Piston Seals · PQM
Operating Conditions
| Pressure | Up to 50 MPa with mineral oil. Up to 30 MPa for media with reduced lubricating properties. |
| Speed | Up to 2 m/s with reciprocating movements |
| Temperature | -45 °C to +200 °C. Depending on seal, O-Ring and X-Ring material |
| Media | Mineral oil-based hydraulic fluids, flame retardant hydraulic fluids, environmentally friendly hydraulic fluids (bio-oils), phosphate ester, water and others, depending on temperature, seal, O-Ring and X-Ring material compatibility see Materials for PQM |
| Clearance | The maximum permissible radial clearance Smax is shown in Installation Dimensions, as a function of the operating pressure and functional diameter. |
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:
PQM in PS8WM
All round material for light to heavy hydraulic applications with linear, movements in mineral oils, flame retardant hydraulic fluids, phosphate ester, bio-oils or fluids having low lubricating properties:
| O-Ring and X-Ring: | NBR 70 Shore A | N |
| FKM 70 Shore A | V | |
| Set Code | PS8WMN or PS8WMV |
PQM in PS61B
For medium to heavy applications with linear movements in mineral oils and other media with good lubrication:
| O-Ring and X-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 PQM.
Materials for PQM
Installation Dimensions - Standard Recommendations
| Series No. | Bore Diameter DN H9 | Groove Diameter | Groove Width | |
| Standard Application | Light Application | d1 h9 | L1 +0.2 | |
| PQM | 15 - 39.9 | 40 - 79.9 | DN - 11.0 | 4.2 |
| PQM | 40 - 79.9 | 80 - 132.9 | DN - 15.5 | 6.3 |
| PQM | 80 - 132.9 | 133 - 252.9 | DN - 21.0 | 8.1 |
| PQM | 133 - 252.9 | - | DN - 24.5 | 8.1 |
| Series No. | Radius | Radial Clearance Smax | O-Ring Cross Section | X-Ring Cross Section | ||
| r1 max | 10 MPa | 20 MPa | 40 MPa | d2 | W | |
| PQM | 1.0 | 0.25 | 0.15 | 0.10 | 3.53 | 1.78 |
| PQM | 1.3 | 0.30 | 0.20 | 0.15 | 5.33 | 1.78 |
| PQM | 1.8 | 0.30 | 0.20 | 0.15 | 7.00 | 2.62 |
| PQM | 1.8 | 0.30 | 0.20 | 0.15 | 7.00 | 2.62 |
Ordering Guide
PPQM complete with X-Ring and O-Ring standard application:
| Series | PQM |
| Bore Diameter | DN = 80.0 mm |
| TMK Part No. | PQM0800081 |
PQM 0800 081 PS8WM N
1 2 3 4 5
| 1 | TMK Series No. |
| 2 | Bore Diameter x 10 |
| 3 | Groove Width x 10 |
| 4 | Material Code ( Seal Ring ) |
| 5 | Material Code ( O-Ring ) |
