Hydraulic fracturing crustal stress test device with pressurization and pressure relief control switch

The invention discloses a hydraulic fracturing crustal stress test device with a pressurization and pressure relief control switch. The device comprises a piston assembly, a valve body and a rubber plug, two fluid pipelines are arranged in the valve body and respectively pressurize and depressurize the rubber plug and pressurize a fracturing section, the two fluid pipelines are separated by four seal ring grooves in the valve body; A piston connected with a clamping position in a reducing mode stays at different positions of the valve body and can pressurize and depressurize the two fluid channels respectively, so that liquid charging and pressurizing and liquid stopping and pressure maintaining of the rubber plug are achieved at first. The fracturing section is pressurized; and finally, the pressure of the rubber plug is relieved. 本发明公开了一种带有加压泄压控制开关的水压致裂法地应力测试试验装置，包括活塞组件、阀体、橡胶栓塞，阀体内有两个流体管路，分别对橡胶栓塞加压与泄压、压裂段加压，这两个流体管路由阀体内4道密封圈槽分隔开，与卡位变径连接的活塞在阀体不同位置停留，可以分别对两个流体通道加压、泄压，从而实现先对橡胶栓塞的充液打压，停液保压；再对压裂段加压；最后对橡胶栓塞泄压功能。