Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.
止回阀与蝶阀的连接是经常发生的事，通常需要在这两种阀门之间加上一节短短的阀槽。
The Butterfly Primorac carbon was popular throughout the 1990's with players trying their first carbon style blade, as well as many top players.
蝴蝶普碳流行于90年代伴随着玩家们尝试他们的第一只碳素底板，包括很多顶级选手。
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