Valve seat assembly, ball valve and assembling method of valve seat assembly
A technology for valve seats and components, applied to valve devices, engine components, cocks including cut-off devices, etc., can solve problems such as valve sealing failure, valve seat falling off, and valve seat being easily crushed
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Embodiment 1
[0048] This embodiment provides a valve seat assembly, such as Figure 2 to Figure 8 As shown, it includes a retainer 1, a valve seat 2 and an expansion ring 3.
[0049] Among them, such as figure 2 , Figure 5 to Figure 8 As shown, the axial end surface of the fixture 1 is provided with a first annular groove 11 sunken inward, and the first annular groove 11 includes a flared section 111 and a small-diameter end fixed to the flared section 111 along its axial direction. The straight section 112 on the top; the longitudinal section shape of the flaring section 111 is a dovetail shape, the fixer is circular, and the fixer is provided with a boss on the side away from the first annular groove in its axial direction, through which the boss will The retainer is fixed on the inner wall of the valve body; the longitudinal section of the expansion ring 3 is dovetail-shaped, the flared section 111 of the first annular groove 11 corresponds to the expansion ring 3, and the straight ...
Embodiment 2
[0063] This embodiment provides a ball valve, such as Figure 9 As shown, it includes the valve seat assembly, valve stem and valve ball 4 in Embodiment 1.
[0064] Wherein, the valve stem is fixed on the valve ball 4, and the rotation of the valve stem drives the rotation of the valve ball 4 to realize the closing or opening of the ball valve. When the ball valve is closed, the sealing surface of the valve seat assembly is in close contact with the outer wall of the valve ball 4 to form a sealing pair to block the medium circulating in the valve cavity; when the valve is opened, the sealing surface of the valve seat assembly and the outer wall of the valve ball 4 The wall surface is separated to realize the opening of the ball valve, and the medium can circulate in the valve cavity.
[0065] In the ball valve with this structure, the valve seat 2 will not fall off from the first annular groove 11 of the retainer 1, and the valve has reliable sealing and long service life.
Embodiment 3
[0067] This embodiment provides an assembly method of a valve seat assembly, such as Figure 5 to Figure 8 As shown, it includes the following steps: first insert the part of the expansion ring 3 facing the sealing surface of the valve seat 2 into the notch of the second annular groove 211 of the valve seat 2 to form a combination; then insert the valve seat 2 The whole combination with the expansion ring 3 is first installed in the first annular groove 11 of the holder 1, so that the end surface of the expansion ring 3 facing away from the sealing surface of the valve seat 2 abuts against the groove of the first annular groove 11 On the bottom, the mounting end 21 of the valve seat 2 partially extends into the first annular groove 11; then the valve seat 2 is pressed into the first annular groove 11 from the notch of the first annular groove 11 toward the bottom of the first annular groove 11. In an annular groove 11, the second annular groove 211 of the valve seat 2 is gradu...
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