Pneumatic control valve

Abstract

The utility model relates to a pneumatic control valve, which comprises an actuating mechanism, a positioner, a pneumatic rod, a valve rod, a valve core, a pointer and a valve body, the actuating mechanism is linked with the pneumatic rod, the valve rod is fixed below the pneumatic rod and is coaxial with the pneumatic rod, the length direction of the pointer is perpendicular to the pneumatic rod and is positioned on the pneumatic rod, and the positioner is positioned on the left side of the pointer. The valve rod is slidably installed in the valve body in the vertical direction, a valve element is fixed to the bottom of the valve rod, the valve body comprises an inflow channel located on the left side of the valve element and an outflow channel located on the right side of the valve element, a valve seat is arranged at the position, between the inflow channel and the outflow channel, of the valve body, and the inner wall of the valve seat is attached to the circumferential direction of the valve element. And the limiting ring is made of a material which is easy to deform. According to the pneumatic control valve, the limiting ring abuts against the upper portion of the valve element in the unused state, and the possibility that liquid flowing into the channel flows to the flowing-out channel through the abraded position of the valve element and the valve seat is further reduced.

Description

Technical Field

[0001] The utility model relates to a regulating valve, in particular to a pneumatic regulating valve. Background Art

[0002] Pneumatic control valve is a key component in industrial automation control systems, mainly used to accurately control the flow, pressure, temperature, liquid level and other process parameters of fluids (such as gas, liquid, etc.) in pipelines.

[0003] The pneumatic regulating valve mainly includes an actuator, a positioner, a pneumatic rod, a valve stem, a valve core, a pointer and a valve body. The valve stem is fixedly installed under the pneumatic rod and is coaxially arranged with the pneumatic rod. The bottom of the valve stem is located in the valve body and fixed to the valve core. The pneumatic rod and the valve stem are driven up and down by starting the actuator (cylinder, pneumatic diaphragm, etc.), so that the valve core can cut off or connect the fluid channels on the left and right sides of the valve core of the valve body. A pointer is also fixed on the pneumatic rod. The pointer points to the caliper on the positioner, so as to realize the precise change of the height of the valve stem and the pneumatic rod and accurately adjust the liquid flow in the valve body.

[0004] A valve seat is usually provided in the valve body and cooperates with the valve core to form a sealing pair to prevent or regulate the flow of fluid in the valve. When the valve is closed, the valve core is tightly pressed against the valve seat to form a reliable seal to prevent leakage of the medium. However, as the valve stem drives the valve core to continuously move up and down, that is, it contacts and separates from the valve seat many times, the valve seat may be worn. Therefore, how to improve the sealing between the valve seat and the valve core has become a problem to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a pneumatic regulating valve in which a limit ring abuts against the valve core when not in use to further reduce the possibility of liquid flowing into the channel flowing to the outflow channel through the wear between the valve core and the valve seat.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: it is composed of an actuator, a positioner, a pneumatic rod, a valve stem, a valve core, a pointer and a valve body, the actuator is linked with the pneumatic rod, the valve stem is fixed below the pneumatic rod and is coaxially arranged with the pneumatic rod, the length direction of the pointer is perpendicular to the pneumatic rod and is located on the pneumatic rod, the positioner is located on the left side of the pointer, the valve stem is slidably installed in the valve body along the up and down directions and a valve core is fixed at the bottom, the valve body includes an inflow channel located on the left side of the valve core and an outflow channel located on the right side of the valve core, a valve seat is arranged on the valve body between the inflow channel and the outflow channel, the inner wall of the valve seat is in contact with the circumference of the valve core, a limit ring is fixedly installed on the valve seat above the valve core, and the limit ring is made of a material that is easy to deform.

[0007] The utility model is further configured as follows: a matching groove for inserting the valve core is arranged on the limit ring, and the matching groove is arranged in a narrowed shape from top to bottom.

[0008] The utility model is further configured as follows: the valve seat includes a limiting section and a matching section, the matching section is located below the limiting section, the valve body is located on the left side of the matching section and is protrudingly provided with a positioning plug, and the matching section is provided with a positioning groove for the positioning plug to be installed.

[0009] The utility model is further configured as follows: the valve core includes a resistance section at the top, the diameter of the limiting section is larger than the matching section, the resistance section is located in the limiting section and the lower end surface is against the upper end surface of the matching section.

[0010] The utility model is further configured as follows: the valve body is provided with a connecting block protruding from the right side of the matching section, the matching section is provided with a connecting slot corresponding to the connecting block, the connecting block is provided with a matching slot recessed inwardly, the matching slot is arranged in a ring shape, and the valve body is located in the connecting slot and a matching block is provided corresponding to the matching slot.

