Stop valve with non-return function

Abstract

The utility model relates to the technical field of stop valves, and discloses a stop valve with a non-return function, which comprises a valve body, a valve seat is arranged in the valve body, a channel is arranged in the middle of the valve seat, a sleeve is arranged in the channel, a gasket is arranged at the top end of the sleeve, a sealing gasket is arranged at the bottom end of the gasket, and the valve seat is arranged in the valve body. The gasket is fixedly connected with the top end of the valve seat through a screw, and a fluid non-return assembly for preventing fluid from flowing back is arranged in the sleeve. The channel can be opened and closed through the opening and closing assembly, the valve body can be opened and closed, after the channel is opened, fluid can flow in one direction through the fluid non-return assembly, backflow of the fluid is avoided, the fluid non-return assembly and the opening and closing assembly are located on the same vertical plane and fixed to the valve seat, after the valve deck is disassembled, the fluid non-return assembly can be assembled and disassembled, and therefore the valve deck can be assembled and disassembled conveniently. And the maintenance is convenient after damage.

Description

Technical Field

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

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. When the medium enters the valve from under the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem must be large, otherwise the valve stem will bend.

[0003] Its application number "201822196718.9" discloses a "stop valve with a check function", which "comprises a valve cover, a valve body, a screw, a valve stem, a stop valve disc, a check valve disc, a fixing seat, a connecting rod and a handwheel, the valve cover is fixedly connected to the valve body by the screw, a water inlet is provided on one side of the outside of the valve body, and a water outlet is provided on the other side, a stop valve chamber is provided inside the valve body, a check valve chamber is provided inside the valve body, a connecting chamber is provided below the stop valve chamber and the check valve chamber, a screw hole is provided on the top of the valve cover, a stop valve disc is provided in the stop valve chamber, the valve stem passes through the screw hole and is threadedly connected to the screw hole, a fixing seat is fixedly installed on the side of the check valve chamber away from the water outlet, and the fixing seat is hinged to the check valve disc through the connecting rod. The utility model has a simple structure and is easy to operate, maximizes the guarantee of medium flow requirements, and optimizes the opening and closing effects."

[0004] However, the above method still has the following defects: the check valve disc can be quickly opened and closed under the impact of medium pressure by using a hinged connecting rod, which ensures good opening and closing performance. However, the check valve disc is far away from the stop valve plate, which is relatively hidden, inconvenient to install and disassemble, and difficult to repair once damaged. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a stop valve with a check function, which has the advantages of being easy to disassemble and repair, and solves the problems raised by the above-mentioned background technology.

[0006] The utility model provides the following technical solution: a stop valve with a check function, comprising a valve body, a valve seat provided inside the valve body, a channel opened in the middle of the valve seat, a sleeve provided inside the channel, a gasket provided at the top end of the sleeve, a sealing gasket provided at the bottom end of the gasket, the gasket fixedly connected to the top end of the valve seat by screws, a fluid check assembly for preventing fluid backflow provided inside the sleeve, a valve cover provided at the top end of the valve body, and an opening and closing assembly for controlling the opening and closing of the channel provided in the middle of the valve cover.

[0007] As an optimal technical solution of the present invention, the fluid check assembly includes a support ring and a sealing plate. The support ring is fixedly connected to the inner wall of the bottom of the sleeve. The surface of the support ring is slidably connected to a plurality of guide pillars. The surface of the guide pillars is sleeved with a reset spring. The bottom end of the guide pillar is connected to the top end of the sealing plate, and the top of the sealing plate is snap-connected with a sealing ring.

[0008] As an optimal technical solution of the present invention, a limiting ring is provided at the top of the support ring, the reset spring is located between the limiting ring and the support ring, the limiting ring is slidingly connected to the inner wall of the sleeve, and the top of the guide column is provided with a screw connected to the limiting ring.

[0009] As an optimal technical solution of the present invention, flange 1 is welded to the top of the valve body, flange 2 is welded to the bottom of the valve cover, the top of flange 1 is fixedly connected to the bottom end of flange 2 by bolts, and a sealing ring 2 is provided between flange 1 and flange 2.

