Single-seat regulating valve

Abstract

The utility model discloses a single-seat regulating valve, and belongs to the technical field of regulating valves. Comprising a valve body, a sleeve, a valve element, a valve deck and a valve rod, the sleeve is arranged in the middle of the valve body, the valve deck is arranged at the upper end of the valve body and abuts against the sleeve, the valve element is arranged in the sleeve in a sliding mode, the valve rod is connected with the valve deck in a sliding mode, and the lower end of the valve rod is fixedly connected with the valve element. The valve body is provided with a medium inlet flow channel and a medium outlet flow channel, a mounting cylindrical hole is formed in the middle of the valve body, the sleeve is arranged in the mounting cylindrical hole, and the sleeve is provided with a communicating opening used for communicating the medium inlet flow channel with the medium outlet flow channel. The valve element slides along the sleeve so as to open or close the communication opening. The utility model has the advantages of simple and compact structure, tight arrangement of a sealing structure, low possibility of fluid leakage, stable and reliable use effect, low maintenance cost and excellent safety performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to a single seat regulating valve belongs to regulating valve technical field. BACKGROUND

[0002] Straight stroke regulating mechanism is an important mechanism in fluid control field, including single seat regulating valve, double seat regulating valve, three-way valve, sleeve valve, angle valve, high pressure valve, diaphragm valve, pipe clamp valve, gate valve, slide valve, axial flow throttling valve, solenoid valve and digital valve etc. The common feature of these valves is that the valve stem moves in a straight line to achieve precise fluid control. Among them, the single seat regulating valve, as a key equipment in fluid control field, its structure contains valve body, valve core, guide sleeve, upper valve cover, upper cover plate, valve stem and packing etc. The characteristic of this valve is that it has only one valve core and one valve seat, and the straight line movement of the valve stem is used to accurately control the fluid. The upper cover plate is used to fasten the packing to ensure the sealing performance; the upper valve cover is connected with the valve body through bolts to provide accurate center positioning for the valve stem and the valve core. The valve seat cooperates with the upper valve cover to not only ensure the center alignment of the valve core and the valve seat, but also change the fluid flow area when the valve core moves, so as to realize the accurate regulation of fluid flow.

[0003] When the actuator produces linear displacement, the valve stem will drive the valve core to move accordingly. If the valve core moves downward to reduce the fluid flow area, it is called a positive valve; otherwise, it is called a negative valve. This design makes the connection position of the valve core and the valve stem easy to flip, realizing the quick conversion between the positive valve and the negative valve. Especially for DN < 25mm single guide straight single seat valve, since it is only provided with a positive valve, it needs to be used with a reaction actuator when it is controlled in air opening mode. In addition, the single seat regulating valve also has the characteristics of small leakage, good sealing performance, small allowable pressure difference and small flow coefficient. In high pressure difference or large diameter application occasions, since the thrust of the fluid medium on the valve core is large, i.e. the unbalanced force is significant, the single seat regulating valve may not be the best choice. However, by designing valve cores of different shapes, the single seat regulating valve can realize flexible control of fluid characteristics.

[0004] The regulating valves on the market have many problems in the production process, such as complex structure, not compact enough, resulting in high production cost and large material consumption in the production process; and the existing regulating valves generally have the problem of not tight enough sealing structure, causing fluid leakage, affecting the use effect, and the sealing structure is not easy to replace, so that after the sealing structure fails, the entire valve core assembly needs to be replaced, the maintenance cost is high, cannot overflow pressure stabilization, and the safety performance is poor. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a single seat regulating valve.

[0006] The utility model discloses a technical scheme adopted is: design a single seat governing valve, it includes valve body, sleeve, valve core, valve cover and valve rod, the sleeve is arranged in the middle part of valve body, the valve cover is arranged on the upper end of valve body and is in close contact with the sleeve, the valve core is arranged in the sleeve and slides, the valve rod is connected with the valve cover and slides, the lower end of valve rod is fixedly connected with the valve core, the valve body is provided with medium inlet flow channel and medium outlet flow channel, the middle part of valve body is provided with installation cylinder hole, the sleeve is arranged in the installation cylinder hole, the sleeve is provided with the intercommunication mouth for intercommunication medium inlet flow channel and medium outlet flow channel, the valve core slides along the sleeve to open or close the intercommunication mouth, the inner wall of sleeve is provided with upper sealing step and lower sealing step respectively on the upper and lower sides of intercommunication mouth, when the valve core closes the intercommunication mouth, forms the sealing structure with upper sealing step and lower sealing step respectively.

