Valve needle component and flow regulating valve

A valve needle component, comprising:

• a screw, wherein the screw comprises a first rod section, a second rod section and a third rod section which are connected in sequence, an outer diameter of the first rod section is greater than an outer diameter of the second rod section, and the outer diameter of the second rod section is greater than an outer diameter of the third rod section;
• a bearing sleeved on the second rod section;
• a bushing sleeved on the third rod section, wherein the bushing is welded to the third rod section, and two end surfaces of an inner ring of the bearing respectively abut against an end surface of the first rod section and an end surface of the bushing;
• a valve head, wherein the valve head has an assembly cavity, and the bearing is located in the assembly cavity;
• and
• a pressing sleeve, wherein the pressing sleeve is arranged at an end of the valve head away from a sealing end;
• and an end of the pressing sleeve close to the sealing end abuts against the screw assembly to limit the screw assembly through the pressing sleeve;
• wherein the screw, the bearing and the bushing form a screw assembly, and the valve head has the sealing end for blocking a valve port,
• wherein the pressing sleeve has a ring structure;
• and the pressing sleeve is in interference fit with or welded to the valve head.

A valve needle component, comprising:

• a screw, wherein the screw comprises a first rod section, a second rod section and a third rod section which are connected in sequence, an outer diameter of the first rod section is greater than an outer diameter of the second rod section, and the outer diameter of the second rod section is greater than an outer diameter of the third rod section;
• a bearing sleeved on the second rod section;
• a bushing sleeved on the third rod section, wherein the bushing is welded to the third rod section, and two end surfaces of an inner ring of the bearing respectively abut against an end surface of the first rod section and an end surface of the bushing;
• a valve head, wherein the valve head has an assembly cavity, and the bearing is located in the assembly cavity;
• and
• a pressing sleeve, wherein the pressing sleeve is arranged at an end of the valve head away from a sealing end;
• and an end of the pressing sleeve close to the sealing end abuts against the screw assembly to limit the screw assembly through the pressing sleeve;
• wherein the screw, the bearing and the bushing form a screw assembly, and the valve head has the sealing end for blocking a valve port,
• wherein the assembly cavity comprises a first cavity section and a second cavity section;
• and along an extension direction of the valve head, a cross-sectional area of the second cavity section is greater than a cross-sectional area of the first cavity section to form a step surface between the first cavity section and the second cavity section, the pressing sleeve abuts against the step surface, and the step surface faces away from the sealing end.