| 摘要 |
PURPOSE: A relief valve for a chemical pipe system is provided to arrest metal corrosion, to equalize the set pressure of the pipe system and to be not in need of a periodic maintenance. CONSTITUTION: During a process of floating a chemical, the pressure of the chemical is less than the resilient force of a compressed spring(13a) and the spring recovers the resilient force to pressurize a valve stem(12) and a diaphragm seat(20) downward. Then a pipe channel is closed again. Therefore, the chemical doesn't leak while the pipe channel is opened and the compressed spring is prevented from being corroded. A diaphragm seat type relief valve is variously applied to all kinds of chemical pipe systems.
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