How the pipe and the valve are connected together

How to connect the common valve and pipe connection methods include: flange connection, the clamp connection, butt welding, screw connection, ferrule connection, clamp connection, self-sealing connection and other forms of connection.
1, the flange connection Flange connection is a flange with two ends of the valve body, corresponding to the flange on the pipe, and is installed in the pipe by a bolt fixing flange. Flange connection is the most used form of connection in the valve. Flanges have convex (rf), plane (ff), convex and concave surface (mf) and other points.
2, the folder connected to the valve installed in the middle of two flanges, the valve body usually has a positioning hole to facilitate the installation of positioning, the valve and the two ends of the pipe directly with the clamp through the connection form.
3, the welding connection Butt welding connection: both ends of the valve body welded into the butt weld bevel welding requirements, corresponding to the pipe welding bevel, fixed on the pipe by welding. Socket welding connection: both ends of the valve socket by welding requirements processing, and pipe welding socket connection.
4, threaded connection Threaded connection is a simple method of connection, commonly used in small valves. Body according to the standard thread processing, there are two kinds of internal thread and external thread. Corresponds to the thread on the pipe.
5, the sleeve connection sleeve connection, developed in China in recent years, its connection and sealing principle is that when tightening the nut, the sleeve under pressure to bite the edge of the pipe wall, And is in close contact with the conical surface of the fitting body under pressure, thereby reliably preventing leakage. Such as instrumentation valves.
6, the clamp connection This is a fast connection method, it only requires two bolts, for low-pressure valve often disassembled. Such as the health valve.
7, within the tight connection from the various forms of connection, are the use of external force to offset the media pressure, to achieve sealed. The following describes the use of media pressure self-tight connection. Its sealing ring is installed at the inner cone, with the media facing the side of an angle, the media pressure transmitted to the inner cone, and passed to the ring, at a certain angle of the cone, resulting in two components, one with Valve body center line parallel to the outside, the other pressure to the valve body wall. Behind this force is self-tightening. The larger the media pressure, the greater the self-tightening force. So this form of connection, suitable for high-pressure valve.
8, the other valve connection shape