A high-pressure balanced regulating valve

Abstract

The present invention discloses a high-pressure balanced regulating valve for protecting the sealing structure of a high-pressure balanced regulating valve, belonging to the technical field of valves; the structure includes a valve body, a lower valve body, a valve cage seat and a valve core. A combined seal is provided on the valve core. The combined seal is a multi-ring seal structure arranged around the valve core. A guide groove is formed on the outer periphery of the valve core, and a guide collar is arranged in the guide groove. The present invention can effectively protect the smooth surface of the valve cage seat, prevent small particles from entering the inside of the sealing ring, extend the service life of the valve, and ensure the long-term operation of the entire system.

Description

Technical Field

[0001] A high-pressure balanced regulating valve is used to protect the sealing structure of the high-pressure balanced regulating valve and belongs to the technical field of valves. Background Art

[0002] Balanced regulating valves are widely used, and there are many types of seals for the balanced structure. There are packing seals, O-ring seals, and seals that rely on the reverse of the medium pressure, etc. However, these sealing methods cannot effectively protect the sealed position. Because during the use of the valve, some debris, such as some small particles, will be carried in the fluid medium, and the sealed position is very vulnerable. Even a slight scratch will prevent effective sealing. Especially in high-pressure urea plants, once the fluid medium corrodes the valve internals, the surface of the internals will become rough. At this time, as long as the valve moves up and down, the sealing ring will be damaged, seriously affecting the service life of the valve. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-pressure balanced regulating valve that can effectively protect the smooth surface of the valve cage seat, prevent small particles from entering the inside of the sealing ring, extend the service life of the valve, and ensure the long-term operation of the entire system.

[0004] The technical solution adopted by the present invention is as follows:

[0005] To achieve the above purpose, the present invention provides a high-pressure balanced regulating valve, including an upper valve body, a lower valve body, a valve cage seat, and a valve core. A combined seal is provided on the valve core. The combined seal is a multi-ring seal structure arranged around the valve core. A guide groove is opened on the outer periphery of the valve core, and a guide sleeve ring is arranged in the guide groove.

[0006] Preferably, a first seal groove, a second seal groove, and a third seal groove are sequentially opened on the outer periphery of the valve core. A first seal ring, a second seal ring, and a third seal ring are respectively arranged in the first seal groove, the second seal groove, and the third seal groove. The guide groove is arranged between the first seal groove and the second seal groove.

[0007] Preferably, the position of the first seal ring when the valve is fully opened is lower than the position of the guide sleeve ring when the valve is fully closed. At the same time, the position of the second seal ring when the valve is fully opened is lower than the position of the third seal ring when the valve is fully closed.

[0008] Preferably, an inlet flow channel is opened at the bottom of the valve cage seat, an outlet flow channel is opened on the side of the valve cage seat, a lower valve body flow channel is opened on the lower valve body, and a valve body flow channel is opened on the upper valve body.

[0009] Preferably, the lower part of the upper valve body and the lower valve body are connected together by bolts.

[0010] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0011] 1. By providing the first sealing ring, the second sealing ring and the third sealing ring to form a combined sealing structure, and cooperating with the guiding collar, a protection area can be formed, thereby effectively protecting the area on the inner wall of the valve cage seat in contact with the second sealing ring and the guiding collar, effectively protecting the smooth surface of the valve cage seat, preventing small particles from entering the inside of the sealing ring, extending the service life of the valve, and ensuring the long-term operation of the entire system.

[0012] 2. By providing the first sealing ring, the second sealing ring and the third sealing ring to form a combined sealing structure, and cooperating with the guiding collar, the first sealing ring and the third sealing ring can protect the second sealing ring and the guiding collar, solving the technical problem that the sealing ring is easily damaged and cannot form an effective seal, and extending the service life of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0014] Figure 1 is a schematic diagram of the overall structure of a balanced control valve;

[0015] Figure 2 is a schematic diagram of the structure of the valve in different states, where a is the schematic diagram of the valve in the fully closed state; b is the schematic diagram of the valve in the fully open state.

