Wear-resistant brass ball valve
By setting loosely connected sealing gaskets and rubber sleeves in the brass ball valve, the axial movement of the sealing gaskets and automatically compensate for wear is achieved by using water pressure, which solves the problem of easy wear of the sealing gaskets and extends the service life of the ball valve.
Patent Information
- Application Number
- CN202421377205.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-06-17
AI Technical Summary
The sealing gaskets of existing brass ball valves are easily worn due to tight connections, resulting in poor sealing effect and short service life.
In the ball valve, the sealing gasket close to the water inlet side of the runner is set as a loose connection, and a rubber sleeve and a sealing sheet are installed thereon. The axial movement of the sealing gasket and automatic compensation of wear are achieved by using water pressure, and a good seal between the sealing gasket and the ball is achieved through the pressure relief groove.
It improves the wear resistance of the sealing gasket, extends the service life of the ball valve, and is suitable for high-pressure water supply systems.
Smart Images
Figure CN223049454U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of brass ball valves, and particularly relates to a wear-resistant brass ball valve. Background Art
[0002] Brass ball valves (referred to as ball valves for short) are widely used in water supply systems. The structure of existing ball valves, as Figure 4 shown, includes a valve body. A flow channel is provided inside the valve body. A ball cavity is provided in the middle of the valve body. A sphere is provided in the ball cavity. The diameter of the ball cavity is larger than the diameter of the sphere. A through hole coaxial with the flow channel is provided inside the sphere. Sealing gaskets coaxial with the flow channel are provided on both sides of the sphere. The common material of the sealing gaskets is plastic. Annular mounting grooves are provided on both sides of the ball cavity. The sealing gaskets are located in the mounting grooves. The sealing gaskets are in surface contact with the sphere to form a sealing surface. A valve stem is provided at the top of the sphere. The upper end of the valve stem extends out of the valve body and is provided with a handle. A sealing ring is provided between the valve stem and the valve body. A pin shaft rotatably connected to the valve body is provided at the bottom of the sphere. The pin shaft is coaxial with the valve stem. When the through hole is coaxial with the flow channel, the ball valve is in the maximum flow state. By driving the valve stem to rotate with the handle, the valve stem drives the sphere to rotate, so that an included angle is formed between the through hole and the flow channel. The larger the angle, the smaller the water flow passing through. Usually, when the handle rotates 90°, the sealing gasket does not intersect with the through hole and the water flow is zero, and the ball valve is in the closed state.
[0003] Existing ball valves have the following defects. In order to ensure good sealing effect between the sphere and the sealing gasket, the sealing gasket is tightly fitted between the sphere and the valve body, so that there is compressive stress between the sphere and the sealing gasket. However, there is relative movement between the sphere and the sealing gasket, and the sealing gasket is prone to wear. Water may still seep when the ball valve is closed, and the service life is relatively short. Content of the Utility Model
[0004] The purpose of the utility model is to provide a wear-resistant brass ball valve. The utility model has the advantage of wear resistance and a relatively long service life.
[0005] The technical solution of the utility model: A wear-resistant brass ball valve includes a valve body. A flow channel is provided inside the valve body. A ball cavity is provided in the middle of the valve body. A sphere is provided in the ball cavity. A through hole coaxial with the flow channel is provided inside the sphere. Sealing gaskets are provided on both sides of the sphere. Annular mounting grooves are provided on both sides of the ball cavity. The sealing gaskets are located in the mounting grooves. The sealing gasket near the water outlet side of the flow channel is tightly fitted between the valve body and the sphere. A pressure relief groove is provided between the sealing gasket and the sphere. The sealing gasket near the water inlet side of the flow channel is loosely fitted between the valve body and the sphere, and the sealing gasket can axially move under the action of an external force.
[0006] In the aforementioned wear-resistant brass ball valve, a rubber sleeve is provided on the outer peripheral surface of the sealing gasket. An annular sealing piece is provided on the outer peripheral surface of the rubber sleeve. The sealing piece is conical, and the outer ring of the sealing piece inclines towards the water inlet side of the flow channel.
[0007] In the aforementioned wear-resistant brass ball valve, the rubber sleeve is tightly and fittingly connected to the sealing washer.
[0008] In the aforementioned wear-resistant brass ball valve, there are three sealing sheets.
[0009] In the aforementioned wear-resistant brass ball valve, a flange ring that contacts the outer end face of the sealing washer is formed by radially inward extension at the outer end of the rubber sleeve, and a gap of 0.3 - 1 mm is formed between the flange ring and the bottom surface of the corresponding installation groove.
