MD 170X145X25.4X12.7-LCompact piston seal with guide rings, anti-extrusion rings and seal integrated into the piston seal assembly
MD-L seals are compact, double-acting piston seals. They have a nitrile rubber sealing ring with a polyester elastomer anti-extrusion rings and polyacetal guide rings on both sides. The anti-extrusion rings provide improved high pressure performance by reducing the likelihood of gap extrusion. The integral guide rings do not require additional external piston guide rings. The anti-extrusion and guide rings are split for easy installation.
Dimensions
| D |
170 mm
|
Cylinder bore diameter |
|---|---|---|
| D1 |
167.1 mm
|
Piston outside diameter |
| D2 |
161.7 mm
|
Additional groove diameter |
| d |
145 mm
|
Piston groove diameter |
| L |
25.4 mm
|
Piston groove width |
| L2 |
12.7 mm
|
Additional groove width |
| S |
12.5 mm
|
Radial depth |
| R |
max. 0.8 mm
|
Groove radius |
| C |
min. 6.5 mm
|
Lead-in chamfer length |
| tol D |
0.1 mm
|
Upper limit deviation |
|---|---|---|
|
0 mm
|
Lower limit deviation | |
|
H9
|
Tolerance class for cylinder bore diameter | |
| tol D1 |
h11
|
Tolerance class for piston outside diameter |
| tol D2 |
h9
|
Tolerance class for additional groove diameter |
| tol d |
0 mm
|
Upper limit deviation |
|
-0.1 mm
|
Lower limit deviation | |
|
h9
|
Tolerance class for piston groove diameter | |
| tol L |
0.35 mm
|
Upper limit deviation |
|
0.1 mm
|
Lower limit deviation | |
| tol L2 |
0.1 mm
|
Upper limit deviation |
|
0 mm
|
Lower limit deviation |
Pressure and speed
| Pressure |
max. 250 bar
|
| Speed |
max. 1 m/s
|
Operating temperature
| T6 |
max. 120 °C
|
Extreme upper temperature limit |
|---|---|---|
| T5 |
max. 110 °C
|
Reduced performance upper temperature limit |
| T4 |
max. 110 °C
|
Upper operating temperature limit |
| T3 |
min. -20 °C
|
Lower operating temperature limit |
| T2 |
min. -25 °C
|
Reduced performance lower temperature limit |
| T1 |
min. -40 °C
|
Extreme lower temperature limit |
|
Maximum values of application parameters (e.g. pressure, speed, temperature, e-gap) should not be applied continuously nor simultaneously.
|
||
Materials
| Primary sealing element |
Nitrile Rubber (N80/047)
|
| Additional element |
Acetal (POM POM/076)
|
| Additional element |
Polyester (TPC-ET72/075)
|
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