Hydraulic Cylinder Seals
Application example for hydraulic cylinder
Application Range of Hydraulic Seals for Reciprocating Motion
Special packings for piston seals
Special packings for rod seals
Special packings for both piston and rod seals
Application Range of Relating Product for Hydraulic Equipment
Application Range of Relating Product for Hydraulic Equipment
Application examples by equipment
| Equipment | Application | Opening Conditions | Piston Sealing System | Rod Sealing System |
|---|---|---|---|---|
|
Power Shovel  |
Boom cylinder Arm cylinder Bucket cylinder |
Standard specifications 0 ~ 31.4 MPa 0 ~ 320 kgf/mc2 – 30 ~ 100°C
Heat resistance specifications 0 ~ 31.4 MPa 0 ~ 320 kgf/mc2 – 30 ~ 120°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.
Fluoro rubber (F201) is applied to the back ring of SPGW to enable high temperature operation. |
HBY is used to assure the longevity of rod seals and its combination with DWIR prevents oil scraping off.
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 ~ 31.4 MPa 0 ~ 320 kgf/mc2 – 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. |
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|
Adjust cylinder |
0 ~ 78.5 MPa 0 ~ 800 kgf/mc2 – 30 ~ 100°C |
Special seal for 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. |
|
|
Mini Construction  Mini Back Hoe  |
Boom cylinder Arm cylinder Bucket cylinder Blade cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 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 (19Nitrile) 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. |
|
Wheel Loader  |
Hoist cylinder Bucket cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 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 packing. Hydride NBR (G506) is used for IUH. |
|
Steering cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 30 ~ 110°C |
Because of wide operation range of pressure, HBY (U641 + 80NP) is used. Hydrogenated NBR (G506) is used for IUH. |
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|
Bulldozer  |
Hoist cylinder Blade cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 30 ~ 100°C |
SPGW is used because of high impact pressure. KZT is used for both ends to prevent heat damage of packing 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. |
|
Truck Crane 
Wheel Crane  |
Derricking cylinder Telescopic cylinder Slide cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 40 ~ 80°C |
OUHR with stick slip 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. |
OUHR with stick slip 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. |
|
0 ~ 31.4 MPa 0 ~ 320 kgf/mc2 – 30 ~ 100°C |
SPGW is used because of high pressure operating condition. O5ZF having small friction resistance is used for the material or 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. |
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|
Jack cylinder |
0 ~ 31.4 MPa 0 ~ 320 kgf/mc2 – 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. |
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|
Hydraulic suspension cylinder |
0 ~ 20.6 MPa 0 ~ 210 kgf/mc2 – 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. IUH (A903) with high sealing ability in low temperature is also used. |