A zero-leakage full-bore control valve with quickly replaceable internal parts

Abstract

The present invention discloses a zero-leakage full-diameter control valve with quickly replaceable internal parts, comprising a valve body, an inlet flow channel and an outlet flow channel arranged in the valve body, a valve seat arranged in the inlet flow channel, the valve seat and the valve body being detachably connected, a valve stem fixedly arranged on the valve body, a self-sealing valve flap assembly connected to the valve stem, and the self-sealing valve flap assembly and the valve seat are in sealing cooperation. The present invention provides a zero-leakage full-diameter control valve with quickly replaceable internal parts, which has a reasonable structural design, good overall sealing performance, long service life, is convenient for online repair and maintenance, and is conducive to wide promotion.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, in particular to a zero-leakage full-diameter control valve with internal parts that can be quickly replaced. Background Art

[0002] The control valve is an actuator in the automatic control system, and its application quality is directly reflected in the regulation quality of the system. As the terminal element in process control, people have a newer understanding of its importance than in the past. The application of the control valve is good or bad, in addition to the quality of the product itself, whether the user correctly installs, uses and maintains it, correct calculation and selection are very important.

[0003] Existing control valves have a short service life when they are severely eroded by materials, cannot be sealed when pressure is backflowing, and there are safety hazards of leakage and overpressure upstream. They cannot be quickly inspected and repaired on site, which affects the progress of inspection and maintenance. The seal cannot achieve zero leakage and there is a risk of leakage. The valve disc cannot be fully opened, which affects the flow of materials and causes serious erosion on the surface of the valve disc. The selection of the drive device is very limited, making it difficult to achieve on-site and remote intelligent control.

[0004] For example, an "air pilot valve, color change valve, reversing valve, ratio control valve and flow control valve" disclosed in Chinese patent documents, with announcement number CN113833869A, includes a valve seat, a cylinder, a piston, an elastic member and a sealing assembly, the valve seat is provided with a liquid inlet and a liquid outlet, the cylinder is connected to the valve seat, the end of the cylinder away from the valve seat is detachably provided with a cylinder head, the cylinder is provided with a first air inlet, the cylinder head is provided with a second air inlet, the elastic member is arranged in the first accommodating chamber, and one end of the elastic member abuts against the piston, and the other end abuts against the inner wall of the cylinder head, the sealing assembly includes a sealing shaft and a sealing head, the sealing head is arranged in the valve seat, one end of the sealing shaft is connected to the piston, and the other end of the sealing shaft is interference fit with the sealing head, and the piston is used to drive the sealing shaft and the sealing head to move in the process of sliding relative to the first accommodating chamber so that the sealing head closes or opens the liquid outlet. The disadvantage is that the internal parts cannot be quickly replaced, and the on-site inspection and maintenance cannot be quickly carried out, which affects the inspection and maintenance progress. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems in the prior art that the control valve seal cannot achieve zero leakage, the internal parts cannot be quickly replaced, and it is not convenient for online repair and maintenance. A zero-leakage full-diameter control valve with quickly replaceable internal parts is provided, which has a reasonable structural design, good overall sealing, long service life, is convenient for online repair and maintenance, and is conducive to wide promotion.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A zero-leakage full-bore control valve with quickly replaceable internal parts comprises a valve body, wherein the valve body is provided with an inlet flow channel and an outlet flow channel, wherein the inlet flow channel is provided with a valve seat, wherein the valve seat is detachably connected to the valve body, wherein a valve stem is fixedly provided on the valve body, wherein the valve stem is connected with a self-sealing valve flap assembly, and the self-sealing valve flap assembly is in sealing cooperation with the valve seat. The valve seat in the inlet flow channel of the valve body is detachably connected to the valve body to realize quick replacement of the valve seat, and the valve stem drives the self-sealing valve flap assembly to realize the opening and closing of the control valve, and when both ends of the self-sealing valve flap assembly are in contact and seal cooperation with the valve seat, the control valve is closed, and the self-sealing valve flap assembly rotates 90 degrees counterclockwise, the control valve is opened, and fluid materials pass through. The zero-leakage full-bore intelligent control valve with quickly replaceable internal parts of the patented invention has a reasonable structural design, good overall sealing, long service life, and can quickly replace the valve seat, which is convenient for online repair and maintenance, and is conducive to wide promotion.

