| 摘要 |
PURPOSE:To obtain a safety valve operatable reliably under specific pressure by providing a push rod for opening/closing two valve bodies through fluid pressure. CONSTITUTION:Upon working pressure rise in a conduit 4, the working pressure at a borehole 3e will increase to push up a push rod 3g and a valve body 3c while resisting against the energizing force of spring 3n thus to bring the valve body 3c near to the valve seat 3b while upon reaching to specific pressure level, the valve body 3c is seated in the valve seat 3b. Furthermore, a valve body 3m is pushed up to the valve seat 3k through a push rod 3g thus to release the output port 3j to the atmosphere. Upon further working pressure rise, the pressure in a chamber 3q will increase the force for pressing the valve body 3c against the valve seat 3b thus to stop the pressure of fluid communicating with the pressure gauge 1 completely by means of the valve body 3c.
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