AVI-PP-2 & PP-3 Simple one-piece design and reinforced rubber construction eliminate mechanical and metal components.
AVI-Duckbill Check Valve is a flexible sleeve design made of quality fabric-reinforced elastomer material for maximum resistance to corrosion and wear caused by continuous operation with abrasive slurries, sludge, or effluent. The flexible sleeve provides maximum flow with a minimum pressure drop across the valve at all times.
FEATURE
Reliable performance- provides 100% shut-off, even where debris is present and in large sizes.
Low cracking pressure, drainage under low head.
Quiet operation.
Non-slamming, no vibration.
Minimal head-loss allows greater flow.
Seals around entrapped solid.
Absolute backflow prevention saves money.
Reduces beach erosion.
Rubber construction and less environmental impact from rust and corrosion.
Low installation cost, just slip it on or flange.
Maintenance costs reduced.
Available in flange style and slip on style;
OPERATION
Upstream pressure in the valve forces the lips or “duckbill” apart to permit flow. As pressure or flow increases, the lips open further, allowing more flow. This feature allows solids to pass unhindered with low pressure loss.
When there is backpressure or reverse flow, the lips squeeze tightly together, preventing backflow. Even with some wear, the “duckbill” check sleeve will still function including sealing around entrapped solids.
STYLE AND MATERIAL
PP-3 Flange Style Duckbill Check Valve
The valve consists of an elastomer ‘duckbill’ with a flanged connection. The back up flange is galvanized carbon steel, with 304 or 316 stainless steel as options. This simple rugged design eliminates the mechanical parts which can wear and jam in conventional check valves. They are available in a variety of elastomers.
PP-2 Slip-on Style Duckbill Check Valve
The valve consists of an elastomer ‘duckbill’ with a slip-on connection. This simple rugged design eliminates the mechanical parts which can wear and jam in conventional check valves.
ELASTOMER SELECTION GUIDE
The “duckbill” fabric-reinforced elastomer material include: Ethylene Propylene, Viton, Buna-N, Hypalon, Neoprene, and Natural Rubber for compatibility with most fluids.
Ethylene Propylene Rubber
Most effective for applications involving potable water, waste or diluted acids.
Buna N
Resistant to kerosene, moderate chemicals, fats, oils, grease and many hydrocarbons.
Natural Rubber
Good abrasion resistance, tensile strength and resiliency. Also suitable for applications with organic acids, alcohols, ketones and most moderate chemicals.
Neoprene
Generally resistant to oil and grease, moderate chemicals, fats, many hydrocarbons and ozone. Resistant to barnacle growth.