[0008] Preferably, a shock absorbing structure is provided between the self-sealing valve flap assembly and the rocker to prevent the self-sealing valve flap assembly and the valve seat from having a hard collision, and the shock absorbing structure includes a ball head connecting rod and an elastic sheet. A ball head connecting rod and an elastic sheet shock absorbing device are provided between the self-sealing valve flap assembly and the rocker to prevent the self-sealing valve flap assembly and the valve seat from having a hard collision, thereby preventing the sealing performance and service life from being affected.

[0009] Preferably, the contact surface between the self-sealing valve flap assembly and the valve seat is an automatic sealing spherical structure. The self-sealing valve flap assembly adopts an automatic sealing spherical structure, which can automatically and completely fit the spherical sealing surface of the valve seat in any state. The spherical surface of the self-sealing valve flap assembly adopts a special hardening treatment of spraying tungsten carbide to resist medium erosion. At the same time, the spherical sealing surface of the valve seat adopts a double sealing structure of a sealing surface and a sealing ring with a special hardening treatment of spraying tungsten carbide, which can easily achieve a zero-leakage sealing level.

[0010] Preferably, the ball head connecting rod and the self-sealing valve flap assembly are spherically connected with a certain self-fitting space. The ball head connecting rod and the self-sealing valve flap assembly are spherically connected with a certain self-fitting space, so that the spherical surface of the self-sealing valve flap assembly and the spherical double sealing surface of the valve seat are automatically and tightly fitted, thereby enhancing the sealing performance and preventing pipeline vibration or other working conditions from affecting the sealing performance.

[0011] Preferably, the front section of the valve stem is fixed by a bearing, and the rear end of the valve stem is fixedly sealed with a stuffing box in cooperation with auxiliary stuffing. The stuffing box is cooperated with auxiliary stuffing to achieve sealing of the valve stem.

[0012] Preferably, the valve stem is connected to the rocker arm via a flat key and a set screw.

[0013] Preferably, a fastening nut is installed at the top of the ball head connecting rod, an elastic sheet is arranged between the fastening nut and the rocker, and a cylindrical pin for preventing loosening is arranged on the fastening nut. The cylindrical pin on the fastening nut is used for preventing loosening.

[0014] Preferably, the valve stem is driven by a driving device, which drives a self-sealing valve disc assembly connected to the valve body and cooperating with the valve seat through the valve stem.

[0015] Preferably, the valve body is a welded valve body or an integrally cast valve body.

[0016] Preferably, a pressing mechanism is provided on the valve body, the pressing mechanism is fixedly connected to the valve body, the pressing mechanism comprises a torsion spring, a button, a fixed rod and a swing arm, a rotating wheel is provided on one end of the fixed rod, the torsion spring is sleeved on the fixed rod, one end of the torsion spring abuts against the fixed rod, the other end of the torsion spring abuts against the swing arm, and the button abuts against the swing arm. The torsion spring, button, fixed rod and swing arm included in the pressing mechanism form an integral body, when the button is pressed at one end of the self-sealing valve flap assembly, the rotating wheel rotates clockwise, and when the button is released at one end of the self-sealing valve flap assembly, the rotating wheel rotates counterclockwise.

[0017] Preferably, the rotating wheel is provided with gear teeth, the rotating wheel is adapted to the slide slot, the slide slot is slidably connected to the valve body, the slide slot is provided with a protective sheet at one end close to the self-sealing valve flap assembly, the protective sheet is elastic, and the contact between the button and the protective sheet and the valve body is provided with a sealing structure. The valve stem is connected to one end of the self-sealing valve flap assembly, and the self-sealing valve flap assembly is easily deformed by impact. The rotating wheel rotates clockwise, driving the slide slot to move outward, and the protective sheet extends and slightly abuts against one side of the self-sealing valve flap assembly, which prevents the valve flap from deforming and increases the life of the valve flap. The rotating wheel rotates counterclockwise and the protective sheet retracts. The protective sheet is elastic and will not interfere with the rotation of the self-sealing valve flap assembly.

