Full-cartridge compression gate valve structure and manufacturing method thereof

Abstract

This invention discloses a fully press-fit gate valve structure and its manufacturing method. The structure includes a valve body, valve cover, valve stem, gate, and handwheel. The main features include a convex shaft in the middle of the valve stem, a valve stem hole and a mounting hole in the valve cover, and upper and lower inner shoulders manufactured by a hot spinning process within the valve stem hole, along with a positioning groove formed between the upper and lower inner shoulders. The convex shaft is then rotatably mounted within this positioning groove, ensuring that it can rotate freely within the groove without falling off. In other words, the valve stem is positioned and rotated within the valve stem hole. Simultaneously, a press-fit interface is provided at the mounting hole port of the valve cover, containing an O-ring that forms a sealing contact with the outer surface of the valve body. A groove is also provided on the outer circumference of the valve cover to fix the valve body and valve cover, thus forming a sealed installation of the valve cover on top of the valve body. Therefore, the improved gate valve structure combined with the manufacturing method has advantages such as simple assembly, reliable use, reduced processing steps, and lower processing costs.

Description

Technical Field

[0001] This invention relates to a gate valve structure in pipeline valves, specifically a fully press-fit gate valve structure and its manufacturing method. Background Technology

[0002] Gate valves are commonly used shut-off valves in pipeline systems, offering advantages such as low flow resistance, simple operation, and reliable shut-off sealing, thus enjoying a wide range of applications. Currently, the structure of a gate valve typically consists of a valve body, valve cover, valve stem, gate, and handwheel. The valve cover contains an axially penetrating valve stem hole, into which the valve stem is inserted from top to bottom or bottom to top. It is then installed using packing or by securing it with double O-rings, shoulders, or retaining rings. This creates a positioning and sealing mechanism for the valve stem within the valve stem hole. However, this rotational sealing positioning structure requires the cooperation of other components, making the assembly process somewhat cumbersome. Furthermore, after prolonged use, the valve stem is prone to displacement due to damage to other components, thus affecting the reliability of the gate valve. Meanwhile, the valve cover is mainly connected to the top of the valve body by screwing on the thread, which not only adds the threading process of metal processing, but also makes the assembly and forming more inconvenient. In addition, both the valve cover and the valve body are made from bar stock or copper ingots through hot forging or casting into blanks, and then the blanks are machined into shape, which also increases the processing cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a fully pressurized gate valve structure and its manufacturing method that is simple to assemble, reliable to use, and can reduce processing steps and processing costs.

[0004] The technical problem of this invention is solved by the following technical solution:

[0005] A fully press-fit gate valve structure includes a valve body, a valve cover, a valve stem, a gate, and a handwheel. The valve stem has a convex shaft in the middle. The valve cover has a valve stem hole and a mounting hole. The valve stem hole has an upper inner shoulder and a lower inner shoulder, as well as a positioning groove formed between the upper and lower inner shoulders. The convex shaft is rotatably mounted in the positioning groove. The valve cover is sealed and mounted on the top of the valve body through the mounting hole. A retaining groove is provided on the outer circumference of the valve cover, and the valve body and the valve cover are fixed by the retaining groove.

[0006] The valve cover is made of stainless steel or brass with good ductility, formed by stamping and stretching.

[0007] The valve cover has a crimping interface at the mounting hole port, and an O-ring is provided inside the crimping interface to form a sealing contact with the outer surface of the valve body.

[0008] The valve body has a protruding tube on its top that matches the mounting hole of the valve cover.

[0009] The mounting hole and the protruding tube are matching round holes and round tubes.

[0010] The valve stem outer circumference surface above the convex shaft is provided with double O-rings.

[0011] The valve body has a compression interface at each of its two ends, and an O-ring is installed in each compression interface.

[0012] A method for manufacturing a fully press-fit gate valve structure includes the following steps:

[0013] Step 1: Select a stainless steel hollow tube or brass hollow tube of appropriate length and diameter as the valve cover blank according to the specifications.

