Precautions for installation of welded check valves

1.Do not make the check valve bear 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 pipe system.

2.When installing, pay attention to the direction of the medium flow should be consistent with the direction of the arrow marked on the valve body.

3.Lifting vertical flap check valves should be installed on vertical pipes.

4.The lifting horizontal flap check valve should be installed on the horizontal pipe.

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 influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, 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.

<> check valve construction and installation points:

1) The installation position, height, and inlet and outlet directions must meet the design requirements, and the direction of the medium flow should be consistent with the direction of the arrow marked by the valve body, and the connection should be firm and tight.

2) The visual inspection must be carried out before the valve is installed, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB 12220. For valves with working pressure greater than MPA and shut-off on the main pipe, strength and tightness performance tests should be carried out before installation, and they should be used only after they are qualified. During the strength test, the test pressure is times of the nominal pressure, the duration is not less than 5min, and the valve shell and packing should be transported without leakage to be qualified.

During the tightness test, the test pressure is multiple of the nominal pressure; The duration of the test meets the requirements of GB 50243.

3) Do not make the check valve bear the weight in the pipeline, and the large check valve (AETV one-way valve): it should be supported independently, so that it is not affected by the pressure generated by the pipeline.

The check valve is mainly used to prevent the medium in the pipeline from backflowing. Foot valves and duckbill valves also belong to the check valve system. It is a valve that automatically stops the backflow of fluid.

The disc of the check valve opens under fluid pressure and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes under the action of factors such as fluid pressure difference and its own gravity to prevent the fluid from backflowing. So, what is the principle of a check valve?

Let's find out.

How the check valve works].

Check valve opening refers to the opening of the valve disc by the positive flow of the medium, the same reason that the medium backflow pushes the valve disc and closes, the check valve is also called a check valve, a check valve, a counterflow valve, and a back pressure valve. Most of them belong to automatic valves, and their main function is to prevent the backflow of the medium, prevent the reversal of the pump and the driving motor and the discharge of the container medium. It is also used as a safety shield in auxiliary systems where the pressure may rise above the system pressure.

Check valve classification].

Check valves can be divided into three types: lifting, swinging, and butterfly. The lifting type can be divided into two types: vertical and horizontal, and the lifting structure moves along the axis. The swing type can also be divided into three types: single shield judgment flap type, double valve type and multi-valve type, and the swing type structure is rotated according to the center of gravity.

The butterfly structure is a straight-through flow channel. The opening and closing of the check valve relies on the flow force of the medium to open and close itself. The check valve is an automatic valve product, and the check valve is only allowed to be used in the pipeline where the medium flows in one direction to prevent the phenomenon of medium backflow.

It has a wide range of applications, and can be used in large and small calibers, various media, and high-voltage systems of power stations.

Check valves can be divided into swing check valves, shenghong modified drop check valves, butterfly check valves, empty discharge check valves, diaphragm check valves, wear-free spherical check valves, pipeline check valves, slow closing check valves, float fluorine-lined plastic check valves, float-shaped fluorine-lined Y-shaped check valves, high-efficiency silent check valves, flow control buffer check valves, swing-open check valves with pneumatic devices, swing-start check valves with pneumatic shut-off devices, electric slow-closing butterfly check valves, double butterfly buffer check valves, Double-plate check valves for gases, thin clamp-on check valves, clamp-down silencer check valves, swing-off check valves with minimum flow nozzles, internal pressure self-sealing bonnet flow-through swing-off check valves.

Attention should be paid to the following matters in the installation of check valves

1. 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.

2. During installation, pay attention to the direction of the medium flow should be consistent with the direction of the arrow voted by the valve body.

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

4. The lifting horizontal flap check valve should be installed in the horizontal pipeline.

Hello dear! I have inquired about the relevant information for you: the correct installation method of the check valve is as follows: 1. Before installation, you need to understand whether the height of the installation and the inlet and outlet direction of the water flow meet the requirements of the specification, and then you need to connect the water inlet end and the outlet end of the water pipe together, and after the connection, you can let the water flow from the inlet end, so that the check valve can also be in a normal operating state.

2. The water inlet end will generally be set at the lower position, and the water outlet end will be set at the position on the mountain socks. At the same time, when the incoming water pressure exceeds a certain value, the valve of the check valve will automatically open, and the water will flow out from the return to the outlet end. However, if the water pressure is relatively low, then there will also be a backflow of water, and the valve of the check valve will also leak and automatically close, and there is no water flowing out of the water outlet.

The correct installation method for the check valve is as follows:

1. Before installing the check valve, you must carefully check the appearance, brand, etc. of the check valve to see whether it meets the relevant standards stipulated by our country, and the check valve should be tested for strength and tightness, and it can be installed and used only after it is qualified.

2. If you want to install the check valve correctly, the installation height of the check valve and the inlet and outlet direction of the water flow must meet the relevant installation specifications, and the flow direction of the internal medium should be the same as the arrow direction marked on the check valve, and the connection position must be tight and firm.

3. When installing the check valve, you should first observe the two ends of the check valve in detail, and then find out the water inlet port of the check valve, and then connect the water inlet port of the check valve and the water outlet port of the water pipe together, when the water flow flows from the water inlet port of the check valve, the check valve will start to run.

4. The water inlet port of the check valve is usually located in the lower position of the check valve, and the water outlet port of the check valve is generally located in the upper position of the check valve. When the water pressure flowing into the check valve exceeds a certain value, the valve of the check valve will be automatically opened, and the water will flow out of the outlet port of the check valve.

A check valve is a type of valve used to control the one-way flow of fluids, usually used to prevent the flow of fluids backwards or backwards, and to protect the safety of pipeline equipment. Here's how to install the check valve correctly:1

Determine the installation location: Check valves should be installed in a horizontal or vertical position in the pipe to effectively control the flow direction of the fluid. At the same time, it should be considered that the convenience of maintenance and overhaul should be considered, and it is recommended to install it on an easily accessible site.

2.Clean the pipeline: Before installing the check valve, the pipe should be cleaned and flushed to remove dirt and impurities in the pipe to ensure the normal operation of the check valve.

3.Connection: Connect the check valve to the pipe, using a suitable connection and sealing material to ensure that the connection is strong, tight and does not leak.

4.Adjustment: After the connection is completed, it should be adjusted and checked to ensure that the valve is opened and closed properly, and at the same time to prevent the valve from jamming and leaking.

5.Conduct a test: After the installation is complete, a test should be performed to test whether the flow and pressure of the pipe is normal, and to ensure that the check valve is functioning properly to prevent backflow.

Notes:1Before installing a check valve, the flow direction and flow rate of the pipeline should be known so that the specification and model of the valve can be selected correctly.

2.When installing check valves, relevant safety regulations and operating procedures should be followed to ensure safety and stability. 3.

When using check valves, they should be inspected and maintained frequently, and valve components should be cleaned and replaced in time to ensure normal operation.