Ball valve structure

Abstract

A ball valve structure, comprising a valve seat (1), wherein the valve seat (1) comprises a first sealing surface (a) and a second sealing surface (b), which are arranged opposite each other, and the valve seat (1) has a first sealing state and a second sealing state; in the first sealing state, the first sealing surface (a) abuts against a valve cover (2), and the second sealing surface (b) abuts against a ball (3) so as to seal a gap between the valve cover (2) and the ball (3); in the second sealing state, the second sealing surface (b) abuts against the valve cover (2), and the first sealing surface (a) abuts against the ball (3) so as to seal the gap between the valve cover (2) and the ball (3); and a pre-designed compression amount of the first sealing surface (a) is less than that of the second sealing surface (b). In the first sealing state of the valve seat (1), when a valve needs to rework due to a large torque or no torque after assembly because certain machining tolerances of a valve body, the valve cover (2) and the ball (3) plus the tolerance of the valve seat (1) exceed a pre-designed compression amount of the valve seat (1), the valve seat (1) is assembled in reverse, and thus leakage caused by an insufficient compression amount can be compensated, thereby preventing parts from being scrapped.

Description

A ball valve structure

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 26, 2023, with application number 202310760034.X and invention name “A ball valve structure”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of oil refining and chemical valves, and in particular to a ball valve structure. Background Art

[0004] PEEK (polyetheretherketone) is widely used as the valve seat of soft-seal floating ball valves. PEEK material has high compressive strength and large elastic modulus. The compression amount when assembled into the soft-seal floating ball valve must be very small, generally ≤0.1mm.

[0005] Currently, the parts that come into contact with the valve seat include: valve body, valve cover, and ball. Each part has a certain processing tolerance. Adding the tolerance of the valve seat itself, the accumulation of all tolerances will exceed the pre-designed compression of the valve seat. Therefore, it is difficult to control the compression during actual assembly in the workshop. Workers often find that the valve torque is too high or there is no torque after assembly and have to rework it, which seriously affects the valve assembly efficiency and qualification rate.

[0006] Summary of the Invention

[0007] Therefore, the technical problem to be solved by this application is that the parts in contact with the valve seat in the existing technology include: valve body, valve cover, and ball. Each part has a certain processing tolerance. Coupled with the tolerance of the valve seat itself, the accumulation of all tolerances will exceed the pre-designed compression of the valve seat. Therefore, it is difficult to control the compression during actual assembly in the workshop. It is often found that the valve torque is large or there is no torque after assembly, and then the workers have to rework it, which seriously affects the valve assembly efficiency and pass rate.

[0008] To this end, the present application provides a ball valve structure, comprising:

[0009] The valve seat comprises a first sealing surface and a second sealing surface arranged opposite to each other, wherein the valve seat has a first sealing state and a second sealing state;

[0010] In the first sealing state, the first sealing surface abuts against the valve cover, and the second sealing surface abuts against the ball, so as to seal the gap between the valve cover and the ball;

[0011] In the second sealing state, the second sealing surface abuts against the valve cover, and the first sealing surface abuts against the ball, so as to seal the gap between the valve cover and the ball;

[0012] Wherein, the pre-designed compression amount of the first sealing surface is smaller than the pre-designed compression amount of the second sealing surface.

[0013] Optionally, a through hole is provided inside the valve seat, the through hole is suitable for being sleeved on the valve cover, and the first sealing surface and the second sealing surface are both chamfered near ends of the through hole.

[0014] Optionally, in the first sealing state or the second sealing state, a deformation space is formed between the chamfer on the first sealing surface or the second sealing surface and the valve cover.

[0015] Optionally, a chamfer angle on the first sealing surface is greater than a chamfer angle on the second sealing surface.

[0016] Optionally, in the first sealing state or the second sealing state, a gap is provided between the valve cover and a side of the valve seat away from the through hole.

[0017] Optionally, the gap width is 0.1-0.2 mm.

[0018] Optionally, the first sealing surface and the second sealing surface are parallel to each other.

[0019] Optionally, a fool-proof portion is provided on a side of the valve seat close to the first sealing surface.

[0020] Optionally, the fool-proof portion is a chamfer provided on one side of the first sealing surface.

[0021] The ball valve structure provided in this application has the following advantages:

[0022] 1. The present application provides a ball valve structure, including a valve seat, which includes a first sealing surface and a second sealing surface arranged opposite to each other, and the valve seat has a first sealing state and a second sealing state; in the first sealing state, the first sealing surface abuts against the valve cover, and the second sealing surface abuts against the ball, so as to seal the gap between the valve cover and the ball; in the second sealing state, the second sealing surface abuts against the valve cover, and the first sealing surface abuts against the ball, so as to seal the gap between the valve cover and the ball; wherein the pre-designed compression amount of the first sealing surface is less than the pre-designed compression amount of the second sealing surface.

