PPR (pentatricopeptide repeats) plastic pipeline hard sealing stop valve

Abstract

The utility model relates to the technical field of stop valves, and discloses a PPR plastic pipeline hard sealing stop valve which comprises a PPR plastic structure, the upper end of the PPR plastic structure is in threaded connection with a valve shell, a hexagonal opening is formed in the bottom end of the valve shell, a hexagonal prism is arranged in the hexagonal opening, a trapezoidal threaded groove is formed in the upper end of the hexagonal prism, and a valve rod is arranged in the trapezoidal threaded groove. A plug is arranged at the bottom of the hexagonal prism, a rotatable valve rod is arranged in the valve shell, a trapezoidal thread strip is arranged at the bottom end of the valve rod, a trapezoidal thread groove is in threaded connection fit with the trapezoidal thread strip, and a convenient switching mechanism is arranged at the upper end of the valve rod and used for improving the sealing performance of the device. The valve shell is matched with the plug, the trapezoidal thread strip and the trapezoidal thread groove on the lower portion of the valve rod are matched with each other, the plug moves up and down for sealing, the plug is made of all metal, firmness, good sealing and long service life can be achieved even after long-time washing, and the problem of water leakage is solved.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a PPR plastic pipe hard seal gate valve. Background Technology

[0002] A gate valve is a commonly used valve, primarily used to control the flow of fluid in pipelines. Its name comes from its function: to cut off the flow of fluid. Opening and closing are achieved by raising and lowering a plug. Rotating the handwheel turns the valve stem, causing the plug to descend and contact the sealing surface of the valve body. As the plug continues to descend, the pressure between the sealing surfaces gradually increases, eventually achieving a tight seal and stopping the flow of fluid.

[0003] A PPR plastic pipe hard-seal gate valve is a gate valve installed in a PPR plastic pipe system. It combines the advantages of PPR pipe material with the functions of a hard-seal gate valve, and is used to precisely control the flow, cut-off, and flow regulation of fluid in PPR pipes.

[0004] In existing PPR plastic pipe hard-seal gate valves, the valve body provides a flow channel for fluid and withstands the pressure of the fluid inside the pipe. The plug moves up and down by the valve stem, which converts the rotational motion of the handwheel into the linear motion of the plug. The handwheel is used to control the opening and closing of the valve. Gate valves have both soft and hard sealing methods. However, in soft-seal gate valves, the rubber is prone to aging and falling off under long-term water erosion and immersion, leading to leakage problems and a short service life. Although existing technologies have strengthened the valves by replacing the material, prolonged use will still cause the rubber to age and fall off under long-term water erosion and immersion, resulting in leakage problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a PPR plastic pipe hard seal shut-off valve, which aims to improve the problem in the prior art that the rubber is prone to aging and falling off under long-term water flow and immersion, resulting in water leakage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a PPR plastic pipe hard-seal shut-off valve, comprising a PPR plastic structure, a valve body threadedly connected to the upper end of the PPR plastic structure, a hexagonal opening at the bottom end of the valve body, a hexagonal post inside the hexagonal opening, a trapezoidal threaded groove inside the upper end of the hexagonal post, a plug below the hexagonal post, a rotatable valve stem inside the valve body, a trapezoidal threaded strip at the bottom end of the valve stem, the trapezoidal threaded groove and the trapezoidal threaded strip being threadedly connected, and a convenient switching mechanism at the upper end of the valve stem, the convenient switching mechanism being used to increase the sealing performance of the device.

[0007] As a further description of the above technical solution:

[0008] The convenient switch mechanism includes a square bar, which is disposed at the upper end of the valve stem. A threaded post is provided at the top of the valve stem. A handwheel is fixedly connected to the outer wall of the square bar. A metal washer is provided at the upper end of the handwheel. A nut is threadedly connected to the outer wall of the threaded post.

[0009] As a further description of the above technical solution:

[0010] A water inlet channel is provided at the left end of the PPR plastic structure.

[0011] As a further description of the above technical solution:

[0012] A water outlet channel is provided at the right end of the PPR plastic structure.

[0013] As a further description of the above technical solution:

[0014] An inner thread insert is fixedly connected to the upper end of the PPR plastic structure.

