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Full Opening Safety valve is a manual control ball type safety valve used to stop flow through the drill string when the drill string is being withdrawn from the well. FOSV assembled between lower Kelly sub and upper drill pipe sub. The FOSV can be opened or closed off by simply turning a special operating wrench 90° according to indicated direction. TIANHE FOSV is a dual body full-opening safety valve, that does not interfere with the running of tools such as core barrels or survey instruments. It is designed to be stabbed into the top joint of drill pipe or tubing string at the rig floor and closed quickly in case a well kicks.


Ordering Instructions
1. Diameter
2. ID
3. Thread connection
4. Working pressure

Ordering Instructions
1. Diameter
2. ID
3. Thread connection
4. Working pressure

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