SEAL KIT APPLICATION CHART
 
Equipment
Operating condition
Magnified view of sealing system
Feature

0~16.7MPa

{0~170kgf/cm2

-30~100°C
ISI are used parallel because of high speed and high pressure. Noxlan is used for rubber material because of severe operating conditions.

0~17.7MPa

{0~180kgf/cm2

-30~100°C
HBY is used for upper hydraulic seals to reduce the friction. HBTS is also used to absorb impact pressure and reduce the friction. XRI with high wear resistance characteristics is used for gas seals to prevent oil scraping off from the gas chamber

0~0.3MPa

{0~3kgf/cm2

-30~100°C
SVY is used for low friction and high lip follow ability to eccentricity. This packing is flat metal case type with dust lip for easy seal replacement.

0~8.3MPa

{0~85kgf/cm2

-30~100°C
Low friction SPGO is used for the piston rings to improve system response. O ring is used for back ring to make compact the piston unit. For rod seals, oil seals SCJY with backup ring for high pressure operation is used. This seal has low friction resistance and high sealing ability. 

Equipment
Application
Operating conditional
Piston sealing system
Feature
Rod sealing system
Feature
Boom cylinder

Arm cylinder

Bucket cylinder
Standard specifications

0~31.4 MPa
{0~320kgf/cm²}

-30~100°C

High durability for severe operating condition with the selected materials; SPGW that is applicable for high pressure and KZT that removes foreign objects in hydraulic fluid oil and prevents seal damages caused by adiabatic compression.

HBY is used to assure the longevity of rod seals and its combination with DWIR prevents oil scraping off.
Heat resistance
specifications

0~31.4MPa
{0~320kgf/cm²}

-30~120°C

Fluoro rubber (F201) is applied to the back ring of SPGW to enable high temperature operation.

Heat resistant polyurethane rubber (U641) is used to HBY and hydrogenated NBR (G506) to rod seals. Oil scraping off can be prevented by using DKBI.
Cold resistance
specifications

0~31.4MPa
{0~320kgf/cm²}

-50~80°C

Standard material for back ring of SPGW is low temperature resistant nitrile rubber.

Low temperature resistant nitrile rubber (A903) is used for IUH.
Adjust cylinder
(grease cylinder)
0~78.5MPa
{0~800kgf/cm²}

-30~100°C

Special seal fro piston OUY is used to enable the operation of extremely short strokes under high pressure (under such operation, oil film can be broken with ordinary seals).

Because of small operation range of pressure, ISI is used in combination with backup ring of polyamide resin (80NP) of high extrusion proof characteristics.

Equipment
Application
Operating conditional
Piston sealing system
Feature
Rod sealing system
Feature
Boom cylinder

Arm cylinder

Bucket cylinder

Blade cylinder
0~20.6MPa
{0~210kgf/cm²}

-30~100°C

Compact SPG for medium pressure is used. Two WR are used to prevent scoring between the piston head and the cylinder tube that can be caused by high lateral load typical for such operating condition.

Nitrile rubber with high oil resistance (A505) and backup ring (19YF) are used for IUH. DKB is used for dust seals considering its advantage preventing oil scraping off.

Equipment
Application
Operating conditional
Piston sealing system
Feature
Rod sealing system
Feature
Hoist cylinder

Bucket cylinder
0~20.6MPa
{0~210kgf/cm²}

-30~110°C

Compact SPG for medium pressure is used. For hoist and bucket cylinder for which high temperature working characteristics are important, fluoro rubber (F201) is used for back ring material. For steering cylinder for which cold temperature working characteristics are important, low temperature resistant nitrile rubber (A980) is used.

HBY (U641 + 80NP) is used to prevent sliding heat increase at the packings. Hydride NBR (G506) is used for IUH.
Steering cylinder
0~20.6MPa
{0~210kgf/cm²}

-30~110°C

Because of wide operation range of pressure, HBY (U641 + 80NP) is used. Hydrogenated NBR (G506) is used for IUH.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
Hoist cylinder

Blade cylinder
0~20.6MPa
{0~210kgf/cm²}

-30~100°C

SPGW is used because of high impact pressure. KZT is used for both ends to prevent heat damage of packings by adiabatic compression.

