The connection mode of valve parts of instrument tube includes: flange connection, clamp connection, butt welding connection, thread connection, sleeve connection, clamp connection, self-sealing connection and other connection forms.
Flange connection type: flange connection is a flange at both ends of the valve body, corresponding to the flange on the pipe, installed in the pipe through bolts. Flange connection is the valve with more than zui connection form. Flange has convex surface (RF), plane (FF), convex concave surface (MF), etc.
Clamp connection type: the valve is installed in the middle of two flanges, the valve body usually has a positioning hole to facilitate the installation of positioning, with bolts directly the valve and both ends of the pipe through the clamp together.
Welding connection type is divided into butt welding connection and socket welding connection, butt welding connection: both ends of the valve body according to butt welding welding requirements processed into butt welding groove, corresponding to the pipe welding groove, fixed on the pipeline through welding; Socket welding connection: the two ends of the valve body are machined according to the requirements of socket welding, and the pipe is connected by socket welding.
Threaded connection type: threaded connection is a simple method of connection, often used in small valves. Valve body according to the thread standard processing, there are two kinds of internal thread and external thread. Corresponds to the thread on the pipe.
Type of sleeve connection: sleeve connection, developed in China in recent years, its connection and sealing principle is, when the nut, the pressure of the sleeve, the blade bit into the pipe wall, the outside of the cone surface of the sleeve and the pressure and the inside of the cone surface of the joint close, so as to reliably prevent leakage. Such as instrument valves.
Clamp connection: this is a quick connection method that requires only two bolts and is suitable for frequently disassembled low pressure valves. Such as sanitary valves.
Internal self - compact connection type: above all kinds of connection form, is the use of external force to offset the pressure of the medium, to achieve sealing. The following is a self - compact connection using medium pressure. Its seal ring is installed in the inside of the cone, with the medium to the side into a certain Angle, medium pressure to the inside of the cone, and transferred to the seal ring, in a certain Angle of the cone, produce two components, one and the valve body center line parallel to the outside, the other pressure to the inner wall of the valve body. The latter component is the self - tightening force. The greater the medium pressure, the greater the self - tightening force. So this type of connection is suitable for high pressure valves. It is more than flange connection, to save a lot of materials and labor, but also need a certain amount of pre - tightening force, so that in the valve pressure is not high, reliable use.
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