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SAM ENGINEERS
 
ROD SEALS
 
Rod seals are considered to be one of the decisive factor for the functioning of the hydraulic cylinder. Leakage through the rod seal can cause accidents / environmental damages. It is important to properly pair the rod seal & wiper for the best sealing performance. If a less aggressive rod seal is paired with an aggressive wiper, the wiper can scrape off the microscopically thin film of oil that remains on the rod in microscopic surface imperfections during the return stroke, resulting in system leakage. The thickness of the oil film depends upon the surface finish, rod seal and surface speed of cylinder.
 
Types of Piston Seals:
Single acting / Unidirectional Rod Seals ( Capable of sealing from one side )
Double acting /Bidirectional Rod Seals ( Capable of sealing from both sides )
 
Material Selection:
The most common in use material for seals used are :
Nitrile [ -30ºC TO 100ºC ]
H-Nitrile [ -35ºC TO 150ºC ]
H-Polyurethane [ -30ºC TO 110ºC ]
EPDM [ -40ºC TO 150ºC ]
Silicone [ -60ºC TO 200ºC ]
Viton [ -20ºC TO 200ºC ]
Kalrez [ -40ºC TO 260ºC ]
Alfas [ -15ºC TO 206ºC ]
Teflon Virgin [ -200ºC TO 206ºC ]
Teflon Filled [ -200ºC TO 206ºC ]
 
ROD SEAL TYPES:
 
SUPER DUTY ROD U SEALS
 
Seal Information
Material 94 A Urethane Seal Rubber Energizer Polyacetal Anti-Extrusion Ring
Maximum Operating Pressures
Maximum Speed
FT / Second
Temperature Range
-50 to 175 F
Temperature Range
-50 to 230 F
3
1.5
5,500 PSI
10,000 PSI
5,500 PSI
7,500 PSI
Maximum Extrusion Gap
Pressure 2400 PSI 3,750 PSI 6,000 PSI 7,500 PSI 10,000 PSI
Max. Radial Gap .040 .032 .024 .016 .010
 
Featuring high pressure and high shock load capability, this seal utilizes the same twin lip design found in the RTU style. With the main body of seal molded from high performance polyurethane, this seal incorporates a dynamically designed nitrile energizer and a tough polyacetal anti extrusion ring.
 
SUPER DUTY ROD U SEALS
 
Seal Information
Material 95 A Urethane
Temperature Range -65 to +250 F
Pressure Range 0 to 5000 PSI
 
ASYMMETRIC TWIN LIP ROD U SEALS
 
Seal Information
Material 94 A Urethane
Temperature Range -65 to +220 F
Pressure Range 0 to 5000 PSI
 
The twin lip design helps solve difficult rod sealing problems by providing lower friction, increasing stability, and high dynamic lip force, while preventing air penetration from outside the cylinder.
 
URETHANE ROD U SEALS
 
Seal Information
Material 90 A Urethane
Temperature Range -65 to +220 F
Pressure Range 0 to 5000 PSI
 
Style RU seals are molded from high quality urethane and are designed specifically for rod applications.
 
HEAVY DUTY ROD U SEALS
 
Seal Information
Material 92 A Urethane
Temperature Range -40 to +230 F
Pressure Range 0 to 6000 PSI
 
These seals are specifically designed to seal on their inside diameter and engineered to attain maximum life and reliability in dynamic rod sealing.
 
HEAVY DUTY ROD U SEALS
 
Seal Information
Material 92 A Urethane
Temperature Range -40 to +230 F
Pressure Range 0 to 6000 PSI
 
These seals are specifically designed with second lip on their inside diameter and engineered to attain maximum life & reliability in dynamic rod sealing. This feature results in reduced leakage, less friction, increased stability and prevents air and other contaminants from entering the cylinder.
 
HEAVY DUTY ROD U SEALS
 
Seal Information
Material 92 A Urethane
Temperature Range -40 to +230 F
Pressure Range 0 to 6000 PSI
 
These seals are designed specifically to seal on their inside diameter and engineered to attain maximum life and reliability in dynamic rod sealing. They employ a hard plastic I.D back up ring to reduce the possibility of extrusion.
 
EI ROD U SEALS W/BACK-UP RINGS
 
Seal Information
Material Rubber, Fabric, Acetal
Temperature Range -22 to +212 F
Pressure Range 0 to 5800 PSI
 
Incorporating a rubber seal lip, a rubberized fabric heel and an acetal back up ring. This seal provides excellent sealing ability and high extrusion resistance.
 
POLYURETHANE U SEALS
 
Seal Information
Material 92 A Urethane
Temperature Range -65to +220 F
Pressure Range 0 to 5000 PSI
 
The HMU multi lip rod u seal combines the pressure compensating, unidirectional characteristics of a u seal with multi lip sealing effectiveness of compression type stacked packings. Made from premium materials, the HMU utilizes several sealing lip edges for dry rod performance while minimizing friction. The multi lip design maintains a critical sealing edge even though increasing pressure moves the line of contact down towards the heel.
 
EI ROD U SEALS W/BACK-UP RINGS
 
Seal Information
Material 80 A Buna-N Rubber
90 A Flurocarbon
Temperature Range Buna-N -40 to +250 F
FC -20 TO +400 f
Pressure Range Buna-N 0 to 1000 PSI
FC 0 TO 2000 PSI
 
Incorporating a rubber seal lip, a rubberized fabric heel and an acetal back up ring. This seal provides excellent seal-ability and high extrusion resistance.
 
KR ROD U SEALS
 
Seal Information
Material 90 A Urethane
Temperature Range -65 to +220 F
Pressure Range 0 to 150 PSI
 
UKR u seals are designed to act as positive sealing, low friction replacement for conventional rubber u-seals. Molded from polyurethane, UKR u-seal provide long life & high resistance against extrusion. Low friction allow these seals to run smoothly in lubricated & non lubricated cylinder. Available for rod sealing, the flexible dynamic lip provides very low breakaway friction & steady motion.