... fall, the floater fall too. For normal automatic venting, open bonnet for a slow release of ... and the hole closed. If tighten bonnet, stop discharging. Usually, the bonnet should be open. ... and the hole closed. If tighten bonnet, stop discharging. Usually, the bonnet should be open. ... air vent valve application is necessary.InstallationThe automatic air venting valve should be installed vertically to ...