How do anticorrosive centrifugal pump installation, the valve installation?

Anticorrosive centrifugal pumps are often used in the chemical corrosive liquid transport, in the use of installation, the valve when necessary, the valve has a lot of kinds, different kinds of valves, using different performance, installation location is different also, anti-corrosion pump is the core of industrial fluid equipment, its effect is like the heart of the human body, for fluid power within the device of the system, and ensure the normal working of the technological process. Commonly used pumps, according to the categories of a centrifugal pump, magnetic pump, slurry pump, etc. Among them, the anticorrosion four fluorine has been widely applied in centrifugal pump and pump. In the process of the centrifugal pump running need to avoid two problems: stop the pump water hammer and under small flow rate. Solve problems, the two methods is more, but the basic idea is how to a suitable system around the centrifugal water pump configuration. Valves in these system plays a very important role, and with the two types of problem understanding deepens, gave birth to many special valves. A small, avoid traffic condition and valve flow refers to guarantee the normal work of the pump can flow. If the pump work in below small flow condition, will cause the noise and vibration of the pump performance will become unstable, even can cause abnormal cavitation of pump, reduce the service life of pump. So measures must be taken to avoid centrifugal pump working in small flow condition, the common approach is to feed the centrifugal pump set small flow loop. But from the pump itself value, only for the big flow, high lift, high power flow of centrifugal pump set small loop is reasonable. Centrifugal pump to allow small flow value be determined by the pump manufacturer calculation or experiment. Simple little flow loop only need to install a switch valve in the circuit, such as gate valves, when think the pump is in working condition of small flow open the valve, through to the small flow loop, to avoid the pump work under small flow rate condition. Second, stop the pump water hammer protection and the valve water hammer is the dramatic change of pressure pipeline medium velocity in sharp pressure caused by a series of alternating lift water hammer phenomenon. The harm of water hammer is very big, can destroy a pump, pipe and other equipment. Water hammer in the pressure pipeline there are many causes, such as fast closing of valve, pump abnormal shutdown, etc. 1, stop the pump water hammer mechanism when due to abnormal reasons, such as power, pump suddenly stopped working: the initial stage, piping within the medium depends on inertia to move on, but the speed is gradually reduced to zero; At this point, if the piping layout is fall of on any account, medium under the action of gravity will go back to the pump; When backflow medium reaches a certain speed, the pump outlet check valve will shut down quickly, so, arrive here a large number of medium speed suddenly become zero, cause a tremendous rise of pressure medium here & ndash; Stop the water pump water hammer. A large number of literature points out, stop the pump water hammer is the main water pump outlet check valve shut down suddenly. But studies have found that, although in some cases, the pump outlet check valve can be cancelled, but in most cases, to prevent the backflow medium into the centrifugal pump, the pump outlet of backflow prevention setting is required. 2, stop the pump water hammer countermeasures to avoid the measures to prevent water hammer pump is going to have a lot of, such as installation of water hammer eliminator, relief valve, pressure regulating tank, such as the only introduction two application more general valve related measures. 3, set up slowly-closing check butterfly valve which is a large water conservancy system used in common, the effect is good method. Slowly-closing performed by the butterfly valve, check valve butterfly valve structure and hydraulic control system. Above for installation have slowly-closing check butterfly centrifugal pump stopped pumping water hammer protection system diagram. Slowly-closing check butterfly valve can be installed the system only, can play the role of check valve and can have the effect of switching valve. When open centrifugal pump, according to the first slow, quick steps to open, ensure the pump low load open; When the pump stop working suddenly, its closed after the first fast slow steps, which can avoid the generation of water hammer, and can avoid the excessive medium backflow through the pump, causing the mechanical failure of the pump. 4, set up slow close check valve slow close check valve is a kind of achieved by increasing the actuators, damper slow close check valve. Equipped with hydraulic slowly-closing stop check valve of the centrifugal pump pump water hammer protection system diagram, the slow close check valve need to cooperate with gate valve ( Switch valve) Use. When medium under the action of gravity flow back, check slowly closing, effectively avoided due to the ordinary check valve closed suddenly produce water hammer. Its shortcomings as part because closing speed is slow, medium inevitably flow back into the centrifugal pump, pump so can lead to mechanical failure.
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