High-pressure-difference washing-free composite sealing regulating valve

Abstract

A high-pressure-difference washing-free composite sealing regulating valve is characterized in that a valve cage and a valve seat are vertically arranged in a valve chamber, the valve seat is arranged at the bottom of the valve chamber and provided with a throttling element, the throttling element is integrally arranged at the top of the valve seat, and a medium in an inflow channel of a valve body enters the valve chamber through the valve cage and is connected with an outflow channel through the throttling element; a pre-starting valve element is integrally arranged at the top of the valve rod, a main valve element is installed at the bottom of the valve rod, and a sealing face A is arranged between the tail end of the pre-starting valve element and the top of the main valve element. And the sealing surface B is arranged between the bottom of the main valve core and the bottom of the valve seat, and is arranged below the medium channel, so that the sealing surface is prevented from being scoured by the medium no matter what opening degree is, the use effect of the regulating valve can be improved, and the service life of the regulating valve is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of regulating valve technology, and specifically relates to a high pressure differential erosion-free composite sealing regulating valve. Background Technology

[0002] A control valve, also known as a regulating valve, is a final control element in industrial automation process control. It receives control signals from a regulating control unit and uses power to change process parameters such as flow rate, pressure, temperature, and level. Existing control valves generally include a valve body, valve seat, valve core, and valve stem. The valve body has a flow channel, the valve seat is located within the flow channel, and the valve core cooperates with the valve seat to open and close the flow channel. The valve stem drives the valve core. When the valve stem drives the valve core to open its stroke, the fluid medium flows from all sides towards the valve seat, making the sealing surfaces of the valve seat and valve core highly susceptible to erosion by the medium, thus affecting the performance and lifespan of the control valve.

[0003] The utility model disclosed in CN208565596U is an anti-erosion composite sealing steam trap. Its key technical features include a valve body with a vertically aligned valve stem mounted on it. A rotating wheel is installed at the top of the valve stem. A valve chamber is located within the valve body. The valve body has an inflow channel communicating with the side of the valve chamber and an outflow channel communicating with the bottom of the valve chamber. A valve cage and a valve seat are installed from top to bottom within the valve chamber. The medium in the inflow channel passes through the valve cage and enters the valve chamber. The valve seat is located at the bottom of the valve chamber and has a medium channel in the middle communicating with the outflow channel. A valve core is installed at the end of the valve stem, used to open and close the medium channel. While it primarily achieves a completely zero-leakage seal, the sealing surface is still susceptible to erosion by the medium.

[0004] Utility model CN215862014U discloses a cylindrical groove series-parallel hybrid throttling labyrinth disc structure for a high-pressure differential control valve. The key technical features include an upper disc, a middle disc, and a lower disc, with the middle disc positioned between the upper and lower discs. A single-sided blind hole is provided on the side of the upper disc facing the middle disc, and a single-sided blind hole is also provided on the side of the lower disc facing the middle disc. The middle disc has staggered blind holes on both sides. Utilizing the principle of throttling orifices and the combined effect of a meandering labyrinth flow path, the fluid first passes through a series channel, allowing its pressure to drop rapidly. Then, it undergoes uniform pressure reduction and deceleration through parallel flow channels, minimizing interference from the fluid at the disc outlet. Although it has a high pressure reduction stage and strong pressure reduction capacity, the valve seat and valve core sealing surfaces are easily eroded by the medium, affecting the valve's performance and lifespan. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a high-pressure differential pressure erosion-free composite sealing regulating valve, which avoids media erosion and extends the service life of the regulating valve.

[0006] To solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0007] A high-pressure differential non-flushing composite sealing regulating valve includes a valve body, a valve cover, and a valve stem arranged in a coordinated manner inside the two. The valve body is provided with a valve chamber, and the valve body is provided with an inflow channel communicating with the side of the valve chamber and an outflow channel communicating with the bottom of the valve chamber.

[0008] The valve chamber is also equipped with a valve cage and a valve seat. The valve seat is located at the bottom of the valve chamber and is integrally installed with a throttling device. The medium flowing into the valve body enters the valve chamber through the valve cage and is connected to the outflow channel through the throttling device.

[0009] The valve stem is also integrally provided with a pre-opening valve core at the top and a main valve core at the bottom. A sealing surface A is provided between the end of the pre-opening valve core and the balance hole at the top of the main valve core.

[0010] A sealing surface B is provided between the bottom of the main valve core and the bottom of the valve seat, located below the medium passage.

[0011] The sealing surface A is a conical seal, and the sealing surface B is a planar seal.

[0012] The throttling device and valve cage are both designed as windows or multi-stage pressure reducing structures depending on the operating conditions.

[0013] A flexible sealing ring is also provided between the valve seat and the inner wall of the valve chamber.

[0014] The main valve core has a balance hole.

