COMBINATION AIR VALVE
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1 MINING DIVISION COMBINATION AIR VALVE FOR HIGH FLOW D-6NS SERIES DESCRIPTION The D-6NS Series Combination Air Valve has the features of both an air release valve and an air & vacuum valve. The air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressure. The air & vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This valve will open to relieve negative pressures whenever water column separation occurs. MAIN FEATURES All main flow cross-sections are equal or greater than the nominal port area. Two additional NPT ports for the connection to gauges, testing and draining. Aerodynamic design enables high flow rates of air both at intake and at discharge. Reliable operation reduces water hammer incidents. Dynamic design allows for high velocity air discharge while preventing premature closure. Special orifice seat design: Stainless Steel and E.P.D.M. rubber assures long-term maintenance-free operation. NSF 61 certified. Screen protected outlet - upper screen is protected with a protective cover. AIR RELEASE COMPONENT Body made of high strength materials. All operating parts are made of specially selected corrosion-resistant polymer materials. Large sized air release orifice: - Dramatically reduces the possibility of obstruction by debris. - Discharges high air flow rates. - One size orifice for a wide pressure range, achieved by a patented rolling seal mechanism. VALVE SELECTION Size Range: 2-1 Combination Air Valve for High Flow - Non Slam D-6NS These valves are manufactured with flanged ends to meet ASA standard (D6 NS ASA 15, D62 NS ASA 3) or any requested standard. The 2 valve is also available with a threaded NPT male connection. The automatic air release component and the air & vacuum component are available as separate units. When ordering, please specify: model, size, working pressure, threads standard and type of liquid.
2 D-6NS SERIES SPECIFICATIONS Working pressure range: D-6 NS: 3-25 psi. D-62 NS: 3-36 psi Testing pressure for the air valve: 1.5 times its working pressure. Maximum working temperature: 14 F Maximum intermittent temperature: 194 F FBE coating, both interior & exterior, in accordance with standard DIN MODEL NUMBER AND FLANGE TYPE MODEL # 65D6C2TNS 65D62CNS 65D63CNS 65D64CNS 65D66CNS 65D68CNS 65D61CNS 65D622NS 65D623NS 65D624NS 65D626NS 65D628NS 65D621NS SIZE 2" 2" 3" 4" 6" 1 2" 3" 4" 6" 1 CONNECTION MNPT 15 lb. Flg. 15 lb. Flg. 15 lb. Flg. 15 lb. Flg. 15 lb. Flg. 15 lb. Flg. 3 lb. Flg. 3 lb. Flg. 3 lb. Flg. 3 lb. Flg. 3 lb. Flg. 3 lb. Flg. PSI OPERATION The 65D6-C HF NS Series Combination Non-Slam Air Valve is a surge-dampening, slam-preventing, 3-stage combination air valve. The air valve provides high capacity vacuum protection and, at the same time, efficient surge suppression. At sudden drainage and/or water column separation (sudden pump trips or valve closure, for instance), the air & vacuum orifice admits air at high flow rates, thus preventing vacuum. As the water column and/or pressure wave returns, large volumes of air are discharged at high velocities, raising the non-slam disc, partially closing the air & vacuum orifice and allowing air to exhaust slowly through the smaller orifice of the nonslam disc. This slowly exhausting air pocket dampens the slam of the returning water column, thus suppressing the pressure surge. As the water flow arrives at a much slower rate, dampened by the slower air discharge, it buoys up the main float, gently closing the air & vacuum component of the air valve. The air release component continues releasing air while the pipeline and the air valve are pressurized. DIMENSIONS AND WEIGHTS SIZE DIMENSIONS (IN) A B WEIGHT (LBS.) ORIFICE AREA (IN 2 ) AIR-VAC AUTO (D6NS) AUTO (D62NS) 2 Threaded 8 13 / / Flanged 8 13 / / / / /16 28 ½ / / /
