密封有机械密封和填料密封两种形式，对于高温、高粘稠度及腐蚀性较强的介质，选用填料密封。
Mechanical seals and sealing filler sealing has two forms, for high temperature, high viscosity and corrosive medium, choose packing seal.
选用碳素纤维填料和膨胀石墨填料混合使用，密封效果良好。
Two kinds of packing: i. e. carbon with fiber and soft graphite are used. The sealing effect is excellent for high pressure boiler F. W. P.
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