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Ari-Armaturen seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mechanical seals".

Ari-Armaturen seal operating principle

A mechanical seal is a shaft sealing device that achieves leak prevention by maintaining contact between one or more pairs of end faces sliding relative to each other perpendicular to the axis, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, supplemented by auxiliary seals. The common mechanical seal structure consists of components such as the stationary ring (static ring), rotating ring (dynamic ring), elastic element spring seat, set screws, rotating ring auxiliary O-ring, and stationary ring auxiliary O-ring. Anti-rotation pins are fixed to the gland to prevent the stationary ring from rotating. The rotating ring and stationary ring may also be referred to as compensating rings or non-compensating rings, depending on whether they possess axial compensation capability.

Ari-Armaturen seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were stuffing boxes designed for soft packing seals. They are unsuitable for housing mechanical seals, not only due to their small size and narrow clearances, but also because the simple cylindrical shape is inappropriate. International standards for enlarged mechanical seal chambers have been established. Furthermore, companies such as Durametallic in the United States and the Fluid Engineering Study Group in the United Kingdom are researching rational mechanical seal chamber designs. These designs should not only facilitate fluid flow and heat dissipation but also aid in the removal of solid particles, creating a favorable environment for the seal. 2) Fugitive emission control system: Previously, attention was focused only on eliminating visible fluid leaks, neglecting the control of invisible fugitive emissions. This has led to environmental pollution and posed risks to equipment and personnel. International bodies, such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States, have established guidelines for controlling fugitive emissions from rotating machinery, compressors, and screw systems equipped with mechanical seals, including SP-30 (1994), SP-32 (1990), and SP-33 (1991). SP-30 is implemented in three phases. It clearly defines barrier fluids and buffer fluids, clarifying erroneous and confusing concepts. A barrier fluid is introduced between dual seals to completely block process fluid from leaking into the surrounding environment. The pressure of the barrier fluid is always higher than that of the sealed process fluid. A buffer fluid serves as a lubricant or cushion between dual seals, and its pressure is always lower than that of the sealed process fluid. 3) Auxiliary system integration: Mechanical seal auxiliary systems require integration of cooling, heating, and flushing systems. Pump circulation needs optimization, and condition monitoring systems are being studied and resolved. The API-682 standard specifies requirements for auxiliary system integration. 4) Gas barrier seal system: In the past, liquid-blocking-liquid or liquid-blocking-gas configurations were common in barrier seal systems. To simplify bulky barrier liquid systems, barrier gases are now used to block liquids or gases. Gas barrier seal systems may employ spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods to block gases and liquids.

Ari-Armaturen seal installation and shutdown

1) Before startup, ensure the seal chamber is filled with liquid. When transporting media that solidify, use steam to heat the seal chamber to melt the media. Manual rotation (barring) must be performed before startup to prevent sudden startup from causing fracture of the soft ring. 2) For mechanical seals utilizing an external seal oil system, start the seal oil system first. After shutdown, stop the seal oil system last. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components.

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