VG Oil Seal Springless Single Lip Rotary Shaft Seal for Low Pressure Lubrication

Structure Features

• Single lip, no garter spring. Sealing relies on the elastic force of the rubber lip to contact the shaft surface.
• Rubber covered outer diameter with ribbed / corrugated surface. Suitable for aluminum housings with large thermal expansion. The corrugated outer OD compensates housing thermal expansion to maintain static sealing at outer circle.
• Built-in metal skeleton to keep roundness and stable installation dimension.

Common Materials

• NBR (standard, mostly green, 70~90 Shore A): mineral oil, grease. Temperature range: -30 ~ +120°C
• FKM / Viton: high temperature & chemical resistance. Temperature range: -20 ~ +200°C
• Optional: HNBR, ACM, EPDM, VMQ (Silicone)

Operating Parameters (Standard VG)

• Pressure: ≤0.3 bar (zero pressure / low pressure for oil bath & grease only). Not for high pressure service.
• Surface speed: ≤5~10 m/s (depends on material)
• Compatible media: engine oil, gear oil, grease, some synthetic lubricants. Not suitable for strong solvents, concentrated acid & alkali.

Applications

1. Low pressure lubrication system, grease sealing
2. Aluminum housing motors, reducers, small gearboxes. Corrugated OD compensates thermal expansion of aluminum housing.
3. Secondary sealing position, limited installation space for rotary shaft; oil retention + light dust exclusion
4. Brands: SOG, NAK, DIC supply VG / VG1 series. VB, VC are sibling springless seal types.

Advantages & Disadvantages

• No spring, lower friction & less heat generation
• Corrugated outer diameter prevents outer leakage when aluminum housing expands under temperature change
• Compact structure, lower cost than TC spring oil seal

• Lip preload is weaker than TC spring-loaded seal. Not recommended for high pressure, heavy dust or high speed severe conditions.
• Poor compensation after lip wear; shorter service life under harsh working conditions vs TC seal.

Comparison: VG vs TC Oil Seal

Selection Tips

1. Part marking: ID × OD × Thickness, example: VG 12×21×3
2. VG is preferred for aluminum housing with large temperature variation. TC/SC for heavy dust, high shaft speed or higher pressure.
3. Designed for rotary dynamic sealing only, NOT for reciprocating hydraulic sealing.