Why should we pump water into a pump when the country uses a pump to pump it?
This is the water diversion, after the discharge of air, the pump started, under the influence of atmospheric pressure in order to absorb water.
Because it is not a self-priming pump, so add water, otherwise there is no pressure can not afford
Because the leather cushion there is not completely sealed the water pump wall, there is a small gap in the contact, so that the piston up and down the air connection, air pressure is equal, can not pump water.And then add water to the gap closed, such upward pull the piston to make the piston below the space increases, but the air and can not go to fill the air pressure decreases, less than atmospheric pressure, only through inhalation of water to supplement water, which is forced by atmospheric pressure wells the water through the pipe and then rise to the pump. So it can be pumped up.
