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TOYOOKI電磁閥HB3H-A-D4K-06型：HB3H-A-D4K-06型TOYOOKI電磁閥，當入口處壓力加大時,，自動減小通徑,，減少流量的變化，反之亦然,。如果反接，這套調(diào)節(jié)系統(tǒng)就不起作用,。

而且起調(diào)節(jié)作用的閥片,，是有方向性的，反向的壓力甚至可以減少甚至封閉流量,。 既然安裝平衡閥是為了更好的供暖,，就不存在反裝的問題。

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