Pull ring sand prevention three-way valve

Abstract

The utility model provides a sand-proof three-way valve with a pull ring, and belongs to the technical field of valves. The technical problems that an existing pull ring sand-proof three-way valve is prone to water leakage, and a valve rod is not smooth enough in rotation are solved. A pull ring sand prevention three-way valve comprises an integrally-formed valve body and a valve element rotating relative to the valve body, a mounting cavity is formed in the valve body, the valve body is further provided with a first channel, a second channel and a third channel which are communicated with the mounting cavity, the mounting cavity is provided with a mounting opening, and the axis of the mounting opening is perpendicular to the first channel, the second channel and the third channel. The valve element is installed in the installation cavity through the installation opening and then fixed, a waterproof ring is tightly attached between the valve element and the installation cavity, the waterproof ring is fixedly located at the inner ends of the first channel, the second channel and the third channel, a first medium channel, a second medium channel and a third medium channel which are communicated with one another are formed in the valve element, and a sand prevention hole with an opening facing the valve body is further formed in the outer side of the valve element. The anti-sand-blocking valve is better in sealing effect, the handle rotates more smoothly, and the anti-sand-blocking effect is more obvious.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a pull-ring sand-proof three-way valve. Background Art

[0002] The three-way ball valve has a long service life, large flow capacity and small resistance. It is mainly used in pipelines to cut off, distribute and change the flow direction of the medium.

[0003] The three-way ball valve in the prior art generally includes a valve body, a ball core installed in the valve body, and a handle for controlling the ball core. The valve body has medium inlet and outlet channels, a connecting cavity for connecting the medium inlet and outlet channels, the ball core is arranged in the connecting cavity, and a sealing structure is arranged between the medium inlet and outlet channels and the ball core. However, since the medium contains a large amount of impurities, the impurities are easy to damage the valve seat and the sealing ring, which will cause internal leakage of the valve.

[0004] For example, the patent number is 2020202964252, which is a high-performance anti-sand ball valve. The ball valve is configured as a split structure of left and right valve bodies. The left and right valve bodies are connected to the valve cover. The ball is located in the cavity formed by the left and right valve bodies and the valve cover. A valve seat support is provided between the ball and the left and right valve bodies. A sealing ring is provided between the left and right valve bodies and the valve seat support. The valve seat support is provided with an annular groove. The annular groove is interference-fitted with the scraper, so that the contact part between the scraper and the ball is closer to the axis of the ball through-hole relative to the valve seat. The scraper is used to clean the spherical surface that contacts the spherical surface and prevent impurities from entering the valve seat position, thereby protecting the valve seat.

[0005] However, due to the split setting of the valve body and the large number of parts, it is difficult to control the center position of the ball after the ball valve is installed, which can easily cause the ball to shift during subsequent rotation. The three-way ball valve is prone to water leakage, and the deviation of the ball center may also affect the smoothness of the valve stem rotation. Summary of the invention

[0006] In view of the shortcomings of the prior art, the utility model aims to provide a pull-ring anti-sand three-way valve. The technical problem to be solved by the utility model is: how to make the installation structure of the three-way valve simple, the sealing effect better, and the anti-sand blocking effect more obvious.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a pull-ring anti-sand three-way valve, comprising an integrally formed valve body and a valve core rotating relative to the valve body, wherein the valve body is provided with an installation cavity, and the valve body is also provided with a first channel, a second channel and a third channel connected to the installation cavity, the installation cavity has an installation port, and the axis of the installation port is perpendicular to the first channel, the second channel and the third channel, the valve core is fixed after being installed in the installation cavity through the installation port, a waterproof ring is tightly fitted between the valve core and the installation cavity, and the waterproof ring is fixed at the inner ends of the first channel, the second channel and the third channel, the valve core is provided with a medium channel 1, a medium channel 2 and a medium channel 3 connected to each other, and the outer side of the valve core is also provided with a sand-proof hole opening toward the valve body.

