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Equivalent to:
● John Crane Type 21
Operating Limits:
● Temperature: -30℃ - +120℃
● Pressure：≤ 10bar
● Speed: ≤ 15m/s
● Shaft size: 0.5” - 3”
Materials:
● Seal Rings: A,B,Q1/12,Q2/22, U1/12,U2/22
● Elastomer: VITON, EPDM, NBR
● Metal Part: SS304
Assembly Dwg:
Dimensions (mm):
| D1 | D3 | D7 | L1 | L2 |
| 0.5 | 23.9 | 25.4 | 20.62 | 7.93 |
| 0.625 | 26.7 | 31.75 | 22.22 | 10.28 |
| 0.75 | 31.1 | 34.93 | 22.22 | 10.28 |
| 0.875 | 33.4 | 38.1 | 23.8 | 10.28 |
| 1 | 43.2 | 41.28 | 25.4 | 11.1 |
| 1.125 | 46.3 | 44.44 | 26.97 | 11.1 |
| 1.25 | 49.4 | 47.63 | 26.97 | 11.1 |
| 1.375 | 52.6 | 50.8 | 28.58 | 11.1 |
| 1.5 | 55.8 | 53.98 | 28.58 | 11.1 |
| 1.625 | 62.2 | 60.33 | 34.93 | 12.7 |
| 1.75 | 66 | 63.5 | 34.93 | 12.7 |
| 1.875 | 66.6 | 66.68 | 38.1 | 12.7 |
| 2 | 73 | 69.85 | 38.1 | 12.7 |
| 2.125 | 73.3 | 76.2 | 42.88 | 14.28 |
| 2.25 | 78.4 | 79.38 | 42.88 | 14.28 |
| 2.375 | 82 | 82.55 | 46.02 | 14.28 |
| 2.5 | 84.9 | 85.73 | 46.02 | 14.28 |
| 2.625 | 88.4 | 85.73 | 49.2 | 15.9 |
| 2.75 | 92.6 | 88.9 | 49.2 | 15.9 |
| 2.875 | 94.85 | 95.25 | 52.37 | 15.9 |
| 3 | 101.9 | 98.43 | 52.37 | 15.9 |
*Related Introduction*
Requirements for mechanical seals in engineering applications:
(1) Reliable sealing and less leakage. Most of the materials produced in petrochemical and chemical industries are flammable, flammable, and explosive materials. Leakage will not only cause economic losses, but also cause personal poisoning and environmental pollution. Therefore, it is required that the sealing of the seals must be reliable, have a small amount of leakage, and be reliable. Sure.
(2) Seals must have a certain service life. In order to ensure continuous production and reduce costs, seals must have a certain service life, and the general service life should be at least one production cycle (more than one year).
(3) Corrosion resistance. Most of the petrochemical and chemical production are corrosive media. Corrosion will reduce the service life and reduce the processing accuracy and sealing performance of the seal surface. Therefore, the seal must be resistant to the corrosion of the medium.
(4) Easy to install and adjust. This is even more important in terms of the current technical level of maintenance personnel in the enterprise. Sometimes the maintenance personnel are not familiar with the new technology and fail to achieve the expected results.
(5) There are various types of seals, which are easy to select. In order to meet the various requirements of industrial production for sealing, there should be a combined sealing structure with multiple structures, multiple materials, or multiple sealing combinations.
(6) The price is cheap. Any seal can be easily promoted and applied in production at a low price. Since most of the sealing parts are vulnerable parts, it should be ensured that they are interchangeable to realize the generalization, standardization and serialization of parts.
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