蝶形弹簧安全阀是锅炉压力容器的重要安全附件，用于防止系统压力超过允许的极限值。
Butterfly spring valves are important safety attachments of boiler pressure vessels, they are used to prevent system pressure from exceeding allowable limit value.
本实用新型是一种自润滑弹簧顶尖，属于机床附件。
The utility model relates to a self-lubrication spring centre, belonging to a machine tool accessory.
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