What is the impact of the connection method on plastic valves

As a common industrial valve product, plastic valves are widely used in chemical, petroleum, pharmaceutical, food and other fields. As an important component, the connection method directly affects the sealing performance, service life and safety of the valve. When choosing the connection method, it is necessary to comprehensively consider the working environment, medium characteristics, pressure and temperature of the valve to ensure the normal operation of the valve.
Common connection methods include threaded connection, flange connection, welding connection, ferrule connection, etc. Each connection method has its unique characteristics and scope of application.
Threaded connection is a simple and convenient connection method suitable for small-diameter plastic valves. Threaded connection is usually divided into internal thread and external thread. Internal thread connection is suitable for connecting internal thread pipes, and external thread connection is suitable for connecting external thread pipes. Threaded connection has the characteristics of easy disassembly and good sealing, but it is prone to leakage under high pressure and high temperature.
Flange connection is a common connection method suitable for large-diameter plastic valves. Flange connection includes flat welding flange, butt welding flange, threaded flange and other types, which can be selected according to actual needs. Flange connection has the characteristics of firm connection, good sealing and strong pressure bearing capacity, but installation and maintenance are more complicated.
Welding connection is to connect the valve and the pipe together by hot melt or solvent bonding, which is suitable for occasions with high requirements for sealing performance. Welding connection has the characteristics of firm connection, good sealing and corrosion resistance, but it requires professional technology and equipment and cannot be disassembled.
Ferrule connection is a simple and easy-to-use connection method suitable for some special occasions. Ferrule connection connects the valve and the pipe together through a ferrule and a sealing ring. It is easy to install and disassemble, but the sealing performance is poor.