Check valve, how to distinguish whether it is a threaded connection or a welded flange connection

All with flanges are bolted connections, all threaded whether internal and external, or union joints are threaded connections, and nothing is welded connection.

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.

Plastic check valves and plastic ball valves are flanged and threaded

The connection between the plastic pipe and the valve is as follows:

1) PVC-U hard PVC plastic pipe:

1) If the valve is an internal thread valve, an external thread transition joint should be used, one end of this transition joint has an external thread, and the other end is a socket that can be bonded with the plastic pipe.

2) If the valve is an external thread valve, an internal thread transition joint should be used, one end of which has an internal thread, and the other end is a socket that can be bonded with the plastic pipe.

3) If the valve is a flange valve, the PVC-U pipe and the valve should be connected by flange. The connection between the plastic pipe and the flange can be bonded, flared flange or flange with rings.

2) Connection between PP-R pipe and valve:

1) If the valve is an internal thread valve, a male thread adapter should be used, one end of this transition joint has an external thread, and the other end is a socket that can be hot-melt connected with PP-R plastic pipe.

2) If the valve is an external thread valve, an internal thread transition joint should be used, one end of this transition joint has an internal thread, and the other end is a socket that can be hot-melt connected with PP-R plastic pipe.

3) If the valve is a flange valve, the PP-R pipe should be connected with the valve by flange connection. The connection between the plastic pipe and the flange can be hot-melt connection, or flange with flange or ring.

4) The connection between PE pipe, PB pipe and valve is the same as that of PP-R pipe.

5) The connection between PVC-C pipe, ABS pipe and valve is the same as that of PVC-U pipe.

6) PE-X pipe, PAP pipe, these two types of pipes, the pipe size is smaller, the connection mode of the pipe is ferrule connection and compression connection, and the connection with the valve should adopt compression or compression transition joint.

Threads, flanges, and welds all refer to the way valves are connected. Each valve has a different connection type. If you don't know it, please check: Beijing Shougong Valve Manufacturing **** "Shougong Valve".

To show you**, internal thread, external thread, flange, welding, clamp, clamp, ferrule, all valves can be threaded, flanged, welded connection, threaded and welded below 50, most of the above 50 are flanged.

Threaded valves. It means that the connection between the valve and the pipe is threaded, and the valve is wired, which is used for the pipe with a smaller diameter.

Threaded flange valves.

It is said that the valve is a valve with a flange, and there is a wire on the flange, which is threaded with the pipe, and is used for inconvenient welding, such as galvanized steel pipes;

Welded flange valves.

It is said that the connection with the pipe is welded, and the diameter is larger.

Welded flange valve refers to the flange valve installed by welding the flange on the pipeline, and the threaded flange valve refers to the valve installed by installing the threaded flange on the pipeline, in fact, there is no difference for the valve, but the flange installation method on the pipeline is different.

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Welded flange valve refers to a valve that is installed by welding a flange on a pipeline.

Welding: also known as welding, bonding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure.

Welding achieves the purpose of bonding through the following three ways:

1. Heat the workpiece to be joined to partially melt it to form a molten pool, and the molten pool will be joined after cooling and solidifying, and the melt filler can be added to assist if necessary;

2. Separate heating of the solder with a low melting point, without melting the workpiece itself, connecting the workpiece by the capillary action of the solder (such as soldering and hard welding);

3. At a temperature equal to or lower than the melting point of the workpiece, supplemented by high pressure, superimposed extrusion or vibration, etc., the two workpieces can penetrate and bond with each other (such as forging welding and solid-state welding).

According to the specific welding process, welding can be subdivided into gas welding, resistance welding, arc welding, induction welding and laser welding and other special welding.

<> this one is a welded valve.

This is a flanged valve.

A flange valve is a flange on the valve body.

Welded flanges. Valve refers to the flange valve installed by welding the flange on the pipeline, and the threaded flange valve.

It refers to the installation of a thread on the pipeline.

Threaded flange. To install the valve, there is no difference between the valves, but the flange installation method on the pipe is different.