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Bell-Gossett (english metric)
Bell & Gossett - Pumps, valves, heat exchangers and accessories for plumbing, wastewater and HVAC
venturi balance and flow measurement valve with ball/butterfly valve english metric
https://bellgossett.com/flow-balancing/manual-balance-valves/venturi-balance-and-flow-measurement-valve-with-ballbutterfly-valve/

Bell-Gossett (english metric)
Bell & Gossett - Pumps, valves, heat exchangers and accessories for plumbing, wastewater and HVAC
flow measurement english metric
https://bellgossett.com/flow-balancing/flow-measurement/#grid