[0018] The present invention has the following beneficial effects: (1) reasonable structural design, good overall sealing performance, long service life, easy online maintenance, and conducive to wide promotion; (2) the shock-absorbing device avoids hard collision between the self-sealing valve disc assembly and the valve seat, thereby preventing the sealing performance and service life from being affected; (3) the spherical surface of the self-sealing valve disc assembly adopts a special hardening treatment of sprayed tungsten carbide to resist medium erosion, while the spherical sealing surface of the valve seat adopts a double sealing structure of a sealing surface and a sealing ring that is specially hardened by spraying tungsten carbide, thereby easily achieving a zero leakage sealing level; (4) the protective sheet prevents the valve disc from deforming and increases the service life of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the valve stem in the present invention;

[0021] Figure 3 yes Figure 1 The enlarged schematic diagram of point Ⅰ in the middle;

[0022] Figure 4 yes Figure 1 The enlarged schematic diagram of the middle II;

[0023] Figure 5 yes Figure 1 A partial enlarged view of

[0024] Figure 6 It is a structural schematic diagram of the pressing mechanism in the present invention.

[0025] In the figure: valve body 1, valve seat 2, self-sealing valve disc assembly 3, valve stem 4, bearing 5, stuffing box 6, auxiliary stuffing 7, rocker 8, flat key 9, set screw 10, ball head connecting rod 11, elastic sheet 12, sealing ring 13, fastening nut 14, cylindrical pin 15, pressing mechanism 17, torsion spring 17.1, button 17.2, fixing rod 17.3, swing arm 17.4, rotating wheel 17.5, gear 17.6, protective sheet 18, slide groove 19. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to the accompanying drawings and examples. Specific embodiment one:

[0028] like Figure 1 or Figure 2 or Figure 3 or Figure 4 As shown, a zero-leakage full-diameter control valve with quickly replaceable internal parts includes a valve body 1, an inlet flow channel and an outlet flow channel are arranged in the valve body 1, a valve seat 2 is arranged in the inlet flow channel, the valve seat 2 is detachably connected to the valve body 1, a valve stem 4 is fixedly arranged on the valve body 1, a self-sealing valve flap assembly 3 is connected to the valve stem 4, and the self-sealing valve flap assembly 3 is sealed with the valve seat 2. A shock-absorbing structure for preventing the self-sealing valve flap assembly 3 and the valve seat 2 from having a hard collision is arranged between the self-sealing valve flap assembly 3 and the rocker 8, and the shock-absorbing structure includes a ball head connecting rod 11 and an elastic sheet 12. The contact surface of the self-sealing valve flap assembly 3 with the valve seat 2 is an automatic sealing spherical structure. The ball head connecting rod 11 and the self-sealing valve flap assembly 3 are spherically connected with a certain self-fitting space. The front section of the valve stem 4 is fixed by a bearing 5, and the rear end of the valve stem 4 cooperates with the stuffing box 6 to fix and seal with the auxiliary stuffing 7. The valve stem 4 is connected to the rocker 8 by a flat key 9 and a set screw 10. A fastening nut 14 is installed at the top of the ball head connecting rod 11, an elastic sheet 12 is arranged between the fastening nut 14 and the rocker 8, and a cylindrical pin 15 for preventing loosening is arranged on the fastening nut 14. The valve stem 4 is driven by a driving device. The valve body 1 is a welded valve body or an integrally cast valve body.

