What are the characteristics of the check valve?

Look at it, it's used. The function of flue check valve is fireproof, smoke-proof and odor-proof. The grooved check valve is designed to prevent the liquid from backing up and to prevent the pump and drive motor from reversing.

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.

Check valves, also known as check valves, single flow valves, check valves or check valves, are used to ensure that the medium in the pipeline flows in a directional direction without backflow.

Prevents gas or liquid from backing up in the pipeline.

Structural features. 1. The structural length is short, and its structural length is only 1 4 1 8 of the traditional flange check valve;

2. Small size, light weight, its weight is only 1 4 1 20 of the traditional flange check valve;

3. The parallel valve closes quickly, and the water hammer pressure is small;

4. Horizontal pipelines or vertical pipelines can be used, and the installation is required;

5. The flow path is smooth and the fluid resistance is small;

6. Sensitive action and good sealing performance;

7. The disc stroke is short, and the impact force of closing the valve is small;

8. The overall structure, simple and compact, beautiful appearance;

9. Long service life and strong reliability;

Check valve refers to the valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

Main role. The function of the check valve in the water supply system of the pump is to prevent the impact of the high-pressure water backflow on the impeller of the water pump. When the pump suddenly stops running for some reason during the operation of the system, the pressure in the pump disappears, and the high-pressure water connected to the outlet of the pump will flow back to the pump in the opposite direction.

When a check valve is installed at the outlet of the pump, it closes immediately, preventing the high-pressure water from flowing back to the pump.

The function of a check valve in a hot water system is to prevent hot water from flowing back into the pipes. If it is a PVC pipe, it is likely to burn the pipe and may even hurt people, especially in a solar water heater system.

Structural characteristics of the clamping check valve:

1. The length of the structure is short, the length of the structure is only 1 4 1 82 of the traditional flange check valve, the volume is small and the weight is light, and its weight is only 1 4 1 203 of the traditional flange check valve, the valve disc closes quickly, and the water hammer pressure is small.

4. Horizontal pipeline or vertical pipeline can be used, and it is easy to install.

5. The flow path is smooth and the fluid resistance is small;

6. Sensitive action and good sealing performance;

7. The disc stroke is short and the closing impact force is small.

8. The overall structure, simple and compact, beautiful appearance;

9. Long service life and reliable performance.

Check valves are widely used in our lives, in addition to the application in industrial production and mechanical equipment, we can also come into contact with them in our daily life, let's learn about the types and functions of check valves.

Types of check valves.

1. Swing-open check valve: suitable for large diameter occasions with low flow rate and infrequent flow changes, but it is not suitable for pulsating flow, mainly used to prevent the medium from stopping flow or backflow, and weakening the hydraulic impact. There are three forms: single-petal, double-petal and multi-half.

2. Lifting check valve: The lifting check valve can only be installed on the horizontal pipeline, which can be used with the globe valve to prevent the reverse flow of the medium.

3. Disc check valve: a check valve in which the disc rotates around the pin shaft in the valve seat. The disc check valve has a simple structure and can only be installed on the horizontal pipeline, and the sealing performance is poor.

Fourth, the pipeline check valve: the pipeline check valve is a new kind of valve, its small size, light weight, good processing technology, is one of the development directions of the check valve.

5. Compression check valve: This kind of valve is used as a boiler feed water and steam shut-off valve, which has the comprehensive function of lifting check valve and stop valve or angle valve.

The role of the check valve.

Check valve refers to the automatic opening and closing of the valve disc by relying on the flow of the medium itself, which is used to prevent the backflow of the medium, and the check valve is an automatic valve, whose main role is to prevent the backflow of the medium, prevent the pump and the driving motor from reversing, and the discharge of the container medium.

Check valves can also be used on lines that supply auxiliary systems where pressure may rise above the system pressure. The purpose of this type of valve is to allow the flow of the medium in only one direction and to prevent it from flowing in one direction. Usually this kind of valve works automatically, and the disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the self-closing disc of the valve sail is applied to the valve seat by the fluid pressure and the sail flap, thus cutting off the flow.

Among them, check valves belong to this type of valve, which includes swing check valves and lifting check valves. The swing check valve has a medium hinge mechanism and a door-like disc resting freely against the sloping seat surface. In order to ensure that the disc reaches the right position on the seat surface every time, the disc is designed with a hinge mechanism so that the disc has enough room to swing and that the disc is in true and full contact with the seat.

Depending on the performance requirements, the disc can be made entirely of metal, or it can be inlaid with leather, rubber stamping, or with a synthetic covering. When fully open, the fluid pressure is virtually unhindered, so the pressure drop through the valve is relatively small. The disc seat of the lift check valve is located on the sealing surface of the valve seat on the valve body.