German Wall seals Wall model Wall price

Wall seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearings of compressors or other fluid handling equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and hydrodynamic seals.

Wall seal principle

A mechanical seal is a shaft sealing device that achieves leak prevention by maintaining contact between one or more pairs of faces perpendicular to the shaft, which slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, supplemented by auxiliary seals. A common mechanical seal structure consists of a stationary ring (static ring), a rotating ring (dynamic ring), an elastic element spring seat, set screws, an auxiliary O-ring for the rotating ring, and an auxiliary O-ring for the stationary 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.

Wall 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 because the dimensions are too small and the clearances too narrow, but also because the simple cylindrical shape is inappropriate. Standards for enlarged mechanical seal chambers have been established abroad. In addition, Durametallic Corporation in the United States and the Fluid Engineering Study Group in the United Kingdom are researching rational mechanical seal chamber designs. Their shapes should not only facilitate fluid flow and heat dissipation but also help remove solid particles, creating a favorable environment for the seal. 2) Fugitive emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while ignoring the control of invisible fugitive emissions. This has led to environmental pollution and poses risks to equipment and personnel. Organizations abroad, such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States, have developed 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 stages. It clearly defines barrier fluids and buffer fluids, clarifying erroneous and confusing concepts. A barrier fluid is a fluid 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 the pressure of the sealed process fluid. A buffer fluid is a fluid used between dual seals as a lubricant or buffer; its pressure is always lower than the pressure of the sealed process fluid. 3) Auxiliary system integration: Auxiliary systems for mechanical seals require integration of cooling, heating, and flushing systems. Pump circulation needs optimization, and issues such as condition monitoring systems are being studied and resolved. The integration of auxiliary systems is specified in the API-682 standard. 4) Gas barrier seal system: In the past, liquid-blocking-liquid or liquid-blocking-gas configurations were commonly used 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.

Wall seal failure causes

Mechanical seal failures are generally identified only after phenomena such as abnormal leakage, abnormal wear, or abnormal torque occur. The causes of failure can be broadly categorized into the following four aspects: 1) Incorrect design or selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The precision of the machine using or installing the mechanical seal does not meet requirements; 4) Incorrect operation of the machine.

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