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QUAD-RING® Seals for Rotary Applications With Oil

Rotary Seal Considerations

Four-lobed seals should operate in a packing gland with a maximum diametrical clearance of .004 (.102mm) and a maximum pressure of 750 PSI (52 Bar). There must be a minimum constant pressure of at least 20 PSI to lubricate the seal. The seal should be located as far as possible from the liquid being sealed to minimize heat build-up on the seal.

Peripheral Compression

The inside diameter of a free, uninstalled, four-lobed seal should always be larger than the shaft. After installation, the inside diameter should be small enough to provide the squeeze necessary for sealing. This is due to the Joule effect of a rotary application.

Shaft Speed

Whenever a choice exists, seal on the smallest diameter of the shaft, to minimize friction and reduce surface speed. The following recommendations are for shaft speeds of 50-900 FPM (15.2-274.3 M/Min). Shaft speeds of less than 50 FPM (15.2 M/Min) should be treated as reciprocal applications.

FPM = (Shaft diameter x 3.14 x RPM) / 12
M/Min = Shaft diameter (in meters) x 3.14 x RPM

Surface Finish

Surface finish in the groove should be 63-85 RMS (1.62.16µm), and 20-24 RMS (.5-.6µm) on the shaft.

Materials

Our Compounds 525K and 525L are recommended for rotary applications. These nitrile formulations offer excellent abrasion resistance and are compatible for use with most hydraulic fluids. 525K is generally used in applications to 300 PSI (20.7 Bar), while 525L is preferred for pressures of 300-750 PSI (20.7-51.7 Bar). For applications involving special fluids or extreme operating conditions, contact our Product Design Group.

Specialized Seals for Demanding Applications

Each rotary application is unique, often involving media other than oil, or extreme conditions of temperature, pressure, or friction. Special seals are available to meet these demanding requirements. Contact your Pressure Seals representative for more information.


Recommended Starting Dimensions for Rotary Applications

Shaft Diameter Cross-section Grove Diameter Axial Groove
Length
(in.) (mm) Four-lobed
Seal No.
(in.) (mm) (in.) (mm) (in.) (mm)
.125 3.175 Q4007 .707 1.778 .260/.258 6.604/6.553 .085/.080 2.159/2.032
.156 3.962 Q4008 .070 1.778 .292/.290 7.417/7.366 .085/.080 2.159/2.032
.188 4.775 Q4009 .070 1.778 .323/.321 8.204/8.153 .085/.080 2.159/2.032
.218 5.537 Q4010 .070 1.778 .355/.353 9.017/8.966 .085/.080 2.159/2.032
.250 6.350 Q4011 .070 1.778 .385/.383 9.779/9.728 .085/.080 2.159/2.032
Call   Q4012            
.312 7.925 Q4110 .103 2.616 .513/.511 13.030/12.979 .115/.110 2.921/2.794
.375 9.525 Q4111 .103 2.616 .576/.574 14.630/14.579 .115/.110 2.921/2.794
.437 11.100 Q4112 .103 2.616 .636/.638 16.154/16.205 .115/.110 2.921/2.794
.500 12.700 Q4113 .103 2.616 .701/.699 17.805/17.754 .115/.110 2.921/2.794
.562 14.275 Q4114 .103 2.616 .763/.761 19.380/19.329 .115/.110 2.921/2.794
.625 15.875 Q4115 .103 2.616 .826/.824 20.980/20.929 .115/.110 2.921/2.794
.750 19.050 Q4117 .103 2.616 .951/.949 24.155/24.104 .115/.110 2.921/2.794
.812 20.625 Q4118 .103 2.616 1.013/1.011 25.730/25.679 .115/.110 2.921/2.794
.875 22.225 Q4119 .103 2.616 1.076/1.074 27.330/27.280 .115/.110 2.921/2.794
1.000 25.400 Q4121 .103 2.616 1.201/1.199 30.505/30.454 .115/.110 2.921/2.794
1.062 26.975 Q4122 .103 2.616 1.263/1.261 32.080/32.029 .115/.110 2.921/2.794
1.125 28.575 Q4123 .103 2.616 1.326/1.324 33.680/33.630 .115/.110 2.921/2.794
1.187 30.150 Q4124 .103 2.616 1.388/1.386 35.255/35.204 .115/.110 2.921/2.794
1.250 31.750 Q4125 .103 2.616 1.451/1.449 36.855/36.804 .115/.110 2.921/2.794
1.312 33.325 Q4126 .103 2.616 1.513/1.511 38.430/38.379 .115/.110 2.921/2.794
1.375 34.925 Q4127 .103 2.616 1.576/1.574 40.030/39.979 .115/.110 2.921/2.794
1.500 38.100 Q4129 .103 2.616 1.699/1.701 43.154/43.205 .115/.110 2.921/2.794
1.750 44.450 Q4133 .103 2.616 1.951/1.949 49.555/49.504 .115/.110 2.921/2.794
2.000 50.800 Q4137 .103 2.616 2.202/2.199 55.930/55.854 .115/.110 2.921/2.794

To calculate groove diameter for shaft sizes not listed, select the Series 4 seal with an I.D. one size larger than the shaft in question. Start with a minimum shaft diameter. Add to that two times the minimum cross-section of the seal, and subtract .002 (.05mm) for tolerance.

Example: QUAD-RING seal cross-section of .139±.004 (3.53±.10mm) and shaft diameter of 1.118±.001 (28.4±.025mm).

These calculations are for hydraulic and lubrication oils only. For other media such as air or water, or for larger sizes, contact one of our Product Engineering Teams.

Information Provided by Minnesota Rubber/Quadion Corporation, copyright 2002
® Product names are Registered trademarks of Minnesota Rubber, A Quadion Company.