[0016] The labels in the figure are: 1 - upper valve body, 101 - valve body flow channel, 2 - lower valve body, 201 - lower valve body flow channel, 3 - bolt, 4 - valve cage seat, 5 - valve core, 501 - first sealing groove, 502 - guiding groove, 503 - second sealing groove, 504 - third sealing groove, 6 - inlet flow channel, 7 - outlet flow channel, 8 - combined seal, 801 - first sealing ring, 802 - second sealing ring, 803 - third sealing ring, 9 - guiding collar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1

[0019] Refer to Figures 1 - 2, this embodiment provides a high-pressure balanced control valve, which includes an upper valve body 1, a valve cage seat 4 and a valve core 5. The lower part of the upper valve body 1 and the lower valve body 2 are connected together by bolts 3. The valve cage seat 4 is arranged inside the upper valve body 1. An inlet flow channel 6 is opened at the bottom of the valve cage seat 4, and an outlet flow channel 7 is opened on the side of the valve cage seat 4. A lower valve body flow channel 201 is opened on the lower valve body 2, and a valve body flow channel 101 is opened on the upper valve body 1. The valve core 5 is arranged inside the valve cage seat 4;

[0020] A combined seal 8 is arranged on the valve core 5, and a smooth surface in contact with the combined seal 8 is arranged on the inner wall of the valve cage seat 4. The combined seal 8 is a multi-ring seal structure arranged around the valve core 5, including a first sealing ring, a second sealing ring and a third sealing ring. First sealing grooves 501, second sealing grooves 503 and third sealing grooves 504 are sequentially opened on the outer periphery of the valve core 5. The first sealing ring 801, the second sealing ring 802 and the third sealing ring 803 are correspondingly arranged in the first sealing groove 501, the second sealing groove 503 and the third sealing groove 504; A guiding groove 502 is also opened on the outer periphery of the valve core 5. The guiding groove 502 is arranged between the first sealing groove 501 and the second sealing groove 503. A guiding collar 9 is arranged in the guiding groove 502. The guiding groove 502 and the guiding collar 9 can play a role in fixing the valve core 5 and the valve cage seat 4 to keep the same center, so as to ensure the sealing effect.

[0021] In the present invention, since there are a total of three seals and one guide, when the valve is fully opened, the position of the first sealing ring 801 is lower than the position of the guiding collar 9 when the valve is fully closed. At the same time, when the valve is fully opened, the position of the second sealing ring 802 is lower than the position of the third sealing ring 803 when the valve is fully closed. In this way, a protection area is formed on the inner wall of the valve cage seat (as Figure 2 shown). The existence of this protection area can protect the inner wall of the valve cage seat within the protection area during the operation of the valve; when the valve is fully closed, the medium is blocked outside by the first sealing ring 801 and the third sealing ring 803. When the valve is fully open, it is also blocked outside by the first sealing ring 801 and the third sealing ring 803. The second sealing ring 802 and the guiding collar 9 are always inside. In this way, the first sealing ring 801 and the third sealing ring 803 can protect the second sealing ring 802 and the guiding collar 9, solve the technical problem that the sealing ring is easily damaged and cannot form an effective seal, and extend the service life of the sealing ring.

[0022] By designing the first sealing ring 801, the second sealing ring 802 and the third sealing ring 803 to form a combined sealing structure, and cooperating with the guide collar 9 at the same time, it is possible to effectively protect the entire area where the inner wall of the valve cage seat 4 contacts the second sealing ring 802 and the guide collar 9, effectively protect the smooth surface of the valve cage seat 4, and prevent small particles from entering the inside of the sealing ring, extend the service life of the valve, and ensure the long-term operation of the entire system.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A high-pressure balanced control valve, comprising an upper valve body (1), a lower valve body (2), a valve cage seat (4) and a valve core (5), characterized in that, a combined seal (8) is provided on the valve core (5), the combined seal (8) is a multi-ring seal structure arranged around the valve core (5), a guide groove (502) is formed on the outer periphery of the valve core (5), and a guide collar (9) is arranged in the guide groove (502); a first seal groove (501), a second seal groove (503) and a third seal groove (504) are sequentially formed on the outer periphery of the valve core (5), a first sealing ring (801), a second sealing ring (802) and a third sealing ring (803) are correspondingly arranged in the first seal groove (501), the second seal groove (503) and the third seal groove (504), and the guide groove (502) is arranged between the first seal groove (501) and the second seal groove (503); the position of the first sealing ring (801) when the valve is fully open is lower than the position of the guide collar (9) when the valve is fully closed. At the same time, the position of the second sealing ring (802) when the valve is fully open is lower than the position of the third sealing ring (803) when the valve is fully closed; an inlet flow channel (6) is formed at the bottom of the valve cage seat (4), an outlet flow channel (7) is formed on the side of the valve cage seat (4), a lower valve body flow channel (201) is formed on the lower valve body (2), and a valve body flow channel (101) is formed on the upper valve body (1).

2. A high-pressure balanced control valve according to claim 1, characterized in that, the lower part of the upper valve body (1) and the lower valve body (2) are connected together by bolts (3).

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