One valve is the pressure-relief valve, which prevents pressure in the tank from rising too high . 一个是减压阀,以防止油箱中的压力过高。
This system is used for safety reasons when one valve must not be opened without a second valve first being closed 这种系统用于这样的安全需要,如果另一个阀门没有先关闭,则这个阀门不得开启。
For critical uses one valve could be maintained as a stand - by for use when repairs were being made to the other valves in the group 对于重要的应用场合,可以保持一个阀门作为备用,以备组群中的其它阀门进行维修。
Rose eggplant : leaf of dry rose of one valve valve twists strip , produce the aubergine be similar in form or appearance of curved turn with south , call a rose eggplant so 玫瑰茄:一瓣瓣干玫瑰花瓣捻成长条型,和南方产弯弯的茄子形似,所以称玫瑰茄。
By comparing the dry plate pressures drop and distributions of velocities simulated on single valve with those of double valves , it was found that there was intense turbulence in the flow fields around fixed - valve , there were eddy areas between valve side orifices and tray wall , there were eddies above the valves too , these led to the complex behaviors of gas perforating valve , these had a great effect on the gas - liquid mass transfer process . at the same time , in order to prevent the disadvantageous effect of gas between one valve with another on the gas - liquid mass transfer , it was very effective to change the fields of gas perforating valve by folding the edges of valve 通过对数值模拟得出的单阀和双阀塔板的干板压降及流场速度分布分析对比后发现,固定阀周围流场存在较强的湍动,阀侧孔与塔板壁面区域以及阀体的上方空间存在明显的涡流区,使气体穿阀后的行为变得复杂,并对气液传质过程产生重大影响;模拟结果表明,为防止和削弱固定阀间的对冲造成的“死区”对传质带来的不利影响,通过折边来改变气体的气路是非常有效的,模拟值与实验值基本得到吻合。
The operation of oil tins section is the intermission and much flow operation , namely one oil tin maybe has ten or more flow operation . sometimes is single flow operation , sometimes is some parts flow combination operation , so open wrong one valve it can take place beat all accident 石油罐区操作一般为间歇和多流程操作,即一个罐组、甚至一座储油罐都可能有十个、数十个流程操作,有时是单流程操作,有时是部分流程的组合操作,开错一个阀门,就可能发生意想不到的跑串事故。