Valve seat assembly, ball valve and assembling method of valve seat assembly

Abstract

The invention discloses a valve seat assembly, a ball valve and an assembling method of the valve seat assembly. The valve seat assembly comprises a fixator, a valve seat and a distracting ring. The ball valve comprises the valve seat assembly, a valve rod and a valve ball. The assembling method comprises the steps that the distracting ring is firstly inserted into the valve seat to form a combination; then the combination is mounted in a first annular groove of the fixator, and the end face of the distracting ring abuts against the groove bottom; and finally the valve seat is pressed into thefirst annular groove, so that the end face of the valve seat abuts against the groove bottom. According to the valve seat assembly of the structure, shaking of the valve seat in the first annular groove can be reduced, the valve seat is effectively prevented from being separated out of the first groove, and sealing between the valve seat and valve ball is guaranteed. Before the valve seat and thefirst annular groove are inserted in place, the width of the valve seat is equivalent to that of the first annular groove, and interference is avoided; the valve seat is pressed into the fixator through a press, the acting force is not too large, and the end, exposed out of the first annular groove, of the valve seat can be effectively prevented from being crushed.

Description

technical field

[0001] The invention relates to the technical field of valves, in particular to a valve seat assembly, a ball valve and an assembly method for the valve seat assembly. Background technique

[0002] In the valve of the prior art, a retainer is provided between the valve seat and the valve body, the seat is provided on the retainer, and a sealing pair is formed between the valve seat and the valve disc. For example, when the valve is a ball valve, a sealing pair is formed between the valve seat and the ball, or when the valve is a globe valve, a sealing pair is formed between the valve seat and the disc.

[0003] Most of the fixing methods between the retainer and the valve seat in the prior art are as disclosed in Chinese patent document CN202790647U in a large-diameter top-mounted fixed ball valve, such as figure 1 As shown, there is an annular groove on the end surface of the retainer body facing the ball, the groove width of the first annular groove is con...

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