[0010] As a preferred technical solution of the present invention, the opening and closing assembly includes a valve stem, a valve flap is fixedly provided at the bottom end of the valve stem, a rubber ring is snap-connected to the bottom end of the valve flap, and the rubber ring is coaxial with the channel.

[0011] As an optimal technical solution of the present invention, a clamping block is provided at the top of the valve stem, and the valve stem is connected to a handle through the clamping block. A stud is provided at the top of the clamping block, and a nut is threadedly connected to the stud.

[0012] As an optimal technical solution of the present invention, a rod sleeve is provided inside the valve cover, the inner wall of the rod sleeve is provided with a threaded sleeve, the valve stem is threadedly connected to the threaded sleeve, the bottom end of the rod sleeve is provided with a reinforcement ring, and the inner walls of the top end and the bottom end of the rod sleeve are both provided with packing for sealing the valve stem.

[0013] As an optimal technical solution of the present invention, both ends of the valve body are provided with connecting pipes, one end of the connecting pipe is provided with a flange three, and one side of the flange three is snap-connected with a sealing ring three.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The channel can be opened and closed by the opening and closing assembly, and the valve body can be opened and closed. After the channel is opened, the fluid can flow in one direction through the fluid check assembly, avoiding the backflow of the fluid. The fluid check assembly and the opening and closing assembly are located on the same vertical plane and fixed on the valve seat. After removing the valve cover, it can be installed and removed, which is convenient for maintenance after damage.

[0016] 2. By fixing the gasket on the valve seat, the sealing pad at the bottom of the gasket can seal it, so that the sleeve can be stably installed. The sleeve can support the fluid check assembly, and the gasket can be used in conjunction with the opening and closing assembly. By removing the gasket, the sleeve carrying the fluid check assembly can be taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the valve seat structure of the utility model;

[0020] Figure 4 This is a schematic structural diagram of the fluid check assembly of the present utility model;

[0021] Figure 5 For this utility model Figure 2 A schematic diagram of the enlarged structure at point A;

[0022] Figure 6 This is a structural diagram of the opening and closing component of the utility model.

[0023] In the figure: 1. Valve body; 2. Valve seat; 3. Channel; 4. Sleeve; 5. Gasket; 6. Sealing gasket; 7. Fluid check assembly; 701. Support ring; 702. Guide column; 703. Return spring; 704. Sealing plate; 705. Sealing ring 1; 706. Limiting ring; 707. Screw; 8. Flange 1; 9. Valve cover; 10. Flange 2; 11. Sealing ring 2; 12. Opening and closing assembly; 1201. Valve stem; 1202. Valve disc; 1203. Rubber ring; 1204. Block; 1205. Handle; 1206. Stud; 13. Rod sleeve; 14. Threaded sleeve; 15. Packing; 16. Reinforcement ring; 17. Connecting pipe; 18. Flange 3; 19. Sealing ring 3. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figures 1 to 6, a stop valve with a check function includes a valve body 1, a valve seat 2 is welded inside the valve body 1, a channel 3 is opened in the middle of the valve seat 2, a sleeve 4 is snap-connected inside the channel 3, a gasket 5 is welded on the top of the sleeve 4, a sealing gasket 6 is snap-connected at the bottom end of the gasket 5, the gasket 5 is fixedly connected to the top of the valve seat 2 by screws, a fluid check assembly 7 is provided inside the sleeve 4 to prevent fluid backflow, a valve cover 9 is fixedly installed on the top of the valve body 1 by bolts, an opening and closing assembly 12 for controlling the opening and closing of the channel 3 is provided in the middle of the valve cover 9, the channel 3 can be opened and closed by the opening and closing assembly 12, and the valve body 1 can be opened and closed. After the channel 3 is opened, the fluid can flow in one direction through the fluid check assembly 7, thereby preventing the backflow of the fluid;

