Ball valve capable of preventing valve rod from being blown out

Abstract

The utility model discloses a ball valve capable of preventing a valve rod from being blown out, which comprises a valve body, a valve rod rotationally connected with the valve body and a blow-out prevention ring, a first positioning groove which is concave inwards is arranged on the periphery of the valve rod, a second positioning groove which is concave outwards is correspondingly arranged on the inner wall of the valve body, and the blow-out prevention ring is arranged in the first positioning groove. After the valve is provided with the blow-out prevention ring, even if the ball valve is installed in a pipeline and needs to be maintained on site, the blow-out prevention ring can effectively block the valve rod in the valve body under the condition that the upper cover is detached, the valve rod is prevented from being blocked in the valve body, and the valve rod is prevented from being blown out by the blow-out prevention ring. The risk that the valve rod flies out due to the fact that an upper cover fastening bolt is disassembled during maintenance can be effectively avoided, and the safety of field operators and other facilities can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a ball valve that prevents the valve stem from being blown out. Background Technology

[0002] Chemical plants often require the transport of large quantities of high-pressure fluids (such as liquid chemicals and high-pressure steam). Ball valves play a crucial role in these systems by regulating flow and cutting off fluid flow. In some systems, the pressure inside the pipeline can reach 10-20 MPa, and such high pressure can easily blow out the valve stem during maintenance.

[0003] Most existing ball valve structures are as shown in the attached figure. Figure 1 As shown, the top cover is fastened to the valve body with bolts to prevent the valve stem from flying out. However, when the valve is installed on the pipeline, if maintenance is required, workers need to remove the bolts on the top of the valve to perform internal repairs or replace parts. In this case, the valve stem may be forced open by the pressure inside the pipeline, causing injury to personnel or property, posing a certain safety hazard. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of this utility model is to provide a ball valve that prevents the valve stem from being blown out.

[0005] To achieve the above objectives, the technical solution of this utility model is: a ball valve that prevents the valve stem from being blown out, comprising a valve body, a valve stem rotatably connected to the valve body, and an anti-blowout ring, wherein a first positioning groove recessed inward is provided on the outer periphery of the valve stem, and a second positioning groove recessed outward is correspondingly provided on the inner wall of the valve body, and the anti-blowout ring is disposed between the first positioning groove and the second positioning groove.

[0006] Preferably, the anti-blowout ring has an "L" shaped cross section, which includes a snap-fit ​​portion distributed radially along the valve stem and a limiting portion extending axially from the outer edge of the snap-fit ​​portion along the valve stem. The snap-fit ​​portion cooperates with the first positioning groove, and the limiting portion cooperates with the second positioning groove.

[0007] More preferably, the anti-blowout ring includes multiple ring plates, and the multiple baffle plates are joined end to end to form the anti-blowout ring, which also includes a thrust pad for engaging between the valve stem and the limiting part.

[0008] More preferably, the ring is provided with at least one fixing hole, and the ring is fixedly connected to the valve stem by screws.

[0009] More preferably, the ring plate is provided with 4 or 6 ring plates.

[0010] More preferably, the thrust pad is annular.

[0011] Preferably, further comprising a top flange and an upper cover arranged between the top flange and the valve body, the upper cover being provided with an abutting portion for pushing the valve stem into the valve body, and the top flange and the upper cover being fixedly connected to the valve body by bolts.

[0012] The utility model discloses the advantages are:

[0013] The utility model discloses the valve sets up the back of preventing blowing out ring, even if ball valve has been installed in the pipeline, the scene needs to be maintained, namely under the condition of disassembling upper cover, preventing blowing out ring can effectively block valve stem in the valve body, can effectively avoid the risk of flying out of valve stem caused by disassembling upper cover fastening bolt when maintaining, can effectively guarantee the safety of scene operator and other facilities. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment description, the drawing in the following description is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0015] The utility model will be further described in the following in conjunction with the drawings and embodiments:

[0016] Figure 1 It is the schematic diagram of example;

[0017] Figure 2 It is the schematic diagram of preventing blowing out ring section;

[0018] Figure 3 It is the schematic diagram of preventing blowing out ring plan;

[0019] Figure 4 It is the schematic diagram of preventing blowing out ring installation step 1;

[0020] Figure 5 It is the schematic diagram of preventing blowing out ring installation step 2;

[0021] Figure 6 It is the schematic diagram of preventing blowing out ring installation step 3.

[0022] Wherein: 1, valve body;2, valve stem;3, ball;4, valve seat;5, prevent blowing out ring;51, clamping portion;52, limiting portion;6, first positioning groove;7, second positioning groove;8, thrust pad;9, top flange;10, upper cover. DETAILED DESCRIPTION

[0023] Referring to the drawings Figure 1As shown in the figure, a blowout prevention ball valve includes a valve body 1, a valve stem 2, a ball 3, a valve seat 4, and a blowout prevention ring 5. The valve stem 2 is provided with a first positioning groove 6 concaved inward on the outer periphery thereof. The valve body 1 is provided with a second positioning groove 7 concaved outward on the inner wall thereof. The blowout prevention ring 5 is arranged between the first positioning groove 6 and the second positioning groove 7.

