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 score positive displacement pump, vane pump, special purpose pumps, etc. Among them, the vane pump centrifugal pump in the most widely used.

a centrifugal pump during operation to avoid two problems: stop the pump water hammer and lower than the minimum flow. Solve problems, the two methods is more, but the basic idea is how to a suitable system around the centrifugal 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.

stop pump water hammer protection and the valve

medium velocity in water hammer pressure pipeline is a series of sharp pressure caused by severe changes 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.

stop 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 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.

stop pump water hammer to prevent

countermeasures to avoid 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.

1, set up slow close check valve

slow close check valve is a kind of achieved by increasing the actuators, damper slow close check valve. Above to install a slow close check valve of the centrifugal pump stopped pumping 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.

2, set up slowly-closing check butterfly valves

this is a used more common in large water conservancy system, the effect is good method. Slowly-closing performed by the butterfly Industrial Valves, 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.

avoid minimum flow condition and valve

minimum flow refers to guarantee the normal work of the pump can flow. If the pump is lower than the minimum flow under the condition of work, 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 work in centrifugal pump minimum flow conditions, the common approach is to feed the centrifugal pump sets minimum flow loop. But from the pump itself value, only for the big flow, high lift, high power of centrifugal pump set minimum flow circuit is reasonable. Centrifugal pump to allow the minimum flow of value be determined by the pump manufacturer calculation or experiment.

the simplest minimum flow loop only need to install a switch valve in the circuit, such as gate valves, when think open when the pump is in working condition of minimum flow valve, turn on the minimum flow loop, avoid pump work at the minimum flow condition.

summary

more than introduce the basic structure of the valve and the common valve, but because according to the working condition of application of the corresponding improvement, makes these valves dedicated to solve the problem of the two types of valves.

Given the important role played by in ensuring proper functioning of y gate valve, every individual must take an interest towards improving resilient gate valve.
Helping the needy resilient valve industries with quality products had been our main goal and we have succeeded in providing simple and effective solutions which has a huge scope to be implemented in the near future. Go to Mech Valve to know more about us.
An interesting website that contains directions (and recommends items) for ductile iron gate valve os & y valve fire protection is Mech Valve. Find us on Mech Valve, your problem will be fixed.