How to maintain and maintain the micro resistance slow closing check valve?

Maintenance and maintenance methods of micro-resistance slow-closing check valves:

1. The valve should be stored in a dry and ventilated room to prevent moisture, rain and rust.

2. The opening and closing parts should be in the closing device when storing and transporting, and the following work should be done at the same time

The disc should be fixed in the open position.

The inner mouth at both ends of the diameter is blocked with foam boards, and the port must be plugged with a stuffy cover to prevent dust and rust, and keep the channel clean and the end face smooth;

The cylinder part is properly packaged for protection, shockproof and anti-collision;

The valves should be placed smoothly, with the pneumatic drive facing upwards and not squeezing each other.

It should be checked regularly when left for a long time. Every three months, the dirt and rust on the two channels, the sealing surface, and the protective status of the weld are inspected, and after wiping the dirt and rust, the anti-rust oil is re-painted to protect it, and the problem is serious and handed over to the check valve manufacturer for processing.

Extension of knowledge points:

The micro-resistance slow-closing check valve, also known as the check valve, is used to prevent the backflow of the medium in the pipeline. The opening and closing parts rely on the flow and force of the medium to open or close by themselves, so as to prevent the medium from flowing backwards. Check valves belong to the automatic valve category, which are mainly used on pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents.

It is suitable for cleaning media, and should not be used for media containing solid particles and high viscosity.

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.

Fill the capsule of the isolation device with water first; Open half of the micro control valve first; The adjustment of the piston adjusting screw will make the adjuster pull rod pull out 1 3 of the whole length outward, and the piston can stretch out 2 3 and fix the adjusting screw nut; Close the blowdown valve and open the check valve.

2 small valves play the role of switches, if the small valve is closed, the valve does not have a slow closing effect. One controls in, one controls out.

Many slow-closing check valves will have 2 regulating valves similar to needle valves at the front and rear ends of the valve control cavity, such as at the water inlet end of the valve upper cavity, adjust it to make its flow rate less than the regulating valve at the drainage end to reduce the resistance when the pump starts the water flow to push open the valve plate, such as in the latter its role is to control the speed of valve closing, according to the working conditions of the valve, the slow-closing check valve should be adjusted to: 1. The pump does not reverse, 2. The current of the pump start to open the valve is as low as possible 3. The closing action of the pump valve is soft, and the noise and vibration are as small as possible.

What should I do if the slow-closing check valve can't stop the water?

The working principle of the micro-impedance slow-closing check valve.

The working principle of the micro-resistance slow-closing check valve is to rely on the flow rate and head of the medium at the nozzle of Yansun, and the valve disc will automatically open to let the medium pass. Pressurized water in the valve body flows through the microvalve into the rear chamber of the piston assembly, pushing the piston out of the piston chamber. When the water flow stops (or the pump suddenly stops running), the disc closes automatically due to the dead weight of the disc and the action of the water backflow.

However, because the piston is in the push-out position, it is pressed against the disc, so that the disc cannot close all the valve ports and the remaining 20% of the opening allows the water to pass through, so the water hammer pressure is weakened. When the valve disc is pressed on the end of the piston, due to the generation of reaction force, the water in the rear cavity of the piston prevents the piston from exiting, and also prevents the valve disc from closing.

The disc is divided into two steps, fast and slow, to prevent reversal and reduce water hammer. The length of the piston extension determines the degree of pure auspicious opening of the disc slow closing. The slow closing opening is large, the water hammer is small, and the closing time is extended; Conversely, the opening is small, which can produce destructive water hammer.

Therefore, this product adopts a slow closing opening adjuster in the structure, that is, the length of the piston extension is controlled by a tie rod. In order to meet the requirements of the slow closing time of various systems, the valve is equipped with a micro regulating valve, which can accurately control the flow of compressed water in the rear cavity of the piston according to the length of time when the peak water hammer arrives, that is, the slow closing time of the control valve disc.

Precautions for the installation of the micro-resistance slow-closing check valve.

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 on the horizontal pipeline.

Check valves include swing-type check valves and lifting check valves.

Check valves only allow the medium to flow in one direction and prevent it from flowing in the opposite direction. Usually the check 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 fluid pressure and the weight of the disc and the disc act on the valve seat, thus cutting off the flow.

The micro-impedance slow-close check valve has a medium hinge mechanism and a gate-like disc rests freely against the sloping ground seat surface. To make sure the disc is there every time.

The valve disc is arranged in the hinge mechanism so that the valve disc has enough space to swing and make the valve disc truly and fully in contact with the valve seat. The disc can be full.

It is made of metal, but it can also be inlaid with leather, rubber, or synthetic overlay, depending on the applicable performance requirements. Swing check valves are fully open.

In this case, the fluid pressure is virtually unimpeded, so the pressure drop through the valve will be minimal.