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。
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。
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。
Through research, it needs to develop thee-mail system of high safety and assigned package of large attachments to meet security requirements.
通过本文研究，需要开发安全性高、可实现大附件邮件分包传送的邮件系统来满足安全性需求。
Through research, it needs to develop thee-mail system of high safety and assigned package of large attachments to meet security requirements.
通过本文研究，需要开发安全性高、可实现大附件邮件分包传送的邮件系统来满足安全性需求。
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