Fluid valve and a single shaft-sealing module thereof

A fluid valve comprising a valve body, a shaft, and a valve disc, the valve body having a first hollow space to accommodate the shaft and a second hollow space to accommodate the valve disc, the second hollow space being located below the first hollow space and in communication with the first hollow space, the shaft vertically penetrating the valve disc to drive the valve disc to rotate, wherein the fluid valve further comprises:

• a single shaft-sealing module entirely disposed inside the first hollow space to surround the shaft, comprising:
• a carrier being a first columnar body formed with a third hollow space between an inner wall of the first columnar body, one opening at a topmost end of the first columnar body and one opening at a bottommost end of the first columnar body, the inner wall of the first columnar body being formed with a first annular protruding portion at the bottommost end of the first columnar body, the carrier being detachable with respect to the valve body and entirely disposed inside the first hollow space to surround the shaft;
• a bushing being a second columnar body formed with a second annular protruding portion at a topmost end of an external side surface of the second columnar body, disposed inside the third hollow space of the carrier at a bottom with the second annular protruding portion being seated on the first annular protruding portion, a bottommost end of the second columnar body extending beyond the bottommost end of the first columnar body of the carrier;
• a plurality of first annular shaft seal rings being non-metal and seated on the topmost end of the second columnar body of the bushing to seal the shaft;
• a first annular shaft ring being metallic and seated on the plurality of first annular shaft seal rings;
• a first annular wave spring being metallic and seated on the first annular shaft ring;
• a second annular shaft ring being metallic and seated on the first annular wave spring;
• and
• a plurality of second annular shaft seal rings being non-metal and seated on the second annular shaft ring;
• wherein the first hollow space is columnar and gradually narrowed from a topmost end of the first hollow space;
• the topmost end of the first columnar body of the carrier is beneath the topmost end of the first hollow space;
• the first annular wave spring is formed with a continuously wave-shaped contour and a plurality of convex portions and a plurality of concave portions on a same plane in an offset manner, the convex portions and the concave portions have a same number in quantity, and the convex portions contact a bottommost surface of the second annular shaft ring while the concave portions contact a topmost surface of the first annular shaft ring;
• all of the bushing, the plurality of first annular shaft seal rings, the first annular shaft ring, the first annular wave spring, the second annular shaft ring, and the plurality of second annular shaft seal rings together surround a space to accommodate the shaft;
• at least the plurality of first annular shaft seal rings and the plurality of second annular shaft seal rings provide sealing between the shaft and the inner wall of the first columnar body of the carrier;
• and a lateral loading on a topmost end of the plurality of first annular shaft seal rings and a lateral loading on a bottommost end of the plurality of second annular shaft seal rings are substantially equal.