High-pressure zero-leakage forged steel gate valve
By using split forged steel parts to form the valve body and automatically adjusting the sealing surface fit using the ball crown core, the existing forged steel gate valves have high consumption, high processing difficulty and low sealing performance, and the sealing performance of high pressure zero leakage is achieved.
Patent Information
- Application Number
- CN202520661810.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2035-04-09
AI Technical Summary
The valve body of the existing forged steel gate valve is processed and molded by the integral forgings, which consumes a lot of material, is expensive, is difficult to process and is low in processing accuracy, resulting in a degradation of sealing performance.
The valve body is composed of split forged steel parts, and the channel body and the middle cavity are formed by welding to reduce material losses, improve processing accuracy, and use a ball crown core in the gate assembly to automatically adjust the sealing surface fit.
It reduces the material consumption and processing difficulty of the valve body, improves the processing accuracy and sealing performance, and realizes a high-pressure zero-leakage forged steel gate valve.
Smart Images
Figure CN222894677U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of valves, and in particular relates to a forged steel gate valve. Background Art
[0002] In high-pressure medium working conditions, valves are required to have high-pressure resistance. The valve body of the gate valve, as the main pressure-bearing component of the gate valve, is required to be made of forged steel, which is called a forged steel gate valve. Its structure is generally composed of a valve body, a valve seat, a gate, a valve stem, and a valve cover. The plane sealing surfaces on both sides of the gate and the valve seat sealing surfaces in the inlet and outlet channels of the valve body cooperate with each other to form a double sealing pair. The valve body of the existing forged steel gate valve is formed by integral forgings, in which the cavity part is processed from a solid cylinder to form a circular inner cavity, which consumes a lot of materials, has high product manufacturing costs, and is difficult to process. The processing accuracy between the middle cavity and the channel is difficult to guarantee; the gate and the valve seat have processing errors that affect the matching performance between the sealing surfaces of the two, resulting in a decrease in the sealing performance of the sealing pair. Utility Model Content
[0003] The utility model aims to provide a high-pressure zero-leakage forged steel gate valve with a valve body composed of split forged steel parts, which reduces material loss and improves processing accuracy. The gate can automatically adjust to seal with the valve seat during closing, and the product has low cost and good sealing performance.
[0004] The technical solution to realize the utility model is:
[0005] A high-pressure zero-leakage forged steel gate valve comprises a valve body, a valve seat, a gate assembly, a valve stem, a valve cover and a bracket. The gate assembly consists of a gate frame, a left gate and a right gate. The left gate and the right gate form a V-shaped sealing surface. The gate frame is installed at the lower end of the valve stem. The upper end of the valve stem passes through the valve cover and the valve stem nut to be connected with the transmission mechanism. The valve stem nut is installed in the mounting cavity of the bracket through an upper bearing and a lower bearing. A packing sealing device is arranged between the valve stem and the valve cover. A self-sealing device is arranged between the valve cover and the valve body. The valve seat is installed in the inlet and outlet channels of the valve body and cooperates with the sealing surfaces on both sides of the gate to form a V-shaped double sealing secondary structure. The left gate and the right The gate plates are movably embedded in the gate plate frame through circular grooves on the outer circumferential surfaces, and a top core is arranged at the center of the contact plane between the left gate plate and the right gate plate; its characteristics are: the top core is composed of two symmetrical ball crowns connected by a center positioning pin, and is installed in the spherical concave cavity at the center of the contact plane between the left gate plate and the right gate plate, and the spherical concave cavities of the left gate plate and the right gate plate are in contact with the spherical surface of the ball crown, so that the left gate plate and the right gate plate can rotate stably with the spherical surface of the ball crown, and automatically adjust the fit with the valve seat sealing surface during the closing process; the valve body is composed of a channel body and a middle cavity body through welding, which reduces valve body consumables, reduces processing difficulty, and improves processing accuracy.
[0006] In the above technical scheme, a composite sealing structure is formed by a self-sealing device and an oil sealing device between the valve cover and the valve body. The self-sealing device is composed of a self-tightening sealing ring, a four-open ring, and a support plate. The upper ring surface of the self-tightening sealing ring is pressed and installed between the valve cover and the middle cavity by the lower ring surface of the four-open ring. The support plate is installed on the upper ring surface of the four-open ring and is tightened and connected to the valve cover by screws passing through screw holes. The inner hole wall and the outer cylindrical surface of the support plate are respectively dynamically sealed with the outer cylindrical surface of the valve cover and the inner wall of the middle cavity of the valve body; the oil sealing device is composed of a sealing cavity between the lower plane of the support plate and the valve cover and a grease injection valve on the middle cavity. The grease injection valve is connected to the sealing cavity through the oil injection hole to inject sealing oil into the sealing cavity; the packing sealing device is provided with a grease sealing ring, and the inner cavity of the grease sealing ring is connected to the sealing cavity through the oil hole on the valve cover.
