Proportional pressure reducing valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a proportional pressure reducing valve. The utility model provides a proportional pressure reducing valve capable of realizing stable adjustment of smaller pressure. The check valve comprises a valve body and a valve core, a valve cavity is arranged in the valve body, an inlet and an outlet of the valve body are communicated with the valve cavity and are not concentric, the check valve is characterized in that a branch cylinder is arranged in the valve cavity, the inlet of the valve body is communicated with the inside of the branch cylinder, and the outlet of the valve body corresponds to the outside of the branch cylinder; an overflowing hole for communicating the inside and the outside of the branch cylinder is formed in the branch cylinder; the valve element is arranged in the supporting cylinder, and an upper seal is arranged between the upper portion of the valve element and the supporting cylinder. Inclined plane seals matched with each other are arranged between the lower end of the valve core and the valve cavity; and the sealing section area between the upper seal and the inclined plane seal of the valve core can completely cover the area, provided with the overflowing hole, of the supporting cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically relates to a proportional pressure reducing valve. Background Technology

[0002] Pressure reducing valves are important control components in fluid transport systems, controlling the flow rate and on / off state of the medium in pipelines. However, in existing technologies, large-diameter proportional pressure reducing valves cannot achieve stable regulation of flow and pressure at lower pressures, resulting in the inability to regulate the specified outlet pressure or significant fluctuations. Summary of the Invention

[0003] This invention addresses the aforementioned problems by providing a proportional pressure reducing valve that can achieve stable regulation of relatively low pressure.

[0004] To achieve the above-mentioned objectives of this utility model, the present utility model adopts the following technical solution: the present utility model includes a valve body and a valve core, the valve body is a valve cavity, the inlet and outlet of the valve body are connected to the valve cavity and are not concentrically arranged, characterized in that: a support cylinder is provided in the valve cavity, the inlet of the valve body is connected to the inside of the support cylinder, and the outlet of the valve body corresponds to the outside of the support cylinder; a flow hole is provided on the support cylinder to connect the inside and outside of the support cylinder; the valve core is disposed in the support cylinder, and an upper seal is provided between the upper part of the valve core and the support cylinder; a mutually cooperating inclined seal is provided between the lower end of the valve core and the valve cavity; the sealing section area between the upper seal and the inclined seal of the valve core can completely cover the area of ​​the support cylinder where the flow hole is provided.

[0005] As a preferred embodiment of this utility model, a valve stem is provided above the valve body, and the valve stem is connected to the valve core; a pressure reducing hole is provided inside the valve core, and the pressure reducing hole connects the rod-side chamber and the rodless chamber inside the valve cavity.

[0006] As another preferred embodiment of this utility model, a balancing cavity is provided between the support cylinder and the inner wall of the valve body, and the balancing cavity is connected to the outlet of the valve body.

[0007] As a third preferred embodiment of this utility model, a valve cover is provided on the upper part of the valve body, and the valve stem passes through the valve cover and is connected to the valve core; a packing sealing assembly is provided on the upper part of the valve cover, and the lower end of the valve cover is connected to the valve body through a flange structure; a sealing ring is provided between the support cylinder and the valve body, and a gasket is provided between the support cylinder and the valve cover.

[0008] Furthermore, a bracket is provided above the valve cover, and the valve stem passes through the inside of the bracket; an anti-rotation groove is provided on one side of the valve stem, and an anti-rotation shaft and screw that cooperate with the anti-rotation groove are provided on the bracket.

[0009] Furthermore, a handwheel is provided at the upper end of the valve stem.

[0010] The beneficial effects of this utility model are as follows: 1. Achieving stable proportional regulation of outlet pressure: This utility model achieves step-by-step pressure reduction of the medium during the flow process by using the cooperation between the valve core and the support cylinder and the throttling orifice on the support cylinder, effectively solving the technical problems of low regulation accuracy and large outlet pressure fluctuation of large-diameter proportional pressure reducing valves.

[0011] 2. The present invention has a compact structure, is easy to install and maintain, has high production and assembly efficiency, and is suitable for a variety of industrial application environments.

[0012] 3. Inlet and outlet eccentric design to optimize media flow path: The valve body's inlet and outlet are designed with eccentric structures, which helps guide the fluid to flow eccentrically, optimize the flow field distribution, reduce eddies, and improve fluid throughput. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the support cylinder structure.

[0015] Figure 3 This is a schematic diagram of the valve core.