[0008] The installation cavity in the valve body is an open installation cavity with an installation port. The waterproof ring and the valve body are preferably injection-molded together through a mold so that the waterproof ring is firmly fixed to the inner ends of the first channel, the second channel and the third channel. The valve core is installed by setting the installation port, and the other end of the waterproof ring is tightly fitted with the valve core. Since the waterproof ring is directly fixed to the inner ends of the first channel, the second channel and the third channel, the waterproof ring is prevented from moving and leaking. Moreover, since the valve body is integrally formed, a moderate gap is maintained between the valve core and the inner ends of the first channel, the second channel and the third channel to cooperate with the waterproof ring, so that the overall installation structure is simple and the sealing effect is better. The axis of the installation port is perpendicular to the first channel, the second channel and the third channel, so that the valve body is easier to demold and the valve core is more convenient to install. The integrally formed valve body and the valve core can better retain the rotation space of the sand prevention hole. The anti-sand hole works because the medium contains a lot of impurities. Some impurities will pass through the waterproof ring through the water flow and squeeze between the valve body and the valve core. If the impurities in the waterproof ring cannot be removed in time, the valve core will rotate relative to the waterproof ring for many times, which will cause the impurities to wear the waterproof ring, and the three-way valve will leak. After the anti-sand hole is set on the valve core, the impurities will pass through the waterproof ring through the water flow and will be squeezed into the anti-sand hole. When the anti-sand hole is rotated to connect with the first channel, the second channel or the third channel, the impurities will be taken away, which plays a good role in preventing sand blocking and can make the waterproof ring better seal. The anti-sand hole can be circular or other shapes.

[0009] Furthermore, the sand-proof hole, medium channel 1, medium channel 2 and medium channel 3 are distributed in a cross shape, the sand-proof hole is not connected to medium channel 1, medium channel 2 and medium channel 3, a valve stem is fixed on the valve core, the valve stem passes through the installation port and is fixedly connected to a handle, wherein the valve stem and the handle can be integrally formed with the valve core or separately formed.

[0010] The sand-proof hole on the valve core is not connected to the medium channel 1, medium channel 2 and medium channel 3. The sand-proof hole, medium channel 1, medium channel 2 and medium channel 3 are arranged in a cross shape to better distribute the angle of rotation of the valve core. The side of the valve core with the sand-proof hole can also block the first channel, the second channel or the third channel to close the medium from entering the channel. The valve stem passes through the installation port, and the axis of the valve stem is perpendicular to the sand-proof hole, medium channel 1, medium channel 2 and medium channel 3 and is located in the middle of the four, which can better rotate the valve core and distribute the medium.

[0011] Furthermore, the valve stem and the valve core are integrally formed, a fixing portion protrudes outward from the outer circumference of the valve stem, a positioning portion protrudes outward axially along the mounting port on the valve body, the fixing portion is rotatably embedded in the positioning portion, a fixing block protrudes inward from the inner circumference of the positioning portion, and the fixing portion is fixed by abutting and fitting with the fixing block.

[0012] The valve stem and the valve core are integrally formed so that the two maintain the same central axis, and an integral fixing portion is molded outward on the outer circumferential surface of the valve stem. An integral positioning portion protrudes outward along the axial direction of the installation port on the valve body. The positioning portion and the fixing portion have the same central axis. After the fixing portion is embedded in the positioning portion, it can rotate relative to the valve body around its own central axis. The fixing portion is prevented from axially falling off by a fixing block, but the circumferential rotation of the fixing portion is not restricted.

[0013] Furthermore, the fixing portion includes a first disc and a second disc in a stepped shape, the diameter of the first disc is larger than the diameter of the second disc, an annular groove is provided on the outer circumferential surface of the second disc, the upper side surface of the annular groove is the lower end surface of the first disc, the upper end surface of the first disc abuts against the lower end surface of the fixed block, an inclined guide surface is also provided between the lower end surface and the side surface of the first disc, and an annular gasket is provided between the annular groove and the positioning portion.

[0014] By providing an annular groove and using the upper side of the annular groove as the lower end face of the first disc, the first disc has a certain elastic deformation, and the inclined guide surface can better install the fixing part. The annular gasket can play two major roles of sealing and supporting, so that the fixing part is sealed and can support the circumferential rotation of the fixing part.

[0015] Furthermore, a first positioning block protrudes from the side wall of the valve body opposite to the second channel, the first positioning block and the three waterproof rings are in contact with the valve core, and the valve core is not in contact with the bottom of the valve body.

[0016] The waterproof rings are all located at the inner ends of the first channel, the second channel, and the third channel. The first positioning block and the three waterproof rings can contact the valve core to balance the force on the valve core, keep the central axis rotating, and achieve better sealing effect. The first positioning block and the three waterproof rings are located on the side of the valve core, and the valve core is clamped from the sides in four directions to keep a gap between the bottom of the valve core and the bottom of the valve body, so that the valve core can rotate better.