[0023] The ball valve structure of this structure is provided with a first sealing surface a and a second sealing surface b on opposite sides of the valve seat, and the pre-designed compression amount L2 of the second sealing surface b is greater than the pre-designed compression amount L1 of the first sealing surface a. In the first sealing state of the valve seat, when the valve body, the valve cover and the ball have certain processing tolerances, plus the tolerance of the valve seat itself, all the tolerances accumulate and will exceed the pre-designed compression amount of the valve seat. As a result, when it is found that the valve torque is large or there is no torque after assembly and the valve seat needs to be reworked, the valve seat is assembled in reverse. Since the pre-designed compression amount L2 of the second sealing surface b is greater than the pre-designed compression amount L1 of the first sealing surface a, the leakage caused by insufficient compression can be compensated, thereby avoiding the scrapping of parts.

[0024] 2. The present application provides a ball valve structure, wherein a through hole is provided inside the valve seat, the through hole is suitable for being sleeved on the valve cover, and the first sealing surface and the second sealing surface are both provided with chamfers near the through hole ends.

[0025] In the ball valve structure of this structure, chamfers are provided on the first sealing surface and the second sealing surface close to the inner ring side to increase the elasticity of the valve seat in the axial direction.

[0026] 3. The present application provides a ball valve structure, in which, in the first sealing state or the second sealing state, a gap is provided between the valve seat away from the through hole and the valve cover.

[0027] In the ball valve structure of this structure, in the first sealing state or the second sealing state, a gap is provided between the valve seat away from the through hole and the valve cover to increase the elasticity of the valve seat in the radial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] FIG1 is a schematic structural view of a ball valve structure provided in an embodiment of the present application;

[0030] FIG2 is an enlarged view of the structure at circle A in FIG1 ;

[0031] FIG3 is a schematic structural view of a valve seat provided in an embodiment of the present application;

[0032] FIG4 is a schematic structural view of another installation method of a valve seat in a ball valve structure provided in an embodiment of the present application;

[0033] Explanation of the accompanying figures: 1-valve seat; 2-valve cover; 3-sphere. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0036] Example

[0037] This embodiment provides a ball valve structure, including a valve seat 1, a valve cover 2 and a ball 3. As shown in Figure 1, an annular groove is provided on the left end face of the valve cover 2, and a through hole is provided inside the valve seat 1 to facilitate the installation of the valve seat 1 inside the annular groove. The ball 3 is placed inside the valve body, and the valve seat 1 is arranged between the valve cover 2 and the ball 3 to seal the gap between the valve cover 2 and the ball 3.

[0038] This embodiment provides a ball valve structure, and the valve seat 1 is made of PEEK (polyetheretherketone). PEEK material has high compressive strength and large elastic modulus. The compression amount when assembled into the soft-seal floating ball valve must be very small, generally ≤0.1mm.

[0039] However, due to the machining tolerances of the valve body, bonnet 2, and ball 3, combined with the tolerances of the valve seat 1 itself, the cumulative tolerances exceed the pre-designed compression of the valve seat 1. This makes it difficult to control the compression during actual assembly in the workshop. Workers often find that the valve torque is too high or even zero after assembly, requiring rework. This seriously affects valve assembly efficiency and pass rates. The scrapping of parts during the rework of the valve seat 1, requiring re-sourcing, significantly slows down the overall order flow.

[0040] In this embodiment, the valve seat 1 includes a first sealing surface a and a second sealing surface b disposed opposite each other. The installation configuration of the valve seat 1 shown in Figures 1 and 2 is in its first sealing state. In this first sealing state, the first sealing surface a abuts the valve cover 2, and the second sealing surface b abuts the ball 3, thereby sealing the gap between the valve cover 2 and the ball 3. Specifically, the second sealing surface b is chamfered near the inner ring. In this first sealing state, the chamfered surface of the second sealing surface b abuts the ball 3.

[0041] As shown in FIG2 and FIG3 , the sealing of the first sealing surface a between the valve seat 1 and the valve cover 2 and the second sealing surface b between the valve seat 1 and the ball 3 is ensured by setting a pre-designed compression amount L1 on the first sealing surface a of the valve seat 1 .

[0042] As shown in Figures 2 and 3, the first sealing surface a and the second sealing surface b are parallel to each other, and the first sealing surface a is also chamfered near the inner ring. As shown in Figure 2, in the first sealing state, a deformation space is formed between the chamfered portion of the first sealing surface a and the wall of the annular groove of the valve cover 2. It can be understood that when the ball 3 presses the valve seat 1 from left to right in Figure 2, this deformation space can increase the elasticity of the valve seat 1 in the axial direction (the axial direction is from left to right in Figure 2).

[0043] As shown in FIG3 , the chamfer angle on the first sealing surface a is greater than the chamfer angle on the second sealing surface b.