[0016] In the attached diagram, 1 is the handwheel, 2 is the valve stem nut, 3 is the upper pressure cap, 4 is the bracket, 5 is the screw, 6 is the anti-rotation shaft, 7 is the valve stem, 8 is the cotter pin, 9 is the upper seal, 10 is the support cylinder, 11 is the valve core, 12 is the valve body, 13 is the sealing ring, 14 is the gasket, 15 is the valve cover, 16 is the packing, 17 is the packing gland, 18 is the balance chamber, 19 is the sealing bevel, 20 is the valve cavity, 21 is the pressure reducing hole, and 22 is the flow passage hole. Detailed Implementation

[0017] This utility model includes a valve body 12 and a valve core 11. The valve body 12 contains a valve cavity 20. The inlet and outlet of the valve body 12 are connected to the valve cavity 20 and are not concentrically arranged. A support cylinder 10 is provided inside the valve cavity 20. The inlet of the valve body 12 is connected to the inside of the support cylinder 10, and the outlet of the valve body 12 corresponds to the outside of the support cylinder 10. A flow hole is provided on the support cylinder 10 to connect the inside and outside of the support cylinder 10. The valve core 11 is disposed inside the support cylinder 10. An upper seal 9 is provided between the upper part of the valve core 11 and the support cylinder 10. A beveled seal is provided between the lower end of the valve core 11 and the valve cavity 20. The sealing section area between the upper seal 9 and the beveled seal of the valve core 11 can completely cover the area of ​​the support cylinder 10 where the flow hole is provided. During valve opening or throttling regulation, the medium flows quantitatively through the flow hole of the support cylinder 10; the upper and lower sealing structures work together to ensure complete coverage of the flow hole inside the support cylinder 10 in the closed state, avoiding internal leakage, improving the accuracy of pressure reduction control and sealing performance, and improving the fluid flow field and reducing local scouring through the eccentric design of the valve body 12 inlet and outlet.

[0018] A valve stem 7 is disposed above the valve body 12, and the valve stem 7 is connected to the valve core 11. A pressure reducing hole 21 is disposed inside the valve core 11, and the pressure reducing hole 21 connects the rod chamber and the rodless chamber in the valve cavity 20. By setting the pressure reducing hole 21 to connect the rod chamber and the rodless chamber, the pressure difference between the two ends of the valve core 11 is balanced, which helps to reduce the operating torque and reduce the water hammer effect, thereby improving control stability and service life.

[0019] A balancing chamber 18 is provided between the inner wall of the support cylinder 10 and the valve body 12, and the balancing chamber 18 is connected to the outlet of the valve body 12. During valve operation, the balancing chamber 18 is connected to the outlet, which can reduce the problem of unbalanced force on the valve core 11, improve the stability of system operation, and extend the service life of the sealing pair.

[0020] A valve cover 15 is provided on the upper part of the valve body 12, and the valve stem 7 passes through the valve cover 15 and is connected to the valve core 11. A packing 16 sealing assembly is provided on the upper part of the valve cover 15, and the lower end of the valve cover 15 is connected to the valve body 12 through a flange structure. A sealing ring 13 is provided between the support cylinder 10 and the valve body 12, and a gasket 14 is provided between the support cylinder 10 and the valve cover 15. The combination of multiple sealing structures enhances the sealing reliability and prevents media leakage.

[0021] A bracket 4 is provided above the valve cover 15, and the valve stem 7 passes through the inside of the bracket 4. An anti-rotation groove is provided on one side of the valve stem 7, and an anti-rotation shaft 6 and a screw 5 that cooperate with the anti-rotation groove are provided on the bracket 4. The anti-rotation structure prevents the valve stem 7 from rotating and deviating during the adjustment process, making the up-and-down movement of the valve core 11 more precise and reliable, ensuring the stability and repeatability of the linear adjustment process, and improving the safety of use.

[0022] A handwheel 1 is provided at the upper end of the valve stem 7. The handwheel 1 is designed for easy manual operation, enabling precise control of the valve opening without the need for an external power source, and is suitable for various industrial field adjustment applications.

[0023] Example: As shown in the figure, this utility model includes a handwheel 1, a valve stem nut 2, an upper pressure cover 3, a bracket 4, a screw 5, an anti-rotation shaft 6, a valve stem 7, a cotter pin 8, a support cylinder 10, a valve core 11, a valve body 12, a sealing ring 13, a gasket 14, and a packing gland 17. The valve body 12 has inlet and outlet channels at both ends. The valve cavity 20 contains the support cylinder 10 and the valve core 11. The upper end of the valve core 11 is connected and fixed to the valve stem 7 via the cotter pin 8. The valve cover 15 is connected and fixed to the valve body 12 via flange bolts. The lower end of the bracket 4 is connected to the valve cover 15, and the valve stem 7 passes through its interior. The handwheel 1 rotates in conjunction with the valve stem nut 2 to control the raising and lowering of the valve stem 7.

