Type 0820 is a two piece double acting piston seal which consists of one special mixture PTFE profile ring and an o-ring as energizing element.
Application
Injection moulding machines , fork-lift trucks , loading platforms , cranes , agricultural machinery and valves for hydraulic and pneumatic systems.
Technical information
Low friction , free of stick-slip
Simple groove design and low axial housing heights
Long service life
High sliding speed
Wide range of temperature and chemicals depending on the o-ring material
Minimum static and dynamic friction coefficient for a minimum energy loss and operating temperature
Wide range of dimensions
operation principle
We recommend using special assembly tool (See section; Hydraulic Sealing Elements General Installation Information) and to have open groove design for dimensions that are smaller than Ø 40 mm. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the sealing element must be oiled with system oil.
Options
It is recommended to use with minimum two piston guide rings in long stroke cylinders , minimum one guide ring in short stroke and under low radial loads. For special applications that require high temperatures or resistance to chemicals , piston seal is being manufactured with special mixture PTFE and FKM material. The permissible sealing gap values of 0820 piston seal is given in the below table.
Tables
OPERATING CONDITIONS
MEDIA
Mineral oils (DIN 51524)
HFA and HFB
HFC
TEMPERATURE
from -30°C till +105°C
from +5°C till +60°C
from -30°C till +60°C
PRESSURE
max. 400 Bar
max. 400 Bar
max. 400 Bar
SPEED
max. 5.0 m/s
max. 5.0 m/s
max. 5.0 m/s
Note: The above data are maximum values and cannot be used at the same time.
SURFACE ROUGHNESS
Ra
Rmax
Sliding Surface
max. 0.2 µm
2.0 µm
Groove Base
max. 1.6 µm
6.3 µm
Groove Flanks
max. 3.2 µm
15 µm
Note: It is recommended to have 50% to 90% of the working surface material contact area value.
PERMISSIBLE SEALING GAP
B (mm)
Smax (mm)
x
150 Bar
250 Bar
400 Bar
2.2
0.25
0.20
0.15
3.2
0.4
0.25
0.15
4.2
0.4
0.25
0.20
6.3
0.5
0.30
0.20
8.1
0.6
0.35
0.25
9.5
0.7
0.50
0.30
Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.
OPERATING CONDITIONS
MEDIA
Mineral oils (DIN 51524)
HFA and HFB
HFC
TEMPERATURE
from -30°C till +105°C
from +5°C till +60°C
from -30°C till +60°C
PRESSURE
max. 400 Bar
max. 400 Bar
max. 400 Bar
SPEED
max. 5.0 m/s
max. 5.0 m/s
max. 5.0 m/s
Note: The above data are maximum values and cannot be used at the same time.
SURFACE ROUGHNESS
Ra
Rmax
Sliding Surface
max. 0.2 µm
2.0 µm
Groove Base
max. 1.6 µm
6.3 µm
Groove Flanks
max. 3.2 µm
15 µm
Note: It is recommended to have 50% to 90% of the working surface material contact area value.
PERMISSIBLE SEALING GAP
B (mm)
Smax (mm)
x
150 Bar
250 Bar
400 Bar
2.2
0.25
0.20
0.15
3.2
0.4
0.25
0.15
4.2
0.4
0.25
0.20
6.3
0.5
0.30
0.20
8.1
0.6
0.35
0.25
9.5
0.7
0.50
0.30
Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.
OPERATING CONDITIONS
MEDIA
Mineral oils (DIN 51524)
HFA and HFB
HFC
TEMPERATURE
from -30°C till +105°C
from +5°C till +60°C
from -30°C till +60°C
PRESSURE
max. 400 Bar
max. 400 Bar
max. 400 Bar
SPEED
max. 5.0 m/s
max. 5.0 m/s
max. 5.0 m/s
Note: The above data are maximum values and cannot be used at the same time.
SURFACE ROUGHNESS
Ra
Rmax
Sliding Surface
max. 0.2 µm
2.0 µm
Groove Base
max. 1.6 µm
6.3 µm
Groove Flanks
max. 3.2 µm
15 µm
Note: It is recommended to have 50% to 90% of the working surface material contact area value.
PERMISSIBLE SEALING GAP
B (mm)
Smax (mm)
x
150 Bar
250 Bar
400 Bar
2.2
0.25
0.20
0.15
3.2
0.4
0.25
0.15
4.2
0.4
0.25
0.20
6.3
0.5
0.30
0.20
8.1
0.6
0.35
0.25
9.5
0.7
0.50
0.30
Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.
OPERATING CONDITIONS
MEDIA
Mineral oils (DIN 51524)
HFA and HFB
HFC
TEMPERATURE
from -30°C till +105°C
from +5°C till +60°C
from -30°C till +60°C
PRESSURE
max. 400 Bar
max. 400 Bar
max. 400 Bar
SPEED
max. 5.0 m/s
max. 5.0 m/s
max. 5.0 m/s
Note: The above data are maximum values and cannot be used at the same time.
SURFACE ROUGHNESS
Ra
Rmax
Sliding Surface
max. 0.2 µm
2.0 µm
Groove Base
max. 1.6 µm
6.3 µm
Groove Flanks
max. 3.2 µm
15 µm
Note: It is recommended to have 50% to 90% of the working surface material contact area value.
PERMISSIBLE SEALING GAP
B (mm)
Smax (mm)
x
150 Bar
250 Bar
400 Bar
2.2
0.25
0.20
0.15
3.2
0.4
0.25
0.15
4.2
0.4
0.25
0.20
6.3
0.5
0.30
0.20
8.1
0.6
0.35
0.25
9.5
0.7
0.50
0.30
Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.
