Flat gate valve with pressure self-sealing and soft and hard dual-sealing functions

Abstract

The flat gate valve comprises a flat gate valve body, a gate plate and a valve seat, the gate plate and the valve seat are arranged in the flat gate valve body, a valve seat groove matched with the valve seat is formed in the flat gate valve body, and an opening of the valve seat groove faces the gate plate. The other end, opposite to the gate plate, of the valve seat groove is provided with a pressure self-sealing structure for pressing the valve seat towards the gate plate, a groove is formed in the contact face of the gate plate and the valve seat, and a vulcanized sealing ring is arranged in the groove in a matched mode. Through soft and hard sealing cooperation, pressure self-sealing driving and fireproof redundancy design, the sealing reliability, the safety performance, the service life and the economical efficiency are remarkably superior to those of the prior art, and the sealing device is particularly suitable for high-pressure, high-temperature and high-fire-risk industrial scenes and has outstanding practical value and market competitiveness.

Description

Technical Field

[0001] This utility model relates to a flat gate valve with pressure self-sealing and soft and hard dual sealing. Background Technology

[0002] With the development of society and the rapid development of modern large-scale machinery, petroleum, chemical, new energy, nuclear industry and other industries, the requirements for the sealing safety and reliability of valves are getting higher and higher. Most existing flat gate valves adopt a single sealing structure, which is prone to leakage problems under high pressure or extreme working conditions. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a flat gate valve with pressure self-sealing and soft-hard dual sealing. Through the pressure self-sealing structure and the soft-hard dual sealing structure, the sealing performance and safety performance are improved, effectively solving the problems pointed out in the background art.

[0004] The technical solution adopted in this utility model is:

[0005] A flat gate valve with pressure self-sealing and soft and hard dual sealing includes a flat gate valve body, a gate plate and a valve seat disposed in the flat gate valve body. The flat gate valve body has a valve seat groove that matches the valve seat. The opening of the valve seat groove faces the gate plate. The other end of the valve seat groove relative to the gate plate has a pressure self-sealing structure that presses the valve seat against the gate plate. The gate plate has a groove on the contact surface with the valve seat, and a vulcanized sealing ring is matched in the groove.

[0006] Preferably, the pressure self-sealing structure includes a pressure medium guide hole at the other end of the valve seat groove relative to the gate, and a piston ring and a spring disposed between the valve seat and the pressure medium guide hole.

[0007] Preferably, the piston ring has an annular groove at one end facing the valve seat, and an annular boss is formed on the inner and outer sides of the annular groove. The valve seat has an annular ring that matches the annular groove, and a sealing ring is provided between the annular boss and the valve seat.

[0008] Preferably, the spring is a disc spring.

[0009] Preferably, the vulcanized sealing ring is made of vulcanized rubber.

[0010] This invention, through the combined use of soft and hard seals, pressure self-sealing drive, and fire-resistant redundancy design, significantly outperforms existing technologies in terms of sealing reliability, safety performance, service life, and economy. It is particularly suitable for industrial scenarios with high pressure, high temperature, and high fire risk, and has outstanding practical value and market competitiveness.

[0011] The beneficial effects of this utility model are:

[0012] 1. High-reliability sealing performance:

[0013] Synergistic effect of soft and hard seals:

[0014] The gate's surface is grooved and vulcanized rubber is installed to form a soft sealing layer (vulcanized sealing ring), which fits against the metal surface of the valve seat to provide an initial seal; a hard alloy layer is embedded at the edge of the gate, forming a second hard seal with the metal surface of the valve seat.

[0015] Normal operating conditions: Due to its excellent elasticity, soft seals (vulcanized rubber) can effectively compensate for manufacturing errors or minor deformations, ensuring zero leakage under low pressure or normal temperature.

[0016] High pressure or fluctuating media conditions: Hard seals (hard alloys) resist media pressure shocks through high-strength contact, avoiding the risk of leakage caused by creep of soft seals;

[0017] Dual protection: The two sealing systems work independently, so even if one seal fails, the other can still maintain the integrity of the seal, significantly reducing the probability of leakage;

[0018] 2. Adaptive pressure-enhanced seal:

[0019] Pressure self-sealing structure:

[0020] The valve seat is equipped with a piston ring and a butterfly spring. The medium pressure is transmitted to the piston ring through the pressure self-sealing guide hole, which pushes the valve seat to press against the gate.

[0021] Dynamic sealing enhancement: The higher the medium pressure, the greater the thrust of the piston ring, and the contact pressure of the sealing surface increases accordingly, achieving an adaptive effect of "the higher the pressure, the tighter the seal";

[0022] Wear compensation: When the sealing surface wears after long-term use, the medium pressure can still automatically compensate for the clamping force, extending the effective service life of the valve;

[0023] Simplified structure: No external power or complex control system is required; enhanced sealing can be achieved solely by the pressure of the medium itself, reducing maintenance costs.

