应该安装蒸汽安全阀，为设备提供紧急保护。
Steam safety valve should be installed to provide emergency protection of equipment.
此外，在紧急回流或出现水锤现象时，如果第二止回阀受到污染，则这种安全阀可能出现释放（喷溅）。
Otherwise, such relief ( spitting) can occur when the second check is fouled during emergency backflow or resulting from a water hammer condition.
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