full welded ball valve

According to the technological characteristics and control requirements of block valve in urban natural gas high-pressure pipeline,the technical requirement for selection of directly buried fully welded ball valve and its electro-hydraulic actuating mechanism is put forward from the point of view of consumers.根据城市天然气高压管网线路截断阀的工艺特点及控制要求,从使用方的角度,提出直埋全焊接球阀及其电液联动执行机构的选用技术要求。rFP汉语字典

This paper gives an introduction to the design and manufacture of the fully welded steel girder briges.介绍了我国90年代全焊钢梁结构设计要点，制造方法和质量控制。rFP汉语字典

This article concisely introduces the region and range of full penetration welding in XJ23-1 FPSO hull based on BV rules.全焊透是浮式生产储油装置(FPSO)船体结构焊接中非常重要的一种焊接形式,主要用于高应力区和特殊结构区域的焊接。