Answer / dhananjayk

Volume booster is  using where we need quick opning of valve or where big dom which need more air volume for operating valve in time

Answer / kmns kiran

Volume booster is for quick opening/Closing of shut of valves,
Quick Drain (vent) valves (QDV) for quick Closing of shut of valves.
Generally QDV'S are used for drain valve applications (air to close applications)

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