Flange cast steel gate valve

Abstract

The utility model provides a flange cast steel gate valve which comprises a valve body and a valve cover arranged at the top of the valve body, a flow channel is arranged at the center of the valve body in a penetrating mode, an installation opening is formed in the top of the valve body and communicated with the flow channel, a valve rod is arranged in the valve cover, a valve element is arranged at the bottom of the valve rod, and the valve element penetrates through the installation opening and extends into the flow channel. The valve body is provided with a mounting opening, the mounting opening is flared, two first sealing rings are arranged in the mounting opening and symmetrically distributed on the two sides of the valve element, the width of the valve element is gradually reduced from the side of the valve deck to the side of the valve body, second sealing rings are arranged on the two sides of the valve element, and when the valve element partitions the flow channel, the second sealing rings abut against the first sealing rings on the same sides. When an operator controls the valve element to move towards one side of the valve deck through the valve rod, the second sealing ring is separated from the first sealing ring, so that the first sealing ring and the second sealing ring are not prone to abrasion, and the service life is long.

Description

Technical Field

[0001] The utility model relates to a gate valve, in particular to a flange cast steel gate valve. Background Art

[0002] At present, a Chinese patent with the announcement number CN218761507U discloses a gate valve for shock absorption and leakage prevention during oil transportation, including a main body module and a sealing module. The main body module includes a pipeline, flanges symmetrically fixed at both ends of the pipeline, a valve stem installed in the inner cavity of the pipeline and extending out of the pipeline, a hand wheel rotatably installed at the top of the pipeline, and a gate installed at the bottom end of the valve stem. The sealing module includes a first sealing ring installed on the inner wall of the pipeline, a fixed plate fixedly sleeved on the valve stem, a second sealing ring installed at the bottom end of the fixed plate, a sealing assembly installed on the inner wall of the pipeline, and an extrusion assembly installed at the bottom end of the valve plate. However, when the gate plate of the above-mentioned gate valve slides inside the pipeline, the gate plate and the first sealing ring continue to rub, which will have a significant impact on the service life of the first sealing ring. Summary of the invention

[0003] In view of this, the utility model aims to provide a flange cast steel gate valve, which has the advantage of a longer service life of the sealing member.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a flange cast steel gate valve, comprising a valve body, a valve cover arranged on the top of the valve body, a flow channel is arranged through the center of the valve body, a mounting opening is opened on the top of the valve body, the mounting opening is connected with the flow channel, a valve stem is arranged in the valve cover, a valve core is arranged at the bottom of the valve stem, the valve core passes through the mounting opening and extends into the flow channel, the mounting opening is flared, two first sealing rings are arranged in the mounting opening, and the two first sealing rings are symmetrically distributed on both sides of the valve core, the width of the valve core gradually decreases from the valve cover side to the valve body side, second sealing rings are arranged on both sides of the valve core, and when the valve core blocks the flow channel, the second sealing ring is tightly pressed against the first sealing ring on the same side.

[0005] Through the above technical solution, the installation opening is expanded, so the first sealing ring arranged on the inner wall of the installation opening will be inclined, and the distance between the two first sealing rings will gradually decrease from the valve cover side to the valve body side. The width of the valve core gradually decreases from the valve cover side to the valve body side, so the second sealing ring arranged on the side wall of the valve core is inclined, and the distance between the two second sealing rings will gradually decrease from the valve cover side to the valve body side.

[0006] When the gate valve is in a closed state, the second sealing ring is pressed against the first sealing ring to seal the gap between the valve core and the valve body. When the operator controls the valve core to move toward the valve cover through the valve stem, the second sealing ring is separated from the first sealing ring, so that the first sealing ring and the second sealing ring are not easy to wear and have the advantage of a long service life.

[0007] Preferably, a first positioning groove is formed on the inner wall of the installation opening opposite to the first sealing ring, and the first sealing ring is embedded in the corresponding first positioning groove.

[0008] Through the above technical solution, the inner groove wall of the first positioning groove can be used to limit the first sealing ring, so that the first sealing ring is not easily displaced during use, which helps to improve the connection strength between the first sealing ring and the valve body.

[0009] Preferably, a first limiting ring groove is formed on the inner wall of the first positioning groove, the first limiting ring groove extends along the circumference of the first positioning groove, and a first limiting convex ring is provided on the outer wall of the first sealing ring, and the first limiting convex ring is embedded in the first limiting ring groove.

[0010] Through the above technical solution, the first limiting ring groove cooperates with the first limiting convex ring to further limit the first sealing ring, so that the first sealing ring is not easy to fall out of the first positioning groove, which helps to improve the connection strength between the first sealing ring and the valve body.

[0011] Preferably, the groove width of the first limiting ring groove gradually decreases from a side close to the valve core to a side away from the valve core, and the shape of the first limiting convex ring is adapted to the shape of the first limiting ring groove.

[0012] Through the above technical solution, the first limiting protrusion ring arranged in this way can be inserted into the first limiting ring groove more conveniently.

