spring loaded safety valve meaning in English

弹簧安侠工

Steam boilers and pressure vessels - spring loaded safety valves
蒸汽锅炉和压力容器.弹簧加载安全阀
Sealed spring loaded safety valve
封闭式弹簧安全阀
1 steam boilers and pressure vessels - spring loaded safety valves erratum 1
蒸汽锅炉和压力容器.弹簧加载安全阀
Spring loaded safety valves
弹簧直接载荷式安全阀
Direct spring loaded safety valve
弹簧式安全阀