1, the greater the amount of spring compression seal the better. In actual fact, the spring compression is too large, can lead to rapid wear and tear friction, instantaneous burning; excessive compression of the spring lost the ability to adjust the dynamic ring end face, leading to seal failure.
Pharmaceutical intermediates are actually some chemical raw materials or products used in the synthesis process. Chemical products do not need that kind of production license. They can be produced in ordinary chemical plants. As long as they reach some grades, they can be synthesized appropriately.
Types of intermediates
Intermediates refer to semi-finished products, which are intermediate products in the production of certain products. For example, to produce a product, it can be produced from intermediates to save costs.
Intermediates are formed from cyclic compounds such as benzene, naphthalene, anthracene, etc. through sulfonation, alkali fusion, nitration, reduction, etc. For example, benzene is nitrated to nitrobenzene, and then reduced to aniline, which can be chemically processed into dyes, drugs, vulcanization accelerators, etc. Both nitrobenzene and aniline are intermediates.
There are also acyclic compounds such as methane, acetylene, propylene, butane, butene, etc. through dehydrogenation, polymerization, halogenation, hydrolysis and other reactions. For example, butane or butene is dehydrogenated to butadiene, which can be chemically processed into synthetic rubber, synthetic fibers, and the like.
Butadiene is an intermediate.
It originally refers to the intermediate products produced in the process of synthesizing chemical products such as spices, dyes, resins, drugs, plasticizers, rubber accelerators, etc. using coal tar or petroleum products as raw materials. It now generally refers to various intermediate products obtained in the process of organic synthesis.
5-Bromo-2 4-dichloropyrimidine,4-Bromo-2-fluorobenzoic acid,4-Bromo-2-fluorobenzaldehyde,6-(4-Aminophenyl)-4 5-dihydro-5-methyl-3(2H)-pyridazinone Fuxin Custchem Fine Chemical Co., Ltd. , https://www.custchemvip.com
2, moving ring seal chart as tight as possible. In fact, the ring is too tight moving ring harmless. One is to exacerbate the wear and tear between the seal ring and the sleeve, premature leakage; the other is to increase the axial resistance of the moving ring, the resistance to movement, can not be adjusted in time when the working conditions change frequently; thirdly, Is to move the ring ring deformation, affecting the sealing effect.
3, static ring seal as tight as possible. Static ring seal is basically static, the relatively tight seal will be better, but too tight is also harmful. First, the static ring seal caused by over-deformation, affecting the sealing effect; Second, static graphite material to the majority, generally more brittle, excessive stress can easily cause fragmentation; Third, the installation and removal difficulties, can easily damage the static ring.
4, the impeller locker tighter and better. Mechanical seal leakage, the sleeve and shaft leakage (shaft leakage) is more common. Generally believed that the leakage between the shaft impeller lock is not locked, in fact, leading to leakage between the shaft more factors, such as the shaft pad failure, offset, impurities within the shaft, shaft and sleeve with a larger shape Bit error, contact surface damage, there is a gap between the various components on the shaft, the shaft thread is too long and so will lead to shaft leakage. Lock over lock only lead to premature failure of the shaft pad, on the contrary, lock the lock body, so that the shaft pad always maintain a certain degree of compression flexibility, in operation, the lock will automatically lock in time, the shaft is always in good Sealed state.
5, the new better than the old. Relatively speaking, the use of new mechanical seal effect is better than the old, but the new mechanical seal quality or material selection is not appropriate, with the larger size error will affect the sealing effect; In polymeric and permeability medium, the static ring without excessive Wear, or not replaced as well. Because the static ring in the static ring seat for a long time in a quiescent state, the polymer and impurities deposited as one, played a better seal.
6, the demolition is better than not demolished. In the event of a mechanical seal leak eager to repair, in fact, sometimes the seal is not damaged, just adjust the condition or adjust the seal to eliminate leakage. This will not only avoid waste but also to verify their own ability to judge the failure to accumulate maintenance experience to improve the quality of maintenance.