Stop valve with standby valve seat

Abstract

The utility model relates to the technical field of valves, in particular to a stop valve with a standby valve seat, which comprises a valve casing, an upper valve seat is mounted close to the upper portion in the valve casing, a lower valve seat capable of moving up and down is arranged below the upper valve seat, an upper valve core is arranged above the upper valve seat in the valve casing, and a lower valve core is arranged above the lower valve seat. The upper valve element and the lower valve element are connected through a connecting rod, and a second threaded rod is rotationally connected to the center of the top of the upper valve element. By arranging the lower valve seat capable of moving up and down, when the upper valve seat breaks down, the lower valve seat extends to the highest position, the valve can be sealed through cooperation between the lower valve seat and the lower valve element, double guarantees are provided for the valve, the two valve seats can be used at the same time, and the closure effect of the valve can be effectively improved.

Description

Technical Field

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

[0002] Valves play a vital role in various industrial fields, especially in fluid control systems. They are an important component of the pipeline system and are used to control the flow of fluids, including cutoff, regulation, diversion and other operations. There are many types of valves, among which the stop valve is a commonly used valve type, which is mainly used to cut off or connect the fluid in the pipeline.

[0003] However, the traditional globe valve design usually has only one valve seat, which means that once the valve seat is damaged or fails due to wear, corrosion or other reasons, the entire valve needs to be replaced or repaired, which not only increases maintenance costs, but may also lead to extended downtime in the production process, thus affecting production efficiency and economic benefits. In view of this, we propose a globe valve with a spare valve seat. Utility Model Content

[0004] In order to make up for the above deficiencies, the utility model provides a stop valve with a spare valve seat.

[0005] The technical solution of the utility model is:

[0006] A stop valve with a spare valve seat comprises a valve housing, an upper valve seat is installed near the upper part of the valve housing, and a lower valve seat which can move up and down is provided below the upper valve seat, an upper valve core is provided above the upper valve seat in the valve housing, and a lower valve core is provided above the lower valve seat, the upper valve core and the lower valve core are connected by a connecting rod, a second threaded rod is rotatably connected at the center of the top of the upper valve core, the second threaded rod extends from the top of the valve housing and is threadedly connected to the valve housing, when the lower valve seat moves upward to the highest point and the lower valve core moves downward to the lowest point, the two are tightly fitted and at this time the upper valve seat is tightly fitted to the upper valve core.

[0007] As a preferred technical solution, a water outlet pipe is provided near the top of the outer wall of the valve housing, and a water inlet pipe is provided near the bottom. When the lower valve seat is at the lowest point, its top is lower than the water inlet pipe, and the upper valve seat is lower than the water outlet pipe.

[0008] As a preferred technical solution, the lower valve seat is provided with a through hole for fluid to pass through.

[0009] As a preferred technical solution, a spherical bin is provided in the middle of the valve housing, and the lower valve core is always located in the spherical bin during the up and down movement, and when the lower valve seat contacts the lower valve core, the lower valve seat seals the channel below the spherical bin.

[0010] As a preferred technical solution, an adjusting mechanism for driving the lower valve seat to move up and down is provided inside the valve housing and below the lower valve seat.

[0011] As a preferred technical solution, the adjusting mechanism includes a first threaded rod fixed at the bottom center of the lower valve seat, a second gear is threadedly connected to the first threaded rod, a first gear is meshingly installed on the second gear, an adjusting knob for driving the first gear to rotate is rotatably installed on the outer wall of the valve housing, and the second gear is rotatably connected to the inner wall of the valve housing through a bearing arranged on its outside.

[0012] As a preferred technical solution, a limiting rod is fixedly installed at the center of the bottom of the valve housing and is slidably connected to the second threaded rod up and down.

[0013] As a preferred technical solution, a driving shaft is coaxially fixed to the top of the second threaded rod, and a driving rod perpendicular to the second threaded rod is fixedly mounted on the circumferential outer wall of the driving shaft.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model provides a lower valve seat that can move up and down. When the upper valve seat fails, the lower valve seat is extended to the highest point, and the valve can be sealed by the cooperation between the lower valve seat and the lower valve core, thereby providing double protection for the valve. Moreover, the two valve seats can be used at the same time, which can effectively improve the flow cutoff effect of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 For the utility model Figure 1 Schematic diagram of the internal structure of the first;

[0018] Figure 3 For the utility model Figure 1 Schematic diagram of the internal structure of the second;

[0019] Figure 4 It is a structural schematic diagram of the upper valve seat and the upper valve core in the utility model;

[0020] Figure 5 It is a structural schematic diagram of the lower valve seat and the lower valve core in the utility model.

