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|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Power Shovel |
|
Boom cylinder
Arm cylinder
Bucket cylinder
|
| |
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|
Standard specifications
0 ~ 31.4 MPa
0 ~ 320 kgf/mc
– 30 ~ 100
|
| |
|
|
| 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. |
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|
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|
HBY is used to assure the longevity of rod seals and
its combination with DWIR prevents oil scraping off.
|
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|
|
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Heat resistance specifications
0 ~ 31.4 MPa
0 ~ 320 kgf/mc
– 30 ~ 120
|
| |
|
|
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. |
| |
|
|
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|
Cold resistance specifications
0 ~ 31.4 MPa
0 ~ 320 kgf/mc
– 50 ~ 80
|
| |
|
|
Standard material for back ring of SPGW is low temperature
resistant nitrile rubber. |
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|
|
|
Low temperature resistant nitrile rubber (A903) is
used for IUH.
|
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|
|
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Adjust cylinder (grease cylinder)
|
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|
|
0 ~ 78.5 MPa
0 ~ 800 kgf/mc
– 30 ~ 100
|
| |
|
|
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.
|
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|
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|
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|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Mini Construction
Mini Back Hoe
|
|
Boom cylinder
Arm cylinder
Bucket cylinder
Blade cylinder
|
| |
|
|
0 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 30 ~ 100
|
| |
|
 |
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.
|
|
|
| |
|
|
|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Wheel Loader
|
|
Hoist cylinder
Bucket cylinder
|
| |
|
|
0 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 30 ~ 110
|
| |
|
 |
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. |
| |
|
|
| |
|
|
|
|
0 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 30 ~ 110
|
| |
|
 |
 |
Because of wide operation range of pressure, HBY (U641
+ 80NP) is used. Hydrogenated NBR (G506) is used for
IUH.
|
|
|
| |
|
|
|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Bulldozer |
|
Hoist cylinder
Blade cylinder
|
| |
|
|
0 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 30 ~ 100
|
| |
|
 |
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.
|
|
|
| |
|
|
|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Truck Crane
Wheel Crane
|
|
Derricking cylinder
Telescopic cylinder
Slide cylinder
|
| |
|
|
0 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 40 ~ 80
|
| |
|
 |
| 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. |
| |
|
 |
|
HBTS is also used to prevent stick slip.
|
| |
|
|
| |
|
|
0 ~ 31.4 MPa
0 ~ 320 kgf/mc
– 30 ~ 100
|
| |
|
 |
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.
|
| |
|
|
| |
|
|
|
|
0 ~ 31.4 MPa
0 ~ 320 kgf/mc
– 30 ~ 100
|
| |
|
 |
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 ~ 20.6 MPa
0 ~ 210 kgf/mc
– 30 ~ 100
|
| |
|
 |
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.
|
|
|
| |
|
|
|
Application
|
Opening
Condition
|
Piston
sealing system
|
Feature
|
Rod
sealing system
|
Feature
|
Dump Truck |
|
|
0 ~ 41.2 MPa
0 ~ 420 kgf/mc
– 50 ~ 100
|
| |
|
 |
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.
|
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|
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|
