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A new method of mechanical seal preload control-
by：Lepu Seal
2021-03-21
New method of preload control of mechanical seal
2016-12-12
The force of the gasket of the mechanical seal mainly comes from the bolt pre-tightening force, but in actual operation, the static seal structure is a nonlinear statically indeterminate system composed of a pair of flanges, bolts, gaskets (and other parts) Therefore, for such a system, the bolt force cannot be completely transformed into the gasket stress during the assembly stage; it cannot be statically changed during the operation stage. This change in mechanical seal bolt force is governed by many factors, including pre-tightening tools and methods, temperature, pressure and cycle, bolt degeneration, gasket creep relaxation, etc. Among them, uniform and sufficient pre-tightening force of bolts is sufficient. An important factor to achieve long-term reliable sealing, but it is very difficult to achieve this in assembly.
There are many factors that affect the bolt pre-tightening force, such as tightening tools, operator and control accuracy, short-term slack and part blockage, etc., which makes the bolt force quite dispersed. Moreover, even when a torque wrench is used, the nut and the The friction coefficient between the thread and the supporting surface is different, and the bolt pre-tightening force has a large dispersion band (±50%). In addition, due to the elastic action between the bolts, even if the torque is uniformly applied, the force of each bolt will eventually differ greatly. Therefore, over the years, new tightening tools, procedures and control methods continue to appear, such as the silver corner control method; special bolts for tension control; ultrasonic control of bolt elongation; use of grate to control the bolt to yield; M inch tightens all the bolts and so on. Using these installations and methods, the dispersion of bolt pre-tightening force can be controlled within ±1% although it is small. 194.html,
A new breakthrough in the design method of mechanical seal A new field of mechanical seal performance research
2016-12-12
The force of the gasket of the mechanical seal mainly comes from the bolt pre-tightening force, but in actual operation, the static seal structure is a nonlinear statically indeterminate system composed of a pair of flanges, bolts, gaskets (and other parts) Therefore, for such a system, the bolt force cannot be completely transformed into the gasket stress during the assembly stage; it cannot be statically changed during the operation stage. This change in mechanical seal bolt force is governed by many factors, including pre-tightening tools and methods, temperature, pressure and cycle, bolt degeneration, gasket creep relaxation, etc. Among them, uniform and sufficient pre-tightening force of bolts is sufficient. An important factor to achieve long-term reliable sealing, but it is very difficult to achieve this in assembly.
There are many factors that affect the bolt pre-tightening force, such as tightening tools, operator and control accuracy, short-term slack and part blockage, etc., which makes the bolt force quite dispersed. Moreover, even when a torque wrench is used, the nut and the The friction coefficient between the thread and the supporting surface is different, and the bolt pre-tightening force has a large dispersion band (±50%). In addition, due to the elastic action between the bolts, even if the torque is uniformly applied, the force of each bolt will eventually differ greatly. Therefore, over the years, new tightening tools, procedures and control methods continue to appear, such as the silver corner control method; special bolts for tension control; ultrasonic control of bolt elongation; use of grate to control the bolt to yield; M inch tightens all the bolts and so on. Using these installations and methods, the dispersion of bolt pre-tightening force can be controlled within ±1% although it is small. 194.html,
A new breakthrough in the design method of mechanical seal A new field of mechanical seal performance research
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