Backup ring is used in combination with ISI to prevent extrusion. DKBI is used for dust seal to prevent oil scraping off.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
Derricking cylinder

Telescopic cylinder

Slide cylinder
0~20.6MPa
{0~210kgf/cm²}

-40~80°C

OUHR with stick slip proof characteristic is used considering the operating condition that requires to keep working pressure for a long time. O5ZF having small friction resistance is used for the material of wear ring.

HBTS is also used to prevent stick slip.
0~31.4MPa
{0~320kgf/cm²}

-30~100°C

SPGW is used because of high pressure operating condition. O5ZF having small friction resistance is used for the material of wear ring to prevent stick slip. KZT is used to prevent heat damage of the seals. By the combination of all above features, this system is excellent for severe operating condition.

Specially designed HBYR absorbs surge pressure for assuring high longevity of rod seals.
Jack cylinder
0~31.4MPa
{0~320kgf/cm²}

-30~100°C

OSI is used in combination with backup ring to improve the sealing ability.

USI with high sealing ability under low pressure is used. DKB (A980) used for dust seals has high sealing ability in low temperature and excellent characteristics to prevent oil scraping off.
Hydraulic suspension cylinder
0~20.6MPa
{0~210kgf/cm²}

-30~100°C

SPGW is used to meet the operating condition that requires durability against impact pressure and extremely short strokes.

To reduce the damage to rod seals, HBTS is used. IUH (A903) with high sealing ability in low temperature is also used.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
Dump cylinder
0~41.2MPa
{0~420kgf/cm²}

-50~100°C

For the operating condition that requires extremely high pressure, SPGW is used. Two WR are used considering lateral load that is typical for such operating condition.

Considering the extremely high operating pressure, HBY is used to reduce damage to rod seals. IUH (A903) with high sealing ability in low temperature is used.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
-----
0~20.6MPa
{0~210kgf/cm²}

-10~80°C

High durability SPG is used. Two WR are used to prevent scoring between the piston head and the cylinder tube that can be caused by high lateral load typical for such operating condition.

Packing and dust seal of nitrile rubber are used.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
-----
 0~20.6MPa
{0~210kgf/cm²}

-30~80°C

OUHR with stick lip proof characteristics is used considering the operating condition that requires to keep working pressure for a long time. O5ZF having small friction resistance is used for the material of wear ring.

HBTS is used to prevent stick slip.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
-----
 0~31.4MPa
{0~320kgf/cm²}

-10~100°C

SPGW is used since such operating conditions mainly performed under high pressure require the durability. This packing has also excellent durability for the operations requiring extremely short strokes.

HBTS is used for buffer ring to reduce high impact pressure. Please add a drain to improve durability.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
-----
 0~13.7MPa
{0~140kgf/cm²}

-30~100°C

High durability SPG is used. O5ZF having small friction resistance is used for the material of wear ring.

USHR is used for packing to prevent stick slip. DKB is used for dust seal to prevent the oil scraping off.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
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 0~4.9MPa
{0~50kgf/cm²}

-20~80°C
-----
-----

IUY (of special shape) is used for packing to prevent stick slip. Rareflon is molded on to the IUY lip.

Equipment
Application
Operating condition
Piston sealing system
Feature
Rod sealing system
Feature
-----
 0~13.7MPa
{0~140kgf/cm²}

-10~80°C
-----
-----

Fabric reinforced rubber V packing are used because in such operating conditions, fluids with poor lubricity, such as water and agricultural chemicals are handled and the frequency of operation is high. When pressure and frequency of operation are low, rubber V packings can be used.


E.S. Seal Sdn. Bhd - Hydraulic Cylinder Seal Repair Kits, Piston Sealing, Centaflex Coupling Specialist in Malaysia, Singappore