[0007] Further, the upper end of the sleeve is provided with an upper limiting boss, the lower end is provided with a lower limiting boss, the lower end of the installation cylinder hole is provided with a lower stop step, the lower limiting boss abuts on the lower stop step, the upper end of the installation cylinder hole is provided with an upper stop step, the upper limiting boss is flush with the upper stop step, the valve cover and the valve body are fixedly installed and abut on the upper limiting boss and the upper stop step.

[0008] Further, the upper limiting boss and the upper stop step form a limiting groove, the lower end of the valve cover is provided with a corresponding limiting ring, when the valve cover and the valve body are fixedly connected, the limiting ring abuts in the limiting groove.

[0009] Further, the design also includes a first sealing gasket and a second sealing gasket, the first sealing gasket is arranged between the lower limiting boss and the lower stop step, the second sealing gasket is arranged in the limiting groove and is pressed tightly by the limiting ring.

[0010] Further, the lower end of the valve cover is provided with a flange, a plurality of first connecting holes are arranged on the flange, the upper end of the valve body is provided with a second connecting hole corresponding to the first connecting hole, a stud is arranged in the first connecting hole and the second connecting hole, and a nut is arranged on the upper end of the stud to connect and fix the valve body and the valve cover.

[0011] Further, the valve core is a cylindrical structure, the upper and lower sides of the middle part are respectively provided with extension bosses, the middle part of the valve core is also provided with a step hole, the lower end of the valve rod is provided with a threaded connector, the outer diameter of the threaded connector is smaller than the outer diameter of the valve rod, the valve rod is arranged in the step hole of the valve core through the threaded connector, a nut is arranged on the threaded connector and passes through the step hole, and an elastic washer is arranged between the nut and the valve core.

[0012] Further, the outer side of the upper sealing step and the lower sealing step is provided with a slope, the upper end and the lower end of the valve core are respectively provided with corresponding inclined surfaces, and the inclined surfaces of the upper end and the lower end of the valve core form a sealing structure with the slope provided on the outer side of the upper sealing step and the lower sealing step when the valve core closes the communication port.

[0013] Further, the upper end of the valve core is further provided with a trapezoidal groove.

[0014] Further, the middle part of the valve cover is provided with a slide, the valve rod is arranged in the slide, the upper end of the slide is provided with an expanded hole, the expanded hole is filled with a filler, and the upper end of the expanded hole is provided with a pressing plate.

[0015] Further, the upper end of the valve rod is provided with a threaded column, the threaded column is provided with an indicating piece and a nut, and the upper end and the lower end of the indicating piece are respectively provided with a nut to fix the indicating piece.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model only needs to set valve body, sleeve, valve core, valve cover and valve rod, simple and compact structure can reduce the production cost in the production process, and material consumption is small, and the utility model discloses a valve core and sleeve The sealing structure between is set tightly, and fluid leakage is not easy to cause, guarantees that the use effect is stable and reliable, and the sealing structure is convenient to disassemble, replace and maintain, after the sealing structure fails, only the corresponding structure can be replaced, the maintenance cost is low, can overflow pressure stabilization, and the safety performance is excellent. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0019] Figure 1 It is a sectional view of the utility model.

[0020] Figure 2 It is Figure 1 It is a local enlarged schematic view.

[0021] Figure 3 It is a top view of the utility model.

[0022] In the figure: 1, valve body; 2, sleeve; 3, valve core; 4, valve cover; 5, valve stem; 6, medium inlet flow channel; 7, medium outlet flow channel; 8, communication port; 9, upper sealing step; 10, lower sealing step; 11, upper limiting boss; 12, lower limiting boss; 13, lower stop step; 14, upper stop step; 15, limiting ring; 16, first sealing gasket; 17, second sealing gasket; 18, double head stud; 19, extension boss; 20, threaded connecting head; 21, bevel; 22, trapezoidal groove; 23, packing; 24, pressing plate; 25, indicating member. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0024] In the description of the present application, it should be noted that, unless explicitly specified and limited, if the terms "mounting", "connecting" and "connection" are used, they should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrally connected; they can be mechanically connected, or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or connected inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0025] Embodiment 1

