本文讨论了自动阀的三种基本设计:1）液压差动活塞设计，2）液压差动阀瓣设计，3）隔膜操作阀。

Three basic designs of automatic valves are discussed in this paper: 1) hydraulic differential piston design, 2) hydraulic differential disc design, 3) the diaphragm operated valve.