Originally it was the safetyvalve for a hydraulic plant.
它最早是一家水电厂的安全闸阀。
2
Analysis of the focus in the main safetyvalve failure and hydraulic pump.
分析故障重点在主安全阀和液压水泵。
3
A calibration valve oil for hydraulic shield safety valves was formulated by a base oilobtalned from the distillate of a deep-refining paraffinic crude with qualified additives.