Straight-through rotary valve structure

A straight-through rotary valve structure comprising:

• a case formed with a conic receiving space, a first extension section being disposed at a tip of the receiving space in communication with an exterior of the case, the receiving space having an opening on a bottom of the receiving space, a second extension section being disposed on the case beside the first extension section;
• a rotary valve block, which is a conic body, a pivot shaft being disposed at a center of a bottom section of the rotary valve block, the rotary valve block being formed with a first hole and a second hole positioned beside the pivot shaft, via a first flow way, the first hole communicating with a third hole formed at a tip of the rotary valve block in communication with the first extension section, via a second flow way, the second hole communicating with a fourth hole formed on a conic face of the rotary valve block;
• and
• an outer cover secured to the case to block the opening of the receiving space, the outer cover being formed with a central shaft hole passing through the outer cover, the pivot shaft passing through the shaft hole and extending outward, the outer cover being further formed with a first perforation and a second perforation beside the shaft hole corresponding to the first and second holes respectively, at least one of an inner side of the first extension section and the shaft hole of the outer cover being provided with a bearing seat for receiving a bearing therein, being connected with at least one of the tip of the rotary valve block and the pivot shaft of the rotary valve block.