SYMMETRICAL SEALS

 

Symmetrical seals are parts that are balanced in shape and can be interchanged for both piston and rod use which makes them useful for emergency retrofit situations where there is a lack of information about the application and an urgent seal is required.

The back-heel of the seal sits square in the centre of the seal groove on the non-pressure side and only has contact across the sealing lips, this makes the design unstable and it can sometimes roll and tilt in the groove under pressure creating possible leak-paths and seal damage (chevron packing sets are not susceptible to this).

Other than for chevron packing sets and emergency situations, we would always recommend that you utilise one of our asymmetrical rod or piston seals as these have certain design attributes that provide increased stability, sealing performance and a reduction in friction.

IMPORTANT - Please Note: The data shown below are maximum values and operating ranges and cannot be used at the same time.

For example: The maximum operating speed will depend on material type chosen, working pressure, application temperature and clearance gap values.  The temperature range shown is also dependent on choice of material and media to be sealed.

Product Range

ProfileNameOperating RangeSummary
KB21
KB21Pressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The KB21 profile is a symmetrical sharp-lipped O-Ring energised U-Cup seal and is commonly used in the hydraulic repair market as it can function in both rod and piston applications. The O-Ring energiser in this seal provides further sealing force across the sealing lips to ensure leak free performance even …Read More
KB21Q
KB21QPressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The KB21Q is a modification of our standard KB21 profile and has been designed to help provide a more positive sealing effect directly to the main seal lips. The X-Ring energiser used in this seal is less susceptible to being blown out from the energiser cavity as can sometimes happen …Read More
KB22
KB22Pressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
KB22 is a pressure activated packing set that comprises of a main U-ring sealing element and a male pressure/support ring. The main U-Ring sealing element is designed to provide initial sealing force across the sealing faces upon installation. Sealing force is increased under system pressure through the pressure/support ring being …Read More
KB22A
KB22APressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
KB22A is a packing set that comprises of a main U-ring sealing element and a male pressure/support ring. The main U-Ring sealing element is designed to provide initial sealing force across the sealing faces upon installation. Sealing force is increased under system pressure through the pressure/support ring being forced into …Read More
KB28
KB28Pressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
Profile KB28 is a single acting /uni-directional U-Cup seal. Its symmetrical lip design offers the choice of both piston or rod use and the positive shaped lip provides excellent fluid film removal from the mating metal component while providing minimal friction resistance. Commonly used on both pneumatic and hydraulic actuators …Read More
SB06
SB06Pressure Max: 400 bar
Temperature Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The SB06 profile is a symmetrical lipped seal and is commonly used in the repair market as it can function in both rod and piston applications. Although popular, the SB06 is not recommended for new designs or where the user can be sure of the profile required for their application, …Read More
SB06A
SB06APressure Max: 400 bar
Temperature Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The SB06A profile is a modification of the more standard SB06 seal. It too is a symmetrical lipped seal and is commonly used in the repair markets as it can function in both rod and piston application, however it has improved groove geometry to allow it to be used in …Read More
SB07
SB07Pressure Max: 400 bar
Temperature Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The SB07 profile is a symmetrical lipped O-Ring energised U-Cup seal and is commonly used in the hydraulic repair market as it can function in both rod and piston applications. The O-Ring energiser in this seal provides further sealing force across the sealing lips to ensure leak free performance even …Read More
SB07A
SB07APressure Max: 400 bar
Temperature Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The SB07A profile is a symmetrical lipped energised U-Cup seal that provides both primary and secondary sealing functions. The primary elastomeric sealing element provides excellent dry rod sealing performance and is commonly used in both safety and environmentally critical applications where rod seal leakage could be catastrophic. The main U-Cup …Read More
SB07Q
SB07QPressure Max: 400 bar
Temperature Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The SB07Q is a modification of our standard SB07 profile and has been designed to help provide a more positive sealing effect directly to the main seal lips. The X-Ring energiser used in this seal is less susceptible to being blown out from the energiser cavity as can sometimes happen …Read More
XB54
XB54Pressure Max: 400 bar
Temperature
Min: -55 °C Max: 210 °C
Speed
Max: 0.7 m/s
The XB54 profile is a symmetrical lipped solid seal that can function in both rod and piston applications and is normally only used in the hydraulic repair market where a seal with extreme compression is required to prevent leakage. This seal is not recommended for new applications due to the …Read More