Bladder pressure tank, and the use of gas compressibility design, it is in the pipeline system and pipeline fill added a pocket between the pressure tank, pump, while increasing the electrical contacts on the pipeline, electrical contacts The direct indication gauge pressure pipeline system, when the system pressure is below the set minimum pressure, pressure gauge will transmit a signal to the network up water pumps, pipe water supply pump began to work; when the system pressure is greater than the set maximum pressure, electrical pressure gauge will transmit a signal to the network up water pumps, pipe supply pump to stop working. After the pipe network water supply pump to stop working, the system pressure by bladder pressure tank, and to compensate, when the pipeline system pressure drop, bladder tank of gas at constant pressure to the natural expansion of the body of water automatically fill the tank at a gas pressure into the system; when the capsule constant pressure water tank is reduced to a certain extent, by pipeline to the pumping up pump, gas tank to be compressed again. Work and so forth, to realize the pipe network system regulation. Main features: 1, once filled with nitrogen gas, can maintain long-term use. 2, the tank is sealed unit, gas and water are not in contact, to ensure that water is not contaminated by the outside world. 3, covers an area of ??less investment, quick to install, easy to operate management and maintenance. 4, eliminating the need for high water tank inside the building, saving the structure of investment. 5, acting as a buffer tank, can eliminate water hammer effect on the pipe network. 6, automatic control, reliable operation. 7, the expansion and contraction of water conditioning system ── swelling due to temperature fluctuations caused by shrinkage. 8, make a point of pressure in the system constant ── constant pressure. 9, when the system leaks water ── water to the system. 10, a periodic analysis of dissolved water discharge of exhaust gas ── Applications 1, industrial water: the daily water supply capacity from 50 to 1200 tons; 2, domestic water: for 60 to 12 thousand residents of water; 3, central air conditioning 5, the old water supply system (towers, water tanks, etc.) of transformation; frozen water circulation constant pressure and fire water; 4, rural irrigation system and self-built water supply system.