[0026] In this embodiment, preferably, the fluid check assembly 7 includes a support ring 701 and a sealing plate 704. The support ring 701 is fixedly connected to the inner wall of the bottom of the sleeve 4. The surface of the support ring 701 is slidably connected to a plurality of guide pillars 702. The surface of the guide pillars 702 is sleeved with a reset spring 703. The bottom end of the guide pillar 702 is connected to the top of the sealing plate 704. The top of the sealing plate 704 is snap-connected with a sealing ring 705. The top of the support ring 701 is provided with a limiting ring 706. The reset spring 703 is located between the limiting ring 706 and the support ring 701. The reset spring 703 can adjust the position of the limiting ring 706 and the support ring 701. The support ring 701 is supported between the sealing rings 701, so that the sealing ring 705 of the sealing plate 704 can fit the bottom end of the sleeve 4, which can play a sealing role and prevent the reverse flow of the fluid. During the fluid conveying process, the sealing plate 704 can be pressurized under the action of the fluid pressure, thereby compressing the return spring 703 to ensure the normal flow of the fluid. The limiting ring 706 is slidably connected to the inner wall of the sleeve 4, and the limiting ring 706 can prevent the guide column 702 from falling off. The top of the guide column 702 is provided with a screw 707 connected to the limiting ring 706, and the limiting ring 706 can be installed and removed by the screw 707;

[0027] In this embodiment, preferably, the opening and closing assembly 12 includes a valve stem 1201, a valve flap 1202 is fixedly provided at the bottom end of the valve stem 1201, a rubber ring 1203 is clamped and connected at the bottom end of the valve flap 1202, the rubber ring 1203 is coaxial with the channel 3, a clamping block 1204 is provided at the top end of the valve stem 1201, the valve stem 1201 is clamped and connected to a handle 1205 through the clamping block 1204, a stud 1206 is provided at the top end of the clamping block 1204, and the stud 1206 is threadedly connected to a nut, and a rod sleeve 13 is provided inside the valve cover 9, and the rod sleeve 13 is provided with a screw thread. A threaded sleeve 14 is provided on the inner wall, and the valve stem 1201 is threadedly connected to the threaded sleeve 14. The handle 1205 can be installed and removed by means of a stud 1206 and a nut. By rotating the handle 1205, the clamping block 1204 can transmit torque to adjust the height of the valve disc 1202. A reinforcement ring 16 is provided at the bottom end of the rod sleeve 13, which can reinforce the bottom of the rod sleeve 13. The inner walls of the top and bottom ends of the rod sleeve 13 are both provided with packing 15 that seals the valve stem 1201, and the packing 15 can prevent fluid leakage.

[0028] In this embodiment, preferably, flange 1 8 is welded to the top of the valve body 1, and flange 2 10 is welded to the bottom of the valve cover 9. The top of flange 1 8 is fixedly connected to the bottom end of flange 2 10 by bolts. A sealing ring 2 11 is provided between flange 1 8 and flange 2 10. The valve cover 9 can be installed and removed through flange 1 8 and flange 2 10. The sealing ring 2 11 can seal the valve cover 9. Connecting pipes 17 are provided at both ends of the valve body 1. Flange 3 18 is provided at one end of the connecting pipe 17. A sealing ring 3 19 is engaged and connected to one side of flange 3 18. The connecting pipe 17 can be connected to the fluid pipeline through flange 3 18.

[0029] When in use, the valve body 1 is connected to the fluid pipeline through the flange 3 18, and the sealing ring 3 19 can seal the connection between the flange 3 18 and the fluid pipeline. Then, the handle 1205 of the opening and closing component 12 is rotated to lift the valve disc 1202 to open the channel 3. The fluid can reach the sleeve 4 through the channel 3. Under the action of the fluid pressure, the sealing plate 704 of the fluid check component 7 can be pressurized, thereby compressing the reset spring 703 to ensure the normal flow of the fluid. After the fluid is transported, the reset spring 703 can push the sealing plate 704 to return to its original position, so that the sealing ring 1 705 of the sealing plate 704 can fit the bottom end of the sleeve 4, which can play a sealing role and prevent the reverse flow of the fluid.