[0011] The utility model is further configured to include a left filter plate and a right filter plate, wherein the left filter plate is located in the inflow channel and is detachably connected to the valve body, and the right filter plate is located in the outflow channel and is detachably connected to the valve body.

[0012] The utility model is further configured as follows: it also includes a matching plate and a bolt, the right filter plate includes a mounting section, the valve body is provided with a mounting groove corresponding to the mounting section, the matching plate is located on the right side of the mounting groove, and the bolt is inserted into the matching plate and the mounting section and matched with the valve body thread.

[0013] By adopting the above technical scheme, 1. Since the valve seat includes a limit ring and the limit ring is located above the valve core, when not in use, if the matching part of the valve core and the valve seat is worn, and the limit ring is pressed on the top of the valve core, the original liquid can pass through the wear between the valve core and the valve seat from the inlet channel to the outlet channel, but will be blocked by the limit ring and will not flow to the outlet channel, thereby strengthening the sealing of the valve seat and the valve core; 2. When it is necessary to move the pneumatic rod and the valve stem upward, the upward force can make the valve core move upward and pass over the limit ring made of a deformable material. Similarly, when the inlet channel and the outflow channel need to be cut off after use, the downward valve core passes over the limit ring and can be located between the inlet channel and the outflow channel. Therefore, the limit ring made of a deformable material can make the valve core move up and down to achieve smoother connection and cutoff of the inlet channel and the outflow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a cross-sectional view of a specific implementation mode of the utility model;

[0016] Figure 2 for Figure 1 A magnified view of middle;

[0017] Figure 3 for Figure 1 Enlarged view of middle B;

[0018] Figure 4 for Figure 1 Enlarged view of C in the middle.

[0019] In the figure: 1-actuator;

[0020] 2-Locator;

[0021] 3-pneumatic rod, 31-pointer;

[0022] 4-valve stem, 41-valve core, 411-contact section;

[0023] 5-valve body, 51-inflow channel, 52-outflow channel, 53-positioning plug, 54-connecting plug, 541-matching slot, 55-installation slot;

[0024] 6-valve seat, 61-limiting ring, 611-matching groove, 62-limiting section, 63-matching section, 631-positioning groove, 632-connecting slot, 6321-matching plug;

[0025] 7-left filter plate;

[0026] 8-right filter plate, 81-installation section;

[0027] 9-Matching plate;

[0028] 10-Bolts. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1-Figure 4As shown, the utility model discloses a pneumatic regulating valve, which is composed of an actuator 1, a positioner 2, a pneumatic rod 3, a valve stem 4, a valve core 41, a pointer 31 and a valve body 5. The actuator 1 is linked with the pneumatic rod 3. The valve stem 4 is fixed below the pneumatic rod 3 by welding, key connection, etc. and is coaxially arranged with the pneumatic rod 3. The length direction of the pointer 31 is perpendicular to the pneumatic rod 3 and is located on the pneumatic rod 3. The positioner 2 is located on the left side of the pointer 31. The valve stem 4 is slidably installed in the valve body 5 along the up and down direction and The bottom is fixed with a valve core 41 by welding or other methods. The valve body 5 includes an inflow channel 51 located on the left side of the valve core 41 and an outflow channel 52 located on the right side of the valve core 41. By starting the actuator 1, the cylinder, pneumatic film and other objects in the actuator 1 can drive the pneumatic rod 3 to move upward, thereby driving the valve stem 4 and the valve core 41 to move upward. As the valve core 41 moves upward, the liquid in the inflow channel 51 can flow out from the outflow channel 52. Because the pointer 31 is fixed on the pneumatic stem, the pneumatic rod 3 is moved upward. During the movement of the pneumatic rod 3, the pointer 31 can cooperate with the positioner 2 to accurately control the moving distance of the pneumatic rod 3, thereby realizing accurate control of the flow rate in the regulating valve (this is a prior art and will not be elaborated on here). The valve body 5 is provided with a valve seat 6 between the inflow channel 51 and the outflow channel 52. The inner wall of the valve seat 6 is in contact with the circumference of the valve core 41. The valve seat 6 is located above the valve core 41 and is fixedly installed with a limit ring 61 by bonding, integral molding, etc. The limit ring 61 is made of rubber, etc. 1. Since the valve seat 6 includes a stop ring 61 and the stop ring 61 is located above the valve core 41, when not in use, if the matching portion of the valve core 41 and the valve seat 6 is worn, and the stop ring 61 is pressed on the valve core 41, the liquid originally flows from the inflow channel 51 through the worn portion between the valve core 41 and the valve seat 6 toward the outflow channel 52, but will be blocked by the stop ring 61 and will not flow toward the outflow channel 52, thereby strengthening the sealing between the valve seat 6 and the valve core 41; 2. When it is necessary to move the pneumatic rod 3 and the valve stem 4 upward, the upward force can make the valve core 41 move upward and pass over the limit ring 61 made of a deformable material. Similarly, when the inflow channel 51 and the outflow channel 52 need to be cut off after use, the downward valve core 41 passes over the limit ring 61 and can be located between the inflow channel 51 and the outflow channel 52. Therefore, the limit ring 61 made of a deformable material can make the valve core 41 move up and down to achieve smoother connection and cutoff of the inflow channel 51 and the outflow channel 52.

