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方钻杆防溅阀是一种在接单根或起钻卸开方钻杆之后避免钻井液从方钻杆水眼内流到钻台上，而且能保护操作环境不受钻井液污染的必备工具之一。
The Kelly splash-proof valve is a necessary tool preventing fluid flowing from Kelly to drill floor and keeping the operating environment from being contaminated by fluid when making a connection or Kelly is taken out of hole and discharged off.
技术规格及参数
| 外径(mm) |
长度(mm) |
接头螺纹(in) |
弹簧载荷(KN) |
关阀压力(Map) |
拉杆移动距离(mm) |
| 上端 |
下端 |
最小 |
最大 |
极限 |
| 165 |
570 |
4 1/2"IF Box |
4 1/2"Pin |
1 |
2.2 |
2.5 |
1 |
30 |
| 203 |
790 |
5 1/2"FH Box |
5 1/2"Pin |
1 |
2.2 |
2.78 |
1 |
30 |
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