[0017] Furthermore, the first positioning block has a semicircular portion matching the valve core, the axis of the semicircular portion is consistent with the axis of the second channel, the semicircular portion is located below the center of the valve core, and the end of the semicircular portion that contacts the valve core has an arc surface.

[0018] The semicircular portion is arranged to be consistent with the axis of the second channel, that is, to be consistent with the axis of the waterproof ring fixed at the inner end of the second channel. Then the semicircular portion and the other three waterproof rings can stabilize the center of the valve core and rotate more smoothly.

[0019] Furthermore, a second positioning block protrudes from the side wall of the valve body opposite to the second channel, the second positioning block is located above the semicircular portion, and the second positioning block can interfere with the valve core.

[0020] In order to make the three waterproof rings contact the valve core better, a second positioning block is set. The second positioning block and the first positioning block are arranged up and down, and the semicircular part on the first positioning block cooperates with the three waterproof rings to form a valve core with balanced force in the up, down, left and right directions, so that the sealing effect of the waterproof ring on the valve core is better.

[0021] Furthermore, the valve stem is fixed to the valve core via a fixing member. The valve stem can be separately provided with a handle.

[0022] Furthermore, a movable snap ring is sleeved on the first channel, the second channel and / or the third channel, and a limit block is set at the outer end of the first channel, the second channel and / or the third channel, and the limit block can prevent the snap ring from falling. Bringing your own snap ring can reduce the customer's cost, shorten the installation time and improve work efficiency.

[0023] Furthermore, the first channel, the second channel and the third channel are arranged in an inclined expansion shape from the inside to the outside, and the outer peripheral surface of the clamp ring has a plurality of protruding anti-sliding blocks. The inclined expansion shape can better cooperate with the clamp ring to fix the water pipe, and the anti-sliding blocks can facilitate the rotation of the clamp ring.

[0024] Compared with the prior art, the technical effects of the utility model are as follows: the valve body is integrally formed, so that the valve core and the inner ends of the first channel, the second channel and the third channel are all kept with a moderate gap and the waterproof ring, so that the overall installation structure is simple and the sealing effect is better; the installation port that can freely place the valve core is set, which can better help the valve body demoulding and can also use the mold to make the valve body retain the position for the anti-sand hole to rotate. The valve core, the valve stem and the handle can be integrally formed, and the fixed part is integrally formed, which is conducive to reducing the mold and can also ensure that the rotation of the valve core, the valve stem and the handle has the same axis; the first positioning block and the second positioning block are arranged up and down, and the semicircular part on the first positioning block cooperates with the three waterproof rings to interact to form a valve core that is balanced in the up, down, left and right directions, so that the waterproof ring has a better sealing effect on the valve core; the first positioning block and the three waterproof rings are located on the side of the valve core, and the valve core is clamped from the side of the four directions to keep the gap between the bottom of the valve core and the bottom of the valve body, so that the valve core can rotate better; the self-contained clamping ring can reduce the cost of customers, facilitate customers to shorten the installation time and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The utility model is a cross-sectional view Figure 1 .

[0026] Figure 2 The utility model is a cross-sectional view Figure 2 .

[0027] Figure 3 It is a stereogram of the utility model.

[0028] Figure 4 The utility model is a cross-sectional view Figure 3 .

[0029] Figure 5 It is an exploded view of the utility model.

[0030] Figure 6 It is a connection diagram of a three-way valve of the utility model.

[0031] Figure number marking: 1, valve body; 11, installation cavity; 12, first channel; 13, second channel; 14, third channel; 15, installation port; 16, valve stem; 1601, fixing part; 1601a, first disc; 1601b, second disc; 1601c, annular groove; 1601d, inclined guide surface; 17, handle; 18, positioning part; 1801, fixing block; 19, first positioning block; 1901, semicircular part; 210, second positioning block; 211, limit block;

[0032] 2. Valve core; 21. Medium channel 1; 22. Medium channel 2; 23. Medium channel 3; 24. Anti-sand hole;

[0033] 3. Waterproof ring;

[0034] 4. Snap ring; 401. Anti-sliding block;