[0021] The meaning of each number in the figure is:

[0022] 1. Valve housing; 10. Water inlet pipe; 11. Water outlet pipe; 12. Lower valve seat; 120. Perforation; 13. Upper valve seat; 14. Upper valve core; 15. Lower valve core; 16. Connecting rod; 17. Second threaded rod; 2. Adjusting knob; 20. First gear; 21. Second gear; 210. Bearing; 22. First threaded rod; 23. Limiting rod; 3. Drive shaft; 30. Drive rod. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0025] A stop valve with a spare valve seat comprises a valve housing 1, wherein an upper valve seat 13 is installed near the upper part of the valve housing 1, and a lower valve seat 12 which can move up and down is provided below the upper valve seat 13, an upper valve core 14 is provided above the upper valve seat 13 in the valve housing 1, and a lower valve core 15 is provided above the lower valve seat 12, the upper valve core 14 and the lower valve core 15 are connected by a connecting rod 16, a second threaded rod 17 is rotatably connected at the center of the top of the upper valve core 14, the second threaded rod 17 extends from the top of the valve housing 1 and is threadedly connected to the valve housing 1, when the lower valve seat 12 moves upward to the highest point and the lower valve core 15 moves downward to the lowest point, the two are tightly fitted and at this time the upper valve seat 13 is tightly fitted with the upper valve core 14. By providing a lower valve seat 12 that can move up and down, when the upper valve seat 13 fails, the lower valve seat 12 is extended to the highest point, and the valve can be sealed through the cooperation between the lower valve seat 12 and the lower valve core 15, providing double protection for the valve, and the two valve seats can be used at the same time, which can effectively improve the flow cutoff effect of the valve.

[0026] As a preferred embodiment of the present invention, a water outlet pipe 11 is provided near the top of the outer wall of the valve housing 1, and a water inlet pipe 10 is provided near the bottom. When the lower valve seat 12 is at the lowest point, its top is lower than the water inlet pipe 10, and the upper valve seat 13 is lower than the water outlet pipe 11. This design allows the fluid to enter from the water inlet pipe 10 and flow out from the water outlet pipe 11 when the stop valve is closed, without causing damage to the lower valve seat 12.

[0027] As a preferred embodiment of the present invention, a through hole 120 for fluid to pass through is provided on the lower valve seat 12, so as to ensure the flowability of the entire valve when the lower valve seat 12 is used.

[0028] As a preferred embodiment of the present invention, a ball-type bin is provided in the middle of the valve housing 1, and the lower valve core 15 is always located in the ball-type bin during the process of moving up and down, and when the lower valve seat 12 contacts the lower valve core 15, the lower valve seat 12 seals the passage below the ball-type bin. The ball-type bin can prevent the lower valve core 15 from blocking the flow of the valve, and when the lower valve seat 12 contacts the lower valve core 15, the lower valve seat 12 seals the passage below the ball-type bin, that is, it can ensure that the valve can be sealed when the lower valve seat 12 is used.

[0029] As a preferred embodiment of the present invention, an adjusting mechanism for driving the lower valve seat 12 to move up and down is provided inside the valve housing 1 below the lower valve seat 12. The adjusting mechanism includes a first threaded rod 22 fixed at the bottom center of the lower valve seat 12, a second gear 21 is threadedly connected to the first threaded rod 22, a first gear 20 is meshedly installed on the second gear 21, an adjusting knob 2 for driving the first gear 20 to rotate is rotatably installed on the outer wall of the valve housing 1, and the second gear 21 is rotatably connected to the inner wall of the valve housing 1 through a bearing 210 provided on the outer side thereof. When the position of the lower valve seat 12 is adjusted upward, the adjusting knob 2 is rotated, and the first gear 20 is driven to rotate by the adjusting knob 2, and then the second gear 21 meshed with the first gear 20 is driven to rotate, that is, the first threaded rod 22 threadedly connected to the second gear 21 can be driven to move up and down, that is, the lower valve seat 12 located at the top of the first threaded rod 22 can be driven to move upward.

[0030] As a preferred embodiment of the present invention, a limit rod 23 is fixedly installed at the bottom center of the valve housing 1 and is slidably connected to the first threaded rod 22. The limit rod 23 is used to limit the rotation of the first threaded rod 22, and can also increase the stability of the first threaded rod 22 when it moves up and down.