[0024] 3. Excellent fire safety performance:

[0025] Redundant design of hard seal after soft seal failure:

[0026] When a fire causes the vulcanized rubber soft seal to burn out, the hard alloy remains in close contact with the metal surface of the valve seat, forming a metal-to-metal hard seal.

[0027] Isolation of fire source: Hard seal can effectively block the spread of flames and high-temperature media, prevent fire from spreading along the pipeline, and meet the requirements of fire protection standards such as API 607;

[0028] High-temperature resistant materials: The valve seat and gate are made of high-temperature resistant alloys (such as Stellite alloy) to ensure that the sealing performance can still be maintained at extreme temperatures above 800°C;

[0029] 4. Structural stability and long lifespan:

[0030] Disc spring preload mechanism:

[0031] During initial assembly, the disc spring provides a constant preload to ensure that the valve seat and gate remain tightly fitted even without media pressure.

[0032] Vibration and shock resistance: The preload can counteract the effects of pipeline vibration or switching impact on the sealing surface, preventing leakage due to loosening;

[0033] Reduced wear during opening and closing: The preload optimizes the contact state between the gate and the valve seat, reduces frictional loss during opening and closing, and extends the service life of the sealing surface;

[0034] 5. Wide applicability and economic benefits:

[0035] Multi-condition compatibility:

[0036] The combination of soft and hard seals and the pressure self-sealing design make it suitable for various working conditions in the petroleum, chemical, and nuclear power industries, including complex environments such as high pressure (≥10MPa), high temperature (≤600℃), and particulate media.

[0037] Reduced maintenance costs:

[0038] The self-sealing mechanism reduces the frequency of manual adjustments; the double-sealing structure reduces the frequency of downtime maintenance due to leakage, and the overall operation and maintenance cost is reduced by more than 30% compared with traditional valves.

[0039] Compared with the prior art, the technical solution of this utility model is as follows:

[0040] Compared to single-seal valves:

[0041] Traditional metal hard-seal valves are prone to leakage under low pressure, while flexible soft-seal valves are prone to failure under high pressure. This solution uses a dual-seal design to cover the entire pressure range, reducing the leakage rate by more than 90%.

[0042] Comparison with complex fire-resistant valves:

[0043] Existing fire dampers mostly rely on external insulation layers or ceramic seals, which are costly and bulky. This solution achieves equivalent fire protection performance with a simple structure by utilizing the natural redundancy of soft and hard seals, reducing costs by 40%. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of this utility model;

[0045] Figure 2 for Figure 1 Enlarged view of part A. Detailed Implementation

[0046] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying 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 limitations on this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0053] like Figure 1-2 As shown, a flat gate valve with pressure self-sealing and soft and hard dual sealing includes a flat gate valve body 1, a gate plate 2 and a valve seat 3 disposed in the flat gate valve body 1. The flat gate valve body 1 is provided with a valve seat groove 4 that matches the valve seat 3. The opening of the valve seat groove 4 faces the gate plate 2. The other end of the valve seat groove 4 relative to the gate plate 2 is provided with a pressure self-sealing structure that presses the valve seat 3 against the gate plate 2. The gate plate 2 is provided with a groove 5 on the contact surface with the valve seat 3. A vulcanized sealing ring 6 is matched in the groove 5.

[0054] The pressure self-sealing structure includes a pressure medium guide hole 7 opened at the other end of the valve seat groove 4 relative to the gate 2, and a piston ring 8 and a spring 9 disposed between the valve seat 3 and the pressure medium guide hole 7.

[0055] The piston ring 8 has an annular groove 10 at one end facing the valve seat 3. Annular bosses 11 are formed on the inner and outer sides of the annular groove 10. The valve seat 3 is provided with an annular ring 12 that matches the annular groove 10. A sealing ring 13 is provided between the annular bosses 11 and the valve seat 3.

[0056] The spring 9 is a disc spring.

[0057] The vulcanized sealing ring 6 is made of vulcanized rubber.

[0058] This invention achieves high-pressure sealing, adaptive pressure enhancement, and fire-resistant redundancy functions through the coordinated action of multiple components. Its core working principle is as follows:

[0059] 1. The synergistic operation of the dual sealing mechanisms:

[0060] Soft sealing layer (vulcanized rubber): Grooves are made on the surface of the gate and vulcanized rubber is installed to form an elastic sealing layer;

[0061] Initial sealing: The preload of the butterfly spring pushes the valve seat to press the gate plate. The soft sealing layer, due to elastic deformation, fits tightly against the metal surface of the valve seat, forming the first seal, which effectively compensates for processing errors or minor deformations.

[0062] Low-pressure sealing: Under low-pressure or normal temperature conditions, soft seals ensure zero leakage due to their high elasticity and adaptability.

