Full Opening Safety Valve
Full opening safety valve is a hand control valve in drill string circulating system, and it is one of the effective tools to prevent blowout. In the drilling operation, in order to avoid malignant accidents, full opening safety valve shall be connected between drill pipes in drilling process. The special wrench of full opening safety valve may rotate
90 °according instruction to switch on and off. In well repair operation, whether need to lift the drill pipe or not, it is best to install opening safety valve as prevention.
Specification
Model | OD | ID | Conn. | Working Pressure |
Qk79 | 3 1/8 (79) | 4/5 (20) | 2 7/8HTPAC | 35,70,105 |
QK89 | 3 1/2 (89) | 1 3/16 (30) | NC26 | |
QK111 | 4 3/8 (111) | 1 37/64(40) | NC31 | |
QK121 | 4 3/4 (121) | 1 31/32(50) | NC38 | |
QK127 | 5 (127) | |||
QK133 | 5 1/4(133) | 2 23/64(6O) | NC40 | |
QK159 | 6 1/4(159) | 2 51/64(71) | NC46 | |
QK165 | 6 1/2(165) | 2 13/16(71.4) | NC50 | |
QK168 | 6 5/8(168) | |||
QK190-1 | 7 1/2 (190) | 3(76.2) | 5 1/2FH | |
QK190-2 | 7 1/2 (190) | 3 15/64(82) | NC50 |
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