[0015] The beneficial effects of this utility model are:

[0016] (1) The high pressure differential non-flushing composite sealing regulating valve has valve cages and valve seats installed in the valve chamber. The valve seat is located at the bottom of the valve chamber and a throttling device is installed. The throttling device is integrated on the top of the valve seat. The medium in the valve body flow channel enters the valve chamber through the valve cage and is connected to the flow channel through the throttling device. The top of the valve stem is integrated with a pre-opening valve core, and the bottom of the valve stem is equipped with a main valve core. A sealing surface A is provided between the end of the pre-opening valve core and the top of the main valve core. A sealing surface B is provided between the bottom of the main valve core and the bottom of the valve seat. The sealing surface B is located below the medium channel. Regardless of the opening degree, the sealing surface is protected from scouring by the medium, which can improve the performance and service life of the regulating valve.

[0017] (2) The throttling element is integrated on the top of the valve seat and can be made into a multi-hole or labyrinth multi-stage pressure reduction form according to the pressure difference requirement. It is flexible and can realize the rapid adjustment of the pressure difference. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] This utility model provides a high-pressure differential pressure, erosion-free composite sealing regulating valve, such as... Figure 1 and Figure 2 As shown.

[0022] A high-pressure differential non-flushing composite sealing regulating valve includes a valve body 1, a valve cover 2 mounted on the valve body 1, and a valve stem 3 vertically arranged inside the two. The valve body 1 is provided with a valve chamber 5. The valve body 1 is provided with an inflow channel 6 connected to the side of the valve chamber 5 and an outflow channel 7 connected to the bottom of the valve chamber.

[0023] The valve chamber 5 is also equipped with a valve cage 8 and a valve seat 9 from top to bottom. The valve seat 9 is located at the bottom of the valve chamber 5 and is integrally installed with a throttling device 10. The medium flowing into the valve body 1 into the channel 6 enters the valve chamber through the valve cage and is connected to the outlet channel 7 through the throttling device 10.

[0024] The valve stem 3 is also integrally provided with a pre-opening valve core 4 at its top, and a main valve core 11 is installed at the bottom of the valve stem 3. A sealing surface A is provided between the end of the pre-opening valve core 4 and the balance hole at the top of the main valve core 11. A sealing surface B is provided between the bottom of the main valve core 11 and the bottom of the valve seat 5, and the sealing surface B is located below the medium passage. Regardless of the opening degree, the sealing surface is protected from media erosion. In this embodiment, the sealing surface A is a conical seal, and the sealing surface B is a planar seal.

[0025] The throttling element 10 and the valve cage 8 can both be selected with a window or a multi-stage pressure reducing structure according to the working conditions.

[0026] To improve sealing, a flexible sealing ring is also provided between the valve seat 9 and the inner wall of the valve chamber 5.

[0027] The main valve core 11 has a balance hole. The pre-start valve core 4 is used to balance the upper and lower pressures of the main valve core 11, so that the main valve core 11 operates smoothly and the main valve core 11 adjusts the flow rate and pressure of the medium.

[0028] When the valve is closed, the valve stem 3 drives the pre-opening valve core 4 to move downward to close the sealing surface A. The valve stem 3 continues to move downward to compress the spring 12, causing the main valve core 11 to move downward to close the sealing surface B. The medium inflow channel 6 and the outflow channel 7 are disconnected. The greater the medium pressure in the inflow channel 6, the better the sealing effect.

[0029] When the valve is opened, the pre-opening valve core 4 opens to balance the pressure on the upper and lower parts of the main valve core 11, resulting in smooth operation. By changing the position of the main valve core 11 in the valve chamber 5, the area of ​​the channel on the throttling element 10 is changed, thereby changing the medium flow rate and pressure. The sealing surface B is located below the medium channel on the throttling element 10, which can prevent it from being eroded by the medium at any opening degree, thus improving the performance and life of the regulating valve.

[0030] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing this utility model and simplifying the description, and the above terms have no special meaning.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0032] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

Claims

1. A high-pressure-differential anti-washing combined seal regulating valve, comprising a valve body, a valve cover and a valve stem arranged vertically inside the valve body and the valve cover, and a valve chamber arranged inside the valve body, characterized in that: the valve body is provided with an inflow passage communicated with the side of the valve chamber and an outflow passage communicated with the bottom of the valve chamber; the valve chamber is further provided with a valve cage and a valve seat, the valve seat is arranged at the bottom of the valve chamber and integrally provided with a throttling member, the medium in the inflow passage of the valve body enters the valve chamber through the valve cage and is connected with the outflow passage through the throttling member; the top of the valve stem is further integrally provided with a pre-opening valve core, the bottom of the valve stem is provided with a main valve core, and a sealing surface A is arranged between the end of the pre-opening valve core and the balance hole at the top of the main valve core; a sealing surface B is arranged between the bottom of the main valve core and the bottom of the valve seat and below the medium passage. The sealing surface A is a conical sealing surface, and the sealing surface B is a planar sealing surface. The throttling member and the valve cage are provided with a window or a multi-stage pressure reduction structure according to the working condition. A flexible sealing ring is further arranged between the valve seat and the inner wall of the valve chamber. The main valve core is provided with a balance hole.

2. The high pressure drop, anti-flashing, composite seal control valve of claim 1, wherein: ​ 3. The high pressure drop, anti-flashing, composite seal control valve of claim 1, wherein: ​ 4. A high pressure drop, anti-flashing, composite seal control valve according to any one of claims 1 to 3, characterized in that: ​ 5. A high pressure drop, anti-flashing, composite seal control valve according to claim 4, wherein: ​

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