3 D-6NS SERIES SPECIFICATIONS FOR 2 NO. PART 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Resicoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Nut & Washer NSF 61 Certified STST UNS 34 4 Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 5 Bolt NSF 61 Certified STST UNS 34 6 Screen NSF 61 Certified STST UNS 34 7 Non-Slam Disc NSF 61 Certified STST UNS Ring NSF 61 Certified STST UNS Bolt & Nut NSF 61 Certified STST UNS 34 1 Cover Ductile Iron ASTM A / Resicoat RT R4 11 Orifice Seat NSF 61 Certified STST UNS Orifice Seal NSF 61 Certified E.P.D.M. 13 O-Ring NSF 61 Certified NBR 7 14 Float NSF 61 Certified STST UNS 316 / 15 Plug NSF 61 Certified Reinforced Nylon 16 Body Ductile Iron ASTM A Resicoat RT R / Resicoat RT R4 SPECIFICATIONS FOR 3 NO. PART 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Resicoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Nut & Washer NSF 61 Certified STST UNS 34 4 Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 5 Bolt NSF 61 Certified STST UNS 34 6 Screen NSF 61 Certified STST UNS 34 7 Plug NSF 61 Certified Reinforced Nylon 8 Non-Slam Disc NSF 61 Certified STST UNS Ring NSF 61 Certified STST UNS Cover Ductile Iron ASTM A / Resicoat RT R4 11 Orifice Seat NSF 61 Certified STST UNS Orifice Seal NSF 61 Certified E.P.D.M. 13 O-Ring NSF 61 Certified NBR 7 14 Bolt & Nut NSF 61 Certified STST UNS Float NSF 61 Certified STST UNS 316 / 16 Body Ductile Iron ASTM A / Resicoat RT R4
4 D-6NS SERIES SPECIFICATIONS FOR 4 NO. PART 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Resicoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Nut NSF 61 Certified STST UNS 34 4 Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 5 Bolt NSF 61 Certified STST UNS 34 6 Screen NSF 61 Certified STST UNS 34 7 Plug NSF 61 Certified Reinforced Nylon 8 Ring NSF 61 Certified STST UNS Non-Slam Disc NSF 61 Certified STST UNS Cover Ductile Iron ASTM A / Resicoat RT R4 11 Orifice Seat Stainless Steel DIN 7981 C A2 12 Orifice Seal NSF 61 Certified E.P.D.M. 13 O-Ring NSF 61 Certified NBR 7 14 Bolt & Nut NSF 61 Certified STST UNS Float NSF 61 Certified STST UNS 316 / 16 Body Ductile Iron ASTM A / Resicoat RT R4 SPECIFICATIONS FOR 6 NO. PART 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Resicoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Lifting Ring Carbon Steel 4 Bolt & Washer NSF 61 Certified STST UNS 34 5 Nut & Washer NSF 61 Certified STST UNS 34 6 Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 7 Nipple & Coupling NSF 61 Certified STST UNS 34 8 Screen NSF 61 Certified STST UNS 34 9 Ring NSF 61 Certified STST UNS O-Ring NSF 61 Certified NBR 7 11 Bolt NSF 61 Certified STST UNS Bolt & Nut NSF 61 Certified STST UNS Cover Ductile Iron ASTM A / Resicoat RT R4 14 Non-Slam Disc Cast Iron ASTM A48 CL.35B / Reslcoat RT R4 15 Bolt & Nut NSF 61 Certified STST UNS Orifice Seat Stainless Steel DIN 7981 C A2 17 Orifice Seal NSF 61 Certified E.P.D.M. 18 Test Cock + Adaptor NSF 61 Certified STST UNS Float NSF 61 Certified STST UNS 316 / 2 Plug NSF 61 Certified Reinforced Nylon 21 Body Ductile Iron ASTM A / Resicoat RT R4
