Installation occasions and principles of vertical check valves

Vertical check valves may be unfamiliar to everyone, although vertical check valves are being renovated.

It is often used, however, except for professional decoration friends, few owners have an understanding of its function. Vertical check valves are widely used in chemical, liquefied petroleum gas, fluids and other industries, and their uses are also very large, and they are not inconsequential. In fact, the vertical check valve is mainly used for pipelines, and its main function is to play a control switch.

The role can be controlled. Next, we will introduce the installation occasions and principles of vertical check valves.

Installation occasions of vertical check valves:

1. The installation position, height, and inlet and outlet directions must meet the design requirements, and it should be noted that 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. a valve. Visual inspection must be carried out before installation, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB12220.

3. For valves whose working pressure is greater than or play a shut-off role on the main pipe, the strength and strict performance test should be carried out before installation, and it should be used only after it is qualified.

4. 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 qualified without leakage.

5. During the tightness test, the test pressure is multiple of the nominal pressure; The duration of the test meets the requirements of GB50243.

6. Installation and use of vertical check valves: both ends of the valve path must be blocked, and there is a dry and ventilated room. If it is stored for a long time, it should be checked frequently for corrosion.

The valve should be cleaned before installation, and the defects caused during transportation should be eliminated. When installing, it is necessary to carefully check whether the signs and nameplates on the valve meet the requirements of use. This valve is installed on a vertical pipe.

The principle of a vertical check valve

1. When the medium flows in the specified direction, the valve disc is opened by the action of the medium force; When the medium is reversed, the valve disc and the sealing surface of the valve seat are closed due to the action of the self-weight of the valve disc and the reverse force of the medium, so as to prevent the medium from flowing backwards.

2. The sealing surface of the valve body and disc is welded with stainless steel.

3. The structural length of this valve is flanged according to the provisions of GB12221-1989.

The connection size is according to the provisions of JB T79-1994.

4. Vertical check valve: due to the pressure of the medium at the inlet end of the pipeline, the spring is overcome.

Resistance causes the valve to open or close. When the medium pressure at the inlet end is lower than at the outlet end, the spring will spool the spool.

Push the valve seat to close the valve and prevent the medium from flowing back, so it plays a non-return role. Vertical check valves are widely used in chemical, liquefied petroleum gas, fluid and other industries. According to the structure, the check valve can be divided into three types: lifting check valve, swing check valve and butterfly check valve.

The above is a specific introduction to the installation occasion and principle of vertical check valve. We know that after the installation of the vertical check valve, you can install it yourself, but if you can't operate it correctly, in fact, there is still a lot of danger, in view of this reason, or understand the principle of the vertical check valve can better control the effect of installation, to avoid ignoring some details of the problem, after the installation of the use of the vertical check valve has some trouble is not good.

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 valve refers to a kind of valve that has a circular disc and relies on its own weight and medium pressure to block the backflow of the mediumYesSwing-open check valve, lifting check valve, disc check valve, pipeline check valve, compression check valve.

Here's how to install it:

1. Swing-open check valve: The disc of the swing-open check valve is disc-shaped, and the rotating motion is made around the rotating shaft of the valve seat channel, because the channel in the valve is streamlined, the flow resistance is smaller than that of the lifting check valve, which is suitable for large-diameter occasions with low flow rate and infrequent changes in flow, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type.

The swing check valve is divided into three types: single valve type, double valve type and multi-valve type, which are mainly divided according to the diameter of the valve, in order to prevent the medium from flowing or reversing and weakening the hydraulic impact.

2. Lifting check valve: the check valve with the disc sliding along the vertical center line of the valve body, the lifting check valve can only be installed on the horizontal pipeline, and the disc can be used as a round ball on the high-pressure small-diameter check valve. Body shape and shut-off valve of lifting check valve.

(can be used with globe valves), so it has a large coefficient of fluid resistance.

Its structure is similar to that of globe valves, and the body and disc are the same as globe valves. The upper part of the valve disc and the lower part of the valve cover are processed with the guide sleeve Jane, the valve disc guide Jane can be freely lifted in the valve lamp guide Jane, when the medium flows downstream, the valve disc is opened by the thrust of the medium, and when the medium stops flowing, the valve disc falls on the valve seat by self-sagging, and plays the role of preventing the medium from counterflowing.

