High and low pressure shut off device. The wedge disables the low pressure sensing mechanism until the internal pressure of the valve is above the low pressure set point. The high pressure set point is always active. Once the wedge is removed, the low pressure set point is active. The axial pin force creates friction in the spool mechanism that is proportional to the system flowing pressure. At the low pressure set point, the spring force shifts the spool to line up escape holes for the pin and the valve closes.