The utility model provides a runner is installed to the inboard, outside fixed mounting has the dog, on the runner then fixed mounting have the clamp splice subassembly, and the clamp splice subassembly rotates when being close to the dog and can't pass through hose clamping deformation to the fluid that pollution -free double - circuit pipe valve is equipped with two hoses in the valve casing, and the casing is located two hoses. This pipe valve can be so that the hose produces deformation and seals the internal control according to the turned position of runner, and it is through exerting pressure and closed pipeline from the pipeline outside, and fluid direct contact that it can not be inside with the pipeline can not lead to the fact the pollution by the convection cell, the cleanliness of effectively guaranteeing the water sample with improve the sampling accuracy, simultaneously, this pipe valve is mainly by the runner of two hoses inside and outside both sides and opening, closing of dog realization pipeline, and its simple structure can effectively reduce equipment volume and weight for arranging of equipment is more convenient and easy, then can effectively improve unmanned ship's operational capability and application range in the unmanned ship field.