6 减压阀.ppt

减压阀 为何进行减压 为何进行减压 需求 需求 总结 传统型减压阀 TLV 减压阀型号 直接作用式减压阀 先导式减压阀 COS-系列 减压站 减压站 减压站 减压站 减压站 减压站 减压站 减压站 直接作用式减压阀的应用(TLV DR20) 直接作用式减压阀的应用 溢流阀 溢流阀 溢流阀 溢流阀 This is the last slide in this presentation.Please click the INDEX icon to return to the OVERVIEW page. 自由浮球式蒸汽疏水阀 Shall we start with need of pressure regulation ? OK Let’s see a very basic structure of steam plants. As you would remember a boiler is installed and delivery piping system are extended to each steam equipment Very simply isn’t it? Steam is generated at the boiler and delivered through the piping system At what pressure ? The pressure at boiler is very carefully designed in order to minimize the piping system cost, covering all requested pressures at equipments, this is because the volume is steam is this means Higher pressure significantly allow smaller piping size, thus cost effectiveness So steam is supplied at relatively high pressure On the other hands pressure requested at steam equipments or some branches are quite low because of the design Also quite different among these equipments and lines. Yes some devise is needed That is pressure regulator ! I would like to show you more specific sample, that is a heat exchanger on behalf of steam equipments, Most likely heated product temperature is controlled and quite often the strong relation between temperature and pressure is considered and supplied to the system as steam temperature is controllable by pressure change A pressure regulator is simply installed as temperature control valve of supplied steam in case targeting product temp Can be obtained by this. These are typical and direct reason why a regulator is installed here and there at steam plants Let’s see the functions or roles at the pressure reduction stage where pressure is reduced Firstly, as the original request , the reduced pressure needs maintaining against any disturbances. Such as primary pressure change and steam load (demand) change. The reduced pr