Balanced single-seat regulating valve

Abstract

The utility model relates to a balancing single-seat regulating valve, which comprises a valve body, an upper valve cover, a valve cage component, a valve core and a valve rod, the valve cage component comprises a guide valve cage, a pressing cage and a valve seat which are sequentially connected from top to bottom, and a sealing ring arranged between the guide valve cage and the pressing cage, and the valve core is hermetically connected with the pressing cage through the sealing ring. When the regulating valve is in a closed state, the valve element and the valve seat are connected in a sealing mode, and the valve element and the valve seat serve as a main sealing structure and are used for disconnecting flowing of media between the liquid inlet cavity and the liquid outlet cavity. Meanwhile, the valve element is in sealed connection with the pressing cage through the sealing ring, and the valve element and the pressing cage serve as an auxiliary sealing structure and are used for disconnecting flowing of media between the balance cavity and the liquid outlet cavity, so that leakage of the media in the valve is avoided, and tight closing of the valve is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to a balanced single-seat regulating valve. Background Art

[0002] A control valve is a valve used to adjust process parameters such as medium flow, pressure, temperature, liquid level, etc. in the field of industrial automation process control. In the fields of petroleum, petrochemical, power generation, new energy, coal chemical industry, fine chemical industry, etc., high pressure and high pressure difference working conditions have extremely high requirements on the leakage level of the control valve.

[0003] The traditional single-seat regulating valve includes a valve body, a valve cage and a valve core arranged in the valve body. When the regulating valve is closed, the pressure difference on both sides of the valve core is too large, resulting in leakage of the regulating valve, which does not meet the requirements of strict leakage. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a balanced single-seat regulating valve, including a valve body, an upper valve cover, a valve cage assembly, a valve core and a valve stem, the valve body is detachably connected to the upper valve cover, the valve body is provided with a liquid inlet chamber and a liquid outlet chamber, and a valve cage assembly is provided between the valve body and the upper valve cover, the valve cage assembly is connected to a valve core for controlling the flow of the medium, the valve core is slidably connected to the upper valve cover through the valve stem, a balancing chamber is formed between the valve core and the upper valve cover, and the valve core is provided with a balancing hole connecting the liquid inlet chamber and the balancing chamber, the valve cage assembly includes a guide valve cage, a pressure cage and a valve seat connected in sequence from top to bottom, and a sealing ring provided between the guide valve cage and the pressure cage, and the valve core is sealed and connected to the pressure cage through the sealing ring.

[0005] By adopting the above technical scheme, when the regulating valve is in a closed state or an open state, the pressure difference between the upper and lower sides of the valve core is adjusted through the balancing hole, so that the valve core moves smoothly; when the regulating valve is in a closed state, the valve core is sealed to the valve seat, and the two serve as the main sealing structure to disconnect the flow of the medium between the liquid inlet chamber and the liquid outlet chamber; at the same time, the valve core is sealed to the pressure cage through a sealing ring, and the two serve as a secondary sealing structure to disconnect the flow of the medium between the balancing chamber and the liquid outlet chamber, thereby avoiding leakage of the medium in the valve and achieving tight shut-off of the valve.

[0006] The utility model is further configured such that the guide valve cage and the pressure cage are provided with inner holes adapted to the valve core, the pressure cage is provided with side holes communicated with the inner holes, and a sealing groove with an opening direction facing inward is formed between the guide valve cage and the pressure cage, and the sealing ring is clamped in the sealing groove.

[0007] Furthermore, the valve core is provided with a center hole and a threaded hole arranged above the center hole, the valve stem is threadedly connected to the valve core through the threaded hole, and the valve core is provided with balancing holes distributed in a circumference, and the balancing holes are connected to the center hole.

[0008] By adopting the above technical solution, the medium in the liquid inlet chamber flows from the central hole through the surrounding balancing holes to the balancing chamber, thereby balancing the pressure difference between the liquid inlet chamber and the balancing chamber, avoiding the opening of the valve core due to excessive hydraulic pressure in the liquid inlet chamber, and improving the sealing effect of the valve.

[0009] The utility model is further configured that the side surface of the valve core is provided with a cylindrical guide surface for sliding connection to the valve cage, a conical sealing surface for sealing connection to the pressure cage, and a flow curve surface for controlling the flow of the medium.

[0010] By adopting the above technical solution, the cross-section of the flow curve surface is a parabola shape, which is used to facilitate the control of the flow of the medium. The conical sealing surface and the valve seat form a main sealing structure with a conical angle difference, and the cylindrical guide surface and the sealing ring on the valve cage form a sliding secondary sealing structure.