[0029] In the above technical scheme, the valve seat 2 in the inlet flow channel of the valve body 1 is detachably connected to the valve body 1 to realize the rapid replacement of the valve seat, and the valve stem 4 drives the self-sealing valve flap assembly 3 to realize the opening and closing of the control valve. When the two ends of the self-sealing valve flap assembly 3 are in contact and sealed with the valve seat 2, the control valve is closed, and the self-sealing valve flap assembly 3 rotates 90 degrees counterclockwise, the control valve is opened, and the fluid material passes through. The patented zero-leakage full-diameter intelligent control valve with rapidly replaceable internal parts has a reasonable structural design, good overall sealing, long service life, and can quickly replace the valve seat, which is convenient for online maintenance and is conducive to wide promotion. A ball head connecting rod 11 and an elastic sheet 12 shock-absorbing device are provided between the self-sealing valve flap assembly 3 and the rocker 8 to avoid hard collision between the self-sealing valve flap assembly 3 and the valve seat 2, and to prevent affecting the sealing performance and service life. The self-sealing valve disc assembly 3 adopts an automatic sealing spherical structure, which can automatically and completely fit the spherical sealing surface of the valve seat 2 in any state. The spherical surface of the self-sealing valve disc assembly 3 is specially hardened by spraying tungsten carbide, which is resistant to medium erosion. At the same time, the spherical sealing surface of the valve seat 2 adopts a double sealing structure of a sealing surface specially hardened by spraying tungsten carbide and a sealing ring 13, which can easily achieve a zero leakage sealing level. The ball head connecting rod 11 and the self-sealing valve disc assembly 3 are connected in a spherical manner, with a certain self-fitting space, so that the spherical surface of the self-sealing valve disc assembly 3 and the spherical double sealing surface of the valve seat 2 are automatically and tightly fitted, enhancing the sealing performance and avoiding pipeline vibration or other working conditions affecting the sealing performance. The stuffing box 6 cooperates with the auxiliary stuffing 7 to achieve the sealing of the valve stem 4. The cylindrical pin 15 on the fastening nut 14 is used to prevent loosening. The driving device drives the self-sealing valve disc assembly 3 connected to the valve body 1 through the valve stem 4 to seal with the valve seat 2. Specific embodiment 2:

[0031] like Figure 5 or Figure 6 As shown, a pressing mechanism 17 is provided on the valve body 1, and the pressing mechanism 17 is fixedly connected to the valve body 1. The pressing mechanism 17 includes a torsion spring 17.1, a button 17.2, a fixed rod 17.3 and a swing arm 17.4. A rotating wheel 17.5 is provided on one end of the fixed rod 17.3. The torsion spring 17.1 is sleeved on the fixed rod. One end of the torsion spring 17.1 abuts against the fixed rod 17.3, and the other end of the torsion spring 17.1 abuts against the swing arm 17.4. The button 17.2 abuts against the swing arm 17.4. A gear 17.6 is provided on the rotating wheel 17.5. The rotating wheel 17.5 is adapted to the slide 19. The slide 19 is slidably connected to the valve body 1. A protective sheet 18 is provided at one end of the slide 19 close to the self-sealing valve flap assembly 3. The protective sheet 18 is elastic. A sealing structure is provided at the contact between the button 17.2 and the protective sheet 18 and the valve body 1.

[0032] In the above technical solution, the torsion spring 17.1, button 17.2, fixing rod 17.3 and swing arm 17.4 included in the pressing mechanism 17 form an integral body. When the button 17.2 is pressed at one end of the self-sealing valve flap assembly 3, the rotating wheel 17.5 rotates clockwise. When the button 17.2 is released at one end of the self-sealing valve flap assembly 3, the rotating wheel 17.5 rotates counterclockwise. The valve stem is connected to one end of the self-sealing valve flap assembly 3. The self-sealing valve flap assembly 3 is easily deformed by impact. The rotating wheel 17.5 rotates clockwise to drive the slide 19 to move outward. The protective sheet 18 extends and slightly abuts against one side of the self-sealing valve flap assembly 3, which prevents the self-sealing valve flap assembly 3 from deforming and increases the life of the self-sealing valve flap assembly 3. The rotating wheel 17.5 rotates counterclockwise to retract the protective sheet 18. The protective sheet 18 is elastic and will not interfere with the rotation of the self-sealing valve flap assembly 3.

