Water pump installation check valve will generate water hammer?

type has a lot of, have a self-priming pump, centrifugal pump, magnetic pump, pipeline pump, submerged pump, water pump, different kind of performance is also different, use water pump installation, need to install the check valve, general self-priming pump self-priming can do not need to check, centrifugal pump is used in the working condition of low level check valve, check valve installation will produce water hammer? A, what is the water hammer pump water flow within the pipeline due to open the valve, close the valve and pump stop suddenly changed, cause the sudden change of pipe flow rate, and per unit time the change of momentum, inevitably produce corresponding inertia force, causing rapid rise and sudden drop of the pipe inner pressure variations. The flow velocity and pressure change with time and location and phenomenon, called water hammer ( Or water hammer) 。 Pumping water hammer have to start the water hammer and close valve pump water hammer (water hammer and stop, Due to sudden power failure such as form) 。 The first two kinds of water hammer under the normal operating procedures, does not cause endanger the safety of the unit. The latter form of water hammer pressure value often large, thus caused the accident. Therefore, the study of water hammer and the purpose of calculating water hammer is: (1) to high water hammer pressure of pipeline damage and the protective measures; (2) to low water hammer pressure cause do not allow the negative pressure in the pipe, and lead to damage to pipeline protection; (3) prevent reverse damage produced by the phenomenon. In the pumping unit system, the characteristics of the pump is for pipe line boundary conditions at the end of the beginning, now we analyze the pump export don't install the check valve, pipe exports also no door, stop the pump when the accident, lose drive pump, water pump discharge side gate valve does not close in a timely manner, pipeline internal waters when backflow of water hammer process ( Or the hydraulic transition process) Lose their motivation, and the second, what is the water water pump working condition of the water pump, water pump speed fell sharply, pumps and water because of its inertia and flow within the pipeline along the original direction, but its velocity decrease rapidly, pressure drop, until the water stop forward flow, flow rate is zero. Are still forward at this moment, the water pump, water to flow ( From the pump to the direction of flow movement known as the outlet pond and a positive flow) , known as the water pump working condition. Third, what is the working condition of hydraulic turbine with the increase of reverse flow of water flow, the speed of the pump by zero and begin to reverse, and rapidly rising, at the same time, the rotation of the impeller of the centrifugal force of water followed, blocking effect to the reverse flow of water. This resistance increases with the acceleration of the impeller reverse, after making the pump pressure rising rapidly, at some point to achieve great value, its corresponding reverse rotation speed is at large. Increase in resistance at the same time, also increase resistance against the reverse flow of water flow, after reaching a big value, reduce gradually. Less effect on the impeller of energy, make the reverse speed decreases gradually, until the stable under the action of static head, the water flow in the impeller on the parts of the torque and turning resistance moment balance, the unit at a constant reverse flow rate and rotational speed under the condition of no load work like turbine, water hammer pressure disappear. This moment working condition of state called the working condition of the turbine. Four, what is the braking condition in the transient static water bodies of water flow rate is zero, because of the effect of static head, the outlet pond and a water pipe produced by reverse flow of water out of the pool to the water pump flow, reverse flow, is still in the forward to play the role of a brake pump impeller, unit force of rotor speed accelerated decline, until the engine speed is zero. At this moment, due to the impeller is turned to upstream resistance, pump outlet pressure increased. The moment of the pump transient condition called braking condition. Above for the water pump is not install the check valve. At the same time, after the pump pressure changes will be in the form of water hammer wave along the water pipes to the pool is shot, reflected by a pool of water, the water form a complicated water hammer in pipeline water hammer check valve products can choose waterproof hammer check valve.
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