Mechanical Seals and Seal Support Systems
Mixer Seals - vra
About this product
The VRA is an outside mounted, dry-running single seal designed for use on top-entry agitator and mixer equipment. The contacting, dry-running design eliminates the need for a buffer fluid system, while handling run-out up to 3.81 mm (.0150 in) TIR.
Features and Benefits
- Self-lubricating carbon or filled PTFE seal face runs completely dry without cooling. Long life and reliability are achieved in the dry vapor space at the top of the mixer vessel while eliminating product contamination from liquid barrier fluids.
- Flexible rotor design compensates for shaft misalignment. Clearances, drive design, seal face dimensions, and o-ring configuration were optimized for the high run-out requirements of mixers and similar equipment. The VRA operates at eccentric run-out levels up to 3.81 mm (0.150 inch) TIR.
- Double o-ring mounted stator prevents distortion. Various configurations are available to fit different equipment types.
- Non-metallic collar option provides superior chemical resistance. Designated the VRA-C, a two-piece collar design eliminates the need for expensive exotic metal alloys in non-wetted areas.
- Optional sanitary gland allows steam cleaning and sterilizing of the seals interior while mounted on the equipment. Sanitary porting aids in the removal of steam cleaning debris.
Specifications
- Metal Components:
- 316 Stainless Steel
- Filled PTFE
- Rotating Face:
- Carbon
- Filled PTFE
- Stationary Face:
- Durachrome
- Tungsten Carbide
- Aluminum Oxide
- Gaskets:
- Fluoroelastomer
- Perfluoroelastomer
- EPR
- Springs:
- Alloy C-276
- Shaft Size:
- 25 to 178 mm (1.000 to 7.000″)
- Pressure:
- up to 13.8 bar (200 psi)
- Temperature:
- up to 149°C (300°F)
- Speed:
- up to 350 rpm
Configurations
- VRA – with Sanitary Gland
- VRA-C – with two-piece drive collar
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