[0030] When it is necessary to close the channel 3, turn the handle 1205 in the opposite direction to control the valve disc 1202 to descend, so that it puts pressure on the gasket 5. The sealing ring 1 705 and the sealing gasket 6 can seal the gasket 5, the valve disc 1202 and the valve seat 2 under pressure, thereby avoiding fluid leakage. When it is necessary to disassemble the fluid check assembly 7, first remove the valve cover 9 through the flange 2 10, then remove the gasket 5 from the valve seat 2, take out the gasket 5 and the sleeve 4, and then use the screw 707 to disassemble the guide column 702 and the limit ring 706, and then remove the sealing plate 704 and the return spring 703, so that they can be repaired.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve with a check function, comprising a valve body (1), characterized in that: A valve seat (2) is provided inside the valve body (1), a channel (3) is provided in the middle of the valve seat (2), a sleeve (4) is provided inside the channel (3), a gasket (5) is provided at the top end of the sleeve (4), a sealing gasket (6) is provided at the bottom end of the gasket (5), the gasket (5) is fixedly connected to the top end of the valve seat (2) by screws, a fluid check assembly (7) for preventing fluid backflow is provided inside the sleeve (4), a valve cover (9) is provided at the top end of the valve body (1), and an opening and closing assembly (12) for controlling the opening and closing of the channel (3) is provided in the middle of the valve cover (9).

2. The stop valve with a check function according to claim 1, characterized in that: The fluid check assembly (7) comprises a support ring (701) and a sealing plate (704); the support ring (701) is fixedly connected to the inner wall of the bottom of the sleeve (4); a plurality of guide pillars (702) are slidably connected to the surface of the support ring (701); a reset spring (703) is sleeved on the surface of the guide pillars (702); the bottom end of the guide pillars (702) is connected to the top end of the sealing plate (704); and the top of the sealing plate (704) is snap-fitted with a sealing ring (705).

3. The stop valve with a check function according to claim 2, characterized in that: A limiting ring (706) is provided at the top of the support ring (701), the return spring (703) is located between the limiting ring (706) and the support ring (701), the limiting ring (706) is slidably connected to the inner wall of the sleeve (4), and a screw (707) connected to the limiting ring (706) is provided at the top of the guide column (702).

4. The stop valve with a check function according to claim 1, characterized in that: The top of the valve body (1) is welded with flange 1 (8), the bottom of the valve cover (9) is welded with flange 2 (10), the top of flange 1 (8) is fixedly connected to the bottom of flange 2 (10) by bolts, and a sealing ring 2 (11) is provided between flange 1 (8) and flange 2 (10).

5. The stop valve with a check function according to claim 1, characterized in that: The opening and closing assembly (12) comprises a valve stem (1201), a valve flap (1202) being fixedly provided at the bottom end of the valve stem (1201), a rubber ring (1203) being snap-connected to the bottom end of the valve flap (1202), and the rubber ring (1203) being coaxial with the channel (3).

6. The stop valve with a check function according to claim 5, characterized in that: The top end of the valve stem (1201) is provided with a clamping block (1204), and the valve stem (1201) is connected to a handle (1205) through the clamping block (1204). The top end of the clamping block (1204) is provided with a stud (1206), and the stud (1206) is threadedly connected to a nut.

7. The stop valve with a check function according to claim 5, characterized in that: The valve cover (9) is provided with a rod sleeve (13) inside, the inner wall of the rod sleeve (13) is provided with a threaded sleeve (14), the valve stem (1201) is threadedly connected to the threaded sleeve (14), the bottom end of the rod sleeve (13) is provided with a reinforcement ring (16), and the inner walls of the top end and the bottom end of the rod sleeve (13) are both provided with packing (15) for sealing the valve stem (1201).

8. The stop valve with a check function according to claim 1, characterized in that: Both ends of the valve body (1) are provided with connecting pipes (17), one end of the connecting pipe (17) is provided with a flange three (18), and one side of the flange three (18) is snap-connected with a sealing ring three (19).

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