[0015] As a further description of the above technical solution:

[0016] A sealing ring is slidably connected to the outer wall of the valve housing.

[0017] As a further description of the above technical solution:

[0018] The plug 13 is made of copper alloy and has a nickel-plated outer surface. Its shape includes, but is not limited to, spherical, conical, and arc surfaces.

[0019] As a further description of the above technical solution:

[0020] A second sealing ring is slidably connected to the upper end of the valve stem.

[0021] As a further description of the above technical solution:

[0022] The upper middle part of the valve stem is slidably connected with a sealing ring three.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, the valve body and the plug cooperate with each other, and the trapezoidal threaded strip and trapezoidal threaded groove under the valve stem cooperate with each other to make the plug move up and down to seal. The plug is made of all metal, which can achieve a firm seal even after long-term flushing and has a long service life. It solves the problem that the rubber of soft-seal gate valve is prone to aging and falling off under long-term water flushing and soaking, resulting in water leakage.

[0025] 2. In this utility model, the pressure of the device is increased by using a handwheel and a metal washer, and it is fixed by a threaded column and a nut, which increases the sealing performance of the device and solves the problem that the seal gradually fails when the water pressure is high, reaching 3MPa. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of a PPR plastic pipe hard-seal shut-off valve proposed in this utility model.

[0027] Figure 2 This is a partial structural cross-sectional view of a PPR plastic pipe hard-seal shut-off valve proposed in this utility model;

[0028] Figure 3 This is a partial structural diagram of a PPR plastic pipe hard-seal shut-off valve proposed in this utility model;

[0029] Figure 4 This is a partial structural diagram of a PPR plastic pipe hard-seal shut-off valve proposed in this utility model;

[0030] Figure 5 This is a partial structural diagram of a PPR plastic pipe hard-seal shut-off valve proposed in this utility model.

[0031] Legend:

[0032] 1. PPR plastic structure; 2. Convenient switch mechanism; 201. Square strip; 202. Threaded post; 203. Handwheel; 204. Metal gasket; 205. Nut; 3. Water inlet channel; 4. Water outlet channel; 5. Internal thread insert; 6. Sealing ring one; 7. Hexagonal opening; 8. Sealing ring two; 9. Sealing ring three; 10. Trapezoidal threaded strip; 11. Valve body; 12. Hexagonal post; 13. Plug; 14. Trapezoidal threaded groove; 15. Valve stem. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 3 , Figure 4 and Figure 5This utility model provides an embodiment of a PPR plastic pipe hard-seal shut-off valve, including a PPR plastic structure 1. The upper end of the PPR plastic structure 1 is threadedly connected to a valve body 11 for protection. The bottom end of the valve body 11 has a hexagonal opening 7, and a hexagonal column 12 is provided inside the hexagonal opening 7 for sliding connection. A plug 13 is provided at the bottom of the hexagonal column 12 for sealing. The upper end of the hexagonal column 12 has a trapezoidal threaded groove 14 for connection. The valve body 11 has a rotatable valve stem 15 inside for driving parts. The bottom end of the valve stem 15 has a trapezoidal threaded strip 10 for connection. The trapezoidal threaded groove 14 and the trapezoidal threaded strip 10 are threadedly connected and engaged. The upper end of the valve stem 15 has a convenient switching mechanism 2 for increasing the sealing performance of the device. A sealing ring 6 is slidably connected to the outer wall of the valve body 11. The plug 13 is made of copper alloy and nickel-plated on the outer surface. Its shape includes, but is not limited to, a spherical surface, a conical surface, and an arc surface.

[0035] Reference Figure 1 and Figure 5 The convenient switch mechanism 2 includes a square bar 201, which is fixed at the upper end of the valve stem 15. A threaded post 202 is provided at the top of the valve stem 15 for connection. A handwheel 203 is fixedly connected to the outer wall of the square bar 201 for opening and closing. A metal washer 204 is provided at the upper end of the handwheel 203 for pressurization. A nut 205 is threadedly connected to the outer wall of the threaded post 202.

