旧式三通水门，常生障碍，调节不灵，为勘探中久未解决的问题，我队对此问题非常重视，曾多次研究和改进，现利用旧废料试制了此种针阀三通开关（如图）。这种针阀式三通水门经过一个较长时间的试验使用，证明效果良好，有实用推广价值。其优点是：（1）构造简单，制造加工容易；（2）不易 The old-style three-way water gates, barriers to permanent illness, and poor regulation are issues that have not been resolved in the exploration. Our team attaches great importance to this issue and has studied and improved many times. We have trial-produced such needle valve three-way switches using old waste materials ( Figure). The needle valve type three-way water gate has been used for a long period of time and has proved to be effective and practical. Its advantages are: (1) simple structure, easy manufacturing and processing; (2) not easy