[0010] Compared with the prior art, on the basis of the existing ball valve, the utility model sets the sealing washer near the water inlet side of the flow channel (abbreviated as the left sealing washer) to be loosely and fittingly connected between the valve body and the ball. The left sealing washer can move axially, and the rubber sleeve is used to achieve the seal between the left sealing washer and the valve body. A pressure relief groove is provided on the sealing washer near the water outlet side of the flow channel (abbreviated as the right sealing washer) to connect the water channel and the ball cavity. When the ball valve is in the closed state, a pressure difference is formed at both ends of the left sealing washer, and the left sealing washer is pressed tightly against the ball, playing a good sealing role. Since there is no tight and fitting connection between the left sealing washer and the ball, the wear rate of the left sealing washer is relatively slow. Even if it wears, due to the axial movement of the left sealing washer, the wear allowance can be automatically compensated, making the left sealing washer have good wear resistance and still be usable, so that the service life of the ball valve is long. In summary, the utility model has the advantages of wear resistance and a long service life. Description of the Drawings
[0011] Figure 1 is a schematic structural diagram of the utility model.
[0012] Figure 2 is Figure 1 an enlarged view at A.
[0013] Figure 3 is Figure 1 an enlarged view at B.
[0014] Figure 4 is a schematic structural diagram of the existing ball valve.
[0015] The reference signs in the drawings are: 1 - valve body, 2 - flow channel, 3 - ball cavity, 4 - ball, 5 - through hole, 8 - installation groove, 9 - rubber sleeve, 10 - sealing sheet, 11 - flange ring, 13 - valve stem, 14 - handle, 15 - sealing ring, 16 - pin shaft, 17 - gap, 18 - pressure relief groove. Detailed Embodiment
[0016] The following further describes the utility model in conjunction with the drawings and embodiments, but it shall not be used as a basis for restricting the utility model.
[0017] Embodiment. A wear-resistant brass ball valve is improved on the basis of the existing ball valve. As Figures 1 to 3 shown, it includes a valve body 1. A flow channel 2 is provided inside the valve body 1. A ball cavity 3 is provided in the middle of the valve body 1. A sphere 4 is provided in the ball cavity 3. The diameter of the ball cavity 3 is larger than the diameter of the sphere 4. A through hole 5 coaxial with the flow channel 2 is provided inside the sphere 4. Sealing gaskets (6, 7) coaxial with the flow channel 2 are provided on both sides of the sphere 4. The materials of the sealing gaskets (6, 7) are plastics. Annular and stepped mounting grooves 8 are provided on both sides of the ball cavity 3. The sealing gaskets (6, 7) are located in the mounting grooves 8. The sealing gaskets are in surface contact with the sphere 4 to form a sealing surface. A valve stem 13 is provided at the top of the sphere 4. The upper end of the valve stem 13 extends out of the valve body 1 and is provided with a handle 14. A sealing ring 15 is provided between the valve stem 13 and the valve body 1. A pin shaft 16 rotatably connected to the valve body 1 is provided at the bottom of the sphere 4. The pin shaft 16 is coaxial with the valve stem 13. When the through hole 5 is coaxial with the flow channel 2, the ball valve is in the maximum flow state. By driving the valve stem 13 to rotate through the handle 14, the valve stem 13 drives the sphere 4 to rotate, so that an included angle is formed between the through hole 5 and the flow channel 2. The larger the angle, the smaller the water flow passing through. Usually, when the handle 14 rotates 90°, the sealing gaskets (6, 7) do not intersect with the through hole 5, the water flow is zero, and the ball valve is in the closed state.
[0018] The features are as follows: The sealing gasket 6 near the water outlet side of the flow channel 2 is tightly connected between the valve body 1 and the sphere 4. A pressure relief groove 18 is provided between the sealing gasket 6 and the sphere (4). The pressure relief groove 18 is formed on the sealing gasket 6. The pressure relief groove 18 communicates with the ball cavity 3 and the water outlet side of the flow channel 2. The sealing gasket 7 near the water inlet side of the flow channel 2 is loosely connected between the valve body 1 and the sphere 4. The sealing gasket 7 can axially move under the action of an external force.
[0019] A rubber sleeve 9 is provided on the outer peripheral surface of the sealing gasket 7. The rubber sleeve 9 is tightly connected with the sealing gasket 7. Three annular sealing pieces 10 are provided on the outer peripheral surface of the rubber sleeve 9. The sealing pieces 10 are conical. The outer ring of the sealing piece 10 inclines towards the water inlet side of the flow channel 2. The sealing pieces 10 are elastically connected to the side walls of the corresponding mounting grooves 8. When water enters the ball valve, the sealing pieces 10 extend outwards under the action of water pressure and closely adhere to the side walls of the mounting grooves 8. The greater the water pressure, the better the sealing performance.
