Champagne tower-type multi-stage throttle control valve

A champagne tower-type multi-stage throttle control valve, comprising a valve body and a valve cover covering the valve body, wherein the valve cover and an inner cavity of the valve body together enclose a valve cavity for arranging a throttle sleeve and a valve core;

• a fluid inlet and a fluid outlet penetrate through the valve cavity, wherein the fluid inlet and the fluid outlet communicate with an external environment;
• the valve core is inserted into a sleeve cavity of the throttle sleeve, such that, after a medium enters through the fluid inlet, the medium flows to the fluid outlet through a fluid passage formed between the throttle sleeve and the valve core;
• the sleeve cavity of the throttle sleeve is shaped as a stepped hole with two or more layers;
• the valve core is shaped as a stepped shaft with two or more layers, wherein the stepped shaft is coaxial with the throttle sleeve;
• a number of shaft shoulders of the valve core is smaller than or equal to a number of hole shoulders of the sleeve cavity of the throttle sleeve, such that each set of shaft shoulders of the valve core in an axial direction can forms a sealing surface fit with corresponding hole shoulders of the throttle sleeve;
• a flow channel groove is axially or obliquely formed on each of the hole shoulders of the throttle sleeve and the shaft shoulders of the valve core, and a flow channel groove on the hole shoulder and a flow channel groove on the shaft shoulder are spaced away from each other;
• and when the valve core produces an axial displacement action relative to the throttle sleeve until a sealing surface is exposed, the sealing surface formed by the hole shoulders of the throttle sleeve and the shaft shoulders of the valve core communicates with the flow channel grooves to form the fluid passage, wherein the valve core is shaped as a multi-layer stepped shaft and the sleeve cavity of the throttle sleeve is shaped as a stepped hole with a corresponding number of layers matching the valve core, such that the valve core and the throttle sleeve form a coaxial sleeve-connected sealing fit, and wherein an outer wall of the throttle sleeve has a conical surface structure with a cross-sectional area increased from top to bottom;
• a valve seat is provided at a top end of the throttle sleeve, and a bottom end surface of the valve seat forms a sealing fit with a top end surface of the throttle sleeve;
• a valve stem vertically penetrates through the valve cover, then enters into a stepped hole cavity of the throttle sleeve through a coaxial hole at the valve seat, and forms a coaxial fixed fit with the valve core;
• a fluid hole radially penetrates through the valve seat the fluid inlet is located at a side of the valve body, and the fluid outlet is located at a bottom end of the valve body;
• and a medium enters the fluid passage through the fluid hole.