D-26. Combination Air Valve for Wastewater. Description. Applications. Operation. Main Features

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1 D26.SWG.CAT.ENG0 D-26 Wastewater Combination Air Valve for Wastewater Description The D-26 Combination Air Valve combines an air & vacuum component and an air release component in a single body. The valve is specifically designed to operate with liquids carrying solid particles such as wastewater and effluents. The combination air valve discharges air (gas) during the filling or charging of the system, admits air into the system during drainage and at water column separation and releases accumulated air (gas) from the system while it is operating under pressure. The valve s unique design enables the separation of the liquid from the sealing mechanism and assures optimum working conditions. Applications - Wastewater and water treatment plants. - Wastewater and effluent water transmission lines. Operation The air & vacuum component discharges air at high flow rates during the filling of the system and admits air into the system at high flow rates during its drainage and at water column separation. At any time during system operation, should internal pressure of the system fall below atmospheric pressure, air will enter the system. The smooth discharge of air reduces pressure surges and other destructive phenomena. The intake of air in response to negative pressure protects the system from destructive vacuum conditions and prevents damage caused by water column separation. Air entry is essential to efficiently drain the system. The air release component releases entrapped air in pressurized systems. Without air valves, pockets of accumulated air may cause the following hydraulic disturbances: - Restriction of effective flow due to a reduction of the flow area. In extreme cases this will cause complete flow stoppage. - Obstruction of efficient hydraulic transmission due to air flow disturbances. - Acceleration of cavitation damages. - Increase in pressure transients and surges. - Internal corrosion of pipes, fittings and accessories. - Dangerous high-energy bursts of compressed air. - Inaccuracies in flow metering. As the system fills and is pressurized, the combination wastewater air valve functions in the following stages:. Air (gas) is discharged by the valve 2. When the liquid level reaches the valve s lower portion, the float is lifted, pushing the sealing mechanism to its sealing position. 3. The entrapped air is confined in a pocket between the liquid and the sealing mechanism. The air pressure is equal to the system pressure. 4. Increases in system pressure compress the trapped air in the upper section of the conical chamber. The conical shape assures the height of the air gap. This enables separation of the liquid from the sealing mechanism. 5. Entrapped air (gas), accumulating at peaks and along the system, rises to the top of the valve and displaces the liquid in the valve s body. 6. When the liquid level lowers to a point where the float is no longer buoyant, the float drops, unsealing the air release sealing assembly. The air release orifice opens and allows part of the air that accumulated in the upper portion of the valve to be released to the atmosphere.. Liquid enters the valve. The float rises, pushing the air release sealing assembly to its sealing position. The remaining air gap prevents the wastewater from fouling the mechanism. When internal pressure falls below atmospheric pressure (negative pressure):. The float will drop down, immediately opening the air & vacuum and air release orifices. 2. Air will enter into the system. Main Features - Working pressure range: 2, 4, 6, : bar 3 : bar - Testing pressure:.5 times the max. working pressure. - Maximum working temperature: 60 C. - Maximum intermittent temperature: 0 C. - The unique design of the valve prevents contact between the wastewater and the sealing mechanism by creating an air gap at the top of the valve. These features are achieved by: The conical body shape and the external guide rod/disc arm: designed to maintain the maximum distance between the liquid and the sealing mechanism and still obtain minimum body length. Spring-guided linkage between the float/rod assembly and the sealing mechanism: allows free movement of the float and rod. Vibrations and movement of the float due to turbulence will not unseal the sealing mechanism. Funnel-shaped lower body: designed to ensure that residue wastewater matter will fall back into the system and be carried away by the main pipe. - All inner metal parts made of stainless steel. - Discharge outlet enables connection of a vent pipe. - The ball valve can be opened to release trapped pressure and drain the valve body prior to maintenance and for back-flushing during maintenance.

