整个热水系统中只有从批量加热热水器引水的软管、连接阀、以及接在止热阀（the Hot Out valve）上用作贯通的三通是新添加的。
The only thing new to your existing system is the hose coming down from the batch heater, the batch connect valve, and the “T” connector at the Hot Out valve to tie it all together.
蝶阀的流体特性相当于截止阀的三倍甚至更高，相当于同样尺寸的闸阀的75%。
Butterfly valves have flow characteristics three times better than globe valves and approximately 75% of an equivalent size gate valve.
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