The stormwater check valve is an important part of a system that prevents backflow of rainwater into sewers. Its purpose is to control stormwater and protect the environment from pollution and the risks of tidal flooding. It is typically installed at an outfall of a stormwater pipe. It may also be positioned within a house or building. Its design depends on the type of system and the nature of the flow. Its performance is dependent on the pressure differential between the water and the pressure of the drain pipe. The type of check valve that is installed depends on the nature of the system and the flow rate.
Stormwater check valves can be manufactured in a variety of designs. They can be made of metal, durable plastic, or other materials. They may include one or more channels on the interior of the cap. The channels may be recessed or fully enclosed within the cap material. They are designed to be free of obstructions when tightly engaged. They can also have one or more openings or voids that allow air to escape beneath the cap.
In order to function properly, the stormwater check valve must be inspected regularly. Its interior should be cleaned of any debris that may have accumulated therein. It should also be cleaned of any mud that has been deposited therein. It should be maintained in accordance with the manufacturer’s Operation and Maintenance Manual.
Oftentimes, the stormwater check valve is accompanied by a filter cartridge. The filter cartridge is designed to remove small quantities of water from the containment structure. The filter cartridge includes a float valve assembly. The float valve assembly allows more water to flow from the drainage space into the outlet when the housing fills with water. The float valve also provides a means for reducing the rate of fluid flow into the drain manifold. The float valve may be manually operated or controlled through electronic technology. Its design minimizes the risk of a fouling of the filter cartridge.
A stormwater check valve should be checked at least monthly to avoid damage or contamination. Its location should be in an easily accessible area. If it is situated in a house or other structure, it should have an access door. Its installation should be performed by a licensed plumbing contractor.
A check valve’s seals and seats can become worn out over time, requiring replacement. This may occur when it is exposed to the elements or when it is used in a high-volume sewer line. The stormwater check valve sealing integrity of the flap gate should also be checked, as should the hinge. Ideally, the hinge should be free of debris. It should be cleaned early in the summer or at least once a year.
The design of a stormwater check valve is based on several factors, including the amount of pressure that is needed to open the valve. The minimum pressure necessary to open the valve is called the cracking pressure. If the cracking pressure is too great, the valve may not close. The maximum pressure that can be achieved is called the maximum permissible pressure.