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Explain: Why do we put an air release valve after a pressure-reducing valve? Why do we...

Explain:

  1. Why do we put an air release valve after a pressure-reducing valve?
  1. Why do we add an air release valve after a groundwater pump?
  1. Why the flow in water distribution networks is pressurized?
  1. Mention the key differences between butterfly valves and gate valves

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