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Type 28VL

Type 28VL
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Non-Contacting, Vaporizing Liquid Seal – Seat/Mating Ring – Face/Primary Ring – Spring – Retainer – Gland Spiral Groove Face Product Description Utilizing proven spiral groove technology, the Type 28VL harnesses the rotational energy of the pump shaft to vaporize the process fluid at a controlled rate, creating a stable gas film that lubricates the seal faces. s Typical problems, such as dry-running wear, vapor lock in the seal chamber, and “face popping” (which can lead to catastrophic failure of conventional wet seals), are eliminated by the Type 28VL non-contacting seal technology. For use on pumps where the process fluid is at or near its point of vaporization. Pressure: Up to 124 bar g/1800 psig per seal face End Play/Axial Float Allowance: ±3.175mm/0.125" *For applications exceeding the standard design conditions, consult John Crane. Extended Wear Life Outstanding Reliability Reduced Power Consumption Zero Process Contamination Reduced Emissions Options Available

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TYPE 28VL Non-Contacting, Vaporizing Liquid Seal Type 28VL Single Typical Arrangement/Dimensional Data Type 28VL Tandem Typical Arrangement/Dimensional Data

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TYPE 28VL Non-Contacting, Vaporizing Liquid Seal Type 28VL Dimensional Data (mm) Type 28VL Dimensional Data (inches) Smaller cross-section seals and seals for larger shaft diameters are available. Contact John Crane. Smaller cross-section seals and seals for larger shaft diameters are available. Contact John Crane.

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TYPE 28VL Non-Contacting, Vaporizing Liquid Seal Materials of Construction SEAL COMPONENTS Face/Primary Ring Seat/Mating Ring Tungsten Carbide Silicon Carbide Coatings on Ductile Substrates Retainer* Disc* Drive Band* Alloy C-276 (UNS N10276) Alloy B-2 Alloy 20CB3 SS Monel® Inconel® X-750 316 Stainless Steel Nitrile Silicone Fluorosilicone Aflas® Kalrez® Neoprene® Ethylene Propylene Spring-Energized Polymers Alloy 20CB3 SS Alloy B-2 Monel Inconel X-750 316 Stainless Steel *NACE #MR-01-75 compliant materials are available. Monel and Inconel are registered trademarks of Inco Alloys...

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