Protective devices shall not operate and sealing compound shall not flow out.

保护装置不应动作，并且密封剂不应流出。

When the application is more critical, and the sealing compound may fail due to high heat or pressure, NPTF Dryseal threads are used.

当密封要求严格时，密封剂可能由于高温高压会失效，这时可以采用NPTF干密封螺纹。

As special function is required, the construction of polysulfide sealing compound turns into a key procedure in project of a sewage treatment plant.

由于特殊功能要求，聚硫密封膏的施工成为某污水处理厂工程的关键工序。

The testing result shows that sealing compound performance is good, costs are low, and is suitable for static seal of pipe line and valve under different temperature conditions.

测试结果表明，该密封胶性能优良，成本低廉，可适用于不同温度条件下的管线阀门等静密封。

With NPT threads, after a wrench is applied, slight Spaces at the major and minor diameters may exist that would allow the assembly to leak and therefore a sealing compound is used to fill any gaps.

对于NPT螺纹，使用扳手上紧后，在大直径和小直径上可能允许装配后漏气，因此会使用密封剂来填充所有的间隙。