Caleffi 130 series low-lead brass manual balancing valves are used to measure and adjust the fluid flow rate in hydronic or plumbing circuits. The flow rate is directly determined from the pressure differential (from Venturi effect) measured across the two test ports. The valve design is "fixed orifice" with both pressure ports located upstream of adjustment plug and away from any pressure variations from turbulence as flow passes the adjustment plug - this feature makes pressure measurements and thus flow determination simpler and more accurate compared to "variable orifice" type balancing valves. Flow rate is calculated by simple formula or by easy reference to flow characteristic graph. Memory stop feature allows valve to be closed, and later reopened to the original set position. Teflon stem bearing guide prevents noise and vibration. The control stem threads remain dry at all times, and thus are not prone to seizing from scale after long in-operation periods. Stainless steel plug is highly resistant to erosion from fluid impurities.
Precise valve adjustment with 6 full turns and 10 decimal graduations allow for accurate flow setting|Stainless steel plug is highly resistant to corrosion and erosion due to continual fluid flow or fluid impurities for long operating life|Double o-rings allow the control stem threads to remain dry at all times so are not prone to seizing from scale after long in-operation periods|PTFE stem guide bearing prevents noise and vibration, particularly in severe operating conditions|Memory stop allows valve to be closed, and later reopened to the original set position
Caleffi Balancing Valve, Series: 130, 1/2 in Nominal, FNPT, 232 psi, -4 to 250 deg F, Media: Water/Glycol, Adjustable Knob Actuator, 3 in Inlet to Outlet Length, 4 in Top to Inlet Center, Brass Body, Brass Trim, EPDM Hydraulic Seal