A tandem conical valve, comprising a valve stem, a valve core and a valve body, the valve stem comprises a first valve stem and a second valve stem, and the valve core comprises a first valve core and a second valve core;
- the valve body has a fluid inlet and a fluid outlet, the valve body is provided with a valve core cavity for accommodating the first valve core and the second valve core, and a valve stem hole for the first valve stem and the second valve stem to pass through, and the valve stem hole penetrates from a surface of the valve body to the valve core cavity;
- the first valve stem and the second valve stem are coaxially provided, with the second valve stem being sleeved in the first valve stem, and the first valve stem and the second valve stem are relatively rotatable;
- the first valve core and the second valve core are coaxially provided in the valve core cavity, an outer wall of the first valve core is matched with an inner wall of the valve core cavity, the first valve core is connected with the first valve stem and driven by the first valve stem to rotate by taking the first valve stem as an axis, an outer wall of the second valve core is matched with an inner wall of the first valve core, the second valve core is connected with the second valve stem and driven by the second valve stem to rotate by taking the second valve stem as an axis, and the first valve core and the second valve core are relatively rotatable;
- the outer walls of the first valve core and the second valve core are conical surfaces, a lower end opening of the first valve core and a lower end opening of the second valve core correspond to lower end openings of the conical surfaces, the first valve core is stacked with the second valve core, the second valve core is smaller than the first valve core, the first valve core is provided with a first flow bore of the first valve core and a second flow bore of the first valve core which penetrate the inner wall and the outer wall of the first valve core, the valve core cavity is provided with a flow bore of the valve core cavity corresponding to the first flow bore of the first valve core and the second flow bore of the first valve core, the second valve core is provided with a flow bore of the second valve core which penetrates the inner wall and the outer wall of the second valve core, and the flow bore of the second valve core corresponds to the second flow bore of the first valve core;
- when the first valve core is rotated to the first flow bore of the first valve core to be communicated with the flow bore of the valve core cavity, a fluid passage between the fluid inlet and the fluid outlet is communicated with the flow bore of the valve core cavity through the lower end opening of the first valve core and the first flow bore of the first valve core to form a primary passage which is cut off by the first valve core when the first valve core is rotated to the first flow bore of the first valve core to be staggered with the flow bore of the valve core cavity;
- when the first valve core is rotated to the second flow bore of the first valve core to be communicated with the flow bore of the valve core cavity and the second valve core is rotated to the flow bore of the second valve core to be communicated with the second flow bore of the first valve core, the fluid passage between the fluid inlet and the fluid outlet is communicated with the flow bore of the valve core cavity through the lower end opening of the second valve core, the flow bore of the second valve core and the second flow bore of the first valve core to form a bypass passage which is cut off by the second valve core or the first valve core when the second valve core is rotated to the flow bore of the second valve core to be staggered with the second flow bore of the first valve core or the first valve core is rotated to the second flow bore of the first valve core to be staggered with the flow bore of the valve core cavity.