[0044] At the same time, a gap is provided between the side of the valve seat 1 facing away from the ball 3 (i.e., above the valve seat 1 in Figure 2) and the wall of the annular groove of the valve cover 2. In this embodiment, the gap width is 0.1-0.2 mm. This gap also provides a deformation space, similar to the deformation space formed between the chamfered portion of the first sealing surface a and the wall of the annular groove of the valve cover 2. When the ball 3 presses the valve seat 1 in the upward direction in Figure 2, this gap increases the elasticity of the valve seat 1 in its radial direction, which is the direction from bottom to top in Figure 2.

[0045] In the first sealing state of the valve seat 1, when the compression amount of the first sealing surface a of the valve seat 1 is insufficient and leakage occurs, the first sealing surface a and the second sealing surface b of the valve seat 1 are switched, as shown in Figure 4. In the second sealing state, the second sealing surface b abuts against the valve cover 2, and the chamfered surface of the first sealing surface a close to the inner ring side abuts against the ball 3 to seal the gap between the valve cover 2 and the ball 3.

[0046] At this point, because the pre-designed compression amount L2 of the second sealing surface b is greater than the pre-designed compression amount L1 of the first sealing surface a, leakage caused by insufficient compression can be compensated, preventing component scrap. Similarly, in the second sealing state, a deformation space is formed between the chamfered portion of the second sealing surface b and the wall of the annular groove of the valve cover 2. It can be understood that when the ball 3 presses the valve seat 1 from left to right in Figure 4, this deformation space can increase the elasticity of the valve seat 1 in the axial direction (the axial direction is from left to right in Figure 4).

[0047] In this embodiment, to prevent misalignment of the first sealing surface a and the second sealing surface b during installation, a foolproof portion is provided on the upper side of the valve seat 1 near the first sealing surface a. In this embodiment, the foolproof portion is provided at a 45-degree angle on the upper side of the first sealing surface a. A rounded corner is also provided on the upper side of the second sealing surface b.

[0048] The ball valve structure provided in this embodiment has a first sealing surface a and a second sealing surface b provided on opposite sides of the valve seat 1, and the pre-designed compression amount L2 of the second sealing surface b is greater than the pre-designed compression amount L1 of the first sealing surface a. In the first sealing state of the valve seat 1, when the valve body, valve cover 2, and ball 3 all have certain processing tolerances, and when the tolerance of the valve seat 1 itself is added, all these tolerances accumulate and exceed the pre-designed compression amount of the valve seat 1. This may result in the valve seat 1 being reassembled after assembly if it is found that the valve has high or no torque and needs to be reworked. Since the pre-designed compression amount L2 of the second sealing surface b is greater than the pre-designed compression amount L1 of the first sealing surface a, leakage caused by insufficient compression can be compensated, thereby avoiding part scrapping. At the same time, chamfers are provided on both the first sealing surface a and the second sealing surface b near the inner ring side, and a gap is provided between the side of the valve seat 1 away from the through hole and the valve cover 2 to increase the elasticity of the valve seat 1 in the axial and radial directions. Therefore, the sealing effect of the valve seat 1 can be improved through the interaction between the first sealing surface a, the second sealing surface b, and the chamfers on both sides.

[0049] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A ball valve structure, characterized in that: include: A valve seat (1) comprises a first sealing surface and a second sealing surface which are arranged opposite to each other, and the valve seat (1) has a first sealing state and a second sealing state; In the first sealing state, the first sealing surface abuts against the valve cover (2), and the second sealing surface abuts against the ball (3), so as to seal the gap between the valve cover (2) and the ball (3); In the second sealing state, the second sealing surface abuts against the valve cover (2), and the first sealing surface abuts against the ball (3), so as to seal the gap between the valve cover (2) and the ball (3); Wherein, the pre-designed compression amount of the first sealing surface is smaller than the pre-designed compression amount of the second sealing surface.

2. The ball valve structure according to claim 1, characterized in that: A through hole is arranged inside the valve seat (1), the through hole is suitable for being sleeved on the valve cover (2), and the first sealing surface and the second sealing surface are both chamfered near the ends of the through hole.

3. The ball valve structure according to claim 2, characterized in that: In the first sealing state or the second sealing state, a deformation space is formed between the chamfer on the first sealing surface or the second sealing surface and the valve cover (2).

4. The ball valve structure according to claim 3, characterized in that: The chamfer angle on the first sealing surface is greater than the chamfer angle on the second sealing surface.

5. The ball valve structure according to claim 2, characterized in that: In the first sealing state or the second sealing state, a gap is provided between the valve seat (1) and the valve cover (2) on the side away from the through hole.

6. The ball valve structure according to claim 4, characterized in that: The gap width is 0.1 mm-0.2 mm.

7. The ball valve structure according to any one of claims 1 to 6, characterized in that: The first sealing surface and the second sealing surface are parallel to each other.

8. The ball valve structure according to claim 7, characterized in that: The valve seat (1) is provided with an anti-fouling portion on one side close to the first sealing surface.

9. The ball valve structure according to claim 8, characterized in that: The fool-proof portion is a chamfer arranged on one side of the first sealing surface.

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