A kind of open track ball valve

Abstract

An unfurled track ball valve comprises a valve body (1), a valve element (2), a bolt guide pin (3), a valve cover (4), a valve rod (5), a hand wheel (6), a nut (7), a locking nut (8), an elastic gasket (9), an upper cone (10), and a lower cone (11). The valve body (1) is connected with the valve cover (4) through the bolt firmly; the valve element (2) is assembled in a valve cavity (1-2) of the valve body (1); the upper cone (10) and the lower cone (11) are matched with the valve element (2); the valve rod (5) is in reverse thread fit with the upper cone (10) and the lower cone (11); the bolt guide pin (3) is installed on the valve cover (4) and matched with a track groove (10-1); the locking nut (8) is fastened at the top of the thread of the valve rod (5) fit with the upper cone (10). Due to the fact that the valve rod (5) is in reverse thread fit with the upper cone (10) and the lower cone (11) and the track groove (10-1) is arranged, the unfurled track ball valve has the advantages that specific pressure of the sealing surface is distributed uniformly, the sealing surface is free of friction, opening and closing torque is small, stroke of the valve rod is short, and the like.

Description

technical field [0001] The invention relates to a ball valve, in particular to a spread type track ball valve. Background technique [0002] In industrial production, ball valves have been widely used in petroleum, chemical industry, metallurgy, electric power, light industry, pharmaceutical and other fields. The open track ball valve has the advantages of large flow area, small flow resistance, good self-locking vibration resistance, high temperature resistance, high pressure resistance, etc., so it is widely used. However, most of the current open track ball valves still have problems such as poor two-way sealing performance, uneven specific pressure distribution on the sealing surface, easy wear on the sealing surface, long stroke of the valve stem, and short service life. [0003] Chinese patent 201020237465.6 discloses a non-abrasive open-type ball valve. The valve is designed and processed with dovetail grooves on both sides of the ball, and corresponding matching dov...

AI Technical Summary

Problems solved by technology

However, most of the current open track ball valves still have problems such as poor two-way sealing performance, uneven specific pressure distribution on the sealing surface, easy wear on the sealing surface, long stroke of the valve stem, and short service life.

[0003] Chinese patent 201020237465.6 discloses a non-abrasive open-type ball valve. The valve is designed and processed with dovetail grooves on both sides of the ball, and corresponding matching dovetail grooves are processed on the matched valve plate, and a track is designed on the valve stem. structure, this structure results in a long stroke of the valve stem

This structure mainly has the uneven distribution of sealing specific pressure on the sealing surface, and the pressure between the upper and lower end surfaces of the valve body and the ball is different, which makes the wear of the upper and lower seals of the ball different, resulting in unreliable cooperation between the sealing surfaces and affecting the life of the valve.

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