovative, multi-component LKS seal offers exceptional protection against leakage in harsh media, temperatures, pressures and speeds. Under high pressures and velocities, the LKS seal guards against extrusion of the seal jacket material by supporting it in hardware with little or no clearance between the seal and rotating shaft. The seal's unique design forces the wear pattern of the jacket material to take place at the lip contact area, not the hinge point. You can find more information on the LKS seal here.