[0035] 5. Water pipes; DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] It should be noted that the descriptions of the present invention regarding directions such as "up", "down", "left", "right", "top" and "bottom" are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0038] according to Figures 1 to 5 As shown, a pull-ring anti-sand three-way valve comprises a valve body 1 and a valve core 2. The valve body 1 is integrally formed by injection molding. The valve body 1 has an installation cavity 11. The valve core 2 is located in the valve body 1 and rotates relative to the valve body 1. The valve body 1 also has a first channel 12, a second channel 13 and a third channel 14 connected to the installation cavity 11. The installation cavity 11 has an installation port 15. The diameter of the installation port 15 is larger than the diameter of the valve core 2. The installation port 15 is integrally connected to the installation cavity 11. It is particularly important to highlight that the installation port 15 is a part of the installation cavity 11. The axis of the installation port 15 is perpendicular to the first channel 12, the second channel 13 and the third channel 14. The valve core 2 is fixed after being installed in the installation cavity 11 through the installation port 15, and a waterproof ring 3 is tightly fitted between the valve core 2 and the installation cavity 11. The waterproof ring 3 is fixed at the inner ends of the first channel 12, the second channel 13 and the third channel 14. The valve core 2 has a medium channel 1 21, a medium channel 2 22 and a medium channel 3 23 that are interconnected. The outer side of the valve core 2 also has a sand-proof hole 24 that opens toward the valve body 1. During the rotation of the valve core 2, the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23 will be connected to the first channel 12, the second channel 13 and the third channel 14 respectively. Similarly, the sand-proof hole 24 will also block the first channel 12, the second channel 13 or the third channel 14 during the rotation process to form a closable three-way valve. The passage of the three-way valve can be a one-in and two-out or two-in and one-out medium in and out mode.

[0039] The waterproof ring 3 can be injection molded together with the valve body 1 through a mold, so that the waterproof ring 3 is firmly fixed at the inner ends of the first channel 12, the second channel 13 and the third channel 14; or the waterproof ring 3 can be subsequently installed and embedded in the valve body 1. The valve core 2 is installed from the installation port 15, and the waterproof ring 3 is tightly fitted between the valve core 2 and the inner ends of the first channel 12, the second channel 13 and the third channel 14. Since the valve body 1 is integrally formed, the valve core 2 and the inner ends of the first channel 12, the second channel 13 and the third channel 14 are kept with a moderate gap to cooperate with the waterproof ring 3, so that the overall installation structure is simple and the sealing effect is better; the axis of the installation port 15 is perpendicular to the first channel 12, the second channel 13 and the third channel 14, so that the valve body 1 is easier to demold and the valve core 2 is more convenient to install. Since the valve core 2 can be installed in the installation port 15, the rotation space of the sand-proof hole 24 can be better retained when passing through the mold. The anti-sand hole 24 works because the medium contains a lot of impurities, some of which will be squeezed between the valve body 1 and the valve core 2 through the water flow over the waterproof ring 3. If the impurities in the waterproof ring 3 cannot be removed in time, the valve core 2 will rotate relative to the waterproof ring 3 for many times, which will cause the impurities to wear the waterproof ring 3, and the three-way valve will leak. After the anti-sand hole 24 is set on the valve core 2, the impurities will be squeezed into the anti-sand hole 24 after passing through the waterproof ring 3 through the water flow. When the anti-sand hole 24 is rotated to connect with one of the first channel 12, the second channel 13 or the third channel 14, the impurities will be taken away, which plays a good role in preventing sand blocking and can make the waterproof ring 3 better seal. The anti-sand hole 24 can be round, square or other shapes.

[0040] It is preferred that the anti-sand hole 24, the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23 are distributed in a cross shape, and the anti-sand hole 24 is not connected with the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23. A valve stem 16 is fixed on the valve core 2, and the valve stem 16 passes through the installation port 15 and is fixedly connected with a handle 17. The valve stem 16 and the handle 17 can be integrally formed with the valve core 2 or separately formed. The anti-sand hole 24 on the valve core 2 is not connected with the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23. The anti-sand hole 24, the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23 are distributed in a cross shape to better distribute the rotation angle of the valve core 2. The side of the valve core 2 with the anti-sand hole 24 can also block the first channel 12 or the second channel 13 or the third channel 14 to close the medium entering the channel. The valve stem 16 passes through the installation opening 15, and the axis of the valve stem 16 is perpendicular to the sand-proof hole 24, the medium channel 1 21, the medium channel 2 22 and the medium channel 3 23 and is located in the middle of the four, which can better rotate the valve core 2 and distribute the medium.