[0014] Step 2: The upper part of the valve cover blank is spun into a valve stem tube with a reduced outer diameter using a heated spinning process. A valve stem hole is formed inside the valve stem tube, and the mounting hole of the valve cover blank is located below the valve stem hole.

[0015] Step 3: The upper part of the valve stem tube is spun using a heated spinning process to further reduce the outer diameter of the valve stem tube, thereby forming an upper inner shoulder in the valve stem hole;

[0016] Step 4: Use a water-expansion molding process to form a crimping interface at the mounting hole port of the valve cover blank. At the same time, the valve stem hole is shaped to ensure dimensional fit with the valve stem.

[0017] Step 5: Manufacture the valve stem, and provide a cam shaft in the middle of the valve stem and a double O-ring located above the cam shaft;

[0018] Step 6: Insert the valve stem with double O-rings into the valve stem hole of the valve cover from bottom to top through the mounting hole until the upper stepped surface of the cam shaft contacts the upper inner shoulder of the valve stem hole and is limited, while the double O-rings make dynamic sealing contact with the valve stem hole.

[0019] Step 7: Roll the lower part of the valve stem tube using a rolling process to further reduce the outer diameter of the valve stem tube, thereby forming a lower inner shoulder in the valve stem hole. This lower inner shoulder contacts the lower step surface of the cam shaft, and a positioning groove is formed between the upper and lower inner shoulders to allow the cam shaft of the valve stem to be positioned and rotated, so as to ensure that the cam shaft can rotate freely in the positioning groove but will not fall off.

[0020] Step 8: Fit the valve cover with valve stem from Step 7 into the convex tube on the top of the valve body through the mounting hole, and connect the lower end of the valve stem to the gate plate inside the valve body. At the same time, use a clamping groove formed by a clamping process on the outer circumference of the valve cover to fix the valve body and the valve cover, and set an O-ring in the clamping interface to contact the outer surface of the convex tube, thereby ensuring the installation seal between the valve cover and the valve body.

[0021] Step 9: The valve body is equipped with a compression port at both ends, and an O-ring is installed in each compression port;

[0022] Step 10: After installing the handwheel and lock nut on the upper end of the valve stem exposed on the top of the valve cover, the manufacturing of the fully clamped gate valve is complete.

[0023] Compared with the prior art, the present invention mainly features a convex shaft in the middle of the valve stem, a valve stem hole and a mounting hole inside the valve cover, and upper and lower inner shoulders manufactured by a hot spinning process within the valve stem hole, as well as a positioning groove formed between the upper and lower inner shoulders. The convex shaft is then positioned and rotatably installed within this positioning groove, ensuring that the convex shaft can rotate freely within the positioning groove without falling off, meaning the valve stem can be positioned and rotated within the valve stem hole. Simultaneously, a clamping interface is provided at the mounting hole port of the valve cover, containing an O-ring that forms a sealing contact with the outer surface of the valve body. A retaining groove is also provided on the outer circumference of the valve cover, and the valve body and valve cover are fixed through this groove, thus forming a sealed installation of the valve cover on top of the valve body. Clearly, the above-mentioned valve... The mounting structure of the stem, valve cover, and valve body offers advantages such as simple assembly and reliable use. In particular, the elimination of the traditional threaded tightening method for the valve cover eliminates the threading process in metalworking, resulting in reduced material waste, fewer processing steps, and faster processing speed. It also simplifies the valve structure, making it easier to process and assemble, and making valve assembly more convenient. In addition, the valve cover and valve body are directly formed by stamping and stretching from highly ductile materials such as brass and stainless steel, which has two advantages: first, it eliminates the need for the traditional processing method of first hot forging or casting a blank from bar stock or copper ingot and then machining the blank; second, it facilitates the deformation of the valve cover and valve body to achieve a snap-fit ​​connection, thus effectively reducing the processing cost of the gate valve. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of a hollow tubular valve cover blank.

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of the valve stem tube produced by heating and spinning.

[0027] Figure 4 for Figure 3 A schematic diagram of the structure in which the valve stem tube is heated and spun to form the upper inner shoulder.

