Valve clack anti-rotation structure of stop valve

Abstract

According to the technical scheme, the valve clack anti-rotation structure is characterized by comprising a valve rod, a valve clack and a valve clack cover, a connecting groove is formed in the valve clack, one end of the valve rod can be inserted into the connecting groove, the valve clack cover and the connecting groove are coaxial and detachably connected, an anti-rotation piece is arranged on the groove wall of the connecting groove, and the valve clack cover is connected with the anti-rotation piece. An anti-rotation plane capable of being attached to the end face of the anti-rotation piece is arranged on the peripheral wall of the end, stretching into the connecting groove, of the valve rod, and the anti-rotation piece abuts against the anti-rotation plane so that the valve rod cannot rotate relative to the valve clack. The problems that in the prior art, a valve rod and a valve clack are prone to rotating, so that the valve rod is prone to damage, and the valve rod and the valve clack are prone to loosening are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, and more specifically to a valve disc anti-rotation structure of a stop valve. Background Art

[0002] There are various ways to connect the valve stem and the valve disc of the existing stop valve, such as threading the valve stem end to the valve disc, or extending the valve stem end into the valve disc and using a valve disc cover to limit the valve stem end in the valve disc, etc. The above two methods have defects. Under the action of the medium, the valve disc will rotate relative to the valve stem. The first connection method is prone to loosening. The second connection method will aggravate the wear between the valve stem and the valve disc and cause partial fracture of the valve stem. Both connection methods will shorten the service life of the valve. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a valve disc anti-rotation structure which can prevent the valve disc from rotating relative to the valve stem and has a stable connection.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a valve disc anti-rotation structure of a stop valve, comprising a valve stem, a valve disc and a valve disc cover, the valve disc is provided with a connecting groove for inserting one end of the valve stem, the valve disc cover is coaxial with the connecting groove and is detachably connected, an anti-rotation part is provided on the groove wall of the connecting groove, and an anti-rotation plane that can fit with the end face of the anti-rotation part is provided on the circumferential wall of the end of the valve stem extending into the connecting groove, so that the valve stem cannot rotate relative to the valve disc due to the contact between the anti-rotation part and the anti-rotation plane.

[0005] As a further improvement of the present invention, the anti-rotation component includes an insertion portion inserted into the wall of the connecting groove and an anti-rotation portion whose outline size is larger than the outline size of the end face of the insertion portion, and the anti-rotation portion is located in the connecting groove.

[0006] The beneficial effects of the utility model are as follows: the anti-rotation part contacts the anti-rotation plane, so that the valve stem cannot rotate relative to the valve disc. Such a design can ensure that the valve disc cannot rotate relative to the valve stem, thereby ensuring the structural stability of the valve stem and indirectly extending the service life of the valve stem. At the same time, because the valve stem and the valve disc are relatively stationary, the connection stability between the valve stem and the valve disc can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the utility model;

[0008] Figure 2 for Figure 1 Schematic diagram of the middle valve stem when viewed from bottom to top.

[0009] Reference numerals: 1, valve stem; 2, valve disc; 3, valve disc cover; 4, connection groove; 5, anti-rotation member; 51, insertion portion; 52, anti-rotation portion; 6, anti-rotation plane. Detailed implementation mode

[0010] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. The same components are denoted by the same reference numerals.

[0011] Refer to Figure 1 and Figure 2 As shown, a valve disc anti-rotation structure of a globe valve in this embodiment includes a valve stem 1, a valve disc 2 and a valve disc cover 3. A connection groove 4 for inserting one end of the valve stem 1 is provided on the valve disc 2. The valve disc cover 3 is coaxially and threadedly connected to the connection groove 4. The valve stem 1 includes an outer rod body located outside the valve disc 2, a middle rod body that can penetrate the valve disc cover 3, and an end rod body located in the connection groove 4. The outer rod body, the middle rod body and the end rod body are coaxially connected in sequence and the diameters increase gradually step by step;

