Scrapers · WEM
Operating Conditions
| Speed | Max. 15 m/s PTFE materials |
| Temperature | -45 °C to + 200 °C. Depending on seal and O-Ring material |
| Media | Mineral oil-based hydraulic fluids, flame retardant hydraulic fluids, environmentally friendly hydraulic fluids (bio-oils), phosphate ester, water, air and others, depending on scraper ring and O-Ring material compatibility. |
Important Note : The above data are maximum values and cannot be used at the same time, e.g. the maximum operating speed depends on material type, pressure, temperature and gap value. Temperature range also depends on media.
Recommended Materials
The following material combinations have proven effective for hydraulic applications:
WEM in PS8WM
All round material for light to medium hydraulic applications linear, short stroke or helical movements in mineral oils, flame retardant hydraulic fluids, phosphate ester, bio-oils or fluids having low lubricating properties:
| O-Ring | NBR 70 Shore A | N |
| FKM 70 Shore A | V | |
| Set Code | PS8WMN or PS8WMV |
WEM in PS61B
For medium to heavy applications with linear movements in mineral oils and other media with good lubrication:
| O-Ring | NBR 70 Shore A | N |
| FKM 70 Shore A | V | |
| Set Code | PS61BN or PS61BV |
For specific applications, all PTFE materials are available.
Other material combinations are listed in Materials for WEM.
Materials for WEM
Installation Dimensions - Standard Recommendations
| Series No. | Rod Diameter dN f8/h9 | Groove Diameter | Groove Width | |
| Series No. WEM3 Standard Application | Series No. WEL5 Light Application | D3 H9 | L3 +0.2 | |
| WEM | 6 - 11.9 | 12 - 64.9 | dN + 4.8 | 3.7 |
| WEM | 12 - 64.9 | 65 - 250.9 | dN + 6.8 | 5.0 |
| WEM | 65 - 250.9 | 251 - 420.9 | dN + 8.8 | 6.0 |
| WEM | 251 - 420.9 | 421 - 650.9 | dN + 12.2 | 8.4 |
| Series No. | Bore Diameter | Step Width | Radius | O-Ring Cross Section |
| D4 H11 | a min. | r1 max. | d2 | |
| WEM | dN + 1.5 | 2.0 | 0.4 | 1.78 |
| WEM | dN + 1.5 | 2.0 | 0.7 | 2.62 |
| WEM | dN + 1.5 | 3.0 | 1.0 | 3.53 |
| WEM | dN + 2.0 | 4.0 | 1.2 | 5.33 |
Ordering Guide
WEM complete with O-Ring, standard application:
| Series | WEM |
| Rod Diameter | dN = 50.0 mm |
| TMK Part No. | WEM0500050 |
WEM 0500 050 PS8WM N
1 2 3 4 5
| 1 | TMK Series No. |
| 2 | Rod Diameter x 10 |
| 3 | Groove Width x 10 |
| 4 | Material Code ( Seal Ring ) |
| 5 | Material Code ( O-Ring ) |
