German as dichtungstechnik seals, as dichtungstechnik models, as dichtungstechnik prices

as dichtungstechnik seals refer to devices that prevent fluid leakage, formed by 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. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly 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 seat and key or fixing screws.

as dichtungstechnik 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. 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 have axial compensation capability.

as dichtungstechnik seal system composition

1) Seal chamber: In the past, seal chambers housing 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 chambers have been established abroad. In addition, companies such as Durametallic in the United States and the Fluid Engineering Study Group 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) Volatile organic compound (VOC) emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while invisible VOC emissions were neglected, leading to environmental pollution and posing 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 volatile emissions in 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) Auxiliary system integration: Mechanical seal auxiliary systems require integration of cooling, heating, flushing, and other systems. Pump circulation needs optimization, and 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 barriers were commonly used to block liquids or gases 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 sleeves with barrier gas, etc., can be used to block gases and liquids.

as dichtungstechnik seal installation precautions

1) During installation, great care must be taken to avoid installation deviations. Tightening of the gland should be performed after coupling alignment. Bolts should be tightened evenly to prevent tilting of the gland face. Check all points with a feeler gauge; the error must not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve. It must be uniform around the circumference. Check all points with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) Spring compression must be carried out according to regulations. Excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, press it against the spring; it should automatically spring back. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. Before installing the mechanical seal on the machine, carefully compare it with the general assembly drawing to confirm that all parts are ready. Pay attention to any abnormalities such as scratches or damage on the sealing faces of the friction pair and O-rings. Also check for scratches on the surfaces of the shaft or shaft sleeve, flanges, and other components that come into contact with packing and O-rings (O rings). If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts to the site than necessary. If there are leftover parts after installation, it indicates missing components during installation. If parts are insufficient, it means unnecessary parts were assembled, thus serving as a self-check during installation.

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