K.KALI SUNDARARAJAN – DM(L&H)
Hydraulic SEALS & O-RINGS
SEAL TYPES
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SEALS
DYNAMIC SEALS
STATIC SEALS ( O-RINGS)
Dynamic Seals
SEALING INTERNALLY ROD SEALS
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TYPES
SEALING EXTERNALLY PISTON SEALS
COMPACT SEALS
COMPACT SEALS
LIP SEALS
LIP SEALS
Hot Tip
In Free State
Mounted in Cylinder
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SELECTION OF SEALS
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Operational Reliability Long life time Simple Installation Tolerance to Hydraulic medium at High and Low Temparature High resistance to Mechanical damage (Extrusion in to the gap) Good dimensional elasticity to ensure faultless operation even with eccentricity in cylinder
SEALS IN A CYLINDER Piston Seal
Rod Seal
Wiper Seal ( to prevent dust ingress)
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SEALING MECHANISM and INFLUENCING FACTORS LOGO
Tightness Friction Wear Operating Pressure Velocity – 0.1 to 0.5 m/sec Temperature Hydraulic Media Contamination Geometrical factor- stroke, Housing, gap width and fit
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FUNCTIONING Sealing action based on Axial/Radial deformation of cross section in installed state Deformation achieved by proper design of housing The ensuing reaction force gives contact pressure necessary for sealing This further supported by pressure of the medium
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SEALING ACTION
No Pressure
Under Pressure
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DIMENSION
When Pressure applied outside: ID of the ring should fit (Interference) When Pressure applied inside: OD of the ring should fit (Interference)
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OPERATING PRESSURE Vs. MATERIAL HARDNESS
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Operating pressure less than or equal to 160bar: 70 Shore-A Operating pressure more than160bar: 85 Shore-A
TYPES
Type-A: NBR, Shore hardness 70 Type-B: NBR, Shore hardness 85 Type-C: VITON, Shore hardness 85
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