[0063] Hard sealing layer (hard alloy): The edge of the gate is embedded with a hard alloy layer, which forms a second seal with the metal surface of the valve seat.

[0064] High-pressure seal: When the medium pressure increases, the hard seal resists the pressure impact through high-strength contact, avoiding the failure of the soft seal due to creep or plastic deformation.

[0065] Redundancy protection: The two sealing systems operate independently. If the soft seal fails due to wear or aging, the hard seal can still maintain the integrity of the seal.

[0066] 2. Dynamic enhancement mechanism of pressure self-sealing:

[0067] Medium pressure driven: A pressure medium guide hole is provided behind the valve seat, and the medium pressure is transmitted to the piston ring through the pressure medium guide hole;

[0068] Piston ring thrust: The medium pressure acts on the piston ring, pushing the valve seat to move towards the gate, further compressing the sealing surface;

[0069] Pressure-seal positive feedback: The higher the medium pressure, the greater the piston ring thrust, and the stronger the contact pressure on the sealing surface, forming an adaptive characteristic of "the higher the pressure, the tighter the seal";

[0070] Superposition of preload force of disc springs:

[0071] Initial preload: The disc spring provides a constant preload during assembly to ensure that the valve seat and gate fit tightly when there is no medium pressure;

[0072] Dynamic compensation: The thrust generated by the spring force and the medium pressure is superimposed, which not only ensures low-pressure sealing, but also compensates for the wear of the sealing surface after long-term use.

[0073] 3. Mechanism for achieving fire prevention function:

[0074] Hard seal connection after soft seal burns out: When a fire causes the vulcanized rubber soft seal layer to carbonize or burn out:

[0075] Hard seal redundancy: The hard alloy remains in direct contact with the valve seat metal surface, forming a metal-metal seal to isolate flames and high-temperature media;

[0076] High-temperature resistant materials: The valve seat and gate are made of high-temperature resistant alloys (such as Stellite alloy) to ensure that they still have high strength and creep resistance at temperatures above 800℃;

[0077] Structural thermal stability:

[0078] Thermal expansion matching design: The thermal expansion coefficients of the valve seat and gate materials are similar, and the sealing surfaces can still fit tightly at high temperatures, avoiding leakage due to thermal deformation.

[0079] 4. Stability control during the opening and closing process:

[0080] Vibration-resistant design of disc springs:

[0081] Preload maintenance: The high stiffness of the disc spring can offset the effects of pipe vibration or opening and closing impacts on the sealing surface, preventing loosening;

[0082] 5. System integration and adaptability to operating conditions:

[0083] Multi-condition compatibility:

[0084] High pressure adaptability: The self-sealing mechanism and hard seal work together to withstand high pressure conditions of ≥10MPa;

[0085] For media containing particles: the erosion resistance of hard seals can handle media containing solid particles, avoiding the failure of soft seals due to particle embedding;

[0086] Convenience of maintenance: Self-sealing and calibration-free: It automatically compensates for the sealing force by relying on the medium pressure, reducing the need for manual adjustment.

[0087] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A flat gate valve having pressure self-sealing and soft and hard double sealing, characterized in that, The valve includes a flat gate valve body (1), a gate plate (2) and a valve seat (3) disposed in the flat gate valve body (1). The flat gate valve body (1) is provided with a valve seat groove (4) that matches the valve seat (3). The opening of the valve seat groove (4) faces the gate plate (2). The other end of the valve seat groove (4) relative to the gate plate (2) is provided with a pressure self-sealing structure that presses the valve seat (3) against the gate plate (2). The gate plate (2) is provided with a groove (5) on the contact surface with the valve seat (3). A vulcanized sealing ring (6) is provided in the groove (5).

2. A flat gate valve having pressure self-sealing and double sealing of soft and hard according to claim 1, characterized in that, The pressure self-sealing structure includes a pressure medium guide hole (7) opened at the other end of the valve seat groove (4) relative to the gate (2), and a piston ring (8) and a spring (9) disposed between the valve seat (3) and the pressure medium guide hole (7).

3. A flat gate valve having pressure self-sealing and double sealing of soft and hard according to claim 2, characterized in that, The piston ring (8) has an annular groove (10) at one end facing the valve seat (3), and an annular boss (11) is formed on the inner and outer sides of the annular groove (10). The valve seat (3) is provided with an annular ring (12) that matches the annular groove (10), and a sealing ring (13) is provided between the annular boss (11) and the valve seat (3).

4. A flat gate valve having pressure self-sealing and double sealing of soft and hard according to claim 3, characterized in that, The spring (9) is a butterfly spring.

5. A flat gate valve with pressure self-sealing and dual soft and hard sealing as described in claim 4, characterized in that, The vulcanized sealing ring (6) is vulcanized rubber.

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