随我国国民经济的高速发展,许多先进、自控的大型化肥装置相继出现,尤其近十年来国外引进的大型化肥、尿素、乙烯等装置的投产,更加快了建设步伐,形势可喜。大型装置中的仪表调节阀,在生产工艺过程中起到控制流体的流量、压力、温度等工艺参数的作用。以它的流量特性促使整个庞大装置动作协调,将生产工艺处于最优化的状态,用途极为广泛。调节阀能够准确地控制工艺参数,其原 With the rapid development of our national economy, many advanced and self-controlled large-scale chemical fertilizer plants have emerged one after another. In particular, the large-scale fertilizer, urea and ethylene plants imported from abroad have put into operation more quickly in the recent 10 years and the situation is gratifying. Meters in large installations regulating valve, in the production process to play a role in controlling fluid flow, pressure, temperature and other process parameters. With its flow characteristics to promote the coordinated action of the huge unit, the production process in the most optimized state, the use of a very wide range. Regulating valve can accurately control the process parameters, the original