A Threaded Connection
It is a simple connection method, which is often used for small valves. The inlet and outlet of the valve are usually machined into taper pipe threads or straight pipe threads. The joint may leak if the threaded connection is used, and sealant, sealing tape or filler can be used to fill it. Threaded valves are mainly valves with a nominal diameter below 50 mm. If the diameter is too large, it is very difficult to install the valve and seal the joint. In order to be convenient to install and disassemble threaded valves, pipe joints can be used at appropriate positions in the pipe system. The valve with the nominal diameter below 50mm can use the union piece as the pipe joint.
A Flange Connection
The flange connection is the most commonly used connection type between valves and piping or equipment. It is convenient to install and detach the flanged valve. But the flanged valve is heavier than the threaded one, and the price of the former is higher. Therefore, this connection method is suitable for connecting pipes of various sizes and pressures.
Welding
This connection is more reliable than flange connection when used under harsh conditions. However, it is difficult to disassemble and remount the welded valve, so this valve should be used under the condition that it can normally run reliably for a long time, or the service condition is harsh and the temperature is high. Therefore, the welded valve is suitable to be used for thermal power stations, nuclear engineering and ethylene projects. Valve and pipe welding connection is divided into butt welding (BW) and socket welding (SW). Butt weld connection (BW) can be applied to various sizes, pressures and high temperature conditions, and socket weld connection (SW) is generally applicable to <DN50 valve.
It is a simple connection method, which is often used for small valves. The inlet and outlet of the valve are usually machined into taper pipe threads or straight pipe threads. The joint may leak if the threaded connection is used, and sealant, sealing tape or filler can be used to fill it. Threaded valves are mainly valves with a nominal diameter below 50 mm. If the diameter is too large, it is very difficult to install the valve and seal the joint. In order to be convenient to install and disassemble threaded valves, pipe joints can be used at appropriate positions in the pipe system. The valve with the nominal diameter below 50mm can use the union piece as the pipe joint.
A Flange Connection
The flange connection is the most commonly used connection type between valves and piping or equipment. It is convenient to install and detach the flanged valve. But the flanged valve is heavier than the threaded one, and the price of the former is higher. Therefore, this connection method is suitable for connecting pipes of various sizes and pressures.
Welding
This connection is more reliable than flange connection when used under harsh conditions. However, it is difficult to disassemble and remount the welded valve, so this valve should be used under the condition that it can normally run reliably for a long time, or the service condition is harsh and the temperature is high. Therefore, the welded valve is suitable to be used for thermal power stations, nuclear engineering and ethylene projects. Valve and pipe welding connection is divided into butt welding (BW) and socket welding (SW). Butt weld connection (BW) can be applied to various sizes, pressures and high temperature conditions, and socket weld connection (SW) is generally applicable to <DN50 valve.
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