[0028] Figure 5 for Figure 4 A schematic diagram of the valve cover blank being formed by hydroforming to create a clamping interface.

[0029] Figure 6 for Figure 5A schematic diagram of the structure in which the valve stem is installed inside the valve stem hole.

[0030] Figure 7 for Figure 6 A schematic diagram of the structure in which the valve stem tube is heated and spun to form the lower inner shoulder.

[0031] Figure 8 for Figure 7 A schematic diagram of the structure in which the valve cover is assembled on top of the valve body.

[0032] Figure 9 A cross-sectional view of the completed valve cover.

[0033] Figure 10 This is a schematic diagram of the valve stem. Implementation

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] like Figures 1-10 As shown, 1. Valve body, 11. Protruding tube, 2. Valve cover, 21. Valve stem tube, 22. Valve stem hole, 23. Mounting hole, 24. Upper inner shoulder, 25. Slot, 26. Positioning slot, 27. Lower inner shoulder, 3. Valve stem, 31. Protruding shaft, 32. Upper stepped surface, 33. Lower stepped surface, 4. Gate, 5. Handwheel, 6. Locking nut, 7. Double O-ring, 8. O-ring, 9. Press-fit interface.

[0036] A fully press-fit gate valve structure and its manufacturing method, such as Figure 1 As shown, this is a commonly used shut-off valve in pipeline systems. The structure of this fully press-fit gate valve mainly includes valve body 1, valve cover 2, valve stem 3, gate 4, and handwheel 5. Among them, the valve body 1 is made of a material with a certain degree of ductility, which can be used for press-fit connection. The valve cover 2 is also made of stainless steel or brass with good ductility, which is stamped and stretched, thus omitting the metal processing process.

[0037] The valve cover 2 has an axially penetrating through hole, which is divided into a coaxial valve stem hole 22 and a mounting hole 23. The diameter of the mounting hole is larger than that of the valve stem hole and is located below the valve stem hole 22.

[0038] The valve stem hole 22 is provided with an upper inner shoulder 24 and a lower inner shoulder 27 manufactured by a heating spinning process, and a positioning groove 26 is formed between the upper and lower inner shoulders; the valve stem 3 is provided with a convex shaft 31 in the middle, which is a convex round shaft coaxial with the valve stem, and the shaft diameter of the convex shaft 31 must be larger than the shaft diameter of the valve stem 3, and a double O-ring 7 is also provided on the outer circumference of the valve stem above the convex shaft 31.

[0039] The cam shaft 31 is rotatably mounted in the positioning groove 26, thereby ensuring that the cam shaft 31 can rotate freely in the positioning groove 26 without falling off. In other words, the valve stem 3 can form a positioning rotation in the valve stem hole 22, and the valve stem 3 also forms a dynamic sealing contact in the valve stem hole 22 through the double O-rings 7, thereby ensuring the sealing performance of the valve stem 3 rotation.

[0040] The valve cover 2 is sealed and installed on the top of the valve body 1 through the mounting hole 23. Specifically, a protruding tube 11 is provided on the top of the valve body to fit the mounting hole of the valve cover. In this embodiment, the mounting hole 23 and the protruding tube 11 are a round hole and a round tube that fit together.

[0041] The valve cover 2 is also provided with a crimping interface 9 formed by a water expansion molding process at the mounting hole 23 port, and an O-ring 8 is provided in the crimping interface. This ensures that when the valve cover 2 and the convex tube 11 on the top of the valve body are fitted together, the valve cover 2 and the outer surface of the valve body 1, that is, the outer surface of the convex tube 11, form a sealed contact. Furthermore, a crimping groove 25 formed by a crimping process is provided on the outer circumference of the valve cover 2, and the valve body 1 and the valve cover 2 are fixed by the crimping groove, thereby forming a sealed installation of the valve cover on the top of the valve body.

[0042] The valve body 1 is also provided with a compression interface 9 at both ends, and an O-ring 8 is provided in each compression interface to prevent leakage when the valve body 1 is compression connected in the pipeline system and to ensure good connection sealing performance.

