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QUAD-RING® Seals for Non-Rotary
Applictions
Non-rotary Seal Groove
Design
- Minimum Cross-sectional Squeeze -Increasing the
squeeze generally results in a better seal. However, it also shortens seal
life. For dynamic low pressure situations, where shrinkage of material is not
anticipated, less squeeze may be used. For static or high pressure dynamic
applications, when friction is not a critical factor, more squeeze is
recommended.
- Groove Width - If exceptionally high swelling
of the packing material is anticipated, groove width "D" should be increased.
At pressures over 1500 psi (103.4 Bar), backup washers should be added to
prevent seal extrusion, and groove width should be increased by the thickness
of the washer.
- Radius - Maintain .005 - .015 (.127-.381mm)
radius at bottom of groove, and a maximum .005 (.127mm) radius on
corners.
- Static QUAD-RING Seals with wide variations in
squeeze and groove dimensions can be used with satisfactory results.
- Clearance - Refer to Clearance chart (section
4-2) to determine proper
diametrical clearance, based on the pressure encountered and the hardness of
the rubber compound.
Groove Design - Quad-Rings Without
Backup Washers
All surfaces and corners must be free of tool
marks, nicks or scratches.
- Refer to Clearance Chart (section
4-2) to determine proper
diametrical clearance based on the pressure encountered and the hardness of
the rubber compound.
- Bore Diameter "A" (at upper limit), minus two
times Groove Depth "C," equals Piston Groove Diameter "R."
A - (2 x C) =
R
Rod Diameter "G" (at lower limit), plus two times Groove Depth "C,"
equals Groove Diameter "F."
G = (2 x C) = F
- For backup washers, increase groove length "D"
by thickness of washers used. Use minimum radius in groove.
Recommended Starting Dimensions for
Non-Rotary Applications
| |
Actual Cross-Section |
Minimum C/S Squeeze |
Maximum "C" for
Minimum C/S Squeeze |
Groove "D" Axial
Dimen.
-.000/+.005in.
(-.000/+.127mm) |
Maximum Eccentricty Groove TIR |
| Seal Number |
(in) |
(mm) |
Dynamic
Static1
(in) |
Dynamic
Static2
(mm) |
Dynamic |
Static1
(in) |
Dynamic |
Static2
(mm) |
(in) |
(mm) |
(in) |
(mm) |
| Q4004-Q4050 |
.070 ± .003 |
1.780 ±
.076 |
.005 |
.010 |
.127 |
.254 |
.060/.062 |
.050/.057 |
1.524/1.575 |
1.397/1.448 |
.080 |
2.032 |
.002 |
.050 |
| Q4102-Q4178 |
.103 ± .003 |
2.616 ±
.076 |
.005 |
.010 |
.127 |
.254 |
.093/.095 |
.088/.090 |
2.362/2.413 |
2.235/2.286 |
.115 |
2.921 |
.002 |
.050 |
| Q4201-Q4284 |
.139 ± .004 |
3.530 ±
.101 |
.006 |
.012 |
.152 |
.304 |
.127/.129 |
.121/.123 |
3.226/3.276 |
3.073/3.124 |
.155 |
3.937 |
.003 |
.076 |
| Q4309-Q4395 |
.210 ± .005 |
5.334 ±
.127 |
.008 |
.016 |
.203 |
.406 |
.195/.197 |
.187/.189 |
4.953/5.004 |
4.750/4.800 |
.240 |
6.096 |
.004 |
.101 |
| Q4425-Q4475 |
.275 ± .006 |
6.985 ±
.152 |
.012 |
.024 |
.304 |
.609 |
.255/.257 |
.243/.245 |
6.477/6.528 |
6.172/6.223 |
.310 |
7.874 |
.005 |
.127 |
See chart for O-Ring groove
dimensions.
- In certain cases (e.g., very close control of
concentricities, absence of temperature extremes, etc.) tests may indicate
that the squeeze can be reduced (and seal life prolonged) by increasing the
groove diameter.
- For certain shaft sizes, use of the standard
size Series 4 seal may require more peripheral squeeze than is desired for the
application. In such cases, use of a special size Series 4 seal is
recommended. Contact our Fluid Delivery Team for details.
Information Provided by Minnesota Rubber/Quadion Corporation, copyright 2002
® Product names are Registered
trademarks of Minnesota Rubber, A Quadion Company.
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