Stop valve with external structure of valve rod

Abstract

The utility model discloses a stop valve with an external valve rod structure, which comprises a valve body, internal threads are arranged at an upper port of the valve body, the valve rod is inserted into a lower port of the valve body, external threads are arranged at the upper end of the valve rod, the upper end of the valve rod is screwed with the upper port of the valve body, and the joint of the upper port of the valve body and the valve rod is sealed by a rubber ring. A sealing conical surface is arranged at the joint of the lower end of the valve rod and the lower port of the valve body, and relates to the technical field of stop valves, the sealing surface of the valve rod is arranged outside a cavity of the valve body, and the action form of lower sealing force is generated by changing a traditional valve rod pressing mode into a valve rod pulling mode, so that the purpose of minimizing the upper head of the valve body, the valve rod, an upper cover nut, a rubber ring and the like is achieved, and the overall cost of the stop valve is saved; the valve body upper head is designed to be smaller than the valve rod sealing face, meanwhile, the valve rod structure is designed into a whole, the valve body lower seal is assembled to the valve body upper head during installation, and the possibility that the valve rod flies out of the valve body upper head is fundamentally eradicated.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves, in particular to a stop valve with an external valve stem. Background Art

[0002] The components of the stop valve currently on the market include: valve body, valve stem, O-ring, check ring, upper cover nut, cross head nut, valve core, fluorine nozzle nut, copper tube. The valve stem is assembled from the top of the valve body into the inner cavity of the valve body, forming a thread pair with the inner thread of the valve body cavity. After the thread is rotated, the valve stem applies pressure to the sealing line under the valve body to form a hard seal, so that the stop valve can achieve the stop function.

[0003] The current stop valve structure has the following three shortcomings: 1. The valve stem is assembled from the top of the valve body into the interior of the valve body cavity, which leads to the risk of the valve stem flying out from the top when the stop valve is working at high pressure, causing safety hazards during production and use; 2. The valve stem thread must be made larger than the lower seal to form a thread pair with the inner thread of the valve body cavity to meet the structural and functional requirements, resulting in the overall valve stem having to be designed to be thick, which is costly and causes material waste; 3. In order to ensure that the valve stem can be smoothly assembled into the valve body cavity, the top of the valve body must be made large enough, and the cost of the upper cover nut, rubber ring, stop ring, etc. is high and causes material waste. Utility Model Content

[0004] The utility model aims to provide a stop valve with an external valve stem structure to solve the problems raised in the above-mentioned background technology.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A stop valve with an external valve stem structure comprises a valve body, an upper port of the valve body is provided with an internal thread, a lower port of the valve body is inserted with a valve stem, an upper end of the valve stem is provided with an external thread, the upper end of the valve stem is screwed to the upper port of the valve body, the connection between the upper port of the valve body and the valve stem is sealed by a rubber ring, and a sealing cone surface is provided at the connection between the lower end of the valve stem and the lower port of the valve body.

[0007] Preferably, a rubber ring groove is provided on the outer side of the upper end of the valve stem, and the rubber ring is arranged in the rubber ring groove.

[0008] Preferably, a rubber ring groove is provided on the inner side of the upper port of the valve body, and the rubber ring is arranged in the rubber ring groove.

[0009] Preferably, a stop ring groove is provided at the top end of the valve stem, and a stop ring is provided in the stop ring groove.

[0010] Preferably, a hexagonal groove is provided on the top of the valve stem for rotating the valve stem, and an upper cover nut is screwed onto the outer side of the upper port of the valve body.

[0011] Preferably, a valve core is arranged inside the fluorine nozzle of the valve body through a threaded pair, and a fluorine nozzle nut is screwed onto the outer side of the fluorine nozzle of the valve body.

[0012] Preferably, a No. 1 copper tube is welded to the lower port of the valve body, and a No. 2 copper tube is welded to the right port of the valve body.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] In the utility model, the valve stem sealing surface is placed outside the valve body cavity, and the action form of the lower sealing force is changed from the traditional valve stem pressing innovation to the valve stem pulling, thereby achieving the purpose of minimizing the valve body top, valve stem, upper cover nut, rubber ring, etc., saving the overall cost of the stop valve; and the valve body top is designed to be smaller than the valve stem sealing surface, and the valve stem structure is designed as a whole. During installation, the valve body lower seal is assembled to the valve body top, fundamentally eliminating the possibility of the valve stem flying out of the valve body top. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is an exploded view of the utility model;

[0017] Figure 3 It is a cross-sectional view of the utility model;

[0018] Figure 4 It is a side view of the utility model;

[0019] Figure 5 It is a top view of the utility model;

[0020] Figure 6 The use process of the utility model is shown in FIG. Figure 1 , where (a) is the cut-off state and (b) is the connected state;

[0021] Figure 7 The use process of the utility model is shown in FIG. Figure 2 , where (a) is the cut-off state and (b) is the connected state;

[0022] In the figure: 1. Upper cover nut; 2. Check ring; 3. Rubber ring; 4. Valve body; 5. Valve stem; 6. Valve core; 7. Fluorine nozzle nut; 8. No. 1 copper tube; 9. No. 2 copper tube. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] Example:

[0025] A stop valve with an external valve stem, such as Figure 1-5 As shown, it includes a valve body 4, an upper port of the valve body 4 is provided with an internal thread, a lower port of the valve body 4 is inserted with a valve stem 5, an upper end of the valve stem 5 is provided with an external thread, the upper end of the valve stem 5 is screwed to the upper port of the valve body 4, the connection between the upper port of the valve body 4 and the valve stem 5 is sealed by a rubber ring 3, and a sealing cone surface is provided at the connection between the lower end of the valve stem 5 and the lower port of the valve body 4.