[0043] Therefore, the installation structure of the valve stem 3, valve cover 2 and valve body 1 has the advantages of simple assembly and reliable use. In particular, since the valve cover 2 does not need to use the traditional thread tightening method, the threading process of metal processing is omitted, which reduces material loss, fewer processing steps and faster processing speed. At the same time, it simplifies the valve structure, facilitates processing and assembly, and makes the assembly and forming of the valve more convenient.

[0044] Moreover, the valve cover 2 and valve body 1 are directly formed by stamping and stretching from materials with good ductility, such as brass and stainless steel, which has two advantages: First, it eliminates the need for the traditional processing method of first hot forging or casting a blank from bar stock or copper ingot, and then processing the blank into shape; second, it facilitates the deformation of the valve cover and valve body to achieve a snap-fit ​​connection, thus effectively reducing the processing cost of the gate valve.

[0045] The manufacturing method of the aforementioned fully press-fit gate valve structure mainly includes the following steps:

[0046] Step 1: Select according to specifications Figure 2 Use stainless steel hollow tubes or brass hollow tubes of suitable length and diameter as valve cover blanks.

[0047] Step 2: The upper part of the valve cover blank is spun using a heated spinning process. Figure 3The valve stem tube 21 shown has a reduced outer diameter, and a valve stem hole 22 is formed inside the valve stem tube, while the mounting hole 23 of the valve cover blank is located below the valve stem hole 22.

[0048] Step 3: The upper part of the valve stem tube 21 is spun using a heated spinning process to further reduce the outer diameter of the valve stem tube, thereby forming a valve stem hole 22. Figure 4 The upper inner shoulder 24 is shown;

[0049] Step 4: Form the valve cover blank at the mounting hole 23 end using a water-expansion forming process. Figure 5 The clamping interface 9 shown also shapes the valve stem hole 22 to ensure dimensional fit with the valve stem 3.

[0050] Step 5: Manufacture valve stem 3, and provide a cam 31 in the middle of the valve stem and a double O-ring 7 located above the cam;

[0051] Step 6: Insert the valve stem 3 with the double O-ring 7 as follows Figure 6 As shown, it is inserted into the valve stem hole 22 of the valve cover 2 from bottom to top through the mounting hole 23 until the upper step surface 32 of the cam 31 contacts the upper inner shoulder 24 of the valve stem hole 22 and is limited, while the double O-ring 7 dynamically seals and contacts the valve stem hole 22.

[0052] Step 7: Roll the lower part of the valve stem tube 21 using a rolling process to further reduce the outer diameter of the valve stem tube, thereby forming a ring inside the valve stem hole 22. Figure 7 The lower inner shoulder 27 shown contacts the lower step surface 33 of the cam 31, and forms a positioning groove 26 between the upper and lower inner shoulders for the cam 31 of the valve stem 3 to be positioned and rotated, so as to ensure that the cam 31 can rotate freely in the positioning groove 26 but will not fall off.

[0053] Step 8: Fit the valve cover 2 with valve stem 3 from Step 7 into the protruding tube 11 on the top of the valve body via the mounting hole 23, and connect the lower end of the valve stem to the gate 4 inside the valve body. Simultaneously, apply [something] to the outer circumference of the valve cover 2. Figure 8 The clamping process shown forms a groove 25 to fix the valve body 1 and the valve cover 2, and an O-ring 8 is provided in the clamping interface 9 to contact the outer surface of the convex tube 11, thereby ensuring the installation seal between the valve cover 2 and the valve body 1.

[0054] Step 9: The valve body 1 is provided with a compression port 9 at both ends, and an O-ring 8 is provided in each compression port;

[0055] Step 10: After installing the handwheel 5 and the lock nut 6 on the upper end of the valve stem 3 exposed on the top of the valve cover 2, the manufacturing of the fully clamped gate valve is completed.

[0056] The above description is merely a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included within the protection scope of the present invention.