2 Valve Selection - Size availability: Valve manufactured with flanged ends to meet any requested standard. - Optional Covers (for air discharge direction and for add-on components): 2 models - 2-directional cover is standard 3 models - optional -directional and 2-directional cover 4 models - -directional elbow for horizontal discharge can be removed to allow for vertical discharge - Optional Add-on Components (2, 3, 4 sizes only) With a One-way, Out-only attachment, allows for air discharge only, prevents air intake. With a Vacuum Breaker, In-only attachment, allows for air intake only, prevents air discharge. With a Non-Slam discharge-throttling attachment, allows for free air intake, throttles air discharge. - Standard cast ductile (2 reinforced nylon body), also available with a stainless steel body and polyethylene cover. - Valve body coating: fusion bonded epoxy coating in compliance with the standard DIN Other coatings are available upon request. Note - The D-26 air valve is intended for use with raw wastewater. For use with aggressive liquids, please consult with our application engineers or with the marketing dept. - For best suitability, it is recommended to send the fluid chemical properties along with the valve request. - Upon ordering, please specify: model, size, working pressure, thread and flange standard and type of liquid. C B A DIMENSIONS AND WEIGHTS Model Dimensions mm Connection Weight Kg. Orifice Area mm 2 A B C RN ST ST A / V Auto. D-26 2 (50 mm) Threaded " BSP / NPSM Female D-26 2 (50 mm) Flanged BSP / NPSM Female D-26 NS 2 (50 mm) Threaded " BSP / NPSM Male D-26 NS 2 (50 mm) Flanged BSP / NPSM Male directional cover DI ST ST D-26 3 (0 mm) Threaded " BSP / NPSM Female D-26 3 (0 mm) Flanged BSP / NPSM Female D-26 NS 3 (0 mm) Threaded " BSP / NPSM Male D-26 NS 3 (0 mm) Flanged BSP / NPSM Male directional cover D-26 3 (0 mm) Threaded " BSP / NPSM Female D-26 3 (0 mm) Flanged BSP / NPSM Female D-26 NS 3 (0 mm) Threaded " BSP / NPSM Male D-26 NS 3 (0 mm) Flanged BSP / NPSM Male D-26 4 (0 mm) Flanged " Flanged BSP / NPSM Female D-26 NS 4 (0 mm) Flanged Flanged BSP / NPSM Female D-26 6 (50 mm) Flanged Flanged BSP / NPSM Female D-26 NS 6 (50 mm) Flanged Flanged BSP / NPSM Female D-26 (200 mm) Flanged 552 Flanged BSP / NPSM Female D-26 NS (200 mm) Flanged Flanged BSP / NPSM Female

3 NS Non-Slam Add-on Component Data Table for Variable Orifices Nominal Size 2 (50mm) 3 (0mm) Number of orifices Discharge orifice (mm) Total NS area (mm 2 ) NS orifice (mm) Switching point (bar) Flow at 0.4 bar (m 3 /h) orifice Spring loaded 2 orifices normally closed 3 orifices orifice Spring loaded 2 orifices normally closed 3 orifices (0mm) orifice Spring loaded 2 orifices normally closed 3 orifices (50mm) orifice with (200mm) graduated closure D-26 2 Max. recommended design air discharge D-26 NS 2

4 D-26 3 Max. recommended design air discharge D-26 NS 3

5 D-26 4 Max. recommended design air discharge D-26 NS 4

6 D-26 6 Max. recommended design air discharge D-26 NS 6

7 D-26 Max. recommended design air discharge D-26 NS

8 D-26 2 PARTS LIST AND SPECIFICATION No. Part Material. Threaded Plug Polypropylene 2. Cover Stainless Steel Disk Arm Assy. Cast ST ST + EPDM 4. O-ring EPDM 5. Air & Vacuum Seal EPDM 6. Air Release Seal EPDM. Spring Stainless Steel 36. Spray Guard Polypropylene. Body Reinforced Nylon / Stainless Steel 36. Float Polypropylene. Clamp Cast Stainless Steel 2. O-ring BUNA-N 3. Tap Brass / Stainless Steel 4. Base Reinforced Nylon / Stainless Steel 36 D NS Component D-26 NS 2 C C B A

9 D-26 3 PARTS LIST AND SPECIFICATION No. Parts Material. Disk Arm Assembly Cast ST ST + EPDM 2. Cover Ductile Iron / Cast ST ST 3. Orifice Seat ST ST Plug Polypropylene 5. Air & Vacuum Disc Reinforced Nylon/ Cast ST ST 6. Air Release Seal EPDM. Bolt, Nut & Washer ST ST 36. O-ring BUNA-N. Air & Vacuum Seal EPDM. Spray Guard Polypropylene. Spring ST ST Body Cast Steel / ST ST Float Assy. Polypropylene + ST ST Ball Valve Brass, Chrome Coated / ST ST 36 D-26 3 D-26 NS 3 5. NS Component D D-26 NS 3

