Germany KTR seals KTR models KTR prices

KTR 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. 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 seats and keys or set screws.

KTR 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.

KTR 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, Durametallic Corporation in the United States and the Fluid Engineering Study Group in the United Kingdom are both researching 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. This has resulted in environmental pollution and posed 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 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: Auxiliary systems for mechanical seals require integration, including 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. In gas-blocking seal systems, spiral groove gas seals with barrier gas, floating bushings with barrier gas, etc., can be employed to block gases and liquids.

KTR 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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