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Twin Panel Linear Lights, as the name suggests, is a combination of line lights that look like two panel lights, which can emit the soft light of the panel lights without losing the modern beauty of the line lights.
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The purpose and connection of the valve
Valve is a pipeline attachment, which is used to change the passage cross-section and the direction of flow of media to control the flow of a medium transport device. Specifically, the valve has the following purposes: (1) connect or cut off the medium in the pipeline. Such as valve, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve. (2) adjust, control the medium flow and pressure in the pipeline. Such as throttle, regulating valve, pressure reducing valve, safety valve and so on. (3) Change the direction of medium flow in the pipeline. Such as the distribution valve, three-way cock, three-way or four-way ball valve. (4) to prevent the media back in the pipeline. Such as a variety of different structures of the check valve, the end of the valve. (5) to separate the medium. Such as a variety of different structures of steam traps, air traps and so on. (6) instructions and adjust the liquid level. Such as liquid level indicator, liquid level regulator. (7) other special purposes. Such as temperature control valve, over-current protection emergency shut-off valve. Among the various general purpose valves described above, the valves used to connect and disconnect the medium flow in the pipeline are used in an amount of about 80% of the total number of valves. There are valves and fittings, they are used in the pipe connection or control system. Valves and fittings can not exist independently, complement each other. Valve fittings are carbon steel and stainless steel, and PVC, or other materials, commonly used is the first two kinds, in recent years as people's living standards improve, the demand for non-staple food also will be large demand Up Therefore, the rapid development of food machinery led the exhibition, so stainless steel sanitary valve pipe fittings industry booming, people usually say that the valve pipe fittings, or the use of stainless steel sanitary level. Valve connection: 1, flange connection This is the valve used in the most forms of connection. 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: high pressure, can be used in the hard washer 3) Mortise groove: 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 a plain washer. 2, the clamp connection bolts directly to the valve and the two pipes wear together the connection form. 3, butt welding connection 4, threaded connection This is a simple method of connection, commonly 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. 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. 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. 6, the clamp connection This is a fast connection method, it only needs two bolts, suitable for the often disassembled low-pressure 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. 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. Valve quality standards GB / T12220-1989 common valve mark GB / T12221-2005 metal valve structure length GB / T12222-2005 multi-turn valve drive connection GB / T12223-2005 part of the rotary valve drive connection GB / T12224-2005 General requirements for steel valves GB / T12225-2005 Common technical specifications for copper alloy castings GB / T12226-2005 General valve gray cast iron technical conditions GB / T12227-2005 General valve ductile iron technical conditions GB / T12228-2006 General valves Carbon steel Forgings technical conditions GB / T12229-2005 common valve carbon steel castings technical conditions GB / T12230-2005 common valve stainless steel castings technical conditions GB / T12234-2007 oil and gas industry with stud connection valve cover steel gate valve API 6D-2002 Valves for inspection and testing