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2. Pressurization test（Pressurizing with water）:
循环泵
Circulation pump
单向阀
Check valve
压力安全阀
Pressure relief valve
阀1 阀2
Valve1
Valve2
Valve3
阀3
自来水
Tap water
注液泵
Liquid filling pump
平板集热器
Plate heat collector
automatic exhaust
膨胀罐
expansion tank
过滤器
filter
单向阀
Check valve
过滤器
filter
(Principle schematic drawing of the heat collecting system)
储液罐
Liquid tank
压力安全阀
Pressure relief valve
压力表
Manometer
阀1
Valve1 Valve2
Valve3
(Schematic drawing for the liquid filling components)
自动排气阀
valve
储水箱
water reservoir
接室内用水
connecting to the water used indoor
循环泵
circulation pump
单向阀
Check valve
阀2
Valve2
阀3
阀4
valve 4
膨胀罐
expansion tank
过滤器
filter
6
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