| 摘要 |
<p>The present invention relates to a drain system for preventing the back flow of fluid in a wellhead. According to the present invention, the drain system for preventing the back flow of fluid in a wellhead is capable of storing fluid and gas, drained through a drain line of a wellhead, in a casing drain drum via a drain casing line. A check valve is installed in the drain line to prevent the back flow of fluid and gas, leaked from the wellhead, towards another wellhead. The check valve is able to be made in a spring type, and control the flow of the casing drain line by preventing the back flow of fluid. Therefore, explosion, caused by an increase in pressure of the casing drain drum, is prevented.</p> |
