What is the reason for the return sound after the pump is stopped?

It is possible that there are two scenarios.

First, check valve.

Due to the malfunction, the closure is not tight. For example, the valve core cushions something, or the valve core is damaged.

In this case, remove the bonnet and check the spool. The structure of the check valves is very simple.

Second, there is a delay period for water fall, which is normal if it is instantaneous.

Hope the above can help you.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

This is the phenomenon of water hammer. In a pressurized pipeline, the flow rate of the water suddenly changes due to some external reason (such as sudden closure of the valve, sudden shutdown of the pump unit), which causes water hammer, which is called water hammer or water hammer.

After the pump stops, the check valve makes a sound, how to eliminate the sound.

Hello, I am looking for relevant information for you, please wait for a while, it may be an air pressure problem or a blockage of the burner of the hungry writer, or it may be a broken water-gas linkage switch. When the valve is opened, the solenoid valve is reversed, the oil pump is started, and the hydraulic oil enters the cylinder through the flow control valve and high-pressure hose, which pushes the piston and drives the lever connected to it to lift the hammer to open the valve. After the valve is opened, the automatic pressure holding system is started; The motor continues to charge the pressure holding accumulator.

When the pressure reaches a high pressure set point, the oil pump stops. The rotary flow control valve handwheel can adjust the opening time of the valve with an adjustment range of 10 to 90 seconds. Additional Information:

When the valve is closed, the solenoid valve is reversed, and the pressure oil in the cylinder returns to the oil tank through the fast and slow joint flow valve, high-pressure hose and solenoid valve, and the hammer falls, and the connecting rod drives the butterfly plate to rotate the valve, quickly cutting off most of the water flow of about 70% of the previous stroke. The last 30% of the stroke is slowly closed. The fast, slow closing angle and buffer time of each stage can be adjusted according to the actual working conditions of the pipeline, which can effectively eliminate the water hammer of the pipeline; The adjustment time is 2 seconds 25 seconds for fast off, 6 seconds for 90 seconds for slow off.

Encyclopedia-Hydraulic Slow-Closing Check Butterfly Valve Is there air in the pipeline? Is it caused by water and air striking inside the pipes? Or is it the sound of the disc hitting the seat when the check valve is closed?

But the sound is not a knock knock.

Dear, hello, I'm glad to answer for you, what is the reason why the vertical check valve is installed and the water supply of the pump is stopped? The vertical check valve will make a sound when the water supply of the pump is stopped, which may be caused by the following reasons: First, there may be debris or foreign matter in the internal structure of the vertical check valve, which will cause the sound when the flame stop valve is closed.

At this time, the check valve needs to be disassembled for cleaning and maintenance; Second, the sealing gasket of a vertical check valve can be damaged or deteriorated, resulting in a valve that cannot be fully sealed when closed, resulting in a loud pitch sound. At this point, a new gasket needs to be replaced; Another possibility is that when the pump stops supplying water, there is a pressure fluctuation inside the pipe, causing the water to flow backwards, which causes the vertical check valve to rattle. At this time, it is necessary to overhaul and maintain the pipeline to ensure the normal operation of the pipeline.

When a vertical check valve is found to be ringing, it is necessary to troubleshoot the fault in time to avoid unnecessary damage to the pump and pipeline. I hope this service can help you, thank you for your consultation, and I wish you all the best!

1. Both ends of the valve passage must be blocked, and there is a dry and ventilated room. If it is stored for a long time, it should be checked frequently for corrosion.

2. The valve should be cleaned before installation, and the defects caused during transportation should be eliminated.

3. When installing, you must carefully check whether the logo and nameplate on the valve meet the requirements of use.

4. The lifting vertical flap check valve should be installed on the vertical pipeline.

5. The lifting horizontal flap check valve should be installed on the horizontal pipeline.

6. Do not make the check valve bear the weight in the pipeline, and the large check valve should be supported independently, so that it is not affected by the pressure generated by the pipeline.

7. When installing the check valve, special attention should be paid to the flow direction of the medium, and the normal flow direction of the medium should be consistent with the direction of the arrow indicated on the valve body, otherwise the normal flow of the medium will be cut off. The foot valve should be installed at the bottom end of the suction line of the pump.

8. The through-type lifting check valve should be installed on the horizontal pipeline, and the vertical lifting check valve and the bottom valve are generally installed on the vertical pipeline, and the medium flows from bottom to top.

9. When the check valve is closed, it will produce water hammer pressure in the pipeline, which will lead to damage to the valve, pipeline or equipment in serious cases, especially for large-mouth pipelines or high-pressure pipelines, so it should attract the attention of the check valve selector.

