Double-layer-cage double-plunger cage throttling valve

The invention relates to a double-layer-cage double-plunger cage throttling valve. The double-layer-cage double-plunger cage throttling valve mainly comprises a base, a double-layer cage, a piston packing box, an outer piston head, an inner piston head, an outer valve stem, an inner valve stem, a piston, a valve stem packing box, an outer gland, an inner gland, a valve body and the like. The base is mounted on a conical surface in a valve body outlet flow direction, multiple rows of orifices are uniformly distributed in a radial direction of the left end of an outer cage, and multiple rows of orifices are uniformly distributed in a radial direction of the right end of the inner cage. The orifices on the outer cage and the orifices of the inner cage are staggered in the radial direction. The double-layer cage is fixed in an annular cavity between the base and the piston packing box, an outer plunger assembly is composed of the outer piston head, the outer valve stem and the piston, and opening of the outer cage is adjusted through the outer piston rod. An inner piston assembly is composed of the inner piston head and the inner valve stem, and the opening of the inner cage is adjusted through the inner piston head. The double-layer-cage double-plunger cage throttling valve is compact in structure, simple to manufacture and convenient to mount, and cost for gas production is lowered effectively.