1. Traditional water-sealed floor drain
This kind of floor drain problem:
Advantages: cheap, widely used in the products brought by the builders of the rough house.
Disadvantages: poor self-cleaning ability, easy to block, difficult to clean; slow drainage

2. Eccentric block type lower flap floor drain
Use a gasket, fix it with a pin on one side, add a lead block, and use the principle of gravity eccentricity to seal. This structure was initially horizontal, and later evolved into vertical and vertical water seals. When draining water, the gasket is opened under the action of water pressure, and after the drainage is finished, the gasket is closed under the gravity of the lead block.
This kind of floor drain problem:
Advantages: cheap and easy to produce.
Disadvantages:

(1) The gasket is a mechanical structure and is not tightly sealed;

(2) The pin is easily damaged;

(3) The flap is easy to jam and not reset. Basically can not solve the problem of reverberation.

3. Spring floor drain
Use a spring to stretch the gasket at the lower end of the sealing core to seal. When there is no or little water in the floor drain, the gasket is stretched upward by the spring to close the pipe. The water in the floor drain reaches a certain height. When the gravity of the water exceeds the elastic force of the spring, the spring is pressed downward by the water and the gasket opens to automatically drain.
This kind of floor drain problem:
Advantages: the deodorant effect is not bad before the spring fails
Disadvantages:

(1) The spring is made of boron iron, and it is easy to rust after long-term contact with sewage, resulting in weakened elasticity, failure, and short life;

(2) The spring is easy to wrap around the hair and affect the rebound of the gasket;

(3) The gasket is mechanical The structure is not tightly closed. It needs to be cleaned or replaced frequently, otherwise the deodorizing effect will not be achieved at all.