Claims

1. A fully press-fit gate valve structure, comprising a valve body (1), a valve cover (2), a valve stem (3), a gate (4), and a handwheel (5), characterized in that... The valve stem (3) is provided with a convex shaft (31) in the middle. The valve cover (2) is provided with a valve stem hole (22) and a mounting hole (23). The valve stem hole (22) is provided with an upper inner shoulder (24) and a lower inner shoulder (27), and a positioning groove (26) is formed between the upper and lower inner shoulders. The convex shaft (31) is rotatably mounted in the positioning groove (26). The valve cover (2) is sealed and mounted on the top of the valve body (1) through the mounting hole (23). A retaining groove (25) is provided on the outer circumferential surface of the valve cover (2), and the valve body (1) and the valve cover (2) are fixed through the retaining groove. The valve cover (2) is made of stainless steel or brass with good ductility. Stretching and forming; the valve cover (2) has a crimping interface (9) at the mounting hole (23) port, and an O-ring (8) is provided in the crimping interface to form a sealing contact with the outer surface of the valve body (1); the top of the valve body (1) has a convex tube (11) that fits into the mounting hole (23) of the valve cover (2); the mounting hole (23) and the convex tube (11) are a round hole and a round tube that fit into each other; the valve stem (3) above the convex shaft (31) has a double O-ring (7) on its outer circumference; the two ports of the valve body (1) are respectively provided with crimping interfaces (9), and an O-ring (8) is provided in each crimping interface.

2. The manufacturing method of a fully press-fit gate valve structure according to claim 1, characterized in that... The manufacturing method includes the following steps: Step 1: Select a stainless steel hollow tube or brass hollow tube of appropriate length and diameter as the valve cover blank according to the specifications. Step 2: The upper part of the valve cover blank is spun into a valve stem tube (21) with a reduced outer diameter using a heating spinning process. A valve stem hole (22) is formed inside the valve stem tube, and the mounting hole (23) of the valve cover blank is located below the valve stem hole (22). Step 3: The upper part of the valve stem tube (21) is spun using a heating spinning process to reduce the outer diameter of the valve stem tube again, thereby forming an upper inner shoulder (24) in the valve stem hole (22). Step 4: Use a water-expansion molding process to form a crimping interface (9) at the port of the mounting hole (23) of the valve cover blank. At the same time, the valve stem hole (22) is shaped to ensure the dimensional fit between it and the valve stem (3). Step 5: Manufacture the valve stem and provide a cam (31) and a double O-ring (7) above the cam in the middle of the valve stem (3). Step 6: Insert the valve stem (3) with double O-rings (7) into the valve stem hole (22) of the valve cover (2) from bottom to top through the mounting hole (23) until the upper step surface (32) of the cam (31) contacts the upper inner shoulder (24) of the valve stem hole (22) and is limited, while the double O-rings (7) dynamically seal in contact with the valve stem hole (22); Step 7: Roll the lower part of the valve stem tube (21) using a rolling process to reduce the outer diameter of the valve stem tube again, thereby forming a lower inner shoulder (27) in the valve stem hole (22). The lower inner shoulder contacts the lower step surface (33) of the cam shaft (31), and a positioning groove (26) is formed between the upper and lower inner shoulders for the cam shaft (31) of the valve stem (3) to be positioned and rotated, so as to ensure that the cam shaft (31) can rotate freely in the positioning groove (26) but will not fall off. Step 8: Fit the valve cover (2) with valve stem (3) from Step 7 into the convex tube (11) on the top of the valve body (1) through the mounting hole (23), and connect the lower end of valve stem (3) to the gate (4) inside the valve body (1). At the same time, use a clamping groove (25) formed by the clamping process on the outer circumference of the valve cover (2) to fix the valve body (1) and the valve cover (2), and set an O-ring (8) in the clamping interface (9) to contact the outer surface of the convex tube (11), thereby ensuring the installation seal between the valve cover (2) and the valve body (1). Step 9: A crimping port (9) is set at both ends of the valve body (1), and an O-ring (8) is set in each crimping port; Step 10: Install the handwheel (5) and lock nut (6) on the upper end of the valve stem (3) exposed on the top of the valve cover (2), thus completing the manufacturing of the full-clamp gate valve.

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