Delta Controls - Model 623 - Dual Stage Flow Switch - Datasheet

Flow Switch, Low Flow, Safety Shower and Eye Wash Station Service. The Delta Controls Model 623 Dual Stage Flow Switch actuates at low-flow rates and prevents high pressure drops at 50 times the actuation rate. The switch output is used for alarm or control. The 623 consists of two sections: a flow sensing paddle and a pressure operated flow bypass valve. As the flow rate increases from zero, the fluid flows through a restriction nozzle and impinges against a paddle, which rotates at the specified rate. The switch is magnetically coupled to the paddle and actuates as the rotation occurs. When the actuation rate is exceeded, the flow bypass valve opens to allow the additional fluid flow to bypass the restriction nozzle. The pressure drop is limited to a low value at highflow rates.