What are the most common types of connections for imported valves?

The connection method of the imported valve and the domestic valve is the same, and there must be a way of connecting with the pipe. How to connect the valve and the pipe together is called the connection mode of the valve;

This article will mainly analyze the connection method of the lower valve in combination with the specific connection method of the famous imported brand German Lite LIT.

1, threaded connection

This connection is usually made by machining the inlet and outlet ends of the valve into a taper pipe thread that is screwed into the threaded joint or pipe of the taper pipe. A sealant can be used because of the large leakage channel that can occur with this connection. Seal the tape or packing to block these channels. If the material of the valve body is weldable, it can be sealed after screwing. If the material of the connecting part is allowed to weld, but the coefficient of expansion is very different, or the range of variation of the operating temperature is large, the threaded connecting part must be sealed.

Threaded valves are primarily valves with a nominal diameter of less than 50 mm. If the diameter of the passage is too large, the attachment and sealing of the joint is very difficult.

In order to facilitate the installation and removal of the threaded valve, the fitting is available in the appropriate color of the piping system. For valves with a nominal diameter of 50 mm or less, the socket section can be used as a pipe joint, and the thread of the pipe joint connects the two parts of the joint.

General threaded connections are commonly used for imported solenoid valves, imported pressure reducing valves, imported ball valves, such as the high pressure internal thread solenoid valve of Germany Lite LIT, imported gas pressure reducing valve, and imported internal thread ball valve.

2, flange connection

Flanged valves are easy to install and remove. However, it is heavier than the threaded connection, and the corresponding price is also higher. Therefore, it can be applied to various pipe connections of various diameters and pressures. However, when the temperature exceeds 350 °C, the snails, gaskets, and flanges are loosely creeped, which significantly reduces the load on the snails. Leakage may occur on flanged joints with high force.

Flange connections are the most common connection method for imported valves and can be used for almost all valves. Such as imported flange ball valve, imported flange butterfly valve, imported flange check valve, imported flange stop valve.

3, welding connection

This connection is suitable for a wide range of pressures and temperatures and is more reliable than flanged connections when used under harsh conditions. However, it is difficult to disassemble and reinstall the valve of the welded joint, so its use is limited to applications that are usually able to operate reliably for a long period of time, or where the conditions are harsh and the temperature is high. Such as thermal power stations, nuclear power projects. On the pipeline of the ethylene project.

Welded valves with a nominal diameter of less than 50 mm typically have welded sockets to receive the pipe at the flat end. Since the socket is welded to the gap between the socket and the pipe, it is possible to cause the gap to be corroded by some media, and the vibration of the colleague pipe may fatigue the joint. Therefore, the use of socket welding is subject to certain restrictions.

In the case where the nominal diameter is large, the use conditions are harsh, and the temperature is high, the valve body often adopts the groove butt welding connection, and at the same time, the weld seam has strict requirements.

For example, Germany Lite LIT's imported welding high pressure shut-off valve, welding high pressure check valve, imported welding high pressure ball valve.

Clip connection: especially the valve body is a butterfly valve, the butterfly valve is more connected to the clamp; for example, the inlet pair butterfly valve, there is also a check valve and a ball valve pair clamp, such as an inlet pair clamp check valve, an inlet pair clamp ball valve.

Card sleeve connection: such a connection, such as a gas pressure relief valve, or an inlet gas cylinder pressure relief valve, is required to require the tube of the inlet and outlet ferrule 8 as required.

The clamp is fast-connected; for example, the quick-fit clamp connection of the imported sanitary butterfly valve and the quick-fit clamp connection of the imported sanitary ball valve.

Special vacuum flange connection for vacuum, such as vacuum quick release flange connection for imported vacuum ball valves, vacuum KF flange connection