![]() |
![]() |
![]() |
![]() ![]() |
Standard Lip Seals | ||||
Cross Section | Type | Application | Shaft Surface Speed (m/min) |
Shaft Size Range Inches(mm) |
![]() | ||||
![]() | LUP | General Purpose. | Thru 3200 FPM (976) |
5/8"-60" (16-1524) |
![]() | ||||
![]() | LPD Without Spring Retainer | General Purpose. | Thru 3200 FPM (976) |
5/8"-60" (16-1524) |
![]() | ||||
![]() | LPD With Spring Retainer | General Purpose. | Thru 3200 FPM (976) |
5/8"-60" (16-1524) |
![]() | ||||
![]() | MIST | Heavy Duty Steel Mill Roll Neck Bearing Service. Steel bands offer greater retention in the bore. Molded in spring eliminates spring dumping. | Thru 3200 FPM (976) |
5"-50" (127-1270) |
![]() | ||||
![]() | RUP | General Purpose. Split design. | Thru 2000 FPM (610) |
1-5/16"-60" (33-1524) |
![]() | ||||
![]() | RPD | General Purpose. Split design. | Thru 2000 FPM (610) |
1-5/16"-60" (33-1524) |
![]() | ||||
![]() | SS | General Purpose. Springless - for small flange dimensions. | Thru 2000 FPM (610) |
1/4"-6" (6-152) |
![]() | ||||
![]() | ST-LUP | Heavy Duty Steel Mill Roll
Neck Bearing Service. Steel bands offer greater retention in the bore. | Thru 3200 FPM (976) |
5"-50" (127-1270) |
![]() | ||||
![]() | ST-LPD | Heavy Duty Steel Mill Roll
Neck Bearing Service. Steel bands offer greater retention in the bore. | Thru 3200 FPM (976) |
5"-50" (127-1270) |
![]() | ||||
![]() | OL | Outside lip design. | Thru 1000 FPM (306) |
5/8"-50" (16-1270) |
Lip Seals Lip seals retain the oil inside the air end while keeping air, dust and dirt from entering along the rotating shaft when the machine is off load. Remember, when the inlet valve closes and the shaft continues to rotate, a vacuum may be pulled on the inlet end. Some lip seals are made of a high Nitrile Buna N or Viton rubber encased in steel and were designed to withstand only a few pounds of back pressure. Compressors with these lip seals rely on discharge valves, oil stop valves and a fast acting sump blow down valve to prevent the system pressure from slipping back up through stopped rotors and pressurizing the drive side. Rubber lip seals can not withstand high pressures. A leaky lip seal of this type may be an indicator of a bad check valve or oil stop valve which will allow full discharge pressure to reach the seal. The newer style of lip seals use Teflon ®. These are much stiffer and can withstand high pressure as well as synthetic compressor oils. In general, lip seals are more sensitive, than mechanical seals to shaft run-out and surface irregularities. A lip seal will often leak oil if the shaft has a total indicated run-out of more than only a few thousands of an inch. You can not assume that because the shaft runs true when spun by hand that it will do so at speed. Therefore, it is even more important that you check the radial or side play in the shaft before replacing a leaking lip seal. |
Call us at: 714-593-9780 Fax: 714-593-9701 |
Send mail to Company with
questions or comments about this web site.
Copyright © 2003 Steadman & Associates, Inc.
Teflon ® is a registered trade mark of E.I. du Pont de Nemours and Company. Only DuPont makes TEFLON® resin.