[0041] It is preferred that the valve body 1, the valve stem 16 and the handle 17 are integrally formed. The valve stem 16 and the valve core 2 are integrally formed so that the two maintain the same central axis. A fixing portion 1601 protrudes outward from the outer circumference of the valve stem 16. A positioning portion 18 protrudes outward axially along the mounting opening 15 on the valve body 1. The fixing portion 1601 is rotatably embedded in the positioning portion 18. A fixing block 1801 protrudes inward from the inner circumference of the positioning portion 18. The fixing portion 1601 is fixed by abutting against the fixing block 1801. After the fixing portion 1601 is embedded in the positioning portion 18, it can rotate relative to the valve body 1 around its own central axis. The fixing block 1801 prevents the fixing portion 1601 from axially falling off, but does not restrict the fixing portion 1601 from rotating circumferentially.

[0042] The fixing part 1601 includes a first disc 1601a and a second disc 1601b in a stepped shape. The diameter of the first disc 1601a is larger than that of the second disc 1601b. An annular groove 1601c is provided on the outer circumference of the second disc 1601b. In order to allow the first disc 1601a to have a certain elastic deformation, the upper side surface of the annular groove 1601c is set as the lower end surface of the first disc 1601a. ​​The upper end surface of the first disc 1601a is against the lower end surface of the fixing block 1801. An inclined guide surface 1601d is further provided between the lower end surface and the side surface of the first disc 1601a. ​​An annular gasket is provided between the annular groove 1601c and the positioning part 1818.

[0043] The waterproof rings 3 are all located at the inner ends of the first channel 12, the second channel 13 and the third channel 14. A first positioning block 19 is protruded on the side wall of the valve body 1 opposite to the second channel 13. The first positioning block 19 and the three waterproof rings 3 are in contact with the valve core 2 to balance the force on the valve core 2, keep the central axis rotating, and achieve better sealing effect. The first positioning block 19 and the three waterproof rings 3 are located on the side of the valve core 2, and the valve core 2 is clamped from the sides in four directions to keep a gap between the bottom of the valve core 2 and the bottom of the valve body 1. The valve core 2 does not contact the bottom of the valve body 1, which allows the valve core 2 to rotate better.

[0044] The first positioning block 19 has a semicircular portion 1901 that matches the valve core 2. The axis of the semicircular portion 1901 is consistent with the axis of the second channel 13. The semicircular portion 1901 is located below the center of the valve core 2. The end of the semicircular portion 1901 that contacts the valve core 2 has an arc surface. The semicircular portion 1901 and the other three waterproof rings 3 can stabilize the center of the valve core 2 and rotate more smoothly.

[0045] In order to make the three waterproof rings 3 better contact with the valve core 2, a second positioning block 210 is protruded on the side wall of the valve body 1 opposite to the second channel 13. The second positioning block 210 is located above the semicircular portion 1901, and the second positioning block 210 can contact the valve core 2. The second positioning block 210 and the first positioning block 19 are arranged up and down, and the semicircular portion 1901 on the first positioning block 19 cooperates with the three waterproof rings 3 to form a valve core 2 with balanced force in the up, down, left and right directions, so that the sealing effect of the waterproof ring 3 on the valve core 2 is better.

[0046] The valve stem 16 is fixed to the valve core 2 via a fixing member. The valve stem 16, the valve core 2 and the handle 17 can all be separately arranged and fixed via a fixing member, and the fixing member can be a fixing bolt or the like.

[0047] according to Figure 6 As shown, a movable snap ring 4 is sleeved on the first channel 12, the second channel 13 and / or the third channel 14, and a limit block 211 is set at the outer end of the first channel 12, the second channel 13 and / or the third channel 14, and the limit block 211 can prevent the snap ring 4 from falling. The first channel 12, the second channel 13 and the third channel 14 are arranged in an inclined flared shape from the inside to the outside, and the outer peripheral surface of the snap ring 4 has a plurality of protruding anti-slip blocks 401. The inclined flared shape can better cooperate with the snap ring 4 to fix the water pipe 5, and the anti-slip block 401 can facilitate the rotation of the snap ring 4; the self-provided snap ring 4 can reduce the customer's cost, and it is convenient for the customer to shorten the installation time and improve the work efficiency.