Summary. Hello dear.

We'll be happy to answer your questions.

This is the phenomenon of water hammer.

In a pressurized pipeline, a sudden change in the flow rate of water due to some external reason (such as sudden closure of a valve, sudden shutdown of a pump unit) causes water hammer, a hydraulic phenomenon called water hammer or water hammer. It is very harmful in the chemical industry.

The check valve vibrates loudly when the pump is turned on, what's going on.

Hello, pro-Motong. We'll be happy to answer your questions. This is the phenomenon of water hammer.

In a pressurized pipeline, due to some external reason (such as sudden closure of the valve, sudden shutdown of the pump unit), the flow rate of the water suddenly changes, thus causing water hammer, this hydraulic phenomenon is called water hammer or water hammer. The hazards in the chemical industry are very numerous.

If the valve suddenly closes and the pump unit stops suddenly, mine is just the opposite of this, and it is the pump that thinks.

1.There are many reasons for mechanical noise. It is often generated at the same time as the vibration of the pump.

The internal reasons of the pump itself are mainly due to the poor rigidity of the pump body, which constitutes a sound source when cavitation of the pump occurs; Poor impeller design rigidity can also lead to the above results. In addition, when the guide vane used in the horizontal multistage centrifugal pump is not rigid or the cross-sectional area at the inlet of the guide vane is not reasonably matched with the thickness of the inlet edge, it may cause the noise caused by the large vibration in the pump. The second section source, between the parts on the pump rotor and the non-rotating pump body, will also produce higher frequency noise due to contact friction.

Another cause of mechanical noise is due to problems with the external structure and installation of the pump. For example, the design of the base of the pump is unreasonable, the rigidity is small, and the filling concrete under the base has defects in carrying combustion, forming a "hollow drum phenomenon". Then there is the misalignment of the pump and the motor, which causes the vibration of the rotor and produces noise.

In short, the noise generated by the outside is easy to detect and easy to eliminate.

2.Aerodynamic NoiseAerodynamic noise is mainly caused by the rotation of the fan and rotor of the motor in the air, which is mainly related to the number of blades of the fan and the relative speed of air flow. In the case of water-cooled motors, this fan-induced noise can be eliminated.

3.Electromagnetic noise, known as lifting sound, is generated by the motor. Electromagnetic vibration caused by voltage instability; The eccentric air gap of the rotor is uneven, which increases the electromagnetic noise; The motor winding is faulty, causing the magnetic field to be unbalanced, making the motor produce a low roar; The rotor of the asynchronous motor has broken strips, the torque drop of the motor is low, the load current is high and low, and the noise is high and low when it occurs.

4.Hydraulic NoiseThe hydraulic noise of the pump is caused by hydraulic vibration, and the noise of the pump is the lowest when it runs in the highest efficiency area, which is the result of obtaining the best reasonable values of each hydraulic parameter in the hydraulic design of the hydraulic force. When deviating from the design conditions, the noise level is large and very destructive.

Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: why can't the check valve of the shallow water pump be opened for a long time:

Why can't the check valve of shallow water pump be opened for a long time 1 Flap type installation should be installed horizontally, while paying attention to the flow direction of the medium, and the arrow should be consistent with the flow direction. 2 Lifting type Pay attention to the flow direction of the medium during installation, and the arrow should be consistent with the flow direction. What you said is that the check valve can't be opened to see if the direction is reversed, if it is reversed, it is reinstalled.

Then it may be a mechanical failure or a long time to trap the dirt and block it, and it can be disassembled and repaired and debugged by itself. Of course, the check valve must have a certain pressure difference to work properly. There is also a pressure at the outlet that is greater than the pressure at the inlet.

Dear, I'm honored to have your question The information that the teacher found for you here is: why can't the check valve of the shallow water pump be opened for a long time: why can't the check valve of the shallow water pump be opened for a long time 1 Flap type When installing, it should be installed horizontally, and at the same time pay attention to the flow direction of the medium, and the arrow should be consistent with the flow direction.

2 Lifting type Pay attention to the flow direction of the medium during installation, and the arrow should be consistent with the flow direction. What you said is that the check valve can't be opened, see if the direction is reversed, and if it is reversed, it will be reinstalled. Then it may be a mechanical failure or a long time to trap the dirt and block it, and it can be disassembled and repaired and debugged by itself.

Of course, the check valve must have a certain pressure difference to work properly. There is also a pressure at the outlet that is greater than the pressure at the inlet.

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