[0012] Based on the foregoing prior art, an anti-rotation plane 6 is milled on the end rod body, and a threaded hole is opened on the groove wall of the connection groove 4. The anti-rotation member 5 can be selected as a bolt. There are two installation methods for the bolt. The first installation method is to place the bolt in the connection groove 4 and rotate it outward from the connection groove 4 until the nut abuts against the groove wall of the connection groove 4. Then, insert the end of the valve stem 1 into the connection groove 4. The anti-rotation plane 6 and the end face of the nut of the bolt are arranged opposite to each other and the distance between them is small. Finally, sleeved the valve disc cover 3 outside the valve stem 1 and screwed it into the connection groove 4 until the valve disc cover 3 is connected to the connection groove 4 in place; The second installation method is to first insert the end of the valve stem 1 into the connection groove 4 and ensure that the anti-rotation plane 6 is facing the threaded hole on the groove wall of the connection groove 4. Then, sleeved the valve disc cover 3 outside the valve stem 1 and screwed it into the connection groove 4. After the valve disc cover 3 is connected in place, rotate the bolt from outside the connection groove 4 into the connection groove 4 until the end of the bolt abuts against the anti-rotation plane 6;

[0013] Such a design can ensure that the valve disc 2 cannot rotate relative to the valve stem 1, thereby ensuring the structural stability of the valve stem 1, indirectly extending the service life of the valve stem 1. At the same time, because the valve stem 1 and the valve disc 2 are relatively stationary, the connection stability between the valve stem 1 and the valve disc 2 can also be improved;

[0014] Further explanation, the former of the above two installation methods of the anti-rotation member 5 is preferred. In the latter, it is easy to occur that the bolt is screwed in excessively, which generates too much thrust on the anti-rotation plane 6, resulting in local bending and cracking of the valve stem 1. At the same time, it will also occur that the bolt rotates relative to the anti-rotation plane 6, which will cause wear to the anti-rotation plane 6.

[0015] As a specific implementation of the improvement, using bolts for the anti-rotation part 5 has defects in installation efficiency. If the bolt fails to be screwed in place, it will affect the position where the end of the valve stem 1 extends into the connection groove 4, resulting in the situation where the valve stem 1 and the connection groove 4 are not coaxial and affecting the smoothness of the connection between the valve flap cover 3 and the connection groove 4. To solve the above problems, referring to Figure 1 as shown, the anti-rotation part 5 uses a pin shaft. The hole on the groove wall of the connection groove 4 is a through hole. The anti-rotation part 5 includes an insertion part 51 with a diameter adapted to the through hole and an anti-rotation part 52 with an outline size larger than the inner diameter of the through hole. The insertion part 51 and the anti-rotation part 52 are coaxially arranged. The cross-section of the anti-rotation part 5 is in a T shape. During the installation process, the anti-rotation part 5 is inserted from the inside of the connection groove 4 to the outside of the connection groove 4. Then, the end of the valve stem 1 is inserted into the connection groove 4 and the anti-rotation plane 6 faces the anti-rotation part 52. Next, the valve flap cover 3 is sleeved outside the valve stem 1 and moved to the notch of the connection groove 4. The movement of the valve flap cover 3 drives the valve stem 1 to move horizontally relative to the valve flap 2 so that the valve flap cover 3 and the connection groove 4 are coaxial. At the same time, the anti-rotation plane 6 touches the anti-rotation part 52 and will push the whole anti-rotation part 5 to move in place along the axial direction of the through hole. Finally, the valve flap cover 3 is rotated to make the valve flap cover 3 fixedly connected to the connection groove 4. The anti-rotation plane 6 always fits with the anti-rotation part 52 to ensure that the valve stem 1 cannot rotate relative to the valve flap 2. Such a design can simplify the assembly operation of the anti-rotation part 5 and improve the smoothness of the installation of each component compared with the design of using threads for the anti-rotation part 5.

[0016] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. An anti-rotation structure for the valve disc of a globe valve, comprising a valve stem (1), a valve disc (2) and a valve disc cover (3). A connecting groove (4) for inserting one end of the valve stem (1) is formed on the valve disc (2). The valve disc cover (3) is coaxial with the connecting groove (4) and is detachably connected. It is characterized in that: An anti-rotation member (5) is provided on the groove wall of the connection groove (4). An anti-rotation plane (6) that can fit against the end face of the anti-rotation member (5) is provided on the peripheral wall of the end of the valve stem (1) extending into the connection groove (4). The valve stem (1) is prevented from rotating relative to the valve flap (2) by the abutment of the anti-rotation member (5) and the anti-rotation plane (6).

2. The anti-rotation structure of the valve flap of a globe valve according to claim 1, characterized in that: The anti-rotation member (5) includes an insertion portion (51) inserted into the groove wall of the connection groove (4) and an anti-rotation portion (52) whose contour dimension is larger than the contour dimension of the end face of the insertion portion (51). The anti-rotation portion (52) is located within the connection groove (4).

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