对于空气和蒸汽用安全阀，多采用不封闭式安全阀。
Used for air and steam safety valve, safety valve used is not closed.
综合比较来看，封闭式支架要优于不封闭支架；马蹄形或方环形支架要比半圆拱等支护形式好。
Compared comprehensively, enclosed supports are better than non-enclosed supports; supports of square annular shape or "u" shape are better than supports of semicircle arch.
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