[0031] As a preferred embodiment of the present invention, a driving shaft 3 is coaxially fixed to the top of the second threaded rod 17, and a driving rod 30 perpendicular to the second threaded rod 17 is fixedly installed on the circumferential outer wall of the driving shaft 3. The driving shaft 3 and the driving rod 30 are provided to increase the convenience of driving the second threaded rod 17 to rotate.

[0032] When the stop valve with a spare valve seat of the utility model is in use, in the initial state of the stop valve, the lower valve seat 12 is located at the lowest position, at which time the perforation 120 is aligned with the water inlet pipe 10, allowing the fluid to flow from the water inlet pipe 10 into the valve housing 1, and the upper valve seat 13 and the upper valve core 14 are in a separated state, and the fluid can continue to flow upward through the gap between the upper valve seat 13 and the upper valve core 14, and finally flow out from the water outlet pipe 11;

[0033] When it is necessary to cut off the flow of fluid, the drive shaft 3 is driven to rotate by the drive rod 30, driving the upper valve core 14 and the lower valve core 15 to move downward. The upper valve core 14 fits tightly with the upper valve seat 13 during the downward movement, that is, the valve can be closed. When the upper valve seat 13 fails or the two valve seats need to be used at the same time, the first gear 20 and the second gear 21 are driven to rotate by rotating the adjusting knob 2. Since the first threaded rod 22 is threadedly connected to the second gear 21, the first threaded rod 22 will move up and down, driving the lower valve seat 12 to rise and fit tightly with the lower valve core 15, thereby achieving sealing of the fluid. When it is necessary to resume the flow of the fluid, it is only necessary to rotate the drive shaft 3 to adjust the two valve cores up and down.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A stop valve with a spare valve seat, comprising a valve housing (1), characterized in that: An upper valve seat (13) is installed near the upper part of the valve housing (1), and a lower valve seat (12) that can move up and down is provided below the upper valve seat (13). An upper valve core (14) is provided above the upper valve seat (13) in the valve housing (1), and a lower valve core (15) is provided above the lower valve seat (12). The upper valve core (14) and the lower valve core (15) are connected by a connecting rod (16). A second threaded rod (17) is rotatably connected to the center of the top of the upper valve core (14). The second threaded rod (17) extends from the top of the valve housing (1) and is threadedly connected to the valve housing (1). When the lower valve seat (12) moves upward to the highest position and the lower valve core (15) moves downward to the lowest position, the two are tightly fitted and at this time, the upper valve seat (13) and the upper valve core (14) are tightly fitted.

2. The stop valve with a spare valve seat according to claim 1, characterized in that: The outer wall of the valve housing (1) is provided with a water outlet pipe (11) near the top and a water inlet pipe (10) near the bottom; when the lower valve seat (12) is at the lowest point, its top is lower than the water inlet pipe (10), and the upper valve seat (13) is lower than the water outlet pipe (11).

3. The stop valve with a spare valve seat according to claim 2, characterized in that: The lower valve seat (12) is provided with a through hole (120) for fluid to pass through.

4. The stop valve with a spare valve seat according to claim 3, characterized in that: A spherical bin is provided in the middle of the valve housing (1), and the lower valve core (15) is always located in the spherical bin during the process of moving up and down, and when the lower valve seat (12) contacts the lower valve core (15), the lower valve seat (12) seals the channel below the spherical bin.

5. The stop valve with a spare valve seat according to claim 4, characterized in that: An adjusting mechanism for driving the lower valve seat (12) to move up and down is provided inside the valve housing (1) and below the lower valve seat (12).

6. The stop valve with a spare valve seat according to claim 5, characterized in that: The regulating mechanism comprises a first threaded rod (22) fixed at the bottom center of the lower valve seat (12), a second gear (21) being threadedly connected to the first threaded rod (22), a first gear (20) being meshingly mounted on the second gear (21), an regulating knob (2) for driving the first gear (20) to rotate being rotatably mounted on the outer wall of the valve housing (1), and the second gear (21) being rotatably connected to the inner wall of the valve housing (1) via a bearing (210) arranged on the outer side thereof.

7. The stop valve with a spare valve seat according to claim 6, characterized in that: A limiting rod (23) is fixedly mounted at the center of the bottom of the valve housing (1) and is slidably connected to the first threaded rod (22) up and down.

8. The stop valve with a spare valve seat according to claim 7, characterized in that: A driving shaft (3) is coaxially fixed to the top of the second threaded rod (17), and a driving rod (30) perpendicular to the second threaded rod (17) is fixedly mounted on the circumferential outer wall of the driving shaft (3).

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