[0007] In the above technical solution, dustproof sealing rings are respectively provided between the valve stem nut and the bracket on the upper side of the upper bearing and the lower side of the lower bearing, and a screw-on oil cup is provided on the bracket outside the cavity between the upper bearing and the lower bearing, and the cavity is connected to the internal thread of the valve stem nut through an oil inlet hole.
[0008] In the above technical scheme, the gate frame is located below the center line and has semicircular bosses on the left and right sides respectively, which are movably matched with the circular grooves at the lower ends of the left and right gate plates. The arc-shaped buckle is fixedly installed on the upper end of the gate frame by a nut. The arc-shaped buckle is provided with arc bosses on the left and right sides, which are movably matched with the circular grooves at the upper ends of the left and right gate plates. The left and right gate plates are movably buckled between the gate frame and the arc-shaped buckle.
[0009] The beneficial effects of the utility model compared with the prior art are:
[0010] 1. The valve body is composed of a channel body and a middle cavity body by welding. The middle cavity body is formed by cylindrical forgings, which reduces material loss, reduces valve body cost, improves processing accuracy, and solves the problems of high material cost, great processing difficulty and low processing accuracy of the existing forged steel gate valve body using integral forged steel parts;
[0011] 2. A top core composed of two spherical crowns is set at the center of the contact plane between the left gate and the right gate. The spherical concave cavities of the left gate and the right gate are in surface contact with the spherical surface of the spherical crown, which improves the stability of the left gate and the right gate when they rotate with the spherical surface of the spherical crown. During the closing process, the fit between the gate sealing surface and the valve seat sealing surface is automatically adjusted to improve the matching accuracy between the sealing surfaces;
[0012] 3. The valve cover and the valve body are equipped with a composite sealing structure consisting of a self-sealing device and an oil sealing device to achieve zero leakage sealing in the middle cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Figure 2This utility model Figure 1 Schematic diagram of the structure of the middle gate assembly.
[0015] Figure 3 This utility model Figure 1 Connection structure diagram between the middle valve stem nut and the bracket.
[0016] In the figure: 1 channel body, 2 valve seat, 3 middle cavity, 4 right gate, 5 top core, 6 positioning pin, 7 gate frame, 8 arc buckle, 9 nut, 10 valve stem, 11 valve cover, 12 self-tightening sealing ring, 13 four open rings, 14 support plate, 15 packing pad, 16 packing, 17 packing sleeve, 18 packing pressure plate, 19 bracket, 20 valve stem nut, 21 upper bearing, 22 dustproof sealing ring, 23 screw-on oil cup, 24 oil guide hole, 25 lower bearing, 26 cavity, 27 oil hole, 28 sealing cavity, 29 oil filling hole, 30 circular groove, 31 arc boss, 32 semicircular boss, 33 left gate. DETAILED DESCRIPTION
[0017] like Figures 1 to 3The high-pressure zero-leakage forged steel gate valve shown in the figure comprises a valve body, a valve seat 2, a gate assembly, a valve stem 10, a valve cover 11, and a bracket 19. The gate assembly comprises a gate frame 7, a left gate 33, and a right gate 4. The left gate 33 and the right gate 4 form a V-shaped sealing surface. The gate frame 7 is installed at the lower end of the valve stem 10. The upper end of the valve stem 10 passes through the valve cover 11 and the valve stem nut 20 to be connected with the transmission mechanism. The valve stem nut 20 is installed in the installation cavity of the bracket 19 through the upper bearing 21 and the lower bearing 25. A packing sealing device is arranged between the valve stem 10 and the valve cover 11. The packing sealing device is composed of a packing pad 15, a packing 16, and a packing sleeve 17. The packing pressure plate 18 is pressed once, and a self-sealing device is arranged between the valve cover 11 and the valve body. The self-sealing device is composed of a self-tightening sealing ring 12, a four-open ring 13, and a support plate 14. The upper ring surface of the self-tightening sealing ring 12 is pressed and installed between the valve cover 11 and the middle cavity 3 by the lower ring surface of the four-open ring 13. The support plate 14 is installed on the upper ring surface of the four-open ring 13 and is tightened and connected to the valve cover 11 by screws passing through the screw holes. The inner hole wall and the outer cylindrical surface of the support plate 14 are respectively matched with the outer cylindrical surface of the valve cover 11 and the inner wall of the middle cavity 3 in a dynamic seal. The lower part of the self-tightening sealing ring 12 and the valve cover 11 are matched with each other by a conical