[0024] The handwheel 1 is designed with an internal hexagonal structure and is fixed to the valve stem nut 2 by the nut.

[0025] The valve stem nut 2 is located in the inner hole at the upper end of the bracket 4. Its inner trapezoidal thread structure mates with the external thread of the valve stem 7, and it is fixed to the external gland 3.

[0026] The upper side of the bracket 4 has a screw hole 5, and the lower internal thread structure is fixed to the valve cover 15 with the external thread.

[0027] The valve stem 7 is controlled to rise and fall by engaging with the valve stem nut 2 through the upper trapezoidal thread. Its keyway engages with the anti-rotation shaft 6 in the inner hole on one side of the bracket 4 to prevent rotation.

[0028] The lower end of the valve stem 7 has a side hole, which fits into the inner hole of the valve core 11 and passes through the cotter pin 8 for fixation.

[0029] The support cylinder 10 is located inside the valve cavity 20 of the valve body 12. The upper outer circle is provided with a sealing ring groove, and the lower inner stop is matched with the convex stop of the inner cavity of the valve body 12.

[0030] The valve core 11 is located inside the support cylinder 10, with a sealing ring groove on the upper outer circle and a sealing inclined surface 19 at the lower end that cooperates with the sealing inclined surface 19 of the valve body 12 for sealing.

[0031] The valve body 12 has non-concentric inlet and outlet channels at both ends, a threaded hole at the upper end of the valve body 12, a sealing bevel 19 in the valve cavity 20 of the valve body 12, and a recessed stop on the flange end face at the upper end of the valve body 12, which is sealed by the gasket 14 and the valve cover 15.

[0032] The upper inner cavity of the valve cover 15 is the inner hole of the stuffing box, which cooperates with the packing 16 to ensure a seal; the inner hole of the packing gland 17 cooperates with the valve cover 15, and the lower end cooperates with the packing 16 to press and ensure a seal.

[0033] The working process of this invention will be explained below with reference to the diagrams.

[0034] The medium enters through one inlet end. At this time, the valve opening is adjusted by handwheel 1, and the medium will flow out through the throttling hole at the lower end of the support cylinder 10, thereby controlling the flow rate, pressure and blocking of the medium.

[0035] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A proportional pressure reducing valve, comprising a valve body (12) and a valve core (11), wherein the valve body (12) contains a valve cavity (20), and the inlet and outlet of the valve body (12) are connected to the valve cavity (20) and are not concentrically arranged, characterized in that: A support cylinder (10) is provided inside the valve cavity (20). The inlet of the valve body (12) is connected to the inside of the support cylinder (10), and the outlet of the valve body (12) is corresponding to the outside of the support cylinder (10). A flow hole (22) connecting the inside and outside of the support cylinder (10) is provided on the support cylinder (10). The valve core (11) is provided inside the support cylinder (10), and an upper seal (9) is provided between the upper part of the valve core (11) and the support cylinder (10). A mutually cooperating inclined seal is provided between the lower end of the valve core (11) and the valve cavity (20). The sealing section area between the upper seal (9) and the inclined seal of the valve core (11) can completely cover the area of ​​the support cylinder (10) where the flow hole (22) is provided.

2. The proportional pressure reducing valve according to claim 1, characterized by: A valve stem (7) is provided above the valve body (12), and the valve stem (7) is connected to the valve core (11); a pressure reducing hole (21) is provided inside the valve core (11), and the pressure reducing hole (21) connects the rod chamber and the rodless chamber inside the valve cavity (20).

3. The proportional pressure reducing valve according to claim 1, characterized by: A balance chamber (18) is provided between the inner wall of the support cylinder (10) and the valve body (12), and the balance chamber (18) is connected to the outlet of the valve body (12).

4. The proportional pressure reducing valve according to claim 1, characterized by: The valve body (12) is provided with a valve cover (15) on the upper part, and the valve stem (7) passes through the valve cover (15) and is connected to the valve core (11); the valve cover (15) is provided with a packing (16) sealing assembly on the upper part, and the lower end of the valve cover (15) is connected to the valve body (12) through a flange structure; a sealing ring (13) is provided between the support cylinder (10) and the valve body (12), and a gasket (14) is provided between the support cylinder (10) and the valve cover (15).

5. The proportional pressure reducing valve according to claim 4, characterized in that: A bracket (4) is provided above the valve cover (15), and the valve stem (7) passes through the inside of the bracket (4); an anti-rotation groove is provided on one side of the valve stem (7), and an anti-rotation shaft (6) and screw (5) that cooperate with the anti-rotation groove are provided on the bracket (4).

6. The proportional pressure reducing valve according to claim 4, characterized in that: A handwheel (1) is provided at the upper end of the valve stem (7).

Images