FXA stainless steel external lubrication pump seal type and use
Types and Usage of FXA Stainless Steel External Lubrication Pump Seals Causes of Leakage: 1. There is a gap in the sealing surface. Second, the sealing surface has a pressure difference. Since the design pressure and the use pressure of the stainless steel gear pump cannot be reduced objectively, the sealing of the stainless steel gear pump solves the problem of eliminating or reducing the gap between the sealing faces. FXA stainless steel " target=_blank> stainless steel external lubrication pump seal type and use of sealing leakage reasons:
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First, there is a gap in the sealing surface.
Second, the sealing surface has a pressure difference.
Since the design pressure and the use pressure of the stainless steel "target=_blank> stainless steel gear pump cannot be reduced objectively, the sealing of the stainless steel "target=_blank> stainless steel gear pump solves the problem of eliminating or reducing the gap between the sealing faces. Such gaps include gaps between the sealing faces and gaps within the body of the seal.
Type of seal:
One type is static seal and the other type is dynamic seal. Static seals are usually gasketed, O-ring sealed, and threaded.
Static seals are mainly gasket seals. When the temperature and pressure are not high, non-metallic gaskets are generally used. For medium-pressure high temperatures, Botaibang uses non-metal and metal gaskets. Non-metallic gaskets are most commonly used in stainless steel "target=_blank> stainless steel gear pumps. The materials are generally paper, rubber and Teflon. When the temperature does not exceed 120 ° C and the pressure is below 1.0 Mpa, the green shell is generally used. Paper or mold paper-making gasket. If the conveying medium is oil, the temperature is between -30 and 110 °C, generally the nitrile rubber with better aging resistance is used. When the conveying medium is at -50 to 200 °C, the fluororubber is used. Suitable. Because it is resistant to oil and heat, its mechanical strength is also its main feature. In chemical stainless steel "target=_blank> stainless steel gear pump, because the medium to be transported is corrosive, PTFE is generally used as a gasket. material.
Dynamic seals are mainly packing seals, oil seals, and mechanical seals. The packing seal is mainly graphite packing, the oil seal is graphite oil seal, the mechanical seal is dynamic, static ring, skeleton and spring. These three mechanical seals are the best, the price is high, the sealing performance is good, and the service life is long. The oil seal and the packing seal are relatively low in price and the sealing effect is poor. The mechanical seal has high requirements on the sealing end face. At the same time, in order to maintain the necessary lubricating liquid film between the sealing end faces, the pressure per unit area on the end face must be strictly controlled. The pressure is too large, and it is difficult to form a stable lubricating liquid film, which will accelerate the end face. Wear; the pressure is too small and the amount of leakage increases.
Therefore, in order to obtain good sealing performance and sufficient life, when designing and installing mechanical seals, it is necessary to ensure that the pressure per unit area of ​​the end face is in the most appropriate range.
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