surface. Under the pressure of the medium in the middle cavity, , so that the valve cover 11 and the support plate 14 float upward as a whole, and the self-tightening sealing ring 12 is wedged between the valve cover 11 and the inner wall of the middle cavity of the valve body to achieve self-sealing of the middle cavity; the valve seat 2 is installed in the inlet and outlet channels of the valve body and cooperates with the sealing surfaces of the left gate plate 33 and the right gate plate 4 to form a V-shaped double sealing secondary structure, the left gate plate 33 and the right gate plate 4 are respectively movably embedded in the gate plate frame 7 through the circular groove 30 on the outer circumferential surface, and a top core 5 is set at the center of the contact plane between the left gate plate 33 and the right gate plate 4; its characteristic is that: the top core 5 is composed of two symmetrical ball crowns connected by a positioning pin 6, and the positioning pin 6 is installed in the center hole of the contact plane between the two ball crowns The spherical concave cavity in the center of the contact plane between the left gate plate 33 and the right gate plate 4 is in contact with the spherical surface of the spherical crown, which increases the contact area between the top core 5 and the left gate plate 33 and the right gate plate 4, so that the left gate plate 33 and the right gate plate 4 can rotate stably with the spherical surface of the spherical crown, and automatically adjust the fit with the sealing surface of the valve seat 2 during the closing process; the valve body is composed of a channel body 1 and a middle cavity body 3 by welding, and the middle cavity body 3 is formed by cylindrical forgings, which effectively solves the problems of high difficulty in processing and large material waste of the integral solid forgings used in the prior art valve body, can reduce valve body consumables, reduce processing difficulty, and improve processing accuracy.
[0018] A composite sealing structure is formed between the valve cover 11 and the valve body by a self-sealing device and an oil sealing device. The oil sealing device is composed of a sealing cavity 28 formed between the lower plane of the support plate 14 and the valve cover 11, and a grease injection valve on the middle cavity 3. The grease injection valve is connected with the sealing cavity 28 through an oil injection hole 29, and sealing oil is injected into the sealing cavity 28 to form a double sealing structure between the middle cavity 3 and the valve cover 11; a grease sealing ring is provided in the middle of the packing sealing device, and the inner cavity of the grease sealing ring is connected with the sealing cavity 28 through an oil hole 27 on the valve cover 11, and sealing oil is injected into the grease sealing ring to form a double sealing structure between the valve stem 10 and the valve cover 11.
[0019] The technical effect of this technical feature is that a double sealing structure is formed between the valve cover 11 and the middle cavity 3 and the valve stem 10, thereby achieving zero leakage in the middle cavity.
[0020] Dustproof seals 22 are provided between the valve stem nut 20 and the bracket 19 on the upper side of the upper bearing 21 and the lower side of the lower bearing 25, respectively. A cavity 26 is formed between the upper bearing 21 and the lower bearing 25. A screw-on oil cup 23 is provided on the bracket 19 outside the cavity 26. The cavity 26 is connected to the inner thread of the valve stem nut 20 through an oil introduction hole 24, and the grease in the cavity 26 is introduced into the threaded connection between the valve stem nut 20 and the valve stem 10. Figure 3 shown.
[0021] The technical effect produced by this technical feature is that the lubricating oil is simultaneously injected into the upper bearing 21, the lower bearing 25 and the threaded connection between the valve stem nut 20 and the valve stem 10 through the screw-on oil cup 23, thereby maintaining the lubrication performance of the upper bearing 21 and the lower bearing 25 and the transmission reliability between the valve stem nut 20 and the valve stem 10.
[0022] On the left and right sides below the center line of the inner hole of the gate frame 7, semicircular bosses 32 are respectively provided to flexibly cooperate with the circular grooves 30 of the left gate plate 33 and the right gate plate 4. An arc buckle 8 is fixedly installed on the upper end of the gate frame 7 by a nut 9. The left and right sides of the arc buckle 8 are provided with arc bosses 31 to flexibly cooperate with the circular grooves 30 at the upper ends of the left gate plate 33 and the right gate plate 4. The left gate plate 33 and the right gate plate 4 are flexibly buckled between the gate frame 7 and the arc buckle 8. The semicircular bosses 32 and the arc bosses 31 are clearance-matched with the circular grooves 30, so that the left gate plate 33 and the right gate plate 4 form a floating connection structure with the gate frame 7, such as Figure 2 shown.