[0013] Preferably, a second positioning groove is formed on the outer wall of the valve core opposite to the second sealing ring, and the second sealing ring is embedded in the corresponding second positioning groove.

[0014] Through the above technical solution, the inner groove wall of the second positioning groove can be used to limit the second sealing ring, so that the second sealing ring is not easily displaced during use, which helps to improve the connection strength between the second sealing ring and the valve core.

[0015] Preferably, a second limiting ring groove is formed on the inner wall of the second positioning groove, the second limiting ring groove extends along the circumference of the second positioning groove, and a second limiting convex ring is provided on the outer wall of the second sealing ring, and the second limiting convex ring is embedded in the second limiting ring groove.

[0016] Through the above technical solution, the second limiting ring groove cooperates with the second limiting convex ring to further limit the second sealing ring, so that the second sealing ring is not easy to fall out of the second positioning groove, which helps to further improve the connection strength between the second sealing ring and the valve core.

[0017] Preferably, the groove width of the second limiting ring groove gradually decreases from the side away from the valve stem to the side close to the valve stem, and the shape of the second limiting convex ring is adapted to the shape of the second limiting ring groove.

[0018] Through the above technical solution, the second limiting protrusion ring arranged in this way can be inserted into the second limiting ring groove more conveniently.

[0019] Preferably, an extended flange is provided on the outer wall of the second sealing ring, and the extended flange is in close contact with the valve core.

[0020] Through the above technical solution, the extended flange is in close contact with the valve core, which can effectively increase the contact area between the second sealing ring and the valve core, thereby further improving the connection strength between the second sealing ring and the valve core.

[0021] Preferably, a plurality of countersunk holes are provided on the extended flange, and the plurality of countersunk holes are evenly distributed along the circumference of the extended flange, and a connecting screw is provided in each of the countersunk holes, and the threaded section of the connecting screw is threadably connected to the valve core to press and fix the extended flange to the valve core.

[0022] Through the above technical solution, the extended flange is pressed and fixed to the valve core by connecting screws, which can further improve the connection strength between the extended flange and the second sealing ring and the valve core. A plurality of connecting screws are evenly distributed along the axial direction of the extended flange, which can be used to limit the circumferential rotation of the extended flange and the second sealing ring.

[0023] Preferably, a movable groove is formed on the head of the connecting screw, the movable groove is configured to be constricted, a ball is clamped in the movable groove, and the ball is accommodated in the movable groove.

[0024] Through the above technical solution, when the second sealing ring is greatly worn, the ball can contact with the first sealing ring, thereby reducing the friction with the first sealing ring, so that the movement of the valve core becomes smoother and faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment;

[0026] Figure 2 for Figure 1 Enlarged view of part A.

[0027] Figure numerals: 1. valve body; 2. valve cover; 3. flow channel; 4. installation opening; 5. valve stem; 6. valve core; 7. first sealing ring; 8. second sealing ring; 9. first positioning groove; 10. first limiting ring groove; 11. first limiting convex ring; 12. second positioning groove; 13. second limiting ring groove; 14. second limiting convex ring; 15. extended flange; 16. countersunk hole; 17. connecting screw; 18. movable groove; 19. ball. Implementation

[0028] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0029] A flange cast steel gate valve, such as Figure 1 , Figure 2 As shown, it includes a valve body 1 and a valve cover 2 arranged on the top of the valve body 1.

[0030] A flow channel 3 is provided through the center of the valve body 1, and a mounting opening 4 is provided at the top of the valve body 1, which is connected to the flow channel 3. A valve stem 5 is provided in the valve cover 2, and a valve core 6 is provided at the bottom of the valve stem 5, which passes through the mounting opening 4 and extends into the flow channel 3.

[0031] The installation opening 4 is expanded, and two first sealing rings 7 are arranged in the installation opening 4, and the two first sealing rings 7 are symmetrically distributed on both sides of the valve core 6. The width of the valve core 6 gradually decreases from the valve cover 2 side to the valve body 1 side, and second sealing rings 8 are arranged on both sides of the valve core 6. When the valve core 6 blocks the flow channel 3, the second sealing ring 8 is tightly pressed against the first sealing ring 7 on the same side.

[0032] A first positioning groove 9 is provided at the inner wall of the installation opening 4 opposite to the first sealing ring 7, and the first sealing ring 7 is embedded in the corresponding first positioning groove 9. A first limiting ring groove 10 is provided at the inner wall of the first positioning groove 9, and the first limiting ring groove 10 extends along the circumference of the first positioning groove 9. A first limiting convex ring 11 is provided at the outer wall of the first sealing ring 7, and the first limiting convex ring 11 is embedded in the first limiting ring groove 10. The groove width of the first limiting ring groove 10 gradually decreases from the side close to the valve core 6 to the side away from the valve core 6, and the shape of the first limiting convex ring 11 is adapted to the shape of the first limiting ring groove 10.