[0024] Referring to the accompanying drawings Figure 2 As shown in the figure, the ring section of the blowout prevention ring 5 is in the shape of "L", which includes a clamping portion 51 distributed radially along the valve stem 2 and a limiting portion 52 extending axially along the valve stem 2 from the outer edge of the clamping portion 51. The clamping portion 51 cooperates with the first positioning groove 6, and the limiting portion 52 cooperates with the second positioning groove 7.

[0025] Referring to the accompanying drawings Figure 3 As shown in the figure, the blowout prevention ring 5 includes four ring pieces, which are connected end to end to form the blowout prevention ring 5. The blowout prevention ring 5 further includes a ring-shaped thrust pad 8 arranged between the valve stem 2 and the limiting portion 52. The thrust pad 8 can keep the clamping portion 51 of the blowout prevention ring 5 in the second positioning groove 7, preventing the blowout prevention ring 5 from coming off.

[0026] At least one fixing hole is arranged on the ring piece, and the ring piece is fixedly connected to the valve stem 2 by a screw, which can further increase the stability of the blowout prevention ring 5.

[0027] The blowout prevention ring 5 further includes a top flange 9 and an upper cover 10 arranged between the top flange 9 and the valve body 1. The upper cover 10 is provided with an abutting portion for abutting the valve stem 2 to the valve body 1. The top flange 9 and the upper cover 10 are fixedly connected to the valve body 1 by a bolt.

[0028] The installation steps of the embodiment are as follows:

[0029] 1. Referring to the accompanying drawings Figure 4 As shown in the figure, the blowout prevention ring 5 is installed from the periphery of the valve stem 2 into the first positioning groove 6 at the bottom of the valve stem 2, and is tightly attached to the valve stem.

[0030] 2. Referring to the accompanying drawings Figure 5 As shown in the figure, the valve stem 2 is slowly inserted from the top of the valve body 4, and the installation of the valve stem 2 to the bottom position is completed.

[0031] 3. Referring to the accompanying drawings Figure 6 As shown in the figure, the blowout prevention ring 5 is moved away to the second positioning groove 7 inside the valve body 4, the thrust pad 8 is put in, and finally the installation of the remaining parts is completed.

[0032] After the blowout prevention ring 5 is arranged, even if the ball valve has been installed in the pipeline, the blowout prevention ring 5 can effectively block the valve stem 2 in the valve body 1 in the case of on-site maintenance or disassembly of the upper cover 10. The risk of the valve stem 2 flying out due to the disassembly of the upper cover 10 fastening bolt during maintenance can be effectively avoided, and the safety of the on-site operators and other facilities can be effectively ensured.

Claims

1. A ball valve preventing blowout of a valve stem, comprising a valve body, a valve stem rotationally connected with the valve body, characterized in that: The valve further comprises a blowout prevention ring, a first positioning groove is concave inwardly on the outer periphery of the valve stem, a second positioning groove is concave outwardly on the inner wall of the valve body, and the blowout prevention ring is arranged between the first positioning groove and the second positioning groove.

2. A ball valve to prevent blowout of the valve stem according to claim 1, characterized in that: The cross section of the blowout prevention ring is in the shape of "L", which comprises a clamping portion distributed radially along the valve stem and a limiting portion extending axially along the valve stem from the outer edge of the clamping portion, the clamping portion is matched with the first positioning groove, and the limiting portion is matched with the second positioning groove.

3. A ball valve to prevent blowout of the valve stem according to claim 2, characterized in that: The blowout prevention ring comprises a plurality of ring pieces which are connected end to end to form the blowout prevention ring, and further comprises a thrust pad arranged between the valve stem and the limiting portion.

4. A ball valve to prevent blowout of the valve stem according to claim 3, characterized in that: At least one fixing hole is arranged on the ring piece, and the ring piece is fixedly connected with the valve stem by a screw.

5. A ball valve to prevent blowout of the valve stem according to claim 3, characterized in that: The ring piece is provided with 4 or 6 pieces.

6. A ball valve to prevent blowout of the valve stem according to claim 3, characterized in that: The thrust pad is in the shape of a ring.

7. A ball valve to prevent blowout of the valve stem according to claim 1, characterized in that: The valve further comprises a top flange and a cover arranged between the top flange and the valve body, an abutting portion for pushing the valve stem into the valve body is arranged on the cover, and the top flange and the cover are fixedly connected with the valve body by a bolt.

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