Complaint
Full Opening Safety valve is a manual control ball type safety valve used to stop flow through the drill string. FOSV assembled between lower Kelly sub and upper drill pipe sub. In the drilling operation, in order to avoid malignant accidents, the FOSV shall be connected between drill pipes in drilling process. It can be opened or closed off by simply turning a special operating wrench 90° according to indicated direction.If the Kelly is not made up in the drill string and flow occurs, crew members can insert the safety valve in the drill string. This procedure is called Stabbing of full opening valve as a large in inside opening as possible. When fully open, flow from the drill pipe passes through the valve with no additional restriction. This relatively large opening allows the crew to stab the valve against pressure coming out of the drill string.
| Type | Exradius OD Inch (mm) | Inradius ID Inch (mm) | Connecting thread API | working pressure MPa |
| FOSV79 | 3-1/9 (79) | 4/5 (20) | 2-7/8HT PAC | 35-105 |
| FOSV89 | 3-1/2 (89) | 1-3/16 (30) | NC26 | |
| FOSV111 | 4-3/8 (111) | 1-37/64 (40) | NC31 | |
| FOSV121 | 4-3/4 (121) | 1-31/32 (50) | NC38 | |
| FOSV127 | 5 (127) | |||
| FOSV133 | 5-1/4 (133) | 2-11/25 (62) | NC40 | |
| FOSV159 | 6-1/4 (159) | 2-4/5 (71) | NC46 | |
| FOSV165 | 6-1/2 (165) | 2-13/16 (71.4) | NC50 | |
| FOSV168 | 6-5/8 (168) | |||
| FOSV190 | 7-1/2 (190) | 3 (76.2) | 5-1/2FH |
1. Available with a wide variety of sizes and end connections
2. Two piece body with full drift bores
3. Operating wrench and thread protectors included
4. Major repair kits available for every valve
5. Comes with certified test report
6. Identifiable open and close markings
7. Can be H2S corrosion resistant as per NACE MR0175