[0033] A second positioning groove 12 is provided at the outer wall of the valve core 6 at a position opposite to the second sealing ring 8, and the second sealing ring 8 is embedded in the corresponding second positioning groove 12. A second limiting ring groove 13 is provided at the inner wall of the second positioning groove 12, and the second limiting ring groove 13 extends along the circumference of the second positioning groove 12. A second limiting convex ring 14 is provided at the outer wall of the second sealing ring 8, and the second limiting convex ring 14 is embedded in the second limiting ring groove 13. The groove width of the second limiting ring groove 13 gradually decreases from the side away from the valve stem 5 to the side close to the valve stem 5, and the shape of the second limiting convex ring 14 is adapted to the shape of the second limiting ring groove 13.

[0034] An extended flange 15 is provided at the outer wall of the second sealing ring 8, and the extended flange 15 is in close contact with the valve core 6. A plurality of countersunk holes 16 are provided on the extended flange 15, and the plurality of countersunk holes 16 are evenly distributed along the circumference of the extended flange 15, and a connecting screw 17 is provided in each countersunk hole 16, and the threaded section of the connecting screw 17 is threadedly connected to the valve core 6, so as to press and fix the extended flange 15 to the valve core 6. A movable groove 18 is provided at the head of the connecting screw 17, and the movable groove 18 is configured in a constricted manner, and a ball 19 is clamped in the movable groove 18, and the ball 19 is accommodated in the movable groove 18.

[0035] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A flange cast steel gate valve, comprising a valve body (1), a valve cover (2) arranged on the top of the valve body (1), a flow channel (3) penetrating the center of the valve body (1), a mounting opening (4) opened on the top of the valve body (1), the mounting opening (4) being communicated with the flow channel (3), a valve stem (5) being arranged in the valve cover (2), a valve core (6) being arranged at the bottom of the valve stem (5), the valve core (6) passing through the mounting opening (4) and extending into the flow channel (3), wherein: The installation opening (4) is flared, and two first sealing rings (7) are arranged in the installation opening (4), and the two first sealing rings (7) are symmetrically distributed on both sides of the valve core (6), and the width of the valve core (6) gradually decreases from the valve cover (2) side to the valve body (1) side. Second sealing rings (8) are arranged on both sides of the valve core (6), and when the valve core (6) blocks the flow channel (3), the second sealing ring (8) is tightly pressed against the first sealing ring (7) on the same side.

2. A flange cast steel gate valve according to claim 1, characterized in that: A first positioning groove (9) is provided on the inner wall of the installation opening (4) opposite to the first sealing ring (7), and the first sealing ring (7) is embedded in the corresponding first positioning groove (9).

3. A flange cast steel gate valve according to claim 2, characterized in that: A first limiting ring groove (10) is provided on the inner wall of the first positioning groove (9), and the first limiting ring groove (10) extends along the circumference of the first positioning groove (9). A first limiting convex ring (11) is provided on the outer wall of the first sealing ring (7), and the first limiting convex ring (11) is embedded in the first limiting ring groove (10).

4. A flange cast steel gate valve according to claim 3, characterized in that: The groove width of the first limiting ring groove (10) gradually decreases from the side close to the valve core (6) to the side away from the valve core (6), and the shape of the first limiting convex ring (11) is compatible with the shape of the first limiting ring groove (10).

5. A flange cast steel gate valve according to claim 1, characterized in that: A second positioning groove (12) is provided on the outer wall of the valve core (6) at a position opposite to the second sealing ring (8), and the second sealing ring (8) is embedded in the corresponding second positioning groove (12).

6. A flange cast steel gate valve according to claim 5, characterized in that: A second limiting ring groove (13) is provided on the inner wall of the second positioning groove (12), and the second limiting ring groove (13) extends along the circumference of the second positioning groove (12). A second limiting convex ring (14) is provided on the outer wall of the second sealing ring (8), and the second limiting convex ring (14) is embedded in the second limiting ring groove (13).

7. A flange cast steel gate valve according to claim 6, characterized in that: The groove width of the second limiting ring groove (13) gradually decreases from the side away from the valve stem (5) to the side close to the valve stem (5), and the shape of the second limiting convex ring (14) is compatible with the shape of the second limiting ring groove (13).

8. The flange cast steel gate valve according to claim 1 is characterized in that: An extended flange (15) is provided on the outer wall of the second sealing ring (8), and the extended flange (15) is tightly attached to the valve core (6).

9. A flange cast steel gate valve according to claim 8, characterized in that: The extended flange (15) is provided with a plurality of countersunk holes (16), and the plurality of countersunk holes (16) are evenly distributed along the circumference of the extended flange (15), and a connecting screw (17) is provided in each of the countersunk holes (16), and the threaded section of the connecting screw (17) is threadedly connected to the valve core (6) for pressing and fixing the extended flange (15) to the valve core (6).

10. A flange cast steel gate valve according to claim 9, characterized in that: The head of the connecting screw (17) is provided with a movable groove (18), the movable groove (18) is configured to be constricted, a ball (19) is clamped in the movable groove (18), and the ball (19) is received in the movable groove (18).

Images