Is the check valve installed prior to or following the outlet ...

Today we will talk about the check valve installation position. So, how do you figure out where to put the check valve? What is the difference between installing the check valve before and after the pump, and when should the check valve be installed before the pump? Because check valves are frequently used in conjunction with other valves, where should the check valve be installed when used in conjunction with other valves? Let us talk about it.

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The check valve is a self-closing valve. It uses the pressure of the flowing medium in the pipeline to push the flap, allowing the valve to close and open. When the medium stops flowing, the flap of the check valve closes, effectively preventing medium backflow in the pipeline, which plays an important role in ensuring pipeline safety.

The check valve is classified into three types based on its structure: lift check valve, swing check valve, and butterfly check valve. Vertical and straight-through lift check valves are the two types. Swing check valves are classified as single flap, double flap, or multi flap. Butterfly check valves are classified as either double flap or single flap. The above check valves are classified into four connection types: threaded connection, flange connection, welding connection, and wafer connection.

The check valve is installed to ensure the flow direction of the water flow inside the pump, ensuring the pump's normal operation. As a result, the installation position of the check valve, whether it is installed in front of or after the water pump, can be divided into two categories:

A bottom valve is installed at the end of the vertical suction pipe in front of the water pump. The goal is to fill the water pump once without pumping water once, because when there is no water in the water pump or the suction pipe in front of the pump, the water pump can only idle and cannot pump water, so the water pump must be filled with water before it can pump water out. This water pump is installed using a method that is high above the liquid level, also known as the negative pressure method.

The second is located behind the water pump. When the liquid level is higher than the water pump, it is easier to start and stop the water pump without closing the water pump outlet valve, which is especially important for the main pipe water pump system to prevent backflow.

The check valve must be installed before the outlet control valve at the pump's outlet so that it can be repaired. In general, the pump's first outlet is a soft connection (shock absorber), followed by a check valve, and finally a block valve (such as butterfly valve, gate valve, globe valve, etc.)

1. First, install the check valve, followed by the gate valve or butterfly valve.

Advantages: It can protect the check valve, which is especially important in parallel pumps. When one pump is turned off, its outlet door closes, and the impact force is borne by the gate valve or butterfly valve when the other pump is turned on. When a check valve fails, the inlet and outlet valve isolation systems can be closed to allow for repair.

Disadvantages include: who will guard the gate valve or butterfly valve? In one instance, the butterfly valve's valve plate was broken.

2. First, install the gate valve or butterfly valve, followed by the check valve.

Advantages: It can protect the butterfly valve or gate valve, and the check valve absorbs the impact force.

The disadvantage is that no one will protect the check valve. The check valve is activated and deactivated by pressure difference. If the main pipe pressure is too high, it will be closed, and the pressure of the pump will be opened. If the flow rate is unstable, the check valve will repeatedly open and close. Affect the check valve's lifespan. Furthermore, the check valve is broken, particularly the main control system, which can only be repaired after the system has been turned off.

In general, the internal connection parts and sealing parts of the check valve are prone to damage due to the frequent opening and closing actions of the check valve. From this standpoint, check valves are used to facilitate repairs and prevent the entire system from being shut down due to check valve failure. The valve is installed prior to the outlet gate valve or butterfly valve. Is this what you're seeing?

Where is the check valve installed? What is the difference between installation before the pump and installation after the pump?

How to determine the installation position of check valve? What is the difference between a check valve installed before the pump and a check valve installed after the pump? Where is it suitable for installation before the pump? Check valves are usually used in conjunction with other valves. So when used in conjunction with other valves, where should the check valve be installed?

Check valve, also called check valve, is an automatic valve that relies on the pressure of the flowing medium in the pipeline to push the valve disc to close and open the valve. When the medium stops flowing, the check valve disc closes, which can effectively Preventing the backflow of media in the pipeline plays a great role in ensuring the safety of the pipeline. 

Check valves are divided according to structure and can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and straight-through. Swing check valves are divided into three types: single-disc type, double-disc type and multi-disc type. Butterfly check valves are divided into butterfly double-disc and butterfly single-disc. The connection forms of the above check valves can be divided into four types: threaded connection, flange connection, welding and wafer connection.

