Radial Seal MR21
DESCRIPTION
Radial Seal MR21 is a double-acting seal for rotary movements and joint sealing and is used in hydraulic rotary transmission systems. The radial seal MR21 seal the space between the pressure lines, separating them from each other and is suitable for sealing high hydraulic pressures during rotating movements.
It consists of a PTFE profile ring and an O-ring as a preload element.
The radial seal MR21 has small dimensions, is highly resistant to hydraulic fluids and has very low friction and, by choosing the appropriate material, good resistance to high and low temperatures.
APPLICATION
Exscavators
Grippers
Swivel joints
Hose reels
High pressure valve stem
Diferent rotary distributors
| Standard material | ||||
|---|---|---|---|---|
| Material Set Code | SN209 | SF208 | ||
| O-ring 70 ShA | NBR | FPM | ||
| Profile Ring | PTFE glass,MoS2 | PTFE glass,MoS2 | ||
For low temperature applications, or excellent medium-rubber compatibililty in special applications a few materials are recommended and available on request
| Pressure, Speed | |
|---|---|
| Working pressure, P | Max 40 Mpa |
| Running speed v, | Up to 0.2 m/s |
| Medium, Working Temperature | ||
|---|---|---|
| Material Code | SN209 | SF208 |
| Hydraulic oils: HL, HLP | -30.. +100 ˚C | -10.. +150 ˚C |
| HFA, HBA fluids | +5..+60 oC | – |
| HFC fluids | -30..+60 oC | – |
| HFD fluids | – | -10.. +150 ˚C |
| Water | +5..+100oC | – |
| Mineral greases | -30 to +100 | -10.. +150 ˚C |
| Tolerances | ||
|---|---|---|
| Ød | emax | ØD |
| ≤ 500 mm | H8/f8 | H9 |
| Surface finish* | ||
|---|---|---|
| Surface roughness | Ra | Rmax |
| Sliding surfaces | 0.05 .. 0,3μm | ≤ 2.5 μm |
| Groove base | ≤ 1.6 μm | ≤ 6.3 μm |
| Groove flanks | ≤ 3 μm | ≤ 15 μm |
*Contact area Mr = 50% to 90% at cutting depth c=Rz/2 and reference line Cref=0% Surface hardness must be 45 – 60 HRC with 0.5mm layer in depth