我们建议采用型号DET膨胀罐，美国瓦茨Governor 80球形旋塞带整体热膨胀安全阀，或一个530C刻度压力安全阀。
We suggest the use of a model DET expansion tank, the Watts Governor 80 ball cock with integral thermal expansion relief valve, or a 530C calibrated pressure relief valve.
旋塞和球形：关闭件是柱塞或球，围绕本身的中心线旋转。
Cock and ball: Turn off the prop is a plunger or a ball, rotating around its own axis.
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