[0023] The technical effect produced by this technical feature is that the left gate plate 33 and the right gate plate 4 form a floating connection structure with the gate plate frame 7. During the closing process, the fit between the left gate plate 33 and the right gate plate 4 and the sealing surface of the valve seat 2 is automatically adjusted to improve the sealing fit accuracy between the sealing surfaces.
Claims
1. A high-pressure zero-leakage forged steel gate valve, comprising a valve body, a valve seat (2), a gate assembly, a valve stem (10), a valve cover (11), and a bracket (19); the gate assembly comprises a gate frame (7), a left gate (33), and a right gate (4); the left gate (33) and the right gate (4) form a V-shaped sealing surface; the gate frame (7) is mounted on the lower end of the valve stem (10); the upper end of the valve stem (10) passes through the valve cover (11) and the valve stem nut (20) and is connected to a transmission mechanism; the valve stem nut (20) is mounted on the bracket through an upper bearing (21) and a lower bearing (25) A packing sealing device is arranged in the installation cavity of the frame (19) between the valve stem (10) and the valve cover (11), a self-sealing device is arranged between the valve cover (11) and the valve body, a valve seat (2) is arranged in the inlet and outlet passages of the valve body and cooperates with the sealing surfaces of the left gate plate (33) and the right gate plate (4) to form a V-shaped double sealing auxiliary structure, the left gate plate (33) and the right gate plate (4) are respectively movably embedded in the gate plate frame (7) through the circular groove (30) on the outer circumferential surface, and a top core (5) is arranged at the center of the contact plane between the left gate plate (33) and the right gate plate (4); the invention is characterized in that: The top core (5) is composed of two symmetrical spherical caps connected by a positioning pin (6), the positioning pin (6) being installed in the center hole of the contact plane of the two spherical caps, and the spherical concave cavity at the center of the contact plane of the left gate plate (33) and the right gate plate (4) is in contact with the spherical surface of the spherical cap, so that the left gate plate (33) and the right gate plate (4) can stably rotate along with the spherical surface of the spherical cap, and automatically adjust the fit with the sealing surface of the valve seat (2) during the closing process; the valve body is composed of a channel body (1) and a middle cavity body (3) by welding, and the middle cavity body (3) is formed by processing a cylindrical forging.
2. The high-pressure zero-leakage forged steel gate valve according to claim 1 is characterized in that: An oil seal device and a self-sealing device are arranged between the valve cover (11) and the valve body to form a composite sealing structure. The oil seal device is composed of a sealing cavity (28) formed between the lower plane of the support plate (14) and the valve cover (11), and a grease injection valve on the middle cavity (3). The grease injection valve is connected to the sealing cavity (28) through an oil injection hole (29) to inject sealing oil into the sealing cavity (28). A grease sealing ring is arranged in the middle of the packing sealing device, and the inner cavity of the grease sealing ring is connected to the sealing cavity (28) through an oil hole (27) on the valve cover (11).
3. The high-pressure zero-leakage forged steel gate valve according to claim 1 or 2, characterized in that: Dustproof sealing rings (22) are respectively provided between the valve stem nut (20) and the bracket (19) on the upper side of the upper bearing (21) and the lower side of the lower bearing (25); a cavity (26) is formed between the upper bearing (21) and the lower bearing (25); a screw-on oil cup (23) is provided on the bracket (19) outside the cavity (26); and the cavity (26) is communicated with the internal thread of the valve stem nut (20) via an oil inlet hole (24).
4. The high-pressure zero-leakage forged steel gate valve according to claim 1 or 2, characterized in that: Semicircular bosses (32) movably matched with the circular grooves (30) of the left gate plate (33) and the right gate plate (4) are respectively provided on the left and right sides below the center line of the inner hole of the gate plate frame (7). A circular arc buckle (8) is fixedly installed on the upper end of the gate plate frame (7) by a nut (9). The circular arc buckle (8) is provided with circular arc bosses (31) movably matched with the circular grooves (30) at the upper ends of the left gate plate (33) and the right gate plate (4) on the left and right sides. The left gate plate (33) and the right gate plate (4) are movably buckled between the gate plate frame (7) and the circular arc buckle (8).