THROTTLE VALVE

Disclosed in the invention is a throttle valve, which comprises two sealing elements whose contact surfaces keep in sealing and matching state, the two sealing elements can move relative to the valve. An inlet (111, 211, 311) and an outlet (121, 221, 321) of the valve are provided on the two sealing elements (11, 21, 31, 12, 22, 32), respectively. A semi-conical adjusting chamber (112, 212, 312, 122, 222, 322) is provided on each of the contact surfaces of the two sealing elements. The sharp ends of the adjusting chambers face to each other and communicate with the inlet and the outlet, respectively. When the contact surfaces of the two semi-conical adjusting chambers overlap at least partly, the two adjusting chambers constitute a passage communicating the inlet with the outlet. The throttle valve can realize greatly proportionally and accurately adjusting, is pressure resistant and wearable, and is suitable for use in slurry delivery pipelines and liquid or other fluid delivery pipelines.

PREFERABLE MODE OF CARRYING OUT THE INVENTION The present invention is further explained with reference to the following embodiments.

A throttle valve with reciprocating slide valve structure can be seen inFIGS. 1-4.

The throttle valve comprises an upper valve body11, a lower valve body12, a connecting groove13and a drive device14. An inlet111and an inlet adjusting chamber112are provided on the upper valve body11. An outlet121and an outlet adjusting chamber122are provided on the lower valve body12. A sealed sliding connection is formed by the connecting groove13between the upper valve body11and the lower valve body12, in which fixed connection is formed between the lower valve body12and the connecting groove13while sliding connection is formed between the upper valve body11and the connecting groove13. Sharp ends of the inlet adjusting chamber112and the outlet adjusting chamber122face to each other. They change their shapes exponentially from their thick ends to their thin ends. The drive device14comprises a rack131disposed on the connecting groove13, and a crank141and a gear142disposed on the upper valve body11. The supply line15connected to the inlet111of the upper valve body11is a hose15.

FIG. 2,FIG. 3andFIG. 4show the relative positions of the inlet adjusting chamber and the outlet adjusting chamber when the throttle valve of the present embodiment is half-opened, full-opened and full-closed.

A throttle valve with rotary valve structure can be seen inFIGS. 5-9.

The throttle valve comprises an upper valve body21, a lower valve body22, a connecting ring23and a drive device24. An inlet211and a semi-conical inlet adjusting chamber212curved as an arcuate shape are provided on the upper valve body21. An outlet221and a semi-conical outlet adjusting chamber222curved as an arcuate shape are provided on the lower valve body22. A sealed rotary connection is formed by the connecting ring23between the upper valve body21and the lower valve body22, in which fixed connection is formed between the lower valve body22and the connecting ring23while rotary connection is formed between the upper valve body21and the connecting ring23. Sharp ends of the inlet adjusting chamber212and the outlet adjusting chamber222face to each other. They change their shapes exponentially from their thick ends to their thin ends. The drive device24comprises a rack241and a worm gear242disposed on the connecting ring23, and a worm gear ring213disposed on the upper valve body21. If the pipes connected to the ends of the throttle valve are rigid tubes, a section of delivery tube26can be added. This delivery tube26is connected to the inlet211of the upper valve body21by means of a rotating sealed connector25.

In order to reduce the friction between the upper valve body and the connecting ring, a ball27and corresponding annular ball track are disposed between the upper valve body and the connecting ring.

FIG. 7,FIG. 8andFIG. 9show the relative positions of the inlet adjusting chamber and the outlet adjusting chamber when the throttle valve of the present embodiment is half-opened, full-opened and full-closed.

A throttle valve with plug valve structure can be seen inFIGS. 10-15.

The throttle valve comprises a valve body31, a plug32, a valve cover33and a sealing package34. An inlet311, a valve chamber and an outlet312are disposed on the valve body. A communication hole321is disposed on the plug. All these four parts are assembled in the same way as regular plug valves. The difference lies in that a semi-conical inlet adjusting chamber313which is in communication with the inlet port of the valve body and a semi-conical outlet adjusting chamber322which is continuous from the communication hole of the plug are respectively disposed on the valve body and the plug. The communication hole and the outlet port of the valve body are always in a communication state within the entire operation rotation stroke of the plug.

In order to reduce the rotational angle between full open and full close and maintain the section area of the passage, the communication hole of the plug and the inlet and outlet ports of the valve body communicated with the communication hole are partly disposed to have oval-like cross-sectional shapes. The corresponding semi-conical inlet and outlet adjusting chambers have semi-oval cross-sectional shape.

FIG. 13,FIG. 14andFIG. 15show the relative positions of the inlet adjusting chamber and the outlet adjusting chamber when the throttle valve of the present embodiment is half-opened, full-opened and full-closed.