[0026] As Figures 1-3As shown: a single seat regulating valve, comprising a valve body 1, a sleeve 2, a valve core 3, a valve cover 4 and a valve stem 5, the sleeve 2 is arranged in the middle of the valve body 1, the valve cover 4 is arranged on the upper end of the valve body 1 and abuts against the sleeve 2 (the sleeve 2 is pressed into the cylindrical hole of the valve body 1, the valve cover 4 is axially pressed, and the sleeve 2 can also be locked by threads: the outer wall of the sleeve 2 is processed with threads, screwed into the valve body 1 and sealed by welding; snap spring fixing: a snap spring groove is arranged at the lower end of the sleeve 2, and a spring retainer is used to realize bidirectional fixing; thermal assembly interference fit: the sleeve 2 and the valve body 1 are tightly fitted by temperature difference assembly; etc. The valve core 3 is slidably arranged in the sleeve 2, the valve stem 5 is slidably connected with the valve cover 4, the lower end of the valve stem 5 is fixedly connected with the valve core 3, the valve body 1 is provided with a medium inlet flow channel 6 and a medium outlet flow channel 7, the middle of the valve body 1 is provided with a mounting cylindrical hole, the sleeve 2 is arranged in the mounting cylindrical hole, the sleeve 2 is provided with a communication port 8 for communicating the medium inlet flow channel 6 and the medium outlet flow channel 7, the valve core 3 slides along the sleeve 2 to open or close the communication port 8; the inner walls of the sleeve 2 on the upper and lower sides of the communication port 8 are respectively provided with an upper sealing step 9 and a lower sealing step 10, and when the valve core 3 closes the communication port 8, the upper sealing step 9 and the lower sealing step 10 form a sealing structure respectively. Double sealing structure: when closed, the valve core 3 simultaneously presses the upper and lower sealing surfaces to form a double isolation barrier.

[0027] It can be understood that the upper end of the valve stem 5 is also provided with a driving execution component, which belongs to the conventional technical means in the art and will not be described here.

[0028] Workflow:

[0029] Medium flow path: the medium enters the valve body 1 cavity from the inlet flow channel, then enters the inside of the sleeve 2, and then enters the outlet flow channel through the communication port 8 on the sleeve 2 to be discharged. Among them, the position of the valve core 3 determines the flow area.

[0030] Example 2

[0031] This embodiment is further optimized and refined on the basis of example 1, that is, the sleeve 2 and its installation structure are further optimized and refined, specifically:

[0032] The upper end of the sleeve 2 is provided with an upper limiting boss 11, and the lower end is provided with a lower limiting boss 12. The sleeve 2 is axially limited by the upper limiting boss 11 and the lower limiting boss 12. Specifically, a lower stop step 13 is arranged on the valve body 1 at the lower end of the mounting cylindrical hole. The lower limiting boss 12 abuts against the lower stop step 13. An upper stop step 14 is arranged on the valve body 1 at the upper end of the mounting cylindrical hole. The upper limiting boss 11 is flush with the upper stop step 14. The valve cover 4 is fixedly installed on the valve body 1 and abuts against the upper limiting boss 11 and the upper stop step 14, thereby completing the fixing of the sleeve 2. The structure is simple, firm and convenient to replace.

[0033] In the embodiment, the upper limiting boss 11 and the upper stop step 14 are formed with a limiting groove. The valve cover 4 is provided with a corresponding limiting ring 15 at the lower end. When the valve cover 4 is fixedly connected with the valve body 1, the limiting ring 15 abuts against the limiting groove. The limiting groove and the limiting ring 15 facilitate the quick positioning and alignment of the valve cover 4 during installation, thereby improving the assembly speed.

[0034] The single-seat regulating valve further comprises a first sealing gasket 16 and a second sealing gasket 17. The first sealing gasket 16 is arranged between the lower limiting boss 12 and the lower stop step 13 and is clamped by the two. The second sealing gasket 17 is arranged in the limiting groove and is pressed by the limiting ring 15. The sealing performance of the sleeve 2 is improved in all directions by the sealing ends arranged at the upper and lower ends.

