O-shaped ball valve group

Abstract

The invention relates to an O-shaped ball valve group. The O-shaped ball valve group comprises a plurality of ball valves sharing one valve body, the valve body is provided with installation holes corresponding to all ball valves, first channel sections and second channel sections, and each first channel section and the corresponding second channel section are coaxial. Each ball valve comprises a valve seat assembly, an O-shaped ball core, a valve rod, a ball valve sealing mechanism and a backlash compensation gear, wherein each valve seat assembly is installed in the corresponding installation hole and provided with a containing cavity, a punching hole, a fourth channel section and a fifth channel section, each fourth channel section and the corresponding first channel section are through, and each fifth channel section and the corresponding second channel section are through; each O-shaped ball core is installed in the corresponding containing cavity and provided with a third channel section, and each third channel section is selectively communicated with the other corresponding channel sections along with rotation of the corresponding O-shaped ball core so that a through flowing channel penetrating the corresponding ball valve is formed; each backlash compensation gear is used for compensation of a backlash between the corresponding O-shaped ball core and the corresponding valve seat assembly; and each valve seat assembly comprises an inner valve seat and an outer valve seat which are oppositely arranged on the two sides of the corresponding O-shaped ball core in the axial direction of the corresponding installation hole, and the inner valve seats and the outer valve seats are each provided with a cavity; and each containing cavity is formed by combining the cavity of the corresponding inner valve seat and the cavity of the corresponding outer valve seat, and each punching hole is formed in the corresponding outer valve seat.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an O-type ball valve group. Background technique [0002] At present, valve groups including two-valve group, three-valve group, four-valve group and five-valve group all use needle-type globe valves or ball-type globe valves. The valve group composed of such needle type or ball valve stop valve has the following problems: [0003] 1. Since the existing valve group uses a needle valve core or a ball valve core, the inlet and outlet channels of the valve are not in the same axis, and the axis of the inlet channel is lower and not parallel to the axis of the outlet channel. Therefore, it has a certain influence on the direction of fluid flow. Strict import and export direction restrictions. like figure 1 As shown, the valve inlet and outlet channel 1, the inlet in the valve body is lower than the outlet, which is called "low in and high out" in practical applications. In this way...

AI Technical Summary

Problems solved by technology

[0003] 1. Since the existing valve group uses a needle valve core or a ball valve core, the inlet and outlet channels of the valve are not in the same axis, and the axis of the inlet channel is lower and not parallel to the axis of the outlet channel. Therefore, it has a certain influence on the direction of fluid flow. Strict import and export direction restrictions

like figure 1 As shown, the valve inlet and outlet channel 1, the inlet in the valve body is lower than the outlet, which is called "low in and high out" in practical applications. In this way, once the direction of the inlet and outlet of the valve is reversed, it is easy to leak from the valve stem, and Its restriction on the direction of fluid flow prevents such a valve group from being applied to applications that require bidirectional fluid flow

In addition, the flow direction of this valve fluid changes many times inside the valve. When the medium has granular substances, it will accelerate the wear between the valve core and the valve seat and cause internal leakage. When it encounters viscous and easy-to-crystallize media, it is prone to blockage.

And because the flow channel in the valve body is very complicated, the processing of the valve body is complex, difficult and costly

[0004] 2. The valve stem rotates through the thread, so that the valve is fully open to fully closed. It needs to be adjusted by multi-turn handle, and the switching speed is slow.

[0005] 3. Needle globe valve or ball globe valve, the valve position can only be seen from the unscrewed length of the bonnet. Sometimes it is not easy to identify when the valve is only opened a little, and when the valve is closed, it is worried that the valve will not close. If it is in place, tighten the handle forcefully, causing excessive pressure between the valve core and seat, and damaging the sealing surface or sealing line.

[0006] 4. The valve core and valve seat seals are hard seals, which are prone to wear after a period of time on and off, which will cause internal leakage of the valve, and because the valve seat and valve body are integrated, so once the sealing surface of the valve seat is worn, it will The valve body must be disassembled and offline for overall maintenance or scrapped, most of which are scrapped in practical applications

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