Adjustable constant-pressure experimental water supply system

The utility model belongs to the technical field of geo-technical testing and relates to an adjustable constant-pressure experimental water supply system. The system comprises a high-pressure water supply system, a pressure control system, and a decompression constant-pressure system; the pressure control system comprises an expansion tank, a safety valve, a pressure controller and a power box; the expansion tank, the safety valve and the pressure controller are connected to a main pipe in order; the power box supplies power to the pressure controller; a contactor is disposed in the power box and is connected with a water pump and the pressure controller. The decompression constant-pressure system comprises a primary decompression valve, a secondary decompression valve, a primary pressure gauge, a secondary pressure gauge, a check valve, an exhaust valve and a manifold; the primary decompression valve, the primary pressure gauge, the check valve and the exhaust valve are connected to form a primary branch pipe; the secondary decompression valve, the secondary pressure gauge, the check valve and the exhaust valve are connected to form a secondary branch pipe; the primary branch pipe and the secondary branch pipe are connected with the main pipe through a three-way ball valve and are connected with the manifold through a three-way joint; the distribution end of the manifold is provided with a ball valve. The adjustable constant-pressure experimental water supply system allows seepage pressure to be precisely adjusted and is simple in structure, convenient to operate and highly stable, and precision and efficiency of a seepage experiment can be effectively improved.