[0020] A flange ring 11 radially extending inwards is formed at the outer side end of the rubber sleeve 9 and contacts the outer side end surface of the sealing gasket 7. The flange ring 11 is used for axially fixing the position between the rubber sleeve 9 and the sealing gasket 7, preventing the rubber sleeve 9 from axially moving to the right and falling off the sealing gasket 7 under the action of water pressure, and improving the service life of the ball valve.
[0021] A gap 17 of about 0.5 mm is formed between the flange ring 11 and the bottom surface of the corresponding mounting groove 8. The gap 17 is used for the water entering the ball valve to enter the left end surface of the sealing gasket 7, forming water pressure on the sealing gasket 7 and pressing the sealing gasket 7 against the sphere 4.
[0022] Compared with the existing ball valves, the actual improvement made by the present utility model is to deepen the depth of the installation groove 8 near the water inlet side of the flow channel 2 or to make the sealing washer 7 near the water inlet side of the flow channel 2 thinner, so that the sealing washer 7 can move axially; then a rubber sleeve 9 with a sealing piece 10 is arranged on the sealing washer 7, so that the outer side of the sealing washer 7 is sealed with the valve body 1, while the inner side of the sealing washer 7 is sealed with the ball 4. A pressure relief groove 18 connecting the ball cavity and the flow channel is arranged on the sealing washer 6, and the sealing washer 6 has actually lost its sealing function, and only the sealing washer 7 plays a sealing role.
[0023] Working principle: When the ball valve is open, there is water flow through the ball valve itself, and the sealing washers (6, 7) do not need to play a sealing role. When the ball valve is closed, the water outlet side of the flow channel 2 is at low pressure, and the water inlet side of the flow channel 2 is at high pressure. Since the ball cavity 3 is connected to the water outlet side of the flow channel 2 through the pressure relief groove 18, the water inlet end face of the sealing washer 7 is subjected to the water pressure, so that the sealing washer 7 is tightly attached to the ball 4, realizing good sealing between the sealing washer 7 and the ball 4. The sealing between the sealing washer 7 and the valve body 1 is achieved through the sealing piece 10. Under the action of water pressure, the sealing piece 10 is pressed against the side wall of the installation groove 8, so that the sealing effect between the sealing washer 7 and the valve body 1 is good.
[0024] Since there is no tight fit connection between the sealing washer 7 and the ball 4, the wear rate of the sealing washer 7 is relatively slow. Even if it wears, since the sealing washer 7 can move axially, it can automatically compensate for the wear allowance, so that the sealing washer 7 is still usable, and thus the service life of the ball valve is long.
[0025] The present utility model is suitable for use in a water supply system with relatively high water pressure. When the ball valve is closed, the pressure difference on both sides of the ball valve should be able to be maintained above 0.1 MPa. At present, the pressure requirement at the household end of municipal water supply is 0.15 - 0.35 MPa.
[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.
Claims
1. A wear-resistant brass ball valve, comprising a valve body (1), a flow channel (2) being arranged in the valve body (1), a ball cavity (3) being arranged in the middle of the valve body (1), a ball (4) being arranged in the ball cavity (3), a through hole (5) being arranged in the ball (4) and being coaxial with the flow channel (2), sealing gaskets (6, 7) being arranged on both sides of the ball (4), an annular mounting groove (8) being arranged on both sides of the ball cavity (3), the sealing gaskets (6, 7) being located in the mounting groove (8), characterized in that: The sealing gasket (6) close to the water outlet side of the flow channel (2) is tightly connected between the valve body (1) and the ball (4), and a pressure relief groove (18) is provided between the sealing gasket (6) and the ball (4). The sealing gasket (7) close to the water inlet side of the flow channel (2) is loosely connected between the valve body (1) and the ball (4), and the sealing gasket (7) can move axially under the action of an external force.
2. The wear-resistant brass ball valve according to claim 1, characterized in that: A rubber sleeve (9) is provided on the outer circumference of the sealing gasket (7), and an annular sealing sheet (10) is provided on the outer circumference of the rubber sleeve (9). The sealing sheet (10) is conical, and the outer ring of the sealing sheet (10) is inclined toward the water inlet side of the flow channel (2).
3. The wear-resistant brass ball valve according to claim 2, characterized in that: The rubber sleeve (9) is tightly connected to the sealing gasket (7).
4. The wear-resistant brass ball valve according to claim 2, characterized in that: There are three sealing sheets (10).
5. The wear-resistant brass ball valve according to claim 2, characterized in that: The outer end of the rubber sleeve (9) extends radially inward to form a flange ring (11) in contact with the outer end surface of the sealing gasket (7), and a gap of 0.3-1 mm is formed between the flange ring (11) and the bottom surface of the corresponding installation groove (8).