該產品是控制壓力機制動器、離合器正常工作的一種專用氣動元件。當系統中或閥本身出現故障時,它能使出口端口的氣壓降低到入口壓力的2%之下,信號反饋使相應開關跳閘從而使壓力機進束停車, 以確保設備及人身安全。?This valve is used to contorl brake /clucth of the press. It can stop the press immediately when the system or valve self fuilsvy reduce pressure of outlet bess than 2% of inlet.