General Comments and Useful Tables
PRESSURE CONVERSION FORMULAE:
| 1 BAR = 14.500 PSI | 1 KPa = 0.0100 BAR |
| 1 BAR = 100.00 KPa | 1 KPa = 0.1450 PSI |
| 1 BAR = 1.0193 KG/CM2 | 1 KPa = 0.0102 KG/CM2 |
| 1 PSI = 0.0690 BAR | 1 KG/CM2 = 0.9810 BAR |
| 1 PSI = 6.8966 KPa | 1 KG/CM2 = 14.225 PSI |
| 1 PSI = 0.0703 KG/CM2 | 1 KG/CM2 = 0.0098 |
FRICTION INFORMATION
The use of PTFE seals can lower friction; wear; improve motion etc, but the measurement of friction is related to several factors such as hardware finish/ hardware material/ temperature/ lubrication etc.
As a guide only, and using the average value of spring load for designated seal design, the following formula may be used:
| Friction Torque (N/mm) = 3.142µ.F.D2/2 | Where F=Spring Load |
| D=Diameter of Dynamic Surface | |
| Linear Friction (N) = 3.142µ.F.D | µ = Coefficient of friction for jacket material |
AVERAGE SPRING LOADS:
Seal Type
- M01 4.6 N/mm of circumference
- M20 1.4 N/ mm of circumference
We hope you have found our website interesting. If you are undecided in the choice of seal or materials, then please contact us for advice, giving full details of the application demands. As a rule of thumb, the following general comments may be considered:
- Wherever possible, use the largest seal selection possible
- Decide how the seal will be assembled
- Make sure the surface finishes required for the application are attainable and how they can be achieved (particularly important for cryogenic applications)
- The material selection chart contains useful information regarding jacket/slipper choice in respect of running surface hardness for dynamic applications
- Imperial sizes can be manufactured