[0035] Embodiment 3

[0036] The embodiment is further optimized and refined on the basis of the valve cover 4 structure in Embodiment 2. Specifically,

[0037] The lower end of the valve cover 4 is provided with a flange. A plurality of first connecting holes are arranged on the flange. The upper end of the valve body 1 is provided with second connecting holes corresponding to the first connecting holes. Double-headed studs 18 are arranged in the first connecting holes and the second connecting holes. Nuts are arranged on the upper ends of the double-headed studs 18 to connect and fix the valve body 1 and the valve cover 4. The valve cover 4 and the valve body 1 are connected and fixed by a plurality of screws. On the one hand, a detachable connection structure is formed, which is convenient for replacement and maintenance. On the other hand, the screw connection is stable and reliable.

[0038] Embodiment 4

[0039] The embodiment is further optimized and refined on the basis of the valve core 3 structure in Embodiment 3. Specifically,

[0040] The valve core 3 is a cylindrical structure, and an extension boss 19 is arranged on the middle part of the valve core 3. The valve core 3 is further provided with a stepped hole. The lower end of the valve rod 5 is provided with a threaded connector 20, and the outer diameter of the threaded connector 20 is smaller than the outer diameter of the valve rod 5. The valve rod 5 is arranged in the stepped hole of the valve core 3 through the threaded connector 20. The threaded connector 20 passes through the stepped hole and is provided with a nut on the threaded connector 20. The nut and the valve core 3 are provided with an elastic gasket.

[0041] When the cylindrical valve core 3 cooperates with the sleeve 2, high-precision guidance can be achieved through a large contact area, movement deflection is reduced, and vibration resistance is enhanced. In addition, the cylindrical structure is more likely to realize symmetrical stress, thereby reducing the risk of valve core 3 blockage caused by medium impact. The full-circle contact sealing form of the cylindrical valve core 3 and the sleeve 2 can significantly reduce the leakage amount, and is especially suitable for working conditions requiring strict sealing (such as high pressure or corrosive medium). In some designs, the surface of the valve core 3 is embedded with a hard alloy coating or a soft sealing ring, which further reduces the leakage rate to level IV. The machining of the cylindrical valve core 3 can achieve micron-level tolerance through precision grinding or electrochemical machining, thereby ensuring the cooperation accuracy with the sleeve 2. In addition, the cylindrical structure is more convenient for adopting hardfacing hard alloy or ceramic spraying process, thereby improving wear resistance and corrosion resistance, and adapting to high temperature and high pressure working conditions. The modular design of the cylindrical valve core 3 supports quick replacement, for example, through threaded connection to replace spare parts.

[0042] In the embodiment, the outer sides of the upper sealing step 9 and the lower sealing step 10 are provided with slopes, and the upper end and the lower end of the valve core 3 are respectively provided with corresponding inclined surfaces 21. When the valve core 3 closes the communication port 8, the inclined surfaces 21 at the upper end and the lower end of the valve core 3 respectively form a sealing structure with the slopes arranged on the outer sides of the upper sealing step 9 and the lower sealing step 10.

[0043] In the embodiment, the inclined surface 21 arranged on the upper end of the valve core 3 is further provided with a trapezoidal groove 22.

[0044] Embodiment 5

[0045] The embodiment is further optimized and refined on the basis of the structure of the valve cover 4 in Embodiment 4, and specifically:

[0046] The middle part of the valve cover 4 is provided with a slide, the valve rod 5 is arranged in the slide, the upper end of the slide is provided with an expanded hole, the expanded hole is filled with a filler 23, and the upper end of the expanded hole is provided with a pressing plate 24. The structure is simple, and the maintenance and use are convenient.

[0047] In the embodiment, the upper end of the valve stem 5 is provided with a threaded column, the threaded column is provided with an indicating element 25 and a nut, and the upper and lower sides of the indicating element 25 are respectively provided with a nut to fix the indicating element 25. The indicating element 25 is mainly used to intuitively display the real-time position and opening degree state of the valve core 3. Specifically, the indicating element 25 can reflect the displacement amount of the valve core 3 and the current opening degree (such as full opening, full closing or intermediate adjustment position) of the valve by synchronously moving with the valve stem 5. In combination with the forward or reverse structure of the valve stem 5, the moving direction of the indicating element 25 can assist in judging the positive and negative action forms of the valve (for example, the flow area decreases or increases when the valve stem 5 moves downward). In addition, during manual operation or positioner adjustment, the indicating element 25 provides a mechanical position reference for the operator, facilitating quick confirmation of the correspondence between the actual opening degree of the valve and the control signal. By observing the position of the aluminum plate, it can be quickly judged whether the valve is in a safe state (such as whether it is reset to a preset air opening / air closing position in case of failure), reducing the risk of misoperation. It should be noted that the aluminum plate indicating element 25 is usually used in combination with a scale or a positioner feedback device to achieve more accurate adjustment and state monitoring.

