Why can't one of the two holes of the pump be blocked by hand and the other can't breathe?

One of the two holes of the pump is blocked by hand, and the other cannot breathe because of the simple instrument composed of two one-way valves and a cylinder. Check valves can only enter and exit. And because of the atmospheric pressure, when a port is blocked and cannot be inflated, the internal and external atmospheric pressures are different and the internal atmospheric pressure is large.

A pump, like a heart, has an inlet and an outlet. The entrance is not ventilated; If the entrance is blocked, there is no gas in the barrel, and of course there is no gas in the exit.

The principle of the pump is to draw air in through the hole on the side, but the air can't come out through that hole, but through the hole where the balloon is inserted. So there is a valve-like thing in the hole on the side, which will automatically close when pumping air, so if you block the main hole, the hole on the side will not be ventilated.

Pump characteristics:

1, suitable for cycling, basketball, volleyball, football and other ball games and bicycle inflation. It is universal, compact in design and firm in structure.

2. The high-pressure pump can be used for front and rear shock absorbers, and can also be used as a pump for ordinary fans.

3. American and French dual-purpose gas nozzles-use any self-propelled vehicle.

4. Inflatable items such as ball games are applicable.

5. In addition to changing the angle at will, the inflatable hose can also rotate 360 degrees at the joint to facilitate inflation at any angle.

6, valve storage fixed seat-intimate small design, storage is super convenient.