TECHNICAL BULLETIN PRODUCT INQUIRY
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1 TECHNICAL BULLETIN PRODUCT INQUIRY Air-Tight Butterfly Valves GENERAL NuAire air-tight Butterfly Valves are available in a wide variety of sizes and configurations to direct and control airflow in heating, exhausting and air conditioning installations. The air-tight butterfly valve design features all stainless steel construction and silicon gasketing for high reliability. In addition, each valve is individually pressure tested to assure gas tightness to 2 inches of water. Each air-tight butterfly valve incorporates a single belled and enlarged to accommodate the nominal duct diameter for ease of installation. NuAire offers two general categories of air-tight butterfly valves: - Manual Control - Motorized Control Both air-tight butterfly valves offer the same quality and reliability features with the only difference being the control method of the valve. Manual Control The manual air-tight butterfly valve incorporates a lockable handle to open and close the valve. The heavy duty handle consists of a pointer to indicate percent open, setscrew to lock valve position desired and PVC cover for operator comfort. Below is a list of available manual air-tight butterfly valves. 1. Manual Air-Tight Butterfly Valves Nominal Valve NuAire Model Diameter Number 6" Dia. NU " Dia. NU " Dia. NU " Dia. NU " Dia. NU " Dia. NU TB0001 PG 1 OF 14
2 Performance Specifications To apply these air-tight butterfly valves, additional information is provided. Construction Gas Tightness Pressure Loss Valve Body: Valve Plate: 14 GA Type 304 Stainless Steel 16 GA Type 304 Stainless Steel (triple layer construction) Valve Gasket: Silicon Hardware: Stainless Steel Each valve is pressured tested to hold 2 inches H 2 O for a minimum of 10 minutes. An additional water leak test is performed by filling the valve with a minimum of 3 inches of water and observing for leakage for a minimum of 10 minutes. The following charts indicate the static losses for each valve diameter. Each chart indicates the valve plate position (30, 45, 60, 75 ) with respect to the given CFM which then corresponds to the static loss. TB0001
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10 Motorized Control The automatic air-tight butterfly valve features the use of Belimo R Actuators. Several varieties of Belimo Actuators are available depending upon the application. Below is a list of available motorized air tight butterfly valves with the associated Belimo part number in parenthesis. 1. Motorized Air-Tight Butterfly Valve Modulating High Torque (SM24-V) Nominal Valve Diameter NuAire Model Number 8" Dia. NU " Dia. NU " Dia. NU R Belimo - Belimo Aircontrols (USA) Inc. TB0001
11 2. Motorized Air-Tight Butterfly Valve DC Modulating High Torque (SM24-SR) (Compatible w/most Commercial (*GM24-SR) Control Systems) Nominal Valve NuAire Model Number Diameter 6" Dia. NU " Dia. NU " Dia. NU " Dia. NU " Dia. *NU " Dia. *NU *GM24-SR is identical to the SM24-SR except it has a higher torque availability at 266 in. lb. minimum. 3. Motorized Air-Tight Butterfly Valve On/Off High Torque (SM-24) Nominal Valve Diameter NuAire Model Number 6" Dia. NU " Dia. NU " Dia. NU " Dia. NU TB0001
12 4. Motorized Air-Tight Butterfly Valve DC Modulating High Torque With Spring Return (AF24-SR US) Nominal Valve NuAire Model Diameter Number 6" Dia. NU " Dia. NU " Dia. NU " Dia. NU TB0001
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14 Installation NuAire air-tight butterfly valves can be installed using standard HVAC duct connection techniques. To assure a tight connection, NuAire recommends the use of silicon RTV. NuAire also recommends the use of a neoprene sleeve (NuAire neoprene connection collar Part #NU ) on at least one side of the valve connection. The neoprene sleeve facilitates the potential removal of the valve for service. Below, figures 1 & 2 illustrate typical air-tight butterfly valve installations. TB0001
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