Several major misunderstandings of mechanical seal installation and overhaul
Today I saw a post about various problems after installing a new seal. In fact, it is not the professional who will have more or less the following major misunderstandings during installation.
1) The larger the amount of Spring compression, the better the sealing effect. In fact, if the spring compression amount is too large, the friction pair may be sharply worn and burned instantaneously; excessive compression causes the spring to lose the ability to adjust the end face of the moving ring, resulting in seal failure.
2) The tighter the moving ring seal is, the better. In fact, the dynamic ring seal is too tight and harmful. First, the wear between the seal ring and the bushing is intensified, and the leakage is premature. Secondly, the resistance of the axial adjustment and movement of the moving ring is increased. When the working condition changes frequently, the adjustment cannot be timely; thirdly, the spring is excessively fatigued and easily damaged; It is to deform the moving ring seal and affect the sealing effect.
3) The tighter the seal ring of the static ring, the better. The static ring seal is basically at rest, and the relatively tight seal will be better, but too tight is also harmful. First, the static ring seal is caused by excessive deformation, which affects the sealing effect. Second, if the static ring material is graphite, it is generally brittle, and excessive force is easy to cause chipping. Third, it is difficult to install and disassemble, and it is easy to damage the static ring.
4) The tighter the impeller lock nut, the better. In mechanical seal leakage, leakage between the bushing and the shaft (interaxial leakage) is relatively common. It is generally believed that the leakage between the shafts is that the impeller locks are not locked. In fact, there are many factors causing leakage between the shafts, such as the failure of the inter-axis pads, the offset, the impurities between the shafts, and the larger shape of the shaft and the sleeve. The position error, the contact surface is broken, there is a gap between the components on the shaft, and the shaft thread is too long, which causes leakage between the shafts. Excessive locking of the lock nut will only lead to premature failure of the inter-axis pad. On the contrary, the lock nut is moderately locked, so that the inter-shaft pad always maintains a certain compression elasticity. During operation, the lock nut will automatically lock in time, so that the shaft is always in good condition. Sealed state.
5) The new one is better than the old one. Relatively speaking, the effect of using a new mechanical seal is better than that of the old one, but the quality or material selection of the new mechanical seal is not appropriate. The large dimensional error will affect the sealing effect; in the polymerizable and permeable medium, the static ring is not excessive. Wear or not replace it as well. Because the static ring is in a static state for a long time in the static ring seat, the polymer and impurities are deposited as one body, which has a good sealing effect. (Source: Othello Seal)
Hebei Pengyu Sealing Material Co., Ltd. products are as follows:
1: Packing series: carbon packing, PTFE packing, graphite packing, high water based packing, aramid packing, aramid PTFE mixed packing, aramid carbon mixed packing, polytetrafluoroethylene Ethylene split wire packing, PTFE packing, expanded PTFE packing, asbestos packing, carbon fiber packing, butter packing, oil-impregnated asbestos packing, asbestos rubber packing, glass fiber packing, ceramics Fiber packing, nylon packing, composite fiber packing, ceramic packing and other products.
2: Various gasket series: PTFE gasket, PTFE coated gasket, flexible graphite gasket, metal coated gasket, asbestos rubber gasket, graphite composite gasket, toothed gasket, asbestos gasket, Ladle gasket, metal spiral gasket, graphite gasket, graphite high-strength gasket, PTFE gasket gasket, rubber flange gasket, asbestos manhole gasket, asbestos hand hole gasket, autoclave special sealing ring, reaction kettle Special sealing ring, etc.
3: Rubber products: various special-shaped products such as silica gel, fluorine rubber, nitrile rubber, EPDM, and neoprene.
4: PTFE products series: PTFE rod, PTFE raw material belt, PTFE elastic belt, PTFE gasket, PTFE sheet, etc.
5: Graphite products: graphite packing, graphite rope, graphite gasket, graphite high-strength composite mat, flexible graphite packing ring and other special-shaped graphite pieces.
Hebei Innovation Sealing Material Co., Ltd.
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Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
Round head Tapping screw,hex tapping screw,flat head tapping screw,pan head tapping screw,truss head tapping screw
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