Product Overview;
The LS791 Rotary Shaft Lip Seal is a compact, contact‑type radial shaft sealing solution designed to retain lubricants and exclude external contaminants in rotating machinery. The flexible sealing lip maintains controlled radial contact with the shaft, providing effective protection against oil, grease, dust, splash water, and process‑area contamination in general industrial service.
Engineered for RAV (Rotary Airlock Valve), pumps, mixers, agitators, gearboxes, conveyors, and other rotary equipment, the LS791 is suitable for moderate‑speed and low‑pressure applications across chemical, oil & gas, mining, cement, power, water treatment, and pulp & paper environments. Depending on the selected elastomer and hardware configuration, the seal can be adapted for mineral oils, grease lubrication, dirty atmospheres, mildly aggressive fluids, and abrasive industrial surroundings.
The Gipfel Rotary Shaft Lip Seal is a robust cartridge-type sealing solution designed for rotating equipment. The pre-assembled cartridge construction simplifies installation and replacement on pumps, gearboxes, mixers, and conveyors. The seal utilizes a PTFE sealing lip energized by elastomeric O‑rings, providing excellent chemical resistance, low friction, and reliable sealing performance. Its modular cartridge housing ensures proper alignment and simplifies maintenance operations. This design is particularly suitable for slow‑to‑moderate‑speed applications, abrasive environments, and industries where equipment downtime must be minimized.
Technical Key features;
- Reduced maintenance time and cost due to the modular cartridge layout.
- PTFE sealing lip provides low friction and excellent chemical resistance, especially in aggressive or dirty environments.
- O‑ring‑energized sealing element improves contact force consistency and overall sealing reliability under varying conditions.
- Flexible sealing lip geometry maintains stable contact under normal shaft runout and vibration, improving sealing consistency.
- Compact radial shaft design for easy installation in standard seal housings and bearing covers, simplifying fit‑up and replacement.
- Cartridge construction ensures correct alignment and concentricity with the shaft, simplifying installation and repeat replacements.
- Suitable for abrasive and slurry environments where simple but robust radial sealing is required to protect bearings and gear systems.
- Compatible with standard industrial shaft tolerances and common sealing grooves, easing integration into existing equipment designs.
- Suitable for OEM and retrofit use in pumps, conveyors, mixers, agitators, and gear reducers, supporting both new‑build and upgrade programs.
- Contaminant exclusion against dust, dirt, splash water, and external process debris, enhancing bearing and gearbox life in industrial environments.
- Effective lubricant retention for oil‑ and grease‑lubricated bearings, gearboxes, and rotating shafts, helping to maintain proper lubrication and reduce leakage.
- Cost‑effective maintenance solution for rotary equipment where mechanical seals are not required, providing reliable protection at lower life‑cycle cost.
- Multiple elastomer options, including NBR, FKM, EPDM, and PTFE, to achieve broad chemical and temperature compatibility across a wide range of services.
Service Overview;
| Parameter | Value |
| Equipment | RAV (Rotary Airlock Valve), centrifugal pumps, slurry pumps, mixers, agitators, conveyors, gearboxes, rotary equipment |
| Fluid | Fine powder, lubricating oil, grease, splash water, dirty water, mild chemicals, process-area contaminants |
| Service Nature | Low-pressure rotary shaft sealing, lubricant retention, dust and splash exclusion |
| Operating Mode | Continuous or intermittent rotation in horizontal or vertical shaft arrangements |
Specifications;
| Item | Min | Max | Typical / Notes |
| Size | 40 mm / 1.500” | 300 mm / 12.000” | Larger sizes available on request |
| Pressure | — | 0.5 bar (7 psi) | Application dependent |
| Temperature | -20°C (-4°F) | +200°C (+392°F) | Depends on O-ring material: FKM, NBR, EPDM |
| Speed | — | 10 m/s (1,970 fpm) | Depends on shaft diameter, finish, and lubrication |
Materials;
| Component | Standard Material | Optional Material | Comment |
| Sealing Lip | PTFE | Filled PTFE | Low friction and excellent chemical resistance |
| Housing | SS 316 | Carbon Steel | Cartridge housing for correct alignment and concentricity |
| Energising O-Rings | FKM (Viton) | Nitrile (NBR), EPDM | Energise the PTFE lip; set the temperature limit |
Applications;
- Industrial gearboxes and gear reducers
- Conveyors and bulk material handling equipment
- Mixers and agitators in chemical and process plants
- Oil & gas auxiliary equipment and lubrication systems
- Water treatment and wastewater handling equipment
- Pulp & paper machinery and process rotating assemblies
- Slurry pumps requiring external dust and splash protection
- Rotary equipment used in cement, mining, and power plants
- Centrifugal pumps for water, chemicals, and general process duties
- Pharmaceutical production equipment and process machinery, including mixers, dryers, and filling lines
- Fine‑powder handling systems and powder‑transfer equipment where dust exclusion and contamination control are critical
- Food‑grade powder‑handling and processing equipment (e.g., blenders, mixers, conveyors serving edible powders), when configured with FDA‑compliant or food‑grade elastomers and compatible hardware
Operating Limits;
| Parameter | Value |
| Pressure | Up to 0.5 bar (7 psi) |
| Temperature | -20°C to +200°C (-4°F to +392°F), O-ring dependent |
| Speed | Up to 10 m/s (1,970 fpm), application dependent |
| Size Range | 40 mm to 300 mm / 1.500” to 12.000” (inch series); custom sizes on request |
