Whether the iron gate valve is installed on top of the check valve

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.

What do you mean by installing on top of the check valve?

Also known as check valve, it is an automatic valve, which relies on the pressure of the flowing medium in the pipeline to push the valve disc to achieve the closing and opening of the valve, when the medium stops flowing, the check valve.

The valve disc is closed, and at the same time, it can prevent the backflow of the medium in the pipeline, which plays a great role in ensuring the safety of the pipeline.

The installation of the check valve is to ensure the flow direction of the water flow inside the pump, so as to ensure the normal operation of the pump, so the installation position of the check valve, whether it is installed in front of the pump or after the pump, can be divided into two situations:

One is to install the end of the vertical suction pipe in front of the pump, the purpose is to fill the pump with water once without pumping water, because the pump can only idle and pump water when there is no water in the pump and the straw in front of the pump, so the pump must be filled with water to pump out the water, the installation of this pump is a method when it is higher than the liquid level, also called the negative pressure method, such as pumping water up from the well.

Another method of installing a water pump is that the liquid level is higher than the water pump, which is generally a secondary water supply.

When using this method, because the liquid level is higher than the pump, in order to facilitate the start and stop of the pump, there is no need to close the pump outlet valve, so the check valve should be installed at the rear of the pump.

The check valve must be installed at the outlet of the pump, in front of the outlet control valve, in order to allow 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 partition valve (such as butterfly valve, gate valve, globe valve).

etc.). 1. Install the check valve first, and then install the gate valve or butterfly valve.

Advantages: It can protect the check valve, especially in parallel pumps, when one pump does not start and the other pump starts, the impact force.

It is all a gate valve or a butterfly valve.

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

2. Install the gate valve or butterfly valve first and then install 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 switched on and off by the pressure difference, if the pressure of the main pipe is high, the pressure of the pump is high, if the flow rate is unstable, then the check valve will be repeatedly switched and closed, which will affect the life of the check valve.

The check valve is installed in front of or behind the valve without affecting the function. Precautions for the installation of check valve 1, the check valve is a one-way valve, so the installation position, height, inlet and outlet direction must meet the design requirements, and the direction of the medium flow should be consistent with the direction of the arrow marked on the valve body. 2. Before installing the check valve, the appearance should be checked, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB 12220.

It can only be used after passing the standards. 3. Do not let the check valve bear the weight in the pipeline, especially the large check valve, which should have independent support and not be affected by the pressure generated by the pipeline.

1) The installation location, height, and direction of the inlet and outlet must meet the design requirements, and the connection should be firm and tight.

2) All kinds of manual valves installed on the insulation pipeline, the handle shall not be downward.

3) 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 housing and packing should be qualified without leakage.

In the tightness test, the test pressure is multiple of the nominal pressure;The test pressure should meet the requirements of GB 50243 standard for the duration of the test, and the sealing surface of the valve disc should be qualified if there is no leakage.

4) Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collisions are strictly prohibited.

5) The gate valve with transmission mechanism shall be installed according to the provisions of the product instruction manual.

In front of the meter, the function is to prevent the water in the pipeline from flowing backwards when the water is stopped, and affect the reading of the water meter, according to the specification, the check valve (check valve) should be installed behind the meter, if installed in front of the meter, it will cause the meter measurement to be inaccurate and damage the meter parts. However, the measurement accuracy cannot be guaranteed, and some will even affect the normal use accuracy of the water meter. The valve is opened when the inlet pressure is greater than the sum of the disc weight and its flow resistance.

Conversely, the valve is closed when the medium flows backwards. The swing check valve has a tilt and.

<> water meter check valve is installed in front of the water meter. Installed behind the gate valve and in front of the water meter. In order are gate valves, check valves, and water meters.

The water with a relatively low temperature enters our home and is heated by us at room temperature, which will increase in volume, which will produce a disturbance situation where the pressure of the tap water pipe network in our home is greater than the pressure of the main network, that is, it will reverse flow and naturally pass through the water meter.

Explain that the water meter has the possibility of rotation, there are many reasons for rotation, the pressure of the pump is unstable, the air entering the pipeline and so on will cause the water meter to rotate, but the general reason is caused by the unstable pressure in the pipeline, at this time the installation of a check valve will have a certain effect, but the installation of the check valve after the water meter can protect the water meter from the impact of the pressure gauge of the water pipe, if there is no check valve to encounter the water pipe leakage or which one continuously uses a large amount of water, your water meter will be reversed. The consequence is that it is not clear how much water check valve you are using.

Check valve, also known as one-way valve, is that the water flow can only flow in one direction, it is almost useless to measure water with this method, the valve should be closed to observe whether the water meter is rotated, whether there is private connection, and whether there is leakage under pressure. The swing check valve has a diagonal disc that rotates around the shaft and works similarly to a lift check valve. Check valves are often used as foot valves for pumping devices to stop the backflow of water.

The check valve is used in combination with the globe valve to play the role of safety isolation. The check valve should be installed behind the water meter to prevent backflow. However, there is no mandatory requirement for installation.