[0048] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A pull-ring anti-sand three-way valve, comprising an integrally formed valve body (1) and a valve core (2) rotating relative to the valve body (1), wherein the valve body (1) has an installation cavity (11), and the valve body (1) also has a first channel (12), a second channel (13) and a third channel (14) communicating with the installation cavity (11), characterized in that: The installation cavity (11) has an installation opening (15), the axis of which is perpendicular to the first channel (12), the second channel (13) and the third channel (14); the valve core (2) is fixed after being installed into the installation cavity (11) through the installation opening (15); a waterproof ring (3) is tightly fitted between the valve core (2) and the installation cavity (11); the waterproof ring (3) is fixedly located at the inner ends of the first channel (12), the second channel (13) and the third channel (14); the valve core (2) has a first medium channel (21), a second medium channel (22) and a third medium channel (23) which are interconnected; and the outer side of the valve core (2) also has a sand-proof hole (24) which opens toward the valve body (1).

2. A pull-ring anti-sand three-way valve according to claim 1, characterized in that: The anti-sand hole (24), the medium channel one (21), the medium channel two (22) and the medium channel three (23) are arranged in a cross shape, the anti-sand hole (24) is not connected with the medium channel one (21), the medium channel two (22) and the medium channel three (23), a valve stem (16) is fixed on the valve core (2), the valve stem (16) passes through the installation opening (15) and is fixedly connected with a handle (17).

3. The pull-ring anti-sand three-way valve according to claim 2, characterized in that: The valve stem (16) and the valve core (2) are integrally formed, and a fixing portion (1601) protrudes outward from the outer circumference of the valve stem (16), and a positioning portion (18) protrudes axially outward along the mounting opening (15) on the valve body (1), and the fixing portion (1601) is rotatably embedded in the positioning portion (18), and a fixing block (1801) protrudes inward from the inner circumference of the positioning portion (18), and the fixing portion (1601) and the fixing block (1801) are fixed by abutting and fitting against each other.

4. The pull-ring anti-sand three-way valve according to claim 3, characterized in that: The fixing portion (1601) comprises a first disc (1601a) and a second disc (1601b) in a stepped shape, the diameter of the first disc (1601a) being larger than the diameter of the second disc (1601b), an annular groove (1601c) being provided on the outer circumferential surface of the second disc (1601b), the upper side surface of the annular groove (1601c) being the lower end surface of the first disc (1601a), the upper end surface of the first disc (1601a) being abutted against the lower end surface of the fixing block (1801), an inclined guide surface (1601d) being further provided between the lower end surface and the side surface of the first disc (1601a), and an annular gasket being provided between the annular groove (1601c) and the positioning portion (18).

5. A pull-ring anti-sand three-way valve according to any one of claims 1 to 4, characterized in that: A first positioning block (19) protrudes from the side wall of the valve body (1) opposite to the second channel (13); the first positioning block (19) and the three waterproof rings (3) are in contact with the valve core (2); and the valve core (2) is not in contact with the bottom of the valve body (1).

6. The pull-ring anti-sand three-way valve according to claim 5, characterized in that: The first positioning block (19) has a semicircular portion (1901) matching the valve core (2), the axis of the semicircular portion (1901) is consistent with the axis of the second channel (13), the semicircular portion (1901) is located below the center of the valve core (2), and the end of the semicircular portion (1901) that contacts the valve core (2) has an arc surface.

7. The pull-ring anti-sand three-way valve according to claim 6, characterized in that: A second positioning block (210) protrudes from the side wall of the valve body (1) opposite to the second channel (13); the second positioning block (210) is located above the semicircular portion (1901); and the second positioning block (210) can contact the valve core (2).

8. The pull-ring anti-sand three-way valve according to claim 2, characterized in that: The valve stem (16) is fixed to the valve core (2) via a fixing member.

9. The pull-ring anti-sand three-way valve according to claim 1, characterized in that: A movable snap ring (4) is sleeved on the first channel (12), the second channel (13) and / or the third channel (14); a limit block (211) is provided at the outer end of the first channel (12), the second channel (13) and / or the third channel (14); the limit block (211) can prevent the snap ring (4) from falling.

10. The pull-ring anti-sand three-way valve according to claim 9, characterized in that: The first channel (12), the second channel (13) and the third channel (14) are arranged in an inclined expansion shape from the inside to the outside, and the outer peripheral surface of the clamping ring (4) has a plurality of protruding anti-sliding blocks (401).

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