Ball valve

Abstract

The invention discloses a ball valve comprising a locking part and a positioning boss, wherein the locking part is arranged on a valve rod, and the positioning boss is arranged on the valve body; the extending part of the locking part is matched with the positioning boss so as to limit the full-open position and the full-closed position of the ball valve; the anti-bending section of the locking part is rectangular, and the height-breadth ratio h / b of the rectangle anti-bending section satisfies the condition that h / b is less than 6 and is more than 1; the ball valve has better anti-bending property. Preferably, the positioning boss is provided with a first positioning surface and a second positioning surface, the deflection angle for the locking part to extend between the first positioning surface and the second positioning surface is 180 degrees; when the extending part rotates to the middle position between two positioning surfaces, the ball valve is in the full-open position and the full-closed position; when the extending part rotates to the position on which the side end surface is abutted with the first positioning surface or the position on which the other end surface is abutted with the second positioning surface, the ball valve is in the full-open position and the full-closed position. Thus, the valve rod can rotate within the range of 180 degrees so as to greatly improve the adaptability and the maneuverability of the ball valve.

Description

Technical field [0001] The invention relates to a ball valve, in particular to a ball valve used in a pipeline system. Background technique [0002] In the refrigeration system, the refrigerant delivery pipeline generally needs to be equipped with a ball valve to realize the cut-off or conduction of the refrigerant transmission path. [0003] See figure 1 , This figure is a schematic diagram of the overall structure of the existing ball valve. [0004] During the opening and closing operation of the existing ball valve, the valve stem 14 drives the ball 11 to rotate in the valve body 12. The deflection angle of the ball 11 from the fully open position to the fully closed position is approximately 90°. Therefore, the ball 11 is in the valve body. The angle of rotation within 12 needs to be limited. Such as figure 1 As shown, the existing ball valve uses a positioning pin 13 as a stop component to cooperate with a positioning boss to realize the limit of the switch, wherein the posit...

AI Technical Summary

Problems solved by technology

[0005] During use, the positioning pin is often bent and deformed due to the large operating torque, which affects the control of the opening of the ball valve, and the stability of the ball valve is poor.

For ball valves with this structure, it is usually necessary to increase the cross-sectional dimensions of related components such as positioning pins and valve stems to increase the flexural section modulus of the positioning pins; Larger assembly space required

In particular, for ball valves with larger specifications, the positioning pin and the valve stem are required to have higher machining accuracy to facilitate assembly, and there is a problem of higher manufacturing costs.

[0006] Additionally, if figure 2 and image 3 As shown, when switching between the fully open position and the fully closed position, the valve stem can only rotate 90°, and the operating range is relatively small. Obviously, the existing ball valve still has the problem of poor operability.

Images