Mechanical seal system composition

    Shaft seal box

    In the past, the shaft seal box containing mechanical seals was a stuffing box designed for soft packing seals. It is not suitable for holding mechanical seals. Not only is the size too small and the gap too narrow, but the simple cylindrical shape is also inappropriate.

    Foreign countries have formulated standards for enlarged mechanical seal shaft seal boxes. In addition, the American Duramitelek Company and the British Fluid Mechanics Research Group are studying reasonable mechanical seal shaft seal boxes. The shape should not only be conducive to fluid flow and heat dissipation, but also be conducive to the removal of solid particles, giving Sealing creates a good surrounding environment.

Volatile emission control

    In the past, only attention was paid to eliminating visible fluid leaks without paying attention to the control of invisible volatile escapes. This caused environmental pollution and was dangerous to the equipment and people. Foreign countries such as the Sealing Technical Committee of the American Society of Tribology and the Society of Lubrication Engineers have formulated SP-30 (1994), SP-32 (1990) and SP-33 (1991) for easy control of rotating machinery, compressors and screw systems with mechanical seals. Guidance on volatile emissions regulations. SP-30 is implemented in three phases. It clearly stipulates the definitions of blocking fluid and buffer fluid to clarify erroneous and confusing concepts. Blocking fluid is a fluid introduced between double seals that completely blocks the leakage of process fluid to the surrounding environment. The pressure of the blocking fluid is always higher than the pressure of the process fluid being sealed. Buffer fluid is a fluid used as a lubricant or buffer between double seals. The buffer fluid pressure is always lower than the pressure of the process fluid being sealed.

    Auxiliary system matching

    Among the auxiliary systems of the mechanical seal, there are cooling, heating, flushing and other systems that need to be matched, the pump cycle needs to be optimized, and issues such as the status monitoring system are being studied and solved. The matching of auxiliary systems is specified in the API-682 standard.

Gas blocking sealing system

    In the past, liquid blocking liquid or liquid blocking gas were commonly used in blocking sealing systems. In order to simplify the huge blocking liquid system, blocking gas is used to block liquid or gas blocking sealing systems. Spiral groove gas seals and blocking gases, floating sleeves and blocking gases, etc. can be used in blocking sealing systems. to block gases and liquids.