Quantitative pump truck posture adjustment system with single acting cylinder

The invention relates to a quantitative pump truck posture adjustment system with a single acting cylinder. The first control end of a second right shuttle valve of the system is connected with the load feedback control end of a second right load sensitive proportional valve set, the second control end of the second right shuttle valve is connected with an oil tank, and the oil returning control end is connected with the second control end of a first right shuttle valve. The first control end of the first right shuttle valve is connected with the load feedback control end of a first right load sensitive proportional valve set, and the oil returning control end is connected with the second control end of a second left shuttle valve; the first control end of the second left shuttle valve is connected with the load feedback control end of a second left load sensitive proportional valve set, and the oil returning control end is connected with the second control end of a first left shuttle valve; and the first control end of the first left shuttle valve is connected with the load feedback control end of a first left load sensitive proportional valve set, and the oil returning control end is connected with the control end of a main pressure control valve set for a quantitative pump. Accordingly, in a multi-load acting system, load pressure fed back by the control end of the main pressure control valve set for the quantitative pump is the maximum value obtained after comparison of loads by the shuttle values, wherein the loads correspond to oil and gas suspensions.