DAV - P Air release & Vacuum Break Valves
12Pages

Air release & Vacuum Break Valves Product Catalogue

The presence of trapped air in a pressurized pipeline can have serious effects on system operation and efficiency. As air pockets accumulates at high points, they reduce the effective cross-section of the pipeline in their location, decreasing the water flow, and increasing energy consumption required to pump the water through. Thus reducing the overall system efficiency. A pipeline with many air pockets may impose enough restriction to stop all flow (“airlocks”). The dislodge and movement of the air pockets may change suddenly the fluid velocity and cause pressure surges and pipeline...

The Types and Functions of Air-Valves: Kinetic Air / Vacuum Valve: large quantities of air from the pipeline when it is filled with water , at low pipeline pressure (“Kinetic” air-release function) Admit large quantities of air into the pipe when it is drained, or when the internal pressure drops below atmospheric pressure due to transient conditions in transient conditions (“Kinetic” anti-vacuum function) AUTOMATIC AIR VALVE AUTOMATIC AIR VALVE Automatic Air Release Valves: small pockets of accumulated air while the pipeline operates under pressure (“Automatic” air-release function)...

Outlet of reservoir, downstream of the check valve Discharge side of pumps, subsequent to a non return valve Discharge side of vertical turbine pumps, subsequent to a non return valve On uniform, long pipe sections: horizontal run, long descents, and long ascents Negative breaks: increase in a downward slope Downstream of a pressure reducing device Both sides of check-valves, isolating valves or any device that may be closed Both sides of canal and bridge crossings

Sizing principles: The volumetric air flow through the air valve is equal to the flow rate of the water filling or emptying the system: For each volume of water entering the pipeline, the same volume of air must me expelled, and similarly, for each volume of water drained from the system, the same volume of air should be admitted into the line. Note: Air is a compressible media, so its density and volume vary with the pressure. The term “volumetric flow” noted above, refers to the volume of air inside the pipeline. It is smaller than the ‘standard’ (atmospheric pressure) air flow when the...

DAV-P-A The valve is designed for an efficient release of entrapped air from the pipeline, while the network is at normal working pressure. Due to the relatively large orifice, compare to other Automatic valves in the market, it can also release the air through initial filling of a small-diameter pipe, or admit air into it while it is drained. Properties: An Automatic air valve, that enables the release of dissolved air that accumulate in the pipeline. The valve will release the air at normal operation pressures of the pipeline. The Float is made of naturally-buoyant material (specific...

Parts list and specifications: Part Material Glass Reinforced Nylon Optional: Brass Glass Reinforced Nylon Foamed Polypropylene Drainage Elbow Dimensions: Valve Performance: Discharge data (free air flow) CFM 10

DAV-P-K This valve has been designed for efficient discharge and intake of air in water transport systems, filtering systems, containers, and other places where confined air could impair the system’s operation. The valve is appropriate for: • Expelling the air at high flow velocity during the initial filling of the system • Introducing large quantities of air when the pipe drains, maintaining atmospheric pressures in the pipe and preventing collapse and cavitation damage to the conduits Properties: Leak-proof sealing at all conditions, including low system pressure. The aerodynamic design...

Parts list and specifications: Foamed Polypropylene Kinetic Seal EPDM Rubber Drainage Elbow Material Glass Reinforced Nylon Optional: Brass Glass Reinforced Nylon Dimensions: Valve Performance: Inflow data (free air flow) 2” CFM 300 Discharge data (free air flow) 1/2” 3/4” 1” , , CFM Inflow data (free air flow) 1/2” 3/4” 1” , , CFM 60 0 Discharge data (free air flow) 2” CFM

DAV-P-KA This valve has been designed for efficient discharge and intake of air in water transport systems, filtering systems, containers, and other places where confined air could impair the system’s operation. The valve is appropriate for: • Expelling the air at high flow velocity during the initial filling of the systems • Introducing large quantities of air when the pipe drains, maintaining atmospheric pressures in the pipe and preventing collapse and cavitation damage to the conduits • Relieving the entrained air from the water, while the network is pressurized Properties: Leak-proof...

Parts list and specifications: Description Material Glass Reinforced Nylon Optional: Brass Glass Reinforced Nylon Foamed Polypropylene Glass Reinforced Nylon Automatic Seal Kinetic Seal O ring Drainage Elbow EPDM Rubber K - Kinetic Nozzle Area Performance: Inflow data (free air flow) 2” CFM 200 Discharge data (free air flow) 1/2” 3/4” 1” , , CFM Inflow data (free air flow) 1/2” 3/4” 1” , , CFM 60 0 Discharge data (free air flow) of the small nozzle 1” 2” , CFM Discharge data (free air flow) 2” CFM

Expertise Expertise Reliability Reliability Italy Spain Hundreds of companies in the industrial, civil engineering, municipal and agricultural sectors around the world have chosen DOROT’s innovative and field-proven technologies. Since its establishment in 1946, DOROT leads the valves market with continued innovation, uncompromising excellence and firm commitment to its customers, consulting and supporting them through all stages of a project and overcoming challenges in R&D, design, implementation, and maintenance.