[0011] The utility model is further configured that an upper sealing member is provided between the guide valve cage and the upper valve cover, and a lower sealing member is provided between the valve seat and the valve body.

[0012] Furthermore, the upper valve cover is provided with a stuffing box, and the valve stem is slidably connected to the upper valve cover via the stuffing box.

[0013] By adopting the above technical solution, the sealing effect of the upper and lower ends of the valve cage assembly is improved through the upper seal and the lower seal, and the valve stem is connected to the upper valve cover in a sliding seal through the stuffing box to avoid leakage of the internal medium of the regulating valve.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] When the regulating valve is in a closed state, the valve core is sealed to the valve seat, and the two serve as the main sealing structure to disconnect the flow of the medium between the liquid inlet chamber and the liquid outlet chamber; at the same time, the valve core is sealed to the pressure cage through a sealing ring, and the two serve as secondary sealing structures to disconnect the flow of the medium between the balance chamber and the liquid outlet chamber, thereby avoiding leakage of the medium in the valve and achieving tight shut-off of the valve.

[0016] The embodiments of the utility model are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural sectional view of the utility model;

[0018] Figure 2 This is a structural cross-sectional view of the valve core of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the valve core of the utility model when it is under pressure;

[0020] Among them: 1-valve body, 2-upper valve cover, 3-valve cage assembly, 4-valve core, 5-valve stem, 7-upper seal, 8-lower seal, 9-stuffing box, 11-liquid inlet chamber, 12-liquid outlet chamber, 13-balance chamber, 31-guide valve cage, 32-pressure cage, 33-valve seat, 34-sealing ring, 41-balance hole, 42-center hole, 43-threaded hole, 44-cylindrical guide surface, 45-conical sealing surface, 46-flow curve surface, 321-inner hole, 322-side hole, 323-sealing groove; DETAILED DESCRIPTION

[0021] like Figure 1 As shown, this embodiment provides a balanced single-seat regulating valve, including a valve body 1, an upper valve cover 2, a valve cage assembly 3, a valve core 4 and a valve stem 5. The valve body 1 is detachably connected to the upper valve cover 2. The valve body 1 is provided with a liquid inlet chamber 11 and a liquid outlet chamber 12, and a valve cage assembly 3 is provided between the valve body 1 and the upper valve cover 2. The valve cage assembly 3 is connected to a valve core 4 for controlling the flow of a medium. The valve core 4 is slidably connected to the upper valve cover 2 through the valve stem 5. A balancing chamber 13 is formed between the valve core 4 and the upper valve cover 2, and the valve core 4 is provided with a balancing hole 41 connecting the liquid inlet chamber 11 and the balancing chamber 13. The valve cage assembly 3 includes a guide valve cage 31, a pressure cage 32 and a valve seat 33 connected in sequence from top to bottom, and a sealing ring 34 provided between the guide valve cage 31 and the pressure cage 32. The valve core 4 is sealed and connected to the pressure cage 32 through the sealing ring 34.

[0022] Combination Figure 2 , 3 As shown, in this embodiment, the guide valve cage 31 and the pressure cage 32 are provided with an inner hole 321 adapted to the valve core 4, the pressure cage 32 is provided with a side hole 322 connected with the inner hole 321, and a sealing groove 323 with an opening direction facing inward is formed between the guide valve cage 31 and the pressure cage 32, and the sealing ring 34 is clamped in the sealing groove 323. The valve core 4 is provided with a center hole 42 and a threaded hole 43 provided above the center hole 42. The valve stem 5 is threadedly connected to the valve core 4 through the threaded hole 43. The valve core 4 is provided with balancing holes 41 distributed in a circumference, and the balancing holes 41 are connected with the center hole 42. The medium in the liquid inlet chamber 11 flows from the center hole 42 to the balancing chamber 13 through the balancing holes 41 around it, thereby balancing the pressure difference between the liquid inlet chamber 11 and the balancing chamber 13, avoiding the valve core 4 from opening due to excessive hydraulic pressure in the liquid inlet chamber 11, so as to improve the sealing effect of the valve.