[0031] Among them, the limit ring 61 is provided with a matching groove 611 for the valve core 41 to be inserted, and the matching groove 611 is configured to be tapered from top to bottom. Since the matching groove 611 is configured to be tapered, when the valve core 41 is installed, the bottom will first enter the widest part of the matching groove 611, and then the valve core 41 will face downward to complete the matching with the valve seat 6. Because the bottom width of the matching groove 611 is the smallest, when the valve core 41 is matched with the valve seat 6, the part with the largest physical width of the limit ring 61, i.e., the bottom, matches with the upper end of the valve core 41 to achieve stable pressure holding, so that the limit ring 61 can stably play a sealing role.

[0032] Among them, the valve seat 6 includes a limiting section 62 and a matching section 63, the matching section 63 is located below the limiting section 62, the valve body 5 is located on the left side of the matching section 63 and a positioning block 53 is protrudingly provided, and the matching section 63 is provided with a positioning groove 631 for the positioning block 53 to be installed. Since the valve body 5 is located on the left side of the matching section 63 and the positioning block 53 is protruding, after the valve seat 6 is installed into the valve body 5, the positioning block 53 will be inserted into the positioning groove 631 of the matching section 63 to achieve the initial positioning of the valve seat 6 and the valve body 5. In the absence of external force, the positioning block 53 will not rotate circumferentially or move axially, which provides convenience for the fixation of the valve seat 6 and the valve body 5.

[0033] Among them, the valve core 41 includes a resistance section 411 at the top, the diameter of the limiting section 62 is larger than the diameter of the matching section 63, the resistance section 411 is located in the limiting section 62 and the lower end face is against the upper end face of the matching section 63. Since the diameter of the limiting section 62 is larger than the matching section 63 and the resistance section 411 is located in the limiting section 62 and the lower end is against the matching section 63, when the actuator 1 is started and the pneumatic rod 3 and the valve stem 4 are moved downward to drive the valve core 41 to move downward, the resistance section 411 will be located in the limiting section 62 and will be restricted downward by the matching section 63, thereby realizing the downward path limitation of the valve core 41.

[0034] Among them, the valve body 5 is provided with a connecting plug 54 protruding on the right side of the matching section 63, the matching section 63 is provided with a connecting slot 632 corresponding to the connecting plug 54, the connecting plug 54 is provided with a matching slot 541 recessed inwardly, the matching slot 541 is arranged in an annular shape, and the valve body 5 is provided with a matching plug 6321 corresponding to the matching slot 541 in the connecting slot 632. Since the matching slot 541 recessed inwardly and arranged in an annular shape is provided on the connecting plug 54, when the valve seat 6 is installed in the valve body 5, the matching section 63 of the valve seat 6 needs to be deformed radially inwardly so that the part of the connecting plug 54 located on the left side of the matching slot 541 is forced to pass over the connecting slot 632. The matching plug 6321 is used to achieve the matching of the matching plug 6321 and the matching slot 541, so that the connecting plug 54 on the valve body 5 can be stably located in the valve seat 6 without the action of external force, so that the valve seat 6 and the valve body 5 are stably connected together. Therefore, when the liquid exerts a force on the valve core 41 and the valve seat 6, the valve seat 6 can still be stably located on the valve body 5; and when the valve seat 6 is worn and needs to be replaced, the valve seat 6 is removed by deforming the valve seat 6 radially inward to separate the connecting plug 54 from the connecting slot 632, and then a new valve seat 6 is replaced to achieve the matching of the connecting plug 54 and the connecting slot 632, and the positioning plug 53 is inserted into the positioning slot 631 to achieve the stable installation of the valve seat 6 in the valve body 5.