The direction of the medium inlet and outlet channel of the straight-through lift check valve is perpendicular to the direction of the valve seat channel; The vertical lifting check valve has the same direction as the direction of the medium inlet and outlet channel and the valve seat channel, and its flow resistance is smaller than that of the straight type.

3. Disc check valve: the disc surrounds the pin shaft in the valve seat.

Rotating check valve. The disc check valve has a simple structure and can only be installed on a horizontal pipeline, which has poor sealing.

4. Pipeline check valve: a valve in which the disc slides along the centerline of the valve body. Pipeline check valve is a new kind of valve, which is one of the development directions of check valve, which is small in size, light in weight and good in processing technology. However, the coefficient of fluid resistance is slightly larger than that of swing check valves.

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

Comprehensive functions.

Structure classification: According to the structure, it can be divided into three types: lifting check valve, swing check valve and butterfly check valve

1. The lifting check valve is divided into two types: vertical and horizontal.

2. Swing-open check valves are divided into three types: single-petal type, double-valve type and multi-valve type.

3. The butterfly check valve is a straight-through type.

The above check valves can be divided into threaded connections in the connection form.

There are four types of flange connection, welded connection and clamp connection.

The above content refers to Encyclopedia - Check Valve.

1. First of all, observe the two ends of the check valve, and find the water flow of the check valve into the port, which is generally in the lower part of the check valve. Connect this inlet port to the location of the water outlet from the water pipe. In general, water flows into the check valve from the inlet port first, and the check valve starts working again.

2. The other end is a little above the water flow port, which is the location of the water flow out. If the pressure of the water flow into the check valve reaches a certain value, the valve of the check valve will be opened, and there will be water flowing out of the outlet end, otherwise it will flow backwards, and the valve of the check valve will be closed, and there will be no water flowing out of the valve, so as to check whether the check valve is successfully installed.

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.

Abstract:Lifting check valve is a commonly used check valve, it can be divided into vertical check valve and horizontal check valve, the principle and function of these two check valves are almost the same, the main difference is in the installation, vertical check valve is vertically placed on the vertical pipeline, and the horizontal check valve is horizontally placed on the horizontal pipeline, which is better mainly depends on the specific application use. Whether it is vertical or horizontal, it is usually designed with pipes, and the two are not universal and cannot be installed interchangeably.

Let's take a look at the difference between vertical check valve and horizontal check valve. 1. What is the difference between vertical bend return valve and horizontal check valve?

Check valve is a kind of valve products that rely on their own weight and medium pressure to produce action to block the backflow of medium, lifting check valve is a more common structural form, it can be divided into vertical and horizontal two, so what is the difference between vertical and horizontal check valve?

Vertical check valve and horizontal check valve are both lifting check valves, there is basically no difference between the two in terms of structural principle and function, the main difference is that the vertical check valve is installed on the vertical pipeline, while the horizontal check valve is installed on the horizontal pipeline; When installed, vertical check valves are generally placed vertically, while horizontal check valves are placed horizontally.

In addition, there is basically no difference between the two to bury hunger, so which is better, vertical check valve or horizontal check valve?

Second, the check valve vertical type or horizontal type is better.

There are two kinds of check valves, vertical and horizontal, which is better mainly depends on the specific application, under normal circumstances, the effect of the two check valves is almost the same, but it is better to use vertical check valves when used in liquid flow system pipelines.

The above is in the case of the same specification material, when the actual choice, you can put the key performance technical indicators of each phase of the product given by the check valve manufacturer together for comparison to determine which check valve is better.

3. Can the vertical and horizontal type of check valve be used?

The functions and principles of vertical check valves and horizontal check valves are the same, but the installation methods and suitable pipelines are different, so are the horizontal and vertical check valves interchangeable?

In general, whether it is a vertical check valve or a horizontal check valve, it is designed together with the pipeline, and the two valves are not universal, so one of them should be selected according to the installation location and the situation of the pipeline.