(1) Shaft diameter: The shaft diameter of the pump mechanical seal is generally 6 ~ 200mm, special up to 400mm, the pump shaft diameter is usually determined by the strength requirements, by the round or use sleeve modulation to meet the mechanical seal standards Shaft diameter. (2) Speed: generally the same speed with the pump, - general centrifugal pump speed ≤ 3000r / ming high-speed centrifugal pump ≤ 8000r / mini. Special pump ≤ 4000r / min. (3) sealing surface average circumferential speed: refers to the circumferential surface of the average diameter of the seal line speed. Sealing surface average linear velocity, the sealing surface (ie friction pair) heat and wear a greater impact. General mechanical seal circumferential line speed ≤ 30m / si Application of spring static mechanical seal circumferential line speed ≤ lOOm / s special up to ≤ 150m / s, (4) End pressure: the end of the turbulent pressure for a long time is the sealing surface The contact pressure (MPa). End face seal than the pressure should be controlled within a reasonable range, too small will reduce the sealing performance, over the Assembly to intensify the sealing surface heating and wear. Pump mechanical seal frustum end of the song than the pressure value; built-in mechanical seal, generally take a long = 0.3 ~ 0.6MPaf external type, sigh for a long = 0.15 ~ 0.4MPa. Lubricity is better when the end surface pressure increases properly, the larger the glaze liquid should increase the end surface pressure, desirable long = O. 5 ~ 0.7MPai volatile, hair, poor lubrication should be taken liquid Small end pressure, desirable for a long = O 3 ~ 0 45MPa
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