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- The differential pressure by-pass valve is used in systems with a fixed speed circulating pump supplying several zones controlled by two way zone valves. This valve ensures that the head pressure of the pump is proportional to the number of two way valves being closed. It will bypass the differential pressure created by the pump as the zone valves close, thus eliminating water hammer noise.
Caleffi Differential Pressure Valve, Bypass, Series: 519, 1 in Nominal, FNPT x C, 150 psi, 32 to 230 deg F, 40 gpm, Media: Water/Glycol, Control Knob Actuator, Brass Body, Stainless Steel Trim, EPDM O-Ring Seal, 6-5/8 in H
- Body MaterialBRASSEnd StyleFNPT x CFlow Rate40 gpmNominal Size1 inPressure Rating150 psiActuator TypeControl KnobDimensions6-5/8 in HManufacturerCaleffiManufacturer #519609AMediaGlycol / WaterSeries519Softgoods MaterialEPDM O-Ring SealTemperature Rating32 to 230 deg FTrim MaterialStainless SteelTypeBypass