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JOHN CRANE MECHANICAL SEALS |
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 John Crane 2800 - Gas
Lubricated, Non-contacting Cartridge Double Seal For Pumps
Patented John Crane spiral grooves are machined into the mating ring
faces. A pressurized suitable inert gas is injected between the
seals
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As the shaft rotates, gas flows into the tip of the spiral groove and is compressed at the sealing dam, the ungrooved portion of the mating ring. At the sealing dam, gas is expanded.
The resultant film pressure gives an opening force greater than the closing force, thus separating the faces. The Type 2800 spiral groove continues to operate, even if barrier gas pressure is momentarily lost, maintaining the gas film between the barrier gas and the process.
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Quick specs
| Temperature |
-40° F to +500° F
-40° C to +260° C |
| Pressure |
To 300 psig/21 barg |
| Speed |
To 50 m/s |
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Features
Type 2800 Series Seals Give You Proven Performance John Crane proprietary computer programs assure optimal design of critical components for peak performance, and accurately predict that performance.
The prediction is based on analysis of the combined effects of pressure, temperature, fluid sealed and friction on the
distortion, and temperature distribution.
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