VersaFlow Hose Kit B — Manual Venturi-Balancing
Kit B Features
Kit B has a manual balancing valve on the return side of the coil as recommended by ASHRAE. The VersaFlow manual balancing kit features a calibrated venturi valve instead of a circuit setter. The venturi has a number of advantages over the circuit setter.
- The venturi provides 2 - 3% accuracy. With a high quality differential pressure gauge, a combined accuracy of 10% is almost always obtainable.
- The permanent pressure drop is typically 1/10 that of a conventional circuit setter. The lower pressure drop can reduce the pump head so that a smaller size pump can be selected to save energy.
Kit B includes Model UA venturi balancing valve regulator, Model YC strainer with ball valve and two Model S2/S3 hose assemblies.
Model UA is a shut-off and manual throttling venturi valve with EPDM O-ring, Teflon seat and memory stop. Stem is blowout proof with EPDM O-ring and Teflon packing with packing nut. Dual Pressure / Temperature ports are standard with an additional option available for air vent or drain valve. Ball valve end available thread or sweat – please specify.
Model YC is a combination ball valve, y-strainer and union
with seven (7) accessory port locations. 20 mesh stainless steel
strainer is removable from the valve body for inspection and cleaning without breaking the main piping.
S2/S3 fire-rated hose assembly has a braided stainless steel outer band with EPDM inner tube and brass or steel fittings. Each hose reel is tested to 450 psi.
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- The venturi balance valve is easier to use than a circuit setter. The proper flow can be determined from the flow curve shipped with the units. It is not necessary to determine the handle position or use a slide rule. Flow adjustment can be made without the trial and error of a circuit setter and, the heavy duty memory stop is easily locked to maintain the “set position” when the valve is closed and reopened.
- Several flow ranges are available in the 1/2” and 3/4” sizes so that line size valves can be used even at low flow rates. The limited flow range of a circuit setter often requires size reduction for these low flows.
- The VersaFlow balancing valve is rated at 400 PSI. Most others are rated at 200 PSI which makes them the weak link in the hook-up.