10 D-26 4 PARTS LIST AND SPECIFICATION No. Part Material. Discharge Elbow PVC 2. Bolt Nut & Washer Stainless Steel Cover Ductile Iron / Stainless Steel O-ring EPDM 5. Guide Rod Assembly Stainless Steel Plug Stainless Steel 36. Air & Vacuum Seal Assy. EPDM + RN + ST. ST Acetal. Air Release Seal EPDM. Domed Nut Stainless Steel 36. Flow Enhancer ABS. Spring Stainless Steel Float Assembly Stainless Steel Ball Valve Stainless Steel Body Ductile Iron / Stainless Steel 36 D NS Component D-26 4 No Elbow C B D-26 NS 4 A

11 2 3 D-26 6 PARTS LIST AND SPECIFICATION No. Part Material. Flange Supports Stainless Steel Bolt and Washers Stainless Steel Discharge Elbow Polyethylene 4. Seal EPDM 5. Cover Ductile Iron / Stainless Steel SAE Bolt, Nut and Washer Stainless Steel 36. O-ring BUNA-N. Guide Rod Assy. Stainless Steel 36. Air Release Seal EPDM. Air & Vacuum Seal Assy. RN / EPDM / Stainless Steel 36. Flow Enhancer ABS 2. Domed Nut Stainless Steel Spring Stainless Steel Body Ductile Iron / Stainless Steel Float Assembly Polycarbonate / Stainless Steel Ball Valve Stainless Steel 36 B C A D-26 NS 6 PARTS LIST AND SPECIFICATION No. Part Material. Flange Supports Stainless Steel Discharge Elbow Polyethylene 3. Domed Nut and Washers Stainless Steel Threaded Rod Stainless Steel Ring Stainless Steel Ring Seal EPDM. Non Slam Disc Stainless Steel 36. Disc Housing Polyethylene. Cover Ductile Iron / Stainless Steel 36. O-ring BUNA-N. Bolt, Nut and Washer Stainless Steel O-ring BUNA-N 3. Guide Rod Assy. Stainless Steel Air & Vacuum Seal Assy. RN / EPDM / Stainless Steel Air Release Seal EPDM 6. Domed Nut Stainless Steel 36. Spring Stainless Steel 36. Body Ductile Iron / Stainless Steel 36. Ball Valve Stainless Steel Float Assembly Polycarbonate / Stainless Steel

12 D-26 NS PARTS LIST AND SPECIFICATION 2 No. Part Material. Flange Supports Stainless Steel SAE Discharge Outlet Elbow Polyethylene 3. Nuts and Washers Stainless Steel SAE Bolt, Nut and Washer Stainless Steel SAE Cover Stainless Steel SAE 36 / Ductile 6. O-Ring BUNA-N. Ball Valve Reinforced Nylon Body Stainless Steel SAE 36 / Ductile Iron. Float Assembly Stainless Steel SAE 36 / Polycarbonate. Ball Valve Reinforced Nylon. Spring Stainless Steel SAE Guide Rod Assy. Stainless Steel SAE Air & Vacuum Seal Assy. RN / EPDM / ST. ST. SAE Air Release Seal EPDM 5. Domed Nut Stainless Steel SAE Spring Stainless Steel SAE 36 B C D-26 NS PARTS LIST AND SPECIFICATION A No. Part Material. Flange Supports Stainless Steel SAE Discharge Outlet Elbow Polyethylene 3. Nuts and Washers Stainless Steel SAE Ring Stainless Steel SAE Ring Seal EPDM 6. Threaded Rod Stainless Steel SAE 304. Non Slam Disc Stainless Steel SAE 36. Disc Housing Polyethylene. Cover Stainless Steel SAE 36 / Ductile. O-Ring BUNA-N. Seal BUNA-N 2. Ball Valve Reinforced Nylon 3. Body Stainless Steel SAE 36 / Ductile Iron 4. Float Assembly Stainless Steel SAE 36 / Polycarbonate 5. Ball Valve Reinforced Nylon 6. Spring Stainless Steel SAE 36. Guide Rod Assy. Stainless Steel SAE 36. Bolt, Nut and Washer Stainless Steel SAE 36. Air & Vacuum Seal Assy. RN / EPDM / ST. ST. SAE Air Release Seal EPDM 2. Domed Nut Stainless Steel SAE Spring Stainless Steel SAE A.R.I. FLOW CONTROL ACCESSORIES Ltd. ari@ari.co.il Tel: A.R.I. FLOW CONTROL ACCESSORIES Ltd. reserves the right to make product changes without prior notice. To insure receiving updated information on parts specifications, please call the export dept. at the A.R.I. factory. A.R.I. FLOW CONTROL ACCESSORIES Ltd. shall not be held liable for any errors. All rights reserved.