Non -negative pressure water supply system

The utility model discloses a non -negative pressure water supply system, including advancing the constant flow compensator of union coupling, two sets of water supply pump packages, bypass pipe, water supply main pipe and main control systems with the running water, the running water is equipped with first teletransmission manometer on advancing the pipe, the inside store water chamber that is provided with of constant flow compensator, the constant flow compensator downside is provided with a plurality of delivery ports, a plurality of delivery port parallel connection an in outlet pipe along the axial, the two sets of water supply pump packages and bypass pipe parallelly connected back with go out water piping connection, the two sets of water supply pump packages are connected with water supply main pipe after parallelly connected with the play water end (W. E. ) of bypass pipe, the last second teletransmission manometer that is equipped with of water supply main pipe, water supply main pipe is connected