The unit of the degassing device that, according to Henry's law: at a certain temperature and pressure were dissolved in water at a certain number of gas, when the temperature increases or pressure decreases, the gas dissolved in water will reduce the principle; in the case of the water temperature does not change by device creates a vacuum, the water free gas and dissolved gas is released, and then through the automatic discharge valve system. Degassed unsaturated water will absorb the gas system to seek gas-water balance. This cycle, so water all gas removal system, constant pressure water device to ensure the stable and secure operation of the system. Balloon membrane continuously outward expansion extrusion chamber, Wuhan constant pressure water device, its volume shrinking to growing pressure tank, constant pressure water equipment wholesale, P2 is reached when the maximum design pressure, pressure switch touch to contact, then the pump automatically stops the pump. The pump automatically stops the operation of the time, due to the gas chamber is extruded nitrogen having an expanded force, constant pressure water equipment prices, squeezing balloon membrane, the water chamber of the water pipe network has a certain pressure to ensure normal supply to the users water.