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Delta Controls Model 623 Datasheet 
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Application
Operating Principle
The Delta Controls Type 623 is a dual stage flow switch that actuates at low flow rates yet does not produce unacceptably high pressure drops at 50 times the actuation rate. The Type 623 consists of two sections; a flow sensing target and a 2 PSI pressure operated flow bypass valve.
As the flow rate begins to increase from zero, the fluid flows only through a restriction nozzle and impinges against a target. The target rotates at the specified flow rate. A switch is magnetically coupled to the target and actuates when the rotation occurs. The switch output is used for alarm or control. The flow valve opens when the flow rate exceeds the actuation rate. This allows the additional fluid flow to bypass the restriction nozzle. The pressure drop is thus limited to a low value at high flow rates.
Highly reliable. Primary usage is commonly installed on each safety shower-eye wash station in the plant. Alarms at a continuously manned station (such as the control room) so that help can be immediately dispatched to a person in need of assistance.
The model 623A,
with 150# R.F. Flanged connections is designed specifically for such applications
as safety shower / eye-wash applications.
The model 623B is similar, but is available in a
wider range of materials and pressure ratings.
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