Rotary Shaft Lip Seal

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 Split Rotary Shaft Lip Seal is a robust cartridge‑type sealing solution designed for rotating equipment where conventional seals require difficult shaft disassembly. The split construction enables fast installation directly around the shaft without dismantling pumps, gearboxes, mixers, or 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 shaft‑in‑place installation and modular cartridge layout. 

• Split design enables installation without equipment or shaft dismantling, significantly reducing maintenance time. 

• 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	10 mm (0.394”)	300 mm (11.811”)	Larger sizes available on request
Pressure	Vacuum / atmospheric	0.5 bar (7 psi)	Up to 1 bar (15 psi) with supported lip design, application dependent
Temperature	-40°C (-40°F)	+200°C (+392°F)	Depends on elastomer: NBR, FKM, EPDM, PTFE
Speed	—	20 m/s (3,940 fpm)	Depends on shaft diameter, finish, lubrication, and lip material

 

Materials; 

Component	Standard Material	Optional Material	Comment
Sealing Lip	NBR	FKM, EPDM, PTFE	Select based on oil, chemical, temperature, and abrasion resistance
Case / Outer Shell	Carbon Steel	SS 304, SS 316	Stainless steel recommended for corrosive or washdown environments
Spring	Carbon Steel	SS 304, SS 316	Garter spring maintains radial lip loading
Dust Lip	NBR	FKM, PTFE	Optional secondary lip for abrasive or dusty service

 

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); up to 1 bar (15 psi) with supported design
Temperature	-40°C to +200°C (-40°F to +392°F), material dependent
Speed	Up to 20 m/s (3,940 fpm), application dependent
Size Range	10 mm to 300 mm (0.394” to 11.811”); custom sizes on request

 

Engineering Note; 

LS791-specific dimensional data, lip profile, pressure rating, and material coding were not supplied. The above operating limits are industry-standard inferred values for rotary shaft lip seals and should be verified against final engineering drawings, shaft finish, runout, lubricant type, and operating temperature before release.