Germany Dopag seals Dopag model Dopag price

Dopag seals are a typical representative of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other parts.

Dopag seal principle

A mechanical seal is a shaft sealing device that achieves leak prevention by keeping one or several pairs of end faces, which slide relative to each other perpendicular to the axis, in contact 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, a rotating ring auxiliary sealing ring, and a stationary ring auxiliary sealing ring. An anti-rotation pin is fixed to the pressure cover to prevent the stationary ring from rotating. The rotating ring and stationary ring can also be referred to as compensation rings or non-compensation rings, depending on whether they have axial compensation capability.

Dopag seal system composition

1) Gland housing: In the past, gland housings used for mechanical seals were stuffing boxes designed for soft packing seals. They are not suitable 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 gland housings have been established abroad. In addition, Durametallic Corporation in the United States and the Fluid Sealing Association (formerly the British Hydromechanics Research Group) are studying rational mechanical seal gland housings. Their shapes should not only facilitate fluid flow and heat dissipation but also help remove solid particles, thereby creating a favorable environment for the seal. 2) Control system for fugitive volatile emissions: In the past, attention was focused only on eliminating visible fluid leaks, while control of invisible fugitive volatile emissions was neglected. This has resulted in environmental pollution and posed hazards to equipment and personnel. Abroad, for example, the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States has developed guidelines for controlling fugitive emissions from rotating machinery, compressors, and screw systems equipped with mechanical seals, covering 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 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 used between dual seals as a lubricant or cushioning agent; the pressure of the buffer fluid is always lower than the pressure of the sealed process fluid. 3) Supporting components for auxiliary systems: Auxiliary systems for mechanical seals require supporting components for cooling, heating, flushing, and other functions. Pump circulation needs to be optimized, and issues such as condition monitoring systems are being studied and resolved. The supporting components for auxiliary systems are specified in the API-682 standard. 4) Gas barrier seal systems: 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. In gas barrier seal systems, spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods can be employed to seal gases and liquids.

Dopag seal failure causes

Mechanical seal failures are generally identified only after phenomena such as abnormal leakage, abnormal wear, and abnormal torque appear. The causes of failure can be broadly categorized into the following four aspects: 1) Incorrect design and 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 machine operation.

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