There is no check valve for toilets

One. Basic concepts.

Flue check valves are generally used in the exhaust flue of range hoods at home, including range hood check valves, plastic telescopic smoke pipes and flue check valves. The check valve is mainly composed of the valve body, rocker, valve cover, etc.

Two. Classify.

1.Range hood check valve.

The range hood check valve is also called the name of air outlet, exhaust outlet and air hood, etc., it is the range hood comes with, the bottom is fixed on the top of the range hood with screws, and the upper part is connected to the plastic telescopic smoke pipe.

2.Plastic retractable smoke pipes.

The caliber of the plastic retractable pipe is also divided into 18cm, 17cm, 16cm and 15cm, and the caliber of your pipe can only be known by measuring it yourself.

3.Flue check valve.

Flue check valve refers to the check valve installed at the flue mouth, the general builder will be equipped with a good when handing over the house, the actual ventilation diameter is 15cm, and the inside is a metal baffle of an eccentric shaft, which is difficult to achieve complete reverse sealing.

4.Dry check valve.

Mainly composed of valve body, rocker, bonnet, valve seat, sealing seat, etc., when working, the gas opens the valve cover under a certain pressure from the air inlet into the check valve, and flows out from the outlet, when the air pressure suddenly decreases, the valve cover is driven by the rocker, and automatically covers the valve seat to play a sealing role, so that the gas will not flow backwards.

Bathroom exhaust: Generally, household exhaust fans are divided into three types: ceiling type, wall-mounted type and window type. Among them, the ceiling exhaust fan has a better appearance and can be installed on the ceiling of the bathroom.

The ventilation fan has a short duct, so it is necessary to purchase a ventilation duct to match the duct when installing. Wall-mounted exhaust fans are small enough to be embedded in the wall, but they are only suitable for installation in smaller bathrooms due to the narrow cross-section of the exhaust vents, which results in weak ventilation. The window exhaust fan is different from the first two, it has a single and double two-way operation, which can not only exhaust the indoor air, but also supplement the outdoor fresh air to the room, therefore, the window exhaust fan has a larger application range and better effect.

Whether a check valve is installed:

1. If there is already a check valve in the exhaust pipe, then there is no need to install it, if not, then it must be installed, otherwise the outside airflow will be poured into the room.

Second, if it is directly discharged to the outdoors, it does not pass through the exhaust pipe of the whole building. It is possible not to install a check valve.

However, it is important to remember that you must install an insect-proof and rodent-proof net.

Answer: Yes. If it is not installed properly, the smell sent to the exhaust pipe will flow back to the bathroom again through the exhaust fan, so that the odor will not dissipate for a long time.

In order to prevent this situation from happening suddenly, the master will install a check valve to block it when decorating to prevent the smell from flowing back, and also to prevent the odor of other people's homes downstairs and upstairs from entering the home through the exhaust port.

First of all, it can only be used to open the exhaust fan door, open and close the exhaust fan valve, the smell in the pipe will run in, if the exhaust fan has been equipped with a check valve, then the bathroom air duct can not be installed check valve, the reason why it is not installed is to take into account that if the blades of the check valve are closed do not die, but will block the exhaust. Generally, if there is a special exhaust pipe in the bathroom, then it is necessary to install a check valve.

The function of the check valve is: open the exhaust fan door, close the exhaust fan, close the valve, and the odor in the pipeline will not run in. If the exhaust fan is already equipped with a check valve, the check valve can not be installed on the original air duct of the bathroom.

The reason why it is not installed is to consider that if the blade of the check valve is closed and does not die, it will block the exhaust, but if the bathroom has a special exhaust pipe, the check valve is needed.

Your question is a bit inexplicable, I don't know if you are asking about water supply and drainage or exhaust fans.

If you want to install a check valve, it is the exhaust fan, and generally the exhaust fan is equipped with such a device, so there is no need to match it.

Your question is a bit inexplicable, I don't know if you are asking about water supply and drainage or exhaust fans.

If you want to install a check valve, it is the exhaust fan, and generally the exhaust fan is equipped with such a tassel, which does not need to be equipped separately.