Butterfly spring valves are important safety attachments of boiler pressure vessels, they are used to prevent system pressure from exceeding allowable limit value.

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。

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Full set of pipe orifice, valves, flanges and counter flanges, fasteners and all other attachments, all water release valves, gas release valves and safety valves.

全套管道孔板、阀门、法兰及反法兰、紧固件及其它所有附件，所有放水、放气阀门及安全阀。

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A safety clip or retainer must be installed to prevent attachments, such as chisels on a chipping hammer, from being unintentionally shot from the barrel.

必须安装保险夹或护圈，以防止配件(如气錾的凿刀)从凿筒中意外飞出。

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