Manual stop valve

Abstract

The utility model discloses a manual stop valve which comprises a valve body, a stop valve element is arranged in the valve body, a valve seat is arranged on the valve body, a screw rod is arranged at the upper end of the stop valve element, a first step part is arranged at the top end of the screw rod, a second step part and a third step part are arranged on the stop valve element, and the second step part and the third step part are arranged on the valve body. A hand wheel is arranged at the top end of the first step part, a first step groove is formed in the valve seat, and a second step groove and a third step groove are formed in the valve body. When the stop valve element is in the stop state, two sets of step sealing structures are formed between the stop valve element and the valve body, the sealing performance of the sealing face is improved, one set of step sealing structure is formed between the valve seat and the screw, the sealing performance of the threaded connection position is improved, and sealing is conducted through the multiple sets of step sealing structures. The sealing performance of the whole manual stop valve is improved, gas medium leakage is prevented, and the sealing performance of the connecting position of the step part is further enhanced through the multiple sets of sealing rings.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a manual stop valve. Background Art

[0002] The stop valve, also called the cut-off valve, is one of the most widely used valves. The stop valve is a tool that relies on the valve stem pressure to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the flow of the medium. It is a forced sealing valve. Some gas valves are stop valves, which are widely used in gas medium pipelines to block the flow of gas medium.

[0003] The sealing surface structure of the existing stop valve is simple, and the sealing performance of the sealing surface needs to be improved. The valve body is opened and closed by manually driving the screw to rotate and drive the valve core to move. After long-term use, the sealing performance of the threaded connection of the stop valve will decrease, thereby affecting the sealing performance of the entire stop valve and posing a risk of gas medium leakage. Summary of the invention

[0004] The purpose of the utility model is to provide a manual stop valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a manual stop valve, comprising a valve body, a stop valve core built in the valve body, a valve seat arranged on the valve body, a screw arranged at the upper end of the stop valve core, a first step portion arranged at the top end of the screw, a second step portion and a third step portion arranged on the stop valve core, a hand wheel arranged at the top end of the first step portion, a first step groove arranged inside the valve seat, and a second step groove and a third step groove arranged inside the valve body.

[0006] Wherein, a screw hole is arranged inside the valve seat, and the screw rod is threadedly connected to the screw hole.

[0007] The first step portion is embedded in the first step groove, the second step portion is embedded in the second step groove, and the third step portion is embedded in the third step groove.

[0008] Wherein, a first sealing ring is arranged on the first step portion.

[0009] Wherein, a second sealing ring is arranged on the second step portion.

[0010] Wherein, a third sealing ring is arranged on the third step portion.

[0011] Wherein, an air passage is arranged inside the valve body.

[0012] Wherein, a first connector is arranged at one end of the valve body, and a second connector is arranged at the other end of the valve body.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When the stop valve core of the utility model is in the stop state, two groups of step sealing structures are formed between the stop valve core and the valve body to improve the sealing performance of the sealing surface, and one group of step sealing structures is formed between the valve seat and the screw to improve the sealing performance of the threaded connection. Sealing is performed by using multiple groups of step sealing structures to improve the sealing performance of the overall manual stop valve and prevent leakage of gaseous media.

[0015] The utility model further strengthens the sealing performance of the step portion connection through multiple sets of sealing rings, thereby further improving the sealing performance of the sealing surface and the sealing performance of the threaded connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a structural schematic diagram of the stop valve core of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the first step groove, the second step groove and the third step groove of the utility model;

[0019] Figure 4 It is a top view of the utility model;

[0020] Figure 5 It is a bottom-view stereogram of the present invention.

[0021] In the figure: 1. valve body; 2. stop valve core; 3. valve seat; 4. screw; 5. first step portion; 6. second step portion; 7. third step portion; 8. hand wheel; 9. first step groove; 10. second step groove; 11. third step groove; 12. air duct; 13. screw hole; 14. first connector; 15. second connector; 16. first sealing ring; 17. second sealing ring; 18. third sealing ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-5The utility model provides a technical solution: a manual stop valve, including a valve body 1, a stop valve core 2 is built in the valve body 1, a valve seat 3 is arranged on the valve body 1, a screw 4 is arranged on the upper end of the stop valve core 2, a first step portion 5 is arranged on the top of the screw 4, a second step portion 6 and a third step portion 7 are arranged on the stop valve core 2, a hand wheel 8 is arranged on the top of the first step portion 5, a first step groove 9 is arranged inside the valve seat 3, and a second step groove 10 and a third step groove 11 are arranged inside the valve body 1.

[0024] Among them, when the stop valve core 2 of the valve body 1 is in the stop state, the air passage 12 of the valve body 1 is closed. At this time, the third step portion 7 of the stop valve core 2 is tightly attached to the third step groove 11 to form a set of step sealing structures, the second step portion 6 is tightly attached to the second step groove 10 to form a set of step sealing structures, and the first step portion 5 is tightly attached to the first step groove 9 to form a set of step sealing structures. When the valve body 1 is closed by the stop valve core 2, two sets of step sealing structures are formed between the stop valve core 2 and the valve body 1, which improves the sealing of the sealing surface, and a set of step sealing structures is formed between the valve seat 3 and the screw 4 to improve the sealing of the threaded connection. Sealing is performed by multiple sets of step sealing structures to improve the sealing of the overall manual stop valve.