[0048] In addition, in the description of the present application, unless otherwise stated, the terms "a plurality of", "a plurality of", "a plurality of" mean two or more, and "a plurality of", "a plurality of", "a plurality of" mean one or more. In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] The specific embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A single seat control valve characterized by: The valve body, sleeve, valve core, valve cover and valve rod, the sleeve is arranged in the middle of the valve body, the valve cover is arranged on the upper end of the valve body and abuts against the sleeve, the valve core is slidably arranged in the sleeve, the valve rod is slidably connected with the valve cover, the lower end of the valve rod is fixedly connected with the valve core, the valve body is provided with a medium inlet flow channel and a medium outlet flow channel, the valve body is provided with an installation cylindrical hole in the middle, the sleeve is arranged in the installation cylindrical hole, the sleeve is provided with a communication port for communicating the medium inlet flow channel and the medium outlet flow channel, the valve core slides along the sleeve to open or close the communication port; the inner wall of the sleeve on both sides of the communication port is respectively provided with an upper sealing step and a lower sealing step, when the valve core closes the communication port, the upper sealing step and the lower sealing step form a sealing structure respectively.

2. A single seat control valve according to claim 1, characterized in that: The upper end of the sleeve is provided with an upper limiting boss, the lower end is provided with a lower limiting boss, the lower end of the installation cylindrical hole is provided with a lower stop step, the lower limiting boss abuts against the lower stop step, the upper end of the installation cylindrical hole is provided with an upper stop step, the upper limiting boss is flush with the upper stop step, the valve cover and the valve body are fixedly installed and abut against the upper limiting boss and the upper stop step.

3. A single seat control valve according to claim 2, wherein: The upper limiting boss and the upper stop step form a limiting groove, the lower end of the valve cover is provided with a corresponding limiting ring, when the valve cover and the valve body are fixedly connected, the limiting ring abuts against the limiting groove.

4. A single seat control valve according to claim 3, wherein: It also includes a first sealing gasket and a second sealing gasket, the first sealing gasket is arranged between the lower limiting boss and the lower stop step, the second sealing gasket is arranged in the limiting groove and is pressed tightly by the limiting ring.

5. A single seat control valve according to claim 4, wherein: The lower end of the valve cover is provided with a flange, the flange is provided with a plurality of first connecting holes, the upper end of the valve body is provided with second connecting holes corresponding to the first connecting holes, double-headed studs are arranged in the first connecting holes and the second connecting holes, and nuts are arranged on the upper end of the double-headed studs to connect and fix the valve body and the valve cover.

6. A single seat control valve according to claim 5, wherein: The valve core is a cylindrical structure, the upper and lower sides of the middle part are respectively provided with extension bosses, the middle part of the valve core is also provided with a step hole, the lower end of the valve rod is provided with a threaded connector, the outer diameter of the threaded connector is smaller than the outer diameter of the valve rod, the valve rod is arranged in the step hole of the valve core through the threaded connector, the threaded connector passes through the step hole and is provided with a nut on the threaded connector, and the nut is arranged between the valve core and the threaded connector.

7. A single seat control valve as claimed in claim 1, wherein: The outer side of the upper sealing step and the lower sealing step is provided with a slope, the upper and lower ends of the valve core are respectively provided with corresponding inclined surfaces, when the valve core closes the communication port, the inclined surfaces of the upper and lower ends of the valve core form a sealing structure with the slope arranged on the outer side of the upper sealing step and the lower sealing step respectively.

8. A single seat control valve according to claim 7, characterized in that: The upper end of the valve core is also provided with a trapezoidal groove at the position of the inclined surface.

9. The single seat control valve of claim 1, wherein: The middle part of the valve cover is provided with a slide, the valve rod is arranged in the slide, the upper end of the slide is provided with an expanded hole, the expanded hole is filled with filler, and the upper end of the expanded hole is provided with a pressing plate.

10. A single seat control valve according to claim 9, characterized in that: The upper end of the valve rod is provided with a threaded column, the threaded column is provided with an indicating part and a nut, and the upper and lower sides of the indicating part are respectively provided with a nut to fix the indicating part.

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