首页>
外国专利>
Blow-out preventer for gas and oil drilling - having a valve which closes automatically when pressure rises above the flushing pressure
Blow-out preventer for gas and oil drilling - having a valve which closes automatically when pressure rises above the flushing pressure
展开▼
机译:天然气和石油钻探防喷器-具有一个阀,当压力高于冲洗压力时该阀自动关闭
展开▼
页面导航
摘要
著录项
相似文献
摘要
The inlet to a packing sleeve is opened to fill and expand the sleeve by an increased flushing pressure. The valve and packing sleeve are mounted in a pipe, and may be positioned flat above the cutter.
展开▼