The invention relates to a multilevel distribution type
constant pressure irrigation system, which comprises a primary
constant pressure water supply system and
constant pressure maintaining type
water flow servo valves for implementing secondary constant pressure
water supply. A
spray irrigation unit requiring high
water pressure is directly connected to the primary constant pressure
water supply system with optimal constant sprinkling
irrigation water pressure, and a microspray
irrigation unit and a
drip irrigation unit which require lower
water pressure pass through the constant pressure maintaining type
water flow servo valve and another constant pressure maintaining type
water flow servo valve respectively prior to being connected to the primary constant pressure water supply system,wherein one constant pressure maintaining type water flow servo valve has water supply pressure constant at optimal microspray
irrigation water supply pressure, and the other constant pressure maintaining type water flow servo valve has water supply pressure constant at optimal
drip irrigation water supply pressure. Difference of water supply pressure of
spray irrigation, microspray irrigation and
drip irrigation is fully utilized, and the multilevel distribution type constant pressure irrigation system has the advantages of
low input, high reliability and convenience in management. The multilevel distribution type constant pressure irrigation system is flexible and convenient, capable of supplying water at constant pressure to the
spray irrigation unit, the microspray irrigation unit andthe drip irrigation unit which have different water supply pressure requirements, not limited by planting structure, planting scale and irrigation
modes, and quite suitable for existing agricultural production and operation
modes with operation in family units.