Caleffi 3/4" Female NPT Low Lead Manual Balancing Valve (5.1 Cv)

Caleffi 130 series low lead, 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 pressure 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 a flow characteristic graph. The 130 series balancing valve can be supplied with optional insulation shells, purchased separately, to minimize heat loss or eliminate condensation in chilled water applications. Features: Fixed orifice. DZR low-lead brass valve body. Multi-turn adjustment range. Number of adjustments: 5 Memory stop feature. Stai...