Keywords: ship pipeline; valve technology; valve selection; development and research CLC number: U664 Document code: A
In recent years, with the continuous improvement of China's overall national strength, the development of China's maritime undertaking has also made rapid progress. Under such circumstances, the shipping industry has drawn much attention. Our country also invested a lot in the shipbuilding and other links, and the harvest is also significant. However, as a small part of the entire shipbuilding industry, pipeline valve technology is easy to be forgotten by most people. But its important role is that I think Nobody can be ignored. In the entire piping system, the valve not only has a series of effects and cut off the effect, it can effectively control the media flow rate, flow, pressure and even the stability of the key issues such as the key issues. In the current general ship piping, we usually see the basic types of valves are: safety valve , booster valve, pressure reducing valve , globe valve , check valve , check valve and gate valve . In this paper, we will select a few common types of marine piping valves for analysis and discussion.
First, the common types of valve analysis 1. Check Valve Usually we say the check valve is the check valve, its main role is to allow the media inside the pipeline can only be through in one direction, if you want to counter-current that is impossible. We take the lift check valve for example, a few of its points of use. First of all, the lift check valve can only be installed on top of the horizontal pipe, which is horizontal pipe, it is basically not be used in the vertical pipe installation above. Second, when connecting the lift check valve to the correct choice of gaskets and connections, and with reference to their work pressure and operating temperature of the appropriate choice of type to install. Finally, the installation process must be clear the flow direction of the medium to ensure that the arrow on the check valve and the flow of media in the same direction, if you encounter unclear signs of the phenomenon must be in accordance with the principle of low progressively higher to install.
2. Globe valve Globe valve is one of the most common valves we can often see in everyday life. It is mainly used to connect the medium in the pipeline or cut off the medium in the pipeline. It is generally divided into two types, right angle stop valve and through-stop valve. Globe valve although we are the most common type, but in its use and installation process there are still some places that we need to pay attention to, for example, we also need to consider his work pressure, temperature and other conditions to choose the right The type and connection form. Above the shut-off valve, the direction of the flow of the medium and the arrow also need to be consistent. Here is a general reference, that is, all the stop valves its handwheel are off in the clockwise direction, counterclockwise are open, this applies to any location.
3. Gate valve gate valve according to their work when the location of the stem is divided into two different stem-type and stem fixed, it is the most widely used as a cut-off valve, gate valve is also known as the gate valve. Although it can also be called a globe valve, the advantage of a gate valve compared to a globe valve is that the flow area of the gate valve is large and the flow resistance is relatively small. Moreover, the gate valve is not restricted to the inlet and the outlet, and the medium can flow from either side Through, due to the structure of the gate valve length is shorter, so the switch is more effortless. Of course, the valve also has some shortcomings, such as easy friction between the spool and seat damage, sealing ability easily destroyed, it should not be under greater pressure.
4. The valve box is generally divided into suction valve box, outlet valve box and transfer valve box according to the purpose. The valve box is for centralized control, a combination of two or more valves as a header, some of the valve box is cast with cast iron and some are also formed by the combination of valve. The suction valve box is characterized by the lower part of inhalation by the public part of the public discharge, and the discharge valve box is characterized by the lower part of the public inhalation and then discharged by the upper part.
5. Butterfly valve
Butterfly valve disc around the stem rotation, it is generally by the butterfly valve disc and erected stem to control the valve switch. Butterfly valve has a relative advantage is that it is easier to do automatic control, because the butterfly valve switch is generally directly controlled by the rotating stem. Automatic control of the butterfly valve is generally divided into two kinds of electric and pneumatic, the upper end of the butterfly valve will generally be installed on the angle indicator, so you can easily understand the valve open and close state.
Second, the development of the marine pipeline valve 1. Industry status In our country despite the social and economic development as a whole has been more favorable large-scale leap forward, but its more important supporting technologies, such as valve technology is still relatively lagging behind of. The relatively large variety of valves used in marine piping creates difficulties in the preparation and revision of standards for valves. Another aspect is that the use of the valve in the current ship's pipeline in our country is mainly based on manual valves such as stop valves and gate valves. Such traditional valves are still relatively insufficient in terms of weight, volume and sealing.
2. Development Measures As many of the valves used in China's ship pipeline are still relatively traditional, and this part has a relatively large proportion of existence, so while we conduct research and development of new products but also on the old standard valve To carry out renovation, can not ignore regardless of those relatively traditional old valve and blindly seek new. Another is that we have to work hard on product innovation, such as valve weight, size and airtight considerations from many aspects of innovation, this is also from the most fundamental place to start to solve the problem. Such as the promotion of ball valves , butterfly valves and other new types of valves, while for some remote control valves should also be stepped up efforts to promote the use of the ship to go. In those high-temperature valves, low temperature valves, pressure regulating valve, etc. should also increase the efforts to carry out effective research and development.
Third, the choice of the ship pipeline valve In the pipeline valves used in the ship there are many valve varieties and specifications, in the end how to choose is where we need in-depth analysis. First of all, we need to know the basic characteristics of the valve, such as the valve temperature resistance, pressure performance, the use of valves and pipeline circulation medium. Second, we should also be based on the actual situation to choose relatively inexpensive products to use, of course, to ensure the performance of safe and reliable under the premise of choosing the right price to install the valve. In short, the principle of compliance with the selection of ship pipeline valves is that the quality and safety are reliable and the applicability is stronger.
Conclusion With the continuous development of China's overall shipping industry, the entire pipeline valve production industry also has a relatively large-scale, and for most businesses, we not only can produce those conventional valves, you can also part of New valve design and manufacturing, but also the relative R & D and manufacturing strength is more mature. With the optimization and upgrading of the entire manufacturing industry in our country, we believe the entire marine industry will receive more and more attention and investment in the future under the great opportunity of economic and social development in the country. China's shipbuilding industry will continue to achieve excellent results , While driving the entire domestic pipeline valve industry also continue to innovate, the technical level of its pipeline valve will be faster and greater upgrade. Finally, in the planning and development of the entire pipeline valve in our country, we must make reasonable layout and achieve scientific development. Can not rush to seek new changes, we must adhere to product innovation, while the traditional model of the old product reform and upgrading of the entire industrial layout to achieve the scientific development of ideas to prevent the spread of overcapacity. I believe that in the entire good environment and the joint efforts of our business, China's ship piping valve industry will achieve the desired good results.
References [1] Wang Jinlei, Wang Li. Fluid pipeline valve selection [J]. Value Engineering, 2011 (6): 5-6.
[2] Sun Wentao. Ship lofting and production [M]. Harbin: Harbin Engineering University Press, 2010.
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