A stormwater backflow valve is a device that controls water entering and exiting your home. It’s made of a flap and contains small floatation devices on either side that close and open. When water flows back towards the house, the flap closes and sewer gasses are vented out.
Duckbill check valve
The Duckbill check valve was created in response to a community’s need to prevent stormwater backflow. During typical rain events, the storm drain would rise and flood adjacent properties and heavily traveled roads. The city installed a duckbill check valve, which protruded from the retaining wall. But the valve failed when the storm surge surged violently, causing the valve to become damaged and clogged.
A duckbill check valve is an elastomer valve designed to prevent backflow through a pipe. It is made of fire-retardant material that is resistant to rust and corrosion. The design also allows it to be easily incorporated into various devices, including piping systems and sewer systems. In contrast to flap check valves, the duckbill check valve is able to seal around both suspended and trapped solids. Its flexible sleeve also provides maximum flow and minimum pressure drop across the valve.
A duckbill check valve can also prevent salt water infiltration. PROCO Products Inc. of Stockton, California, provides duckbill check valves for backflow prevention. Besides being used for salt water infiltration prevention, it has a long service life of 35-50 years.
Floating ball check valve
Ball check valves are used to prevent backflow in wastewater systems, especially sewage pumps. They have a large, leak-tight seat, which prevents a flow of water backwards through the valve. They are also known for their high flow efficiency and low maintenance. These valves can be installed in either a vertical or horizontal position.
These valves are available in various materials and styles. Typically, they are made from PVC and have low maintenance requirements. These valves can be installed in a collection basin or directly in the ground. They are available in NPT, BSPP and solvent weld connections, and are able to withstand temperatures up to 180 degrees Fahrenheit.
Another type of check valve is the duckbill type, which is made of robust rubber and elastomeric material. It opens at a cracking pressure and recloses at a lower pressure. The stormwater backflow valve valve is a good choice for stormwater applications, as it is highly resistant to organic contamination and can withstand abrasive slurries.
Sluice gate mechanism
A sluice gate mechanism is a mechanical device that controls the flow of stormwater. The mechanism must be robust and able to withstand the loads involved during its operation. The material used for the sluice gate must be able to resist the stresses and deformations that are expected to occur during its lifting and lowering phases. Its design must be robust enough to withstand these loads, but at the same time it must be durable and safe to operate.
The sluice gate mechanism operates under a quasi-static load and hydrostatic water pressure in the reservoir. The inlet to the water tunnel is directly above the sluice gate mechanism, so a reliable blocking of the inlet is critical.