[0025] The valve seat 3 is provided with a screw hole 13 inside, and the screw rod 4 is threadedly connected to the screw hole 13. The hand wheel 8 is manually turned to drive the screw rod 4 to rotate, thereby driving the stop valve core 2 to move axially. By rotating the hand wheel 8 forward or reversely, the stop valve core 2 is driven to move up or down relative to the valve body 1. When the stop valve core 2 moves up, the air channel 12 of the valve body 1 is opened, and the gas medium can flow normally through the air channel 12. When the stop valve core 2 moves down, the gas medium can flow normally through the air channel 12. Figure 1 As shown, the air passage 12 of the valve body 1 is closed, preventing the gas medium from flowing.

[0026] Among them, the first step portion 5 is embedded in the first step groove 9, the second step portion 6 is embedded in the second step groove 10, and the third step portion 7 is embedded in the third step groove 11. When the stop valve core 2 of the valve body 1 is in the stop state, the first step portion 5 is in close contact with the first step groove 9, the second step portion 6 is in close contact with the second step groove 10, and the third step portion 7 is in close contact with the third step groove 11.

[0027] Among them, multiple groups of step sealing structures form a labyrinth seal, and the joints bite each other to form a sealing surface, which improves the sealing strength of the sealing surface and effectively prevents leakage of gas media.

[0028] Among them, a first sealing ring 16 is arranged on the first step portion 5, and the first sealing ring 16 is located at the connection between the first step portion 5 and the first step groove 9 to enhance the sealing performance of the connection.

[0029] The second step portion 6 is provided with a second sealing ring 17 , and the second sealing ring 17 is located at the connection between the second step portion 6 and the second step groove 10 to enhance the sealing performance of the connection.

[0030] The third step portion 7 is provided with a third sealing ring 18 , and the third sealing ring 18 is located at the connection between the third step portion 7 and the third step groove 11 , so as to enhance the sealing performance of the connection.

[0031] The first sealing ring 16, the second sealing ring 17 and the third sealing ring 18 further improve the sealing performance of the step sealing structure, thereby improving the sealing performance of the sealing surface and the threaded connection, and improving the sealing performance of the overall manual stop valve.

[0032] The valve body 1 is provided with an air passage 12 inside. When the air passage 12 of the valve body 1 is in an open state, the gas medium can flow normally through the air passage 12. When the air passage 12 of the valve body 1 is in a closed state, the flow of the gas medium is blocked.

[0033] Among them, a first connecting head 14 is provided at one end of the valve body 1, and a second connecting head 15 is provided at the other end of the valve body 1. The valve body 1 is fixedly connected to the gas pipeline through the first connecting head 14 and the second connecting head 15. The connection method is simple, and the valve body 1 is convenient to assemble and disassemble, which is conducive to maintenance.

[0034] Working principle: The integral manual stop valve is fixedly connected to the gas pipeline through the first connector 14 and the second connector 15. By rotating the hand wheel 8 forward or reversely, the stop valve core 2 is driven to move up or down relative to the valve body 1. When the stop valve core 2 moves up, the gas passage 12 of the valve body 1 is opened, and the gas medium can flow normally through the gas passage 12. When the stop valve core 2 moves down, the gas medium can flow normally through the gas passage 12. Figure 1 As shown, the air passage 12 of the valve body 1 is closed to prevent the gas medium from flowing. When the stop valve core 2 of the valve body 1 is in the stop state, the third step portion 7 of the stop valve core 2 is tightly attached to the third step groove 11, and the third sealing ring 18 is located at the connection between the third step portion 7 and the third step groove 11, forming a group of step sealing structures. The second step portion 6 is tightly attached to the second step groove 10, and the second sealing ring 17 is located at the connection between the second step portion 6 and the second step groove 10, forming a group of step sealing structures. The first step portion 5 is tightly attached to the first step groove 9, and the first sealing ring 16 is located at the connection between the first step portion 5 and the first step groove 9, forming a group of step sealing structures. Two groups of step sealing structures are formed between the stop valve core 2 and the valve body 1 to improve the sealing performance of the sealing surface. A group of step sealing structures is formed between the valve seat 3 and the screw 4 to improve the sealing performance of the threaded connection. Sealing is performed by multiple groups of step sealing structures to improve the sealing performance of the overall manual stop valve.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manual stop valve, comprising a valve body (1), characterized in that: The valve body (1) has a stop valve core (2) built in, a valve seat (3) is provided on the valve body (1), a screw (4) is provided at the upper end of the stop valve core (2), a first step portion (5) is provided at the top end of the screw (4), a second step portion (6) and a third step portion (7) are provided on the stop valve core (2), a hand wheel (8) is provided at the top end of the first step portion (5), a first step groove (9) is provided inside the valve seat (3), a second step groove (10) and a third step groove (11) are provided inside the valve body (1), the first step portion (5) is embedded in the first step groove (9), the second step portion (6) is embedded in the second step groove (10), and the third step portion (7) is embedded in the third step groove (11).

2. A manual stop valve according to claim 1, characterized in that: A screw hole (13) is provided inside the valve seat (3), and the screw rod (4) is threadedly connected to the screw hole (13).

3. A manual stop valve according to claim 1, characterized in that: A first sealing ring (16) is provided on the first step portion (5).

4. A manual stop valve according to claim 1, characterized in that: A second sealing ring (17) is provided on the second step portion (6).

5. A manual stop valve according to claim 1, characterized in that: A third sealing ring (18) is provided on the third step portion (7).

6. A manual stop valve according to claim 1, characterized in that: An air passage (12) is provided inside the valve body (1).

7. A manual stop valve according to claim 1, characterized in that: One end of the valve body (1) is provided with a first connector (14), and the other end of the valve body (1) is provided with a second connector (15).

Images