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Sewer valve check valve
Sewer check valves can effectively prevent the backflow of sewage, the spread of unpleasant odors, and the invasion of mosquitoes, but it is important to follow the correct installation procedures. The core function of a sewer check valve is to prevent the backflow of sewage through its one-way valve design, making it particularly suitable for residents on lower floors or in situations where pipes are shared. Siphonic toilets may cause tap water to flow back when the water supply is cut off, and a check valve can effectively eliminate this risk.
These devices offer multiple layers of protection: they prevent the spread of odors by blocking the movement of gases within the pipes, prevent mosquitoes from entering by physically blocking their path, and also prevent the backflow of air currents, especially in cold winter weather. Transparent models allow for easy observation of the valve’s status, facilitating timely cleaning.
Here are the correct installation methods and precautions for sewer check valves:
**Proper Installation Guidelines:**
- The valve must be installed on a branch pipe; it is not allowed to install it directly on the main pipe.
- Ensure that there is a maintenance access opening, and the valve body should be at least 20 cm away from the outlet to provide sufficient space for maintenance.
- Use a laser level to ensure that the valve is installed vertically, with an error of no more than 2 mm.
- When fixing the valve, use a special adhesive mixed with cement; do not use only silicone sealant.
**Acceptance Standards:**
- During the water testing, the valve should open and close automatically with the flow of water and remain completely closed when there is no water.
- The silicone gasket must fit tightly against the pipe wall without any visible gaps.
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