[0026] In a possible implementation, Figure 7 As shown, a rubber ring groove is provided on the outer side of the upper end of the valve stem 5, and the rubber ring 3 is arranged in the rubber ring groove.

[0027] In a possible implementation, Figure 6 As shown, a rubber ring groove is provided on the inner side of the upper port of the valve body 4, and the rubber ring 3 is arranged in the rubber ring groove.

[0028] In a possible implementation manner, a stop ring groove is formed at the top end of the valve stem 5, and a stop ring 2 is provided in the stop ring groove.

[0029] In a possible implementation manner, a hexagonal groove is provided on the top of the valve stem 5 for rotating the valve stem 5 , and an upper cover nut 1 is screwed onto the outer side of the upper port of the valve body 4 .

[0030] In a possible implementation manner, a valve core 6 is disposed inside the fluorine nozzle of the valve body 4 through a threaded pair, and a fluorine nozzle nut 7 is screwed onto the outer side of the fluorine nozzle of the valve body 4 .

[0031] In a possible implementation manner, a No. 1 copper tube 8 is welded to the lower port of the valve body 4 , and a No. 2 copper tube 9 is welded to the right port of the valve body 4 .

[0032] Working principle, see Figure 1-7 , copper tube 8 and copper tube 9 are welded to valve body 4. A rubber ring groove is designed on the inner ring of valve body 4, and rubber ring 3 is installed in the rubber ring groove of valve body 4. Valve stem 5 is designed with external thread, and the inner cavity of valve body 4 is designed with internal thread. Valve stem 5 is installed in valve body 4 from the direction of copper tube 8, and the two cooperate to form a thread pair. An inner hexagon is designed on the upper end of valve stem 5. By twisting valve stem 5, valve stem 5 can move up and down through the action of thread pair. After valve stem 5 is installed in the cavity of valve body 4, the mouth of copper tube 8 is reduced to the required size through spinning process. A backstop groove is designed on the upper end of valve stem 5, and backstop 2 is installed in the backstop groove of valve stem 5. Valve stem 5 moves downward when opening. After backstop 2 contacts with the upper end surface of valve body 4, valve stem 5 is prevented from continuing to move downward, forming the lower limit function of valve stem 5. Turn valve stem 5, and valve stem 5 moves downward under the action of thread pair, that is, the stop valve is opened. The position of valve stem 5 in the open state is as shown in FIG. Figure 1As shown. Rotate the valve stem 5 in the opposite direction, the valve stem 5 moves upward under the action of the thread pair, the sealing cone surface of the valve stem 5 contacts the lower sealing line of the valve body 4, and the tension applied to the valve stem 5 by the thread pair is applied to the lower sealing line of the valve body 4, thereby forming a reliable lower sealing line. The position of the valve stem 5 in the sealed state is shown in Figure 2 As shown. The upper cover nut 1 is designed with internal threads and a sealing line on the end face. The upper head of the valve body 4 is designed with external threads and a sealing end face on the upper end face. The upper cover nut 1 is installed on the upper head of the valve body through a threaded pair, and forms a hard seal to prevent leakage from the upper head of the stop valve. The fluorine nozzle of the valve body 4 is designed with a valve core installation structure, the end face is designed with a sealing cone surface, and the outside is designed with external threads. The valve core 6 is installed inside the fluorine nozzle of the valve body 4 through a threaded pair. The fluorine nozzle nut 7 is designed with an internal thread and a sealing line on the inner end face. The fluorine nozzle nut 7 is installed on the fluorine nozzle of the valve body 4 through a threaded pair, and forms a hard seal to prevent leakage from the fluorine nozzle of the stop valve.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stop valve with an external valve stem structure, characterized in that: The valve body (4) comprises a valve body (4), an upper port of the valve body (4) is provided with an internal thread, a lower port of the valve body (4) is provided with a valve stem (5), an upper end of the valve stem (5) is provided with an external thread, the upper end of the valve stem (5) is screwed to the upper port of the valve body (4), the connection between the upper port of the valve body (4) and the valve stem (5) is sealed by a rubber ring (3), and a sealing cone surface is provided at the connection between the lower end of the valve stem (5) and the lower port of the valve body (4).

2. A stop valve with an external valve stem structure as claimed in claim 1, characterized in that: A rubber ring groove is provided on the outer side of the upper end of the valve stem (5), and the rubber ring (3) is arranged in the rubber ring groove.

3. A stop valve with an external valve stem structure as claimed in claim 1, characterized in that: A rubber ring groove is provided on the inner side of the upper port of the valve body (4), and the rubber ring (3) is arranged in the rubber ring groove.

4. A stop valve with an external valve stem structure as claimed in claim 1, characterized in that: A stop ring groove is formed at the top end of the valve stem (5), and a stop ring (2) is arranged in the stop ring groove.

5. The stop valve with an external valve stem structure according to claim 1, characterized in that: The top of the valve stem (5) is provided with a hexagonal groove for rotating the valve stem (5), and an upper cover nut (1) is screwed onto the outer side of the upper port of the valve body (4).

6. The stop valve with an external valve stem structure according to claim 1, characterized in that: A valve core (6) is arranged inside the fluorine nozzle of the valve body (4) through a threaded pair, and a fluorine nozzle nut (7) is screwed onto the outside of the fluorine nozzle of the valve body (4).

7. The stop valve with an external valve stem structure according to claim 1, characterized in that: A No. 1 copper tube (8) is welded to the lower port of the valve body (4), and a No. 2 copper tube (9) is welded to the right port of the valve body (4).

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