Caleffi 519502A

Caleffi 519 Differential Pressure By Pass Valve, 3/4 Inch NPT, 9 gpm, 150 psi

Caleffi 519502A

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 by-pass the differential pressure created by the pump as the zone valves close, thus eliminating water hammer noise. The 519 series is available with conventional NPT and sweat union connections. Also available for size 3/4", the Presscon copper tailpiece with union nut makes installation and maintenance fast, easy and efficient. Special slots in the EPDM O-ring allows fluid to leak during system testing if unpressed and provide a perfect leak proof seal when completely pressed.

Brand Name      :      Caleffi
Connection Type      :      NPT
Dimension      :      5-11/16 Inch Length
Flow Rate      :      9 gpm
Includes      :      Graduated Scale
Item Name      :      Differential Pressure By Pass Valve
Material      :      Brass Body and Valve Plug, Stainless Steel Spring, EPDM Valve Plug Gasket and O-Ring Seal, NBR Union Seal and ABS Control Knob
Model      :      519
Nominal Size      :      3/4 Inch
Pressure Rating      :      150 psi Maximum Working, 2 - 10 psi Adjustable
Temperature Rating      :      32 - 230 deg F
  • pdf Installation Sheet https://cdn-assets.unilogcorp.com/ASSETS-H/DOCUMENTS/ITEMS/EN/UNI-160669_Instal.pdf
  • pdf Specification Sheet https://cdn-assets.unilogcorp.com/ASSETS-H/DOCUMENTS/ITEMS/EN/UNI-160669_Spec.pdf