[0036] Reference Figure 2 and Figure 5 The PPR plastic structure 1 has a water inlet channel 3 at the left end and a water outlet channel 4 at the right end for flow. The upper end of the PPR plastic structure 1 is fixedly connected to an internal thread insert 5. The upper end of the valve stem 15 is slidably connected to a sealing ring 8 for sealing. The upper middle part of the valve stem 15 is slidably connected to a sealing ring 9 for sealing.

[0037] Working principle: A PPR plastic pipe hard seal gate valve mainly includes a PPR plastic structure 1. The upper end of the PPR plastic structure 1 is threaded to a valve body 11. The bottom end of the valve body 11 is connected to a hexagonal column 12, which can slide inside the bottom end of the valve body 11. A plug 13 is provided at the bottom of the hexagonal column 12. A trapezoidal threaded groove 14 is opened inside the upper end of the hexagonal column 12. At the same time, a valve stem 15 is slidably connected to the valve body 11. A trapezoidal threaded strip 10 is provided at the bottom end of the valve stem 15. The trapezoidal threaded groove 14 and the trapezoidal threaded strip 10 are threadedly connected to each other.

[0038] When the valve is to be opened or closed, the handwheel 203 is turned. The square bar 201 is fixedly connected to the valve stem 15. The rotation of the handwheel 203 will drive the square bar 201 to rotate, thereby causing the valve stem 15 to rotate synchronously. Due to the threaded connection between the threaded post 202 at the bottom of the valve stem 15 and the nut 205, the nut 205 restricts the axial movement of the valve stem 15 during the rotation of the valve stem 15. As the valve stem 15 rotates, through its threaded engagement with the trapezoidal threaded groove 14 on the hexagonal post 12, and the hexagonal opening 7 inside the bottom of the valve body 11 restricting the rotation of the hexagonal post 12, the hexagonal post 12 and the plug 13 can only move in a straight line up and down, realizing the opening or closing operation of the valve. The metal gasket 204 plays a role in sealing, buffering and increasing friction between the handwheel 203 and other components, which helps the handwheel 203 to transmit torque more stably and ensures the smoothness and reliability of valve operation.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PPR plastic pipe hard sealing stop valve comprising a PPR plastic structure (1), characterized in that: The upper end of the PPR plastic structure (1) is threadedly connected to a valve housing (11). The bottom end of the valve housing (11) has a hexagonal opening (7). The hexagonal opening (7) has a hexagonal column (12). The upper end of the hexagonal column (12) has a trapezoidal threaded groove (14). The bottom of the hexagonal column (12) has a plug (13). The valve housing (11) has a rotatable valve stem (15). The bottom end of the valve stem (15) has a trapezoidal threaded strip (10). The trapezoidal threaded groove (14) and the trapezoidal threaded strip (10) are threadedly connected. The upper end of the valve stem (15) has a convenient switching mechanism (2). The convenient switching mechanism (2) is used to increase the sealing performance of the device.

2. A PPR plastic pipe rigid sealing stop valve according to claim 1, characterized in that: The convenient switch mechanism (2) includes a square bar (201), which is disposed at the upper end of the valve stem (15). A threaded post (202) is disposed at the top of the valve stem (15). A handwheel (203) is fixedly connected to the outer wall of the square bar (201). A metal washer (204) is disposed at the upper end of the handwheel (203). A nut (205) is threadedly connected to the outer wall of the threaded post (202).

3. A PPR plastic pipe rigid sealing stop valve according to claim 1, characterized in that: The left end of the PPR plastic structure (1) is provided with a water inlet channel (3).

4. The PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: The PPR plastic structure (1) has a water outlet channel (4) at its right end.

5. A PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: The upper end of the PPR plastic structure (1) is fixedly connected to an inner wire insert (5).

6. A PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: A sealing ring (6) is slidably connected to the outer wall of the valve body (11).

7. A PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: The plug (13) is made of copper alloy and has a nickel-plated outer surface. Its shape includes, but is not limited to, spherical, conical and arc surfaces.

8. A PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: The upper end of the valve stem (15) is slidably connected to a sealing ring two (8).

9. A PPR plastic pipe hard-seal shut-off valve according to claim 1, characterized in that: The valve stem (15) is slidably connected to a sealing ring three (9) in the upper middle part.

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