[0033] The present invention has the following beneficial effects: reasonable structural design, good overall sealing performance, long service life, easy online maintenance, and conducive to wide promotion; a shock-absorbing device avoids hard collision between the self-sealing valve flap assembly and the valve seat, thereby preventing the sealing performance and service life from being affected; the spherical surface of the self-sealing valve flap assembly is treated with special hardening treatment by spraying tungsten carbide, and is resistant to medium erosion, while the spherical sealing surface of the valve seat is treated with special hardening treatment by spraying tungsten carbide and a double sealing structure of a sealing surface plus a sealing ring, which can easily achieve a zero leakage sealing level; the protective sheet prevents the valve flap from deformation and increases the service life of the valve flap.

Claims

1. A zero-leakage full-diameter control valve with quickly replaceable internal parts, comprising a valve body (1), characterized in that: The valve body (1) is provided with an inlet flow channel and an outlet flow channel, the inlet flow channel is provided with a valve seat (2), the valve seat (2) is detachably connected to the valve body (1), the valve body (1) is fixedly provided with a valve stem (4), the valve stem (4) is connected with a self-sealing valve flap assembly (3), the self-sealing valve flap assembly (3) and the valve seat (2) are in sealing cooperation; the contact surface of the self-sealing valve flap assembly (3) and the valve seat (2) is an automatic sealing spherical structure; the spherical surface of the self-sealing valve flap assembly and the spherical sealing surface of the valve seat are respectively subjected to special hardening treatment by spraying tungsten carbide, the automatic sealing spherical structure adopts a double sealing structure of a tungsten carbide sealing surface and a sealing ring (13), the self-sealing valve flap assembly is rotated 90 degrees counterclockwise, and the control valve is opened to realize full-diameter flow; A pressing mechanism is provided on the valve body, and the pressing mechanism is fixedly connected to the valve body. The pressing mechanism includes a torsion spring, a button, a fixed rod and a swing arm. A rotating wheel is provided on one end of the fixed rod, and the torsion spring is sleeved on the fixed rod. One end of the torsion spring abuts against the fixed rod, and the other end of the torsion spring abuts against the swing arm, and the button abuts against the swing arm; the rotating wheel is provided with gear teeth, and the rotating wheel is adapted to the slide groove, and the slide groove is slidably connected to the valve body, and an elastic protective sheet is provided at one end of the slide groove close to the self-sealing valve flap assembly.

2. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 1, characterized in that: A shock absorbing structure is provided between the self-sealing valve flap assembly (3) and the rocker (8) to prevent the self-sealing valve flap assembly (3) and the valve seat (2) from causing a hard collision, the shock absorbing structure comprising a ball head connecting rod (11) and an elastic sheet (12).

3. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 2, characterized in that: The ball head connecting rod (11) and the self-sealing valve flap assembly (3) are spherically connected with a certain self-fitting space.

4. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 1, 2 or 3, characterized in that: The front section of the valve stem (4) is fixed by a bearing (5), and the rear end of the valve stem (4) cooperates with a stuffing box (6) and an auxiliary stuffing (7) to form a fixed seal.

5. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 2, characterized in that: The valve stem (4) and the rocker arm (8) are connected via a flat key (9) and a set screw (10).

6. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 2 or 3, characterized in that: A fastening nut (14) is installed at the top end of the ball head connecting rod (11), an elastic sheet (12) is provided between the fastening nut (14) and the rocker (8), and a cylindrical pin (15) for preventing loosening is provided on the fastening nut (14).

7. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 1, characterized in that: The valve body (1) is a welded valve body or an integrally cast valve body.

8. A zero-leakage full-diameter control valve with quickly replaceable internal parts according to claim 1, characterized in that: Sealing structures are provided at the contact points between the button (17.2) and the protective sheet (18) and the valve body (1).

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