Valve end connection description

When selecting the valve connection method, we must pay attention to the structure of the valve connection port to ensure the smooth installation of the valve. Valve connection methods are usually divided into four types: flange type, welded type, thread type, clamp and ferrule type.

1: flange connection structure

For pipes with a diameter greater than 50, flange connections are usually used, which makes installation, maintenance and disassembly easier, and the applicable nominal pressure and nominal size are very wide. The valve flange connection can also be divided into butt welding flange, flat welding flange, socket flange, integral flange, and can be divided into convex flange, concave flange, full plane method according to the form of sealing surface. Lan. How to choose the flange structure and sealing surface depends on the working conditions at that time.

The common connection method of the flange is the integral flange. This flange is cast together with the valve and is also preferred by the customer. In some conditions with moderate conditions, it is suitable to use flat welding flanges, because the strength of the flat welded structure is relatively low, which also reduces the cost of the flange, and the installation is also convenient. The threaded flange is used below the diameter of 150, and other places. The flat welding flange is similar, but the disadvantage is that the sealing performance is not good, so it is not suitable for the threaded flange under some zero leakage conditions, and the socket welding flange is easy to install and weld, which is suitable for the small size method. Blue connection, but not suitable for toxic media, because welds are difficult to detect by radiography, and are not suitable for use in pipes with corrosive media. For high-strength, harsh conditions, such as oil and gas, applicable to welded flanges. The chemical medium has the advantage of being able to be soldered to the viewer and easily detected by radiation, making it extremely versatile.

2: welded joint structure

Welding is more reliable and durable than flanged connections and is suitable for all pressures and conditions. However, it is difficult to connect and disassemble the pipe, so it is limited to being able to operate reliably during the production period or under high temperature conditions. Such as generator stations, nuclear power plants and other pipelines.

For pipe diameters less than 50, thin wall thicknesses typically have welded sockets to receive the pipe with the flat end. However, due to the welds produced by the welding of valves and pipes, it is possible that the welds are corroded by some media, so the use of socket welds is also limited.

3: Threaded connection structure

Threaded connections are those that are often used to disassemble maintenance pipes, and are pipes with a diameter of less than 50 that do not harm the fluid, but threaded connections with a diameter greater than 50 can be used for non-hazardous fluids.

The threaded connection is divided into an internal thread and an external thread, and the structure can also be divided into a straight tube thread and a spinal tube thread. The internal thread connection is basically used to machine the spinal canal thread at the end of the valve body, and the connecting pipe is processed into a straight male thread. The external thread is used to machine the valve body end into a male thread, which makes it easier to install and disassemble. However, this connection is more prone to leakage, so a sealant or the like is used to block the channel.

4: clamp and ferrule connection structure

The same point of connection between the clamp and the ferrule is easy to install and disassemble, the connection is fastened, the impact resistance is good, the seismic performance is good, and the maintenance is convenient. The difference is that the clamp connection structure has strong flexibility, can resist earthquake, shrinkage and expansion on the pipeline, and has higher stability than the flange and the welded joint, which can protect the pipeline assembly and reduce the pipeline stress The structural parts are destroyed, the operation is simple, and the maintenance is convenient. It is more suitable for extreme operating conditions such as sanitary conditions and quick disassembly. The ferrule connection relies on the cutting edge of the ferrule, and the wall of the steel pipe is tightly clamped, so that the high pressure fluid in the pipe is completely sealed. It is more suitable for advanced connection methods in pipelines such as power stations, oil plants and chemical equipment.

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