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Moore Products 63BU-L Relay. Series 63 Constant Differential Flow Controllers | Versatile and design accommodates liquids or gases and wide range of OEM needs Simple Type: Relay

The Series 63 Constant-Differential Relays are used in conjunction with an external needle valve to provide constant volume flow rates of liquids or gases over a continuously adjustable range. For gas flow applications, compressibility must be considered if a constant mass flow is desired. Therefore, models are available for constant upstream or downstream reference pressure. For liquids, which are not compressible, the constant volume flow will also be a constant mass flow, regardless of upstream or downstream pressures. As such, mass flow is independent of pressure changes. The relay’s needle valve determines rangeability and capacity. Four models are available.

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