1700 Sewer Vent Check Valve
The 1700 Series sewer valve is based on a maritime design: Model 1700 Inverted Vent Check. We have made modifications to allow for the harsh environment of sewer wastewater lines.

Functionality

The Inverted Vent Check Valve design allows for ventilation, while in the open position. If the water level rises above the elevation of the vent valve, our patented float design automatically seals off the vent pipe to prevent water from entering the pipe. After water levels recede, the float returns to its original, open position to once again allow venting.

The body is cast from 356-T6-aluminum alloy, which is lighter and less costly than many other materials. Rather than using the typical anodized protective coating, we use a powder coat epoxy. This epoxy is highly resistant to sewer acids and gases (Hydrogen Sulfide, 20% Sulfuric Acid Aq. Sol., 17% Nitric Acid Aq. Sol., 5% Sodium Hydroxide Aq. Sol.) plus ultraviolet light and oxidation.
Here is a example of a 1700 Sewer Vent Check Valve at a location site.
We use a 316 stainless steel, machined seat to insure a positive seal in the closed position. The float and retaining cap are made of high-density polyethylene, with excellent durability and resistance to chemicals.

The remaining parts of the assembly: guide rod, float support, protective screen, insect screen, and mounting bolts, are manufactured in 316 stainless steel as well. A 1/4” x 1/4” protective mesh screen keeps debris and insects from entering the vent pipe, while maintaining the required open area for municipal use (1.25:1 ratio). This action of blocking vent pipes during flood events relieves the majority of the load that the pump and collection stations endure during flooding.

Test results show that the Wager 1700 Series sewer vent has a leak rate of less than 375 gallons per day at any level. Above 6 feet, the leak rate decreases to less than 25 gallons per day. These results are well below the minimum level for municipal applications (500 GPD).