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Type 28VL
4Pages

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Catalog excerpts

Type 28VL - 1

– Seat/Mating Ring – Face/Primary Ring – Spring – Retainer – Gland NON-CONTACTING, VAPORIZING LIQUID SEAL Technical Specification 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. • 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. Design Features • Extended wear life • Outstanding reliability • Reduced power consumption • Zero process contamination • Reduced emissions • Options available Performance Capabilities* • Temperature: -40˚C to 204˚C/-40˚F to 400˚F • Pressure: up to 124 bar g/1800 psig per seal face • Speed: up to 180 m/s / 590 ft./sec. • End play/axial float allowance: ±3.175mm/0.125" • Runout/out of squareness: 0.051mm/0.002" *For applications exceeding the stand

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Type 28VL - 2

TYPE 28VL NON-CONTACTING, VAPORIZING LIQUID SEAL Technical Specification Type 28VL Single Typical Arrangement/Dimensional Data Type 28VL Tandem Typical Arrangement/Dimensional Data

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Type 28VL - 3

TYPE 28VL NON-CONTACTING, VAPORIZING LIQUID SEAL Type 28VL Dimensional Data (inches) Technical Specification 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.

Open the catalog to page 3
Type 28VL - 4

TYPE 28VL NON-CONTACTING, VAPORIZING LIQUID SEAL Technical Specification 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. North America United States of America Tel:...

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