How to connect with pipe?

Valve is connected to the pipes to form a pipe system so that the fluid can be flowed for the first time.
Therefore, the connection between valve and the pipe is a critical part, and after connection, careful work is required to prevent leakage or breakage.
In addition, when classifying valve, it is sometimes classified by the construction of the connecting end.
This section describes the most basic “screw-in type”, “flange type”, and “welded type”.

Screwed end

This connention method uses pipe threads and is mainly used for connections of sizes 2 inches or smaller and pressures of 1 MPa or less. Because it is easy to install only by thread processing, it is economical because it does not require a large number of parts compared with other connection methods. On the other hand, it becomes difficult to redo it in repairs, etc. There are “female thread and male thread” and “taper thread and parallel thread” for the types of screws. valve is “taper female thread” for the majority.


Welding type

This method welds the valve directly to the pipe, and is used for high-temperature, high-pressure applications and pipelines where leakage is to be completely prevented. There are two types of welding
methods: socke weld and butt weld.

1)Socket weld type

Generally, the weld end of valve is socket-shaped (female), and the tube is inserted and welded here. The dimensions of valve apply to small sizes smaller than 2 in.

2)Butt weld type

Valve and tube are butted together and welded together. The butts are beveling to each other to make them suitable for welds. The dimensions of valve apply from small to large sizes.


Flange type

The connecting part is called a flange. The connecting part is called a “rib” and the “rib” and the “rib” are connected with a bolts and nut. It is the most widely used method, from low to high pressure, from small to large sizes.


Contact us

For inquiries about product technology, product purchases,
catalogs, and quality