[0035] In addition, the valve body 5 includes a left filter plate 7 and a right filter plate 8. The left filter plate 7 is located in the inflow channel 51 and is detachably connected to the valve body 5 by means of bolts, snaps, etc., and the right filter plate 8 is located in the outflow channel 52 and is detachably connected to the valve body 5 by means of bolts, snaps, etc. Since the left filter plate 7 is located in the inflow channel 51 and is detachable from the valve body 5, and the right filter plate 8 is located in the outflow channel 52 and is detachable from the valve body 5, the liquid entering the valve body 5 will first contact the left filter plate 7 so that impurities in the liquid can be blocked by the left filter plate 7. After the valve core 41 is moved upward, the liquid passes through the left filter plate 7 and then enters the outflow channel 52. When the liquid needs to flow out of the outflow channel 52, the liquid needs to pass through the right filter plate 8. If there are still large particles of impurities in the liquid at this time, they can be intercepted by the action of the right filter plate 8, so that the liquid flowing out of the valve body 5 can be filtered twice, thereby reducing the possibility of impurities in the liquid.

[0036] The valve body 5 further comprises a matching plate 9 and a bolt 10. The right filter plate 8 comprises a mounting section 81. The valve body 5 is provided with a mounting groove 55 corresponding to the mounting section 81. The matching plate 9 is located on the right side of the mounting groove 55. The bolt 10 is inserted into the matching plate 9 and the mounting section 81 and is threadedly matched with the valve body 5. Since the mounting section 81 of the right filter plate 8 is located in the mounting groove 55, the matching plate 9 is installed in the valve body 5. The matching plate 9 can exert a leftward force on the matching plate 9 so that the mounting section 81 is located in the matching groove 55. The bolt 10 is inserted into the matching plate 9 and the mounting section 81 to complete the threaded matching with the valve body 5, so that in the process of the liquid flowing from the inlet channel 51 to the outlet channel 52 and out of the valve body 5, the right filter plate 8 can still be stably located in the valve body 5 under the impact of the fluid. When it is necessary to remove the right filter plate 8 from the valve body 5, the bolt 10 is removed, and the matching plate 9 is removed at this time, and then the right filter plate 8 can be removed from the valve body 5 to achieve cleaning of the right filter plate 8.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic regulating valve, consisting of an actuator, a positioner, a pneumatic rod, a valve stem, a valve core, a pointer and a valve body, wherein the actuator is linked to the pneumatic rod, the valve stem is fixed below the pneumatic rod and is coaxially arranged with the pneumatic rod, the length direction of the pointer is perpendicular to the pneumatic rod and is located on the pneumatic rod, the positioner is located on the left side of the pointer, the valve stem is slidably installed in the valve body along the up and down direction and a valve core is fixed at the bottom, the valve body includes an inflow channel located on the left side of the valve core and an outflow channel located on the right side of the valve core, and is characterized in that: The valve body is provided with a valve seat between the inflow channel and the outflow channel, the inner wall of the valve seat is in circumferential fit with the valve core, the valve seat is fixedly installed with a limit ring above the valve core, and the limit ring is made of a material that is easy to deform.

2. A pneumatic regulating valve according to claim 1, characterized in that: The limiting ring is provided with a matching groove for inserting the valve core, and the matching groove is configured to be narrowed from top to bottom.

3. A pneumatic regulating valve according to claim 2, characterized in that: The valve seat comprises a limiting section and a matching section, wherein the matching section is located below the limiting section, and the valve body is provided with a positioning plug protruding from the left side of the matching section, and a positioning groove for the positioning plug to be installed is provided on the matching section.

4. A pneumatic regulating valve according to claim 3, characterized in that: The valve core comprises a resistance section at the top, the diameter of the limiting section is larger than the matching section, the resistance section is located in the limiting section and the lower end surface of the resistance section is against the upper end surface of the matching section.

5. The pneumatic regulating valve according to claim 3, characterized in that: The valve body is provided with a connecting block protruding from the right side of the matching section, the matching section is provided with a connecting slot corresponding to the connecting block, the connecting block is provided with a matching slot recessed inwardly, the matching slot is arranged in a ring shape, and the valve body is located in the connecting slot and a matching block is provided corresponding to the matching slot.

6. The pneumatic regulating valve according to claim 1, characterized in that: It also includes a left filter plate and a right filter plate. The left filter plate is located in the inflow channel and is detachably connected to the valve body. The right filter plate is located in the outflow channel and is detachably connected to the valve body.

7. A pneumatic regulating valve according to claim 6, characterized in that: It also includes a matching plate and bolts. The right filter plate includes a mounting section. The valve body is provided with a mounting groove corresponding to the mounting section. The matching plate is located on the right side of the mounting groove. The bolts are inserted into the matching plate and the mounting section and matched with the valve body thread.

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