例句與造句

1. The two lower valves are called the master valves ( upper and lower respectively ).
2. The logical barriers in this case would be the production wing valve and the upper master valve.
3. An actuated wing valve is normally used to shut in the well when flowing, thus preserving the master valves for positive shut off for maintenance purposes.
4. The sections are clipped together with buckles, the air hoses are connected to the tubes and the hoses to a master valve joined to an air compressor.
5. With only a single swab valve, the upper master valve is usually closed to act as the second barrier, forcing the well to be shut in for a day during rig down operations.
6. It's difficult to find master valve in a sentence. 用master valve造句挺難的
7. Master valves are normally in the fully open position and are " never " opened or closed when the well is flowing ( except in an emergency ) to prevent erosion of the valve sealing surfaces.
8. The lower master valve will normally be manually operated, while the upper master valve is often hydraulically actuated, allowing it to be used as a means of remotely shutting in the well in the event of emergency.
9. The leak appears to be at a flange between a master valve and emergency shut-off, said Guy Grossman, Houston district director of the oil and gas division of the Texas Railroad Commission, which oversees natural gas storage.
10. The lower master valve will normally be manually operated, while the upper master valve is often hydraulically actuated, allowing it to be used as a means of remotely shutting in the well in the event of emergency.
11. Living up to his larger than life reputation mirrored by John Wayne in the film Hellfighters Adair approached the well and closed the undamaged master valve saying ( reputedly ) " one down four to go ".