5 SPECIFICATIONS FOR NO. PART D-6NS SERIES 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Resicoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Nipple & Coupling NSF 61 Certified STST UNS 34 4 Test Cock + Adaptor NSF 61 Certified STST UNS O-Ring NSF 61 Certified NBR 7 6 Lifting Ring Carbon Steel 7 Bolt & Washer NSF 61 Certified STST UNS 34 8 Nut & Washer NSF 61 Certified STST UNS 34 9 Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 1 Screen NSF 61 Certified STST UNS Bolt NSF 61 Certified STST UNS Ring NSF 61 Certified STST UNS Bolt & Washer NSF 61 Certified STST UNS Cover Ductile Iron ASTM A / Resicoat RT R4 15 Non-Slam Disc Cast Iron ASTM A48 CL.35B / Resicoat RT R4 16 Bolt & Nut NSF 61 Certified STST UNS Orifice Seat Stainless Steel DIN 7981 C A2 18 Orifice Seal NSF 61 Certified E.P.D.M. 19 Float NSF 61 Certified STST UNS 316 / 2 Plug NSF 61 Certified Reinforced Nylon 21 Body Ductile Iron ASTM A / Resicoat RT R4 SPECIFICATIONS FOR 1 NO. PART 1 S-5-C Cast Iron ASTM A-48 CL.35B / Resicoat RT R4 S-52 Ductile Iron ASTM A / Reslcoat RT R4 2 Discharge Outlet NSF 61 Certified STST UNS Lifting Ring Carbon Steel 4 Bolt & Washer NSF 61 Certified STST UNS 34 5 Nipple & Coupling NSF 61 Certified STST UNS 34 6 Bolt NSF 61 Certified STST UNS 34 7 Screen NSF 61 Certified STST UNS 34 8 Ring NSF 61 Certified STST UNS Non-Slam Disc Cast Iron ASTM A48 CL.35B / Reslcoat RT R4 1 Orifice Seat Stainless Steel DIN 7981 C A2 11 Orifice Seal NSF 61 Certified E.P.D.M. 12 Float NSF 61 Certified STST UNS 316 / 13 Body Ductile Iron ASTM A Nut & Washer NSF 61 Certified STST UNS Screen Cover Cast Iron ASTM A48 CL.35B / Resicoat RT R4 16 Test Cock & Adaptor NSF 61 Certified STST UNS Cover Ductile Iron ASTM A / Resicoat RT R4 18 O-Ring NSF 61 Certified NBR 7 19 Bolt & Nut NSF 61 Certified STST UNS 34 2 Plug NSF 61 Certified Reinforced Nylon
6 D-6NS SERIES D-6 D-62 NS 2 - DISCHARGE FLOW RATE Differential Pressure (psi) Flow Rates (CFM) ENLARGED SECTION FROM ABOVE CHART D-6 HF NS AIR DISCHARGE SWITCHING REGION 2 6 Differential Pressure (psi) Flow Rates (CFM)
7 D-6NS SERIES D-6, D-62 HF NS INTAKE FLOW RATES -1 Differential Pressure (psi) Flow Rates (CFM) DISCHARGE FLOW RATE (CFM) SIZE 2 DIFFERENTIAL PRESSURE (PSI) ,, 121 1,385 1,53 INTAKE FLOW RATE (CFM) SIZE DIFFERENTIAL PRESSURE (PSI) , ,49-1,435-1,32-1,25-1, ,9-2,79-2,52-2,28-1,96-1,585-1,25-4,61-4,45-4,35-3,58-3,1-2,59-1,85
8 D-6NS SERIES D-6 NS AIR RELEASE FLOW RATE 25 2 Differential Pressure (psi) Flow Rates (CFM) AIR RELEASE FLOW RATE FLOW RATE (CFM) DIFFERENTIAL PRESSURE (psi)
9 D-6NS SERIES D-62 NS AIR RELEASE FLOW RATE Differential Pressure (psi) Flow Rates (CFM) AIR RELEASE FLOW RATE FLOW RATE (CFM) DIFFERENTIAL PRESSURE (psi)
10 D-6NS SERIES 1. When water, rapidly filling the pipe line, pushes the air out through the air valve, a differential air pressure is created across the valve orifice. 2. When this differential pressure reaches a prefixed level (usually it will be prefixed at.72 psi) the non-slam disc will close. 3. Air will continue to come out through the small orifice disc - until all the air will be exhausted and water will reach the air & vacuum float. This double stage air & vacuum air discharge prevents the slam effect and therefore suppresses water hammer. 4. When water reaches the air & vacuum float, it lifts it up, closing the air & vacuum orifice and completing the air & vacuum cycle. 5. The non-slam disc will come back to its normal open position. 6. When water is drained out of the pipe line, the resulting pressure drop lets the air & vacuum float fall down, opening the orifice fully for intake of high volume of air into the line. NETAFIM USA 547 E. HOME AVE. FRESNO, CA CS D-6NS AV 2/13
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