For hazardous liquid (toxic, flammable); controlled removal of Inboard seal leakage. Seal operates on process fluid on inboard seal; buffer fluid on outboard seal. Inboard seal handle full pressure; outboard seal runs at atmospheric or low pressure. Outboard seal can handle the same conditions as inboard seal.
shutdown for repair. 外密封只作短时间备用密封, 即用于短时间的停车维修.
Operating long term on the outboard seal will defeat the purpose
of installing dual seal. 外密封长时间的运转将失去安装双密封的意义和目的.
In such cases, a single seal is unacceptable, either a Pressurised or Non-pressurised dual seal is employed.
在这些情况下,一般不采用单封,而采用带压或不Fra bibliotek压双封5
Dual Seal Arrangements 双封排列方式
双封指不管在什么方向上,密封腔中密封数超过一个的密封排列 式.它或者使用不带压的缓冲液,或者使用带压的隔离液作为封 液。
Classical “Tandem”
典型串联密封
Classical “Double”