Earth pressure sensor calibrating device's air supply pressure control system

The utility model discloses an earth pressure sensor calibrating device's air supply pressure control system, include and constitute process boost control device jointly by the shut -off valve that admits air, decompression air -vent valve, admit air measurement needle valve and the bypass valve that admits air to and constitute return stroke step -down controlling means jointly by exhaust shut -off valve, backpressure air -vent valve, exhaust measurement needle valve and exhaust by pass valve. Through the utility model discloses the controlled pressure can make the pressure quick approach test point pressure in the overhead tank that is equipped with the earth pressure sensor, can realize again that the high accuracy of a plurality of test point pressure is adjusted and the quick switching, has shortened the settling time of every test point among the calibration process, has improved the work efficiency of calibration, has guaranteed calbiration system accuracy class's requirement simultaneously again, and