The operational reliability of the chemical pump includes two meanings: one is the long period running without failure; the two is the smooth operation of various parameters. The reliability of the operation is very important to the chemical production. If a pump often fails, it will not only cause frequent shutdown, but also affect production and economic benefits, and sometimes it may cause accidents in chemical systems. The fluctuation of chemical pump speed will cause the fluctuation of discharge and pump outlet pressure, so that chemical production can not be carried out normally or the reaction in the system is affected, and the material can not be balanced, which will not only cause waste, but also cause the quality of products to decline, or the products will be scrapped.
No leakage or less leakage
Most chemical pump medium is flammable, explosive and poisonous liquid, once the leak will seriously pollute the environment, endanger the safety and health of the staff, but do not meet the factory and no leakage clean and civilized factory requirements, it must ensure that chemicals do not leak when the pump is running, the use of new technologies, new materials the pump seal, according to operating procedures, quality maintenance.
A liquid that can deliver a critical state.
A critical state of liquid is often vaporized when the temperature is raised or the pressure is reduced. Chemical pumps sometimes deliver critical state liquids. Once liquids are vaporized in pumps, it is easy to cause cavitation damage, which requires pumps to have high cavitation resistance. At the same time, the vaporization of the liquid may cause friction in the static part of the pump, which requires a larger gap. To avoid damage due to dry friction due to the vaporization of liquids, mechanical seals, packing seals and labyrinth seals must be removed.
The pump of the critical state liquid can be used as the material with good self lubrication, such as polytetrafluoroethylene and graphite. For the shaft seal structure, besides the packing seal, the double end mechanical seal or the labyrinth seal can be used. When a double face mechanical seal is applied, the external sealing fluid is filled in the cavity between the two ends. When the labyrinth seal is applied, a sealed gas with certain pressure can be introduced from the outside. When sealing liquid or sealed gas leak into the pump, the pump medium should be no harm, if the leakage into the atmosphere is also harmless. Such as the transportation of critical state of liquid helium, the double mechanical seal the cavity can be used for sealing liquid methanol; delivery easy to vaporization of liquid hydrocarbon, the labyrinth seal can be the introduction of nitrogen