FeaturesFive signal to output ratios meet most control element requirements.Control sensitivity of water column allows use in precision applications.Large Supply and Exhaust Valves provide high forward and exhaust flows.Soft Supply and Exhaust Valve seats minimize air consumption.A balanced Supply Valve minimizes the effect of supply pressure variation.An Aspirator Tube compensates downstream pressure droop under flow conditions.A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.Optional remote feedback port minimizes pressure drop at final control element under flow conditions.The optional adjustable By-pass Valve lets you tune for optimum dynamic response. (1:1 ratio only)Unit construction lets you service the WBA45 without removing it from the line.