Incremental circulating valve is a kind of by-pass valve,connect it close to drill bit before drilling oil and gas layer,and when drill bit was blocked in killing well operation,the by-pass valve can set up a new circulation channel and continue to implement killing well operation.
| Model | OD | ID | Ball Diameter | Connection |
| mm (inch) | mm (inch) | mm(inch) | ||
| JZX105 | 105(4-1/8) | 38(1-1/2) | 38(1-1/2) | NC31 B×P |
| JZX121 | 121(4-3/4) | 50.8(2) | 48(1-7/8) | NC38 B×P |
| JZX160 | 160(6-5/16) | 50.8(2) | 65(2-9/16) | NC46 B×P |
| JZX178 | 178(7) | 57.2(2-1/4) | 65(2-9/16) | 5-1/2FH B×P |
| JZX203 | 203(8) | 57.2(2-1/4) | 70(2-3/4) | 6-5/8REG B×P |
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