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Guys, what does this symbol mean? I’m a complete beginner and need some guidance

2020-08-20View Original

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As shown in the figure, the circular symbols inside the green and red circles are not indicated either in the homepage image - -
Reply #22020-08-20
The red expansion joint is visible, while the green one isn’t
Reply #32020-08-20
I agree with the red expansion joint; is the green one simply a mistake in the drawing? . . Haven’t seen it
Reply #42020-08-28
If this is the volume pump, the component within the green circle might be the pump outlet damper

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