[0023] In this embodiment, the side of the valve core 4 is provided with a cylindrical guide surface 44 for sliding connection to the pressure cage 32, a conical sealing surface 45 for sealingly connecting to the valve seat 33, and a flow curve surface 46 for controlling the flow of the medium. The cross-section of the flow curve surface 46 is a parabola shape, which is used to facilitate the control of the flow of the medium. The conical sealing surface 45 and the valve seat 33 form a main sealing structure with a conical angle difference, and the cylindrical guide surface 44 and the sealing ring 34 on the valve cage form a sliding secondary sealing structure.

[0024] In this embodiment, an upper sealing member 7 is provided between the guide valve cage 31 and the upper valve cover 2, a lower sealing member 8 is provided between the valve seat 33 and the valve body 1, a stuffing box 9 is provided on the upper valve cover 2, and the valve stem 5 is slidably connected to the upper valve cover 2 through the stuffing box 9. The upper sealing member 7 and the lower sealing member 8 improve the sealing effect of the upper and lower ends of the valve cage assembly 3. The valve stem 5 is slidably and sealingly connected to the upper valve cover 2 through the stuffing box 9 to avoid leakage of the internal medium of the regulating valve.

[0025] The working principle of the utility model is that when the regulating valve is in a closed state or an open state, the pressure difference between the upper and lower sides of the valve core 4 is adjusted through the balancing hole 41, so that the valve core 4 moves smoothly; when the regulating valve is in a closed state, the valve core 4 is sealed and connected to the valve seat 33, and the two serve as the main sealing structure for disconnecting the flow of the medium between the liquid inlet chamber 11 and the liquid outlet chamber 12; at the same time, the valve core 4 is sealed and connected to the pressure cage 32 through the sealing ring 34, and the two serve as the secondary sealing structure for disconnecting the flow of the medium between the balancing chamber 13 and the liquid outlet chamber 12, thereby avoiding leakage of the medium in the valve and realizing tight shutoff of the valve.

[0026] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A balanced single-seat regulating valve, comprising a valve body (1), an upper valve cover (2), a valve cage assembly (3), a valve core (4) and a valve stem (5), wherein the valve body (1) is detachably connected to the upper valve cover (2), the valve body (1) is provided with a liquid inlet cavity (11) and a liquid outlet cavity (12), and a valve cage assembly (3) is provided between the valve body (1) and the upper valve cover (2), the valve cage assembly (3) is connected to a valve core (4) for controlling a medium flow, the valve core (4) is slidably connected to the upper valve cover (2) through the valve stem (5), a balancing cavity (13) is formed between the valve core (4) and the upper valve cover (2), and the valve core (4) is provided with a balancing hole (41) communicating the liquid inlet cavity (11) and the balancing cavity (13), wherein the valve core (4) is characterized in that: The valve cage assembly (3) comprises a guide valve cage (31), a pressure cage (32) and a valve seat (33) which are connected in sequence from top to bottom, and a sealing ring (6) arranged between the guide valve cage (31) and the pressure cage (32); the valve core (4) is sealedly connected to the pressure cage (32) via the sealing ring (6).

2. A balanced single-seat regulating valve according to claim 1, characterized in that: The guide valve cage (31) and the pressure cage (32) are provided with an inner hole (321) adapted to the valve core (4), the pressure cage (32) is provided with a side hole (322) connected to the inner hole (321), and a sealing groove (323) with an opening facing inward is formed between the guide valve cage (31) and the pressure cage (32), and the sealing ring (6) is clamped in the sealing groove (323).

3. A balanced single-seat regulating valve according to claim 2, characterized in that: The valve core (4) is provided with a center hole (42) and a threaded hole (43) arranged above the center hole (42); the valve stem (5) is threadedly connected to the valve core (4) through the threaded hole (43); the valve core (4) is provided with balancing holes (41) distributed in a circumference, and the balancing holes (41) are connected to the center hole (42).

4. A balanced single-seat regulating valve according to claim 3, characterized in that: The side surface of the valve core (4) is provided with a cylindrical guide surface (44) for sliding connection with the pressure cage (32), a conical sealing surface (45) for sealing connection with the valve seat (33), and a flow curve surface (46) for controlling the flow of the medium.

5. A balanced single-seat regulating valve according to claim 2, characterized in that: An upper sealing member (7) is provided between the guide valve cage (31) and the upper valve cover (2), and a lower sealing member (8) is provided between the valve seat (33) and the valve body (1).

6. A balanced single-seat regulating valve according to claim 2, characterized in that: The upper valve cover (2) is provided with a stuffing box (9), and the valve stem (5) is slidably connected to the upper valve cover (2) via the stuffing box (9).

Images