Germany WERTHENBACH seals WERTHENBACH models WERTHENBACH prices

WERTHENBACH seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation maintaining contact and sliding 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. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. It mainly consists of the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or fixing screws.

WERTHENBACH 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 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 can also be referred to as compensation rings or non-compensation rings depending on whether they have axial compensation capability.

WERTHENBACH 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 Sealing Association in the United Kingdom are studying reasonable 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, resulting in environmental pollution and posing risks to equipment and personnel. Abroad, organizations such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers in the United States have developed guidelines for controlling fugitive emissions from rotating machinery, compressors, and screw systems 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 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 buffer, and its pressure is always lower than the pressure of the sealed process fluid. 3) Supporting auxiliary systems: Auxiliary systems for mechanical seals require supporting components for cooling, heating, flushing, etc. Pump circulation needs optimization, and issues such as condition monitoring systems are being researched 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 barrier liquid systems, barrier gases are now used to seal liquids or gases. Spiral groove gas seals with barrier gases, floating bushings with barrier gases, etc., can be employed to seal gases and liquids.

WERTHENBACH seal precautions

1) Shaft speed: Due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals. Low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: In high-temperature operating conditions, polyacrylate, silicone, fluorine, or fluoro-silicone rubber should be selected. Measures should be taken to reduce the oil temperature in the tank. In low-temperature operating conditions, cold-resistant rubber should be selected. (3) Pressure: General oil seals have poor pressure resistance; excessive pressure will cause deformation. Under high-pressure conditions, pressure-resistant support rings or reinforced pressure-resistant oil seals should be used. 4) Installation eccentricity: Excessive eccentricity between the oil seal and the shaft will degrade sealing performance, especially at high shaft speeds. If eccentricity is excessive, oil seals with a "W" cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; a higher shaft surface finish results in a longer oil seal service life. 6) Ensure a certain amount of lubricating oil is present at the lip of the oil seal. 7) Take special care to prevent dust from entering the oil seal.

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