German bw seals seals bw seals models bw seals prices

bw seals seals are typical representatives of oil seals; generally, the term oil seal 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 internally covered skeleton oil seals, externally 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.

bw seals seals 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 shaft, in contact under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, supplemented by auxiliary seals. The common mechanical seal structure consists of components such as a stationary ring (static ring), rotating ring (dynamic ring), elastic element spring seat, set screws, rotating ring auxiliary sealing ring, and stationary ring auxiliary sealing ring. An anti-rotation pin is fixed to the gland 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 possess axial compensation capability.

bw seals seals system composition

1) Gland housing: In the past, gland housings for mechanical seals were stuffing boxes designed for soft packing seals. They are unsuitable for mechanical seals, not only because they are too small and have too narrow clearances, but also because their simple cylindrical shape is inappropriate. International standards for enlarged gland housings for mechanical seals have been established. Furthermore, Durametallic Corporation in the United States and the Fluid Sealing Association (formerly part of the Fluid Engineering Study Group) in the United Kingdom are researching rational gland housing designs for mechanical seals. Their shapes should not only facilitate fluid flow and heat dissipation but also aid in the removal of solid particles, thereby creating a favorable environment for the seal. 2) Volatile emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while invisible volatile emissions were neglected. This has led to environmental pollution and posed hazards to equipment and personnel. Internationally, guidelines for controlling volatile emissions from rotating machinery, compressors, and screw systems equipped with mechanical seals have been established by the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States, covering SP-30 (1994), SP-32 (1990), and SP-33 (1991). The implementation of SP-30 is carried out 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 that of the sealed process fluid. A buffer fluid serves as a lubricant or cushioning agent between dual seals, and its pressure is always lower than that of the sealed process fluid. 3) Supporting auxiliary systems: Auxiliary systems for mechanical seals require supporting components for cooling, heating, flushing, and other functions. Pump circulation needs optimization, and issues such as condition monitoring systems are being studied and resolved. The supporting requirements for auxiliary systems are specified in the API-682 standard. 4) Gas barrier seal system: In the past, liquid barriers were commonly used to seal liquids or gases in barrier seal systems. To simplify bulky liquid barrier systems, gas barriers are now employed to seal liquids or gases. Gas barrier seal systems may utilize spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other configurations to seal gases and liquids.

bw seals seals installation technical requirements

Mechanical seals are high-precision mechanical components, and correct installation and operation significantly impact their service life. We generally follow the standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the mating parts of the mechanical seal are as follows: 1) Shaft bending: Maximum not greater than 0.05 mm; 2) Rotor runout: Near the shaft sleeve at the dynamic ring sealing ring location, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, the shaft sleeve must not be loose; 4) Coupling alignment error: For gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (conventional practice face runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm; perpendicularity tolerance of the surface contacting the gasket relative to the centerline is 0.03–0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring sealing ring is installed, and the ends of the gland (or housing) where the static ring sealing ring is installed, should be chamfered and smoothed. 7) Exercise care during installation and removal of mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging seal components. If scaling prevents removal, clean thoroughly before attempting removal again. 8) If mechanical seals are used at both ends of the pump, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the stationary and rotating ring components must be replaced and should not be re-tightened for continued use. This is because loosening alters the original running track of the friction pair, easily compromising the sealing integrity of the contact surfaces.

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