Check valve installation location 

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1. The starting point of the pipeline

Check valves are usually installed at the beginning of the pipeline to effectively prevent backflow of the medium. In a pipeline system, the medium usually flows from the starting point of the pipeline to the end point. Without a proper check valve installed at the starting point, media may backflow, causing process failure or damage to other equipment.

2. Outlet of pump or pressure source 

Another common location for check valve installation is at the outlet of a pump or pressure source. A pump or pressure source often generates high pressure, which can cause damage to the pump or pressure source without a check valve to prevent backflow. Therefore, it is necessary to install a check valve at the outlet of the pump or pressure source. 

3. Installation at high places

In piping systems, it is sometimes necessary to install check valves at high locations. This usually occurs in vertical pipes or in high sections of pipes. In this case, the function of the check valve is to prevent the medium from flowing back due to gravity.

4. High and low points of horizontal pipes

It is also necessary to install check valves at high and low points in horizontal pipelines. When there are high and low points in the pipeline, liquid backflow may occur due to the characteristics of the liquid. Installing check valves at high and low points in the pipeline can effectively prevent liquid backflow.

5. Branch pipes 

The check valve is installed to ensure the flow direction of the water inside the water pump, thereby ensuring the normal operation of the water pump. Therefore, regarding the installation position of the check valve, whether it is installed in front of the water pump or after the water pump, there are two situations:

One is installed at the end of the vertical suction pipe in front of the water pump, also called the bottom valve. The purpose is to fill the water pump without pumping water once. Because when there is no water in the water pump and the suction pipe in front of the pump, the water pump can only idle and cannot pump water, so the water pump must be filled with water before water can be pumped out. This kind of water pump is installed above the liquid level, also called the negative pressure method.

The other is installed behind the water pump. This installation method is convenient when the liquid level is higher than the water pump. It is convenient to start and stop the water pump without closing the water pump outlet valve. Especially for the main pipe water pump system, it prevents backflow.

The check valve must be installed at the outlet of the pump and before the outlet control valve to facilitate access to the check valve. Generally, the first outlet of the pump is a soft connection (shock absorber), followed by a check valve, and then a isolation valve (such as butterfly valve, gate valve, globe valve, etc.)

1. Install the check valve first and then the gate valve or butterfly valve.

Advantages: It can protect the check valve, especially in parallel pumps. When one pump does not start, its outlet door is closed, and when the other pump starts, the impact force is borne by the gate valve or butterfly valve. After the check valve fails, the inlet and outlet valve isolation system can be closed for repair. 

Disadvantages: Who will protect the gate valve or butterfly valve? There was a case where the valve plate of the butterfly valve was broken.

2. Install the gate valve or butterfly valve first and then the check valve.

Advantages: It can protect butterfly valves or gate valves, and the impact force is borne by the check valve.

Disadvantages: Who will protect the check valve? The check valve is opened and closed by pressure difference. If the main pipe pressure is high, it will close, and if the pump pressure is high, it will open. If the flow rate used is unstable, the check valve will open and close repeatedly, which will Affect the life of the check valve. Moreover, the check valve is broken, especially the main control system, and the system needs to be shut down before repair can be carried out.

Generally speaking, because the check valve opens and closes more frequently, the internal connecting parts and sealing parts are prone to damage. In order to facilitate repair and prevent the entire system from shutting down due to check valve failure, from this perspective, the check valve The valve will be installed before the outlet gate valve or butterfly valve. 

The importance of check valves

1. Prevent medium backflow 

The main function of the check valve is to prevent the backflow of media in the pipeline system. Backflow may cause process failures, affect the normal operation of the system, and even damage other equipment.

2. Protect pump or pressure source 

Backflow may cause damage to the pump or pressure source. Installing a check valve prevents backflow and protects the proper operation of the pump or pressure source.

3. Improve system efficiency

By properly installing check valves, you can increase the efficiency of your system. Check valves can ensure the correct flow direction of media in the pipeline system and avoid waste of media and energy consumption.

4. Reduce maintenance costs

Properly installed check valves can reduce system maintenance costs. Backflow may cause damage to other equipment, requiring repair or replacement. Installing a check valve can effectively reduce this risk and reduce maintenance costs.

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