Hydraulic seal

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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