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To change the limit of LPR test valve which need annulus pressure to keep static in opening period,a new model pressure controlled full bore testing valve which is applied for our oilfields' features is developed.

为改变目前LPR压控测试阀在开、关井过程中需要保压的局限性 ,研发了一种适应我国油田特点的新型全通径压控测试阀。

Research and implementation of safety communication based on PROFIBUS;

基于过程现场总线的安全通信的研究与实现

Three techniques are presented for realizing peer to peer safety communication of computer local network.

论述在计算机局域网上实现对等安全通信的 3种技术 ,以及在因特网环境下 ,利用 TCP/ IP协议实现以节点之间信息交换为主要特征的对等安全通信模型 。