Valve commonly used form of connection

Flange connection This is the most used form of connection in a valve. According to the shape of the junction can be divided into the following categories: 1) smooth: for the valve is not high pressure. Processing more convenient; 2) Bump: work pressure is higher, can be used in the hard washers; 3) Mortise slot: available plastic deformation larger washers, used in a more extensive corrosive media, the sealing effect is better. 4) trapezoidal groove: with oval ring for gaskets, used for working pressure ≥ 64 kg / cm2 valve, or high temperature valve. 5) Lens type: Gasket is a lens shape, made of metal. For working pressure ≥ 100 kg / cm high pressure valve, or high temperature valve. 6) O-ring: This is a newer form of flange connection, which is developed with the advent of various rubber o-rings. It is more reliable in sealing effect than conventional flat washers. Clamp connection Bolt directly to the valve and the two pipe wear together the connection form. Threaded connection This is a simple way to connect, often used in small valves. There are two cases: direct sealing: the internal and external threads directly from the sealing effect. In order to ensure that the joints do not leak, often with lead oil, linen and PTFE raw material filled with tape; Teflon tape, widely used on a daily basis; this material is very good corrosion resistance, sealing effect pole Good, easy to use and store, when removed, it can be completely removed because it is a layer of non-sticky film, superior than lead oil, linen is much better. Indirect seal: Thread tightening force, passed to the gasket between the two planes, so that the gasket sealing effect. Card sleeve connection card sleeve connection, developed in our country in recent years, its connection and sealing principle is that when tightening the nut, the card sleeve under pressure to make its edge bite into the outer wall of the tube, the card outer cone in the pressure So as to be in close contact with the conical surface of the joint body, leakage can be reliably prevented. The advantages of this form of connection are: 1) small size, light weight, simple structure, easy disassembly; 2) strong connection, wide range of use, high pressure resistant (1000kg / cm2), high temperature Shock and vibration 3) can choose a variety of materials, suitable for anti-corrosion; 4) machining accuracy is not high; easy to install at high altitude. At present, the form of sleeve connection has been adopted in some small-caliber valve products in China. Clamp connection This is a quick connect method that requires only two bolts for low pressure valves that are often disassembled. Self-tight connection within the above connection forms, 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. It is connected to the flange, to save a lot of material and manpower, but also need some pre-tightening force, so that when the valve pressure is not high, the use of reliable. The use of self-tight sealing principle of the valve, usually high-pressure valve. There are many forms of valve connection, for example, some do not have to remove the small valve, with the pipe welding together; some non-metallic valves, the socket connection, and so on. Valve users should be based on the situation with the specific treatment.

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