Fixed valve seat fireproof structure butterfly valve

Abstract

The utility model relates to valve technical field, and disclose a fixed valve seat fireproof structure butterfly valve, this fixed valve seat fireproof structure butterfly valve, including valve body, soft valve seat, compression ring, the part of cooperation of valve body with soft valve seat is formed fixed valve seat and is processed, fixed valve seat sealing surface is provided on the fixed valve seat, the inside of valve body is provided with the valve plate, the valve plate is provided with the valve plate sealing surface that cooperates with fixed valve seat sealing surface, soft valve seat is installed on the plane of fixed valve seat, the compression ring is set up in the outside of soft valve seat and is pressed to the soft valve seat, this utility model valve fixed valve seat is directly formed on the valve body and is processed, need not additional increase component, and the ordinary equipment processing is needed only in processing and forming, and the cost is low, and the finished product assembly process is difficult, improves the efficiency, reduced the man -hour cost, reduced the valve overall cost.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a fixed-seat fireproof butterfly valve. Background Technology

[0002] Butterfly valves, as commonly used control components in fluid transport systems, are widely used in industries such as petroleum, chemical, and metallurgy. Among them, fire-resistant butterfly valves are crucial for maintaining sealing performance under high-temperature conditions such as fires to ensure system safety, making them key equipment in high-safety scenarios. Existing soft-seal fire-resistant butterfly valves generally adopt a split design, meaning an additional split seat is added behind the soft-seal valve seat. This split seat is typically made of bent steel plate with a thickness of 1.5mm to 2mm. Since sealing relies on the mating of the split seat and the valve plate's sealing surface to achieve a seal after the soft-seal valve seat fails, the precision requirements for this mating are extremely high, leading to stringent processing and bending accuracy standards for the split seat.

[0003] The above design has significant drawbacks: on the one hand, the high-precision machining requirements significantly increase the process cost, which is not conducive to large-scale production and cost control; on the other hand, the split valve seat is a thin sheet part, which is prone to deformation during installation. This not only increases the installation difficulty, but also directly damages the fit between the valve seat and the valve plate sealing surface, causing the valve to fail to meet the sealing requirements under fireproof conditions, creating serious safety hazards and making it difficult to meet the dual requirements of stability and economy for fireproof butterfly valves in industrial production. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fixed-seat fireproof butterfly valve, which solves two problems: firstly, the high-precision machining requirements significantly increase process costs, hindering large-scale production and cost control; secondly, the split-type valve seat is a thin sheet component, which is prone to deformation during installation, increasing installation difficulty and directly damaging the fit between the valve seat and the valve plate sealing surface. This results in the valve failing to meet sealing requirements under fireproof conditions, creating serious safety hazards and failing to meet the dual requirements of stability and economy for fireproof butterfly valves in industrial production.

[0005] This utility model provides the following technical solution: a fixed valve seat fireproof structure butterfly valve, including a valve body, a flexible valve seat, and a pressure ring. The part of the valve body that mates with the flexible valve seat is machined to form a fixed valve seat. A fixed valve seat sealing surface is provided on the fixed valve seat. A valve plate is provided inside the valve body. A valve plate sealing surface that mates with the fixed valve seat sealing surface is provided on the valve plate.

[0006] The flexible valve seat is mounted on the plane of the fixed valve seat, and the pressure ring is sleeved on the outside of the flexible valve seat and presses the flexible valve seat tightly.

[0007] Preferred technical solution 1: The pressure ring is provided with a plurality of screws, which pass through the pressure ring and are connected to the valve body to fix the pressure ring and the soft valve seat on the valve body.

[0008] Preferred technical solution 2: A gap is reserved between the fixed valve seat sealing surface and the valve plate sealing surface.

[0009] Preferred technical solution three: The soft valve seat is made of a temperature-resistant and corrosion-resistant elastic material.

[0010] Preferred technical solution four: The plurality of screws are evenly distributed along the circumference of the pressure ring to ensure that the pressure ring exerts a uniform clamping force on the soft valve seat.

[0011] Preferred technical solution five: The fixed valve seat is machined on the valve body blank by a lathe, and the fixed valve seat is stepped.

[0012] Compared with existing technologies, this utility model provides a fixed-seat fireproof butterfly valve with the following advantages: Under normal operating conditions, the valve relies on the tight fit between the soft valve seat and the valve plate to achieve fluid sealing, ensuring no leakage during fluid transportation; when the valve is in a high-temperature environment such as combustion, the soft valve seat made of heat-resistant and corrosion-resistant elastic material fails under high temperature. At this time, the valve plate is displaced under fluid pressure or external driving force, and its sealing surface gradually approaches and eventually tightly adheres to the sealing surface of the fixed valve seat. Through the cooperation of the two, a seal is re-achieved, meeting the valve sealing performance requirements under fireproof conditions and ensuring the safe operation of the system under special conditions; the fixed valve seat of this utility model is directly machined on the valve body without the need for additional components. The machining only requires ordinary equipment, resulting in low cost and easy assembly of the finished product, improving efficiency, reducing labor costs, and lowering the overall cost of the valve. Attached Figure Description

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

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 For the present utility model Figure 2 Enlarged view of the structure of A in the middle.

[0016] In the diagram: 1. Valve body; 2. Flexible valve seat; 3. Fixed valve seat; 4. Fixed valve seat sealing surface; 5. Screw; 6. Valve plate; 7. Valve plate sealing surface; 8. Pressure ring. Detailed Implementation

[0017] Please see Figure 1-3 ,

[0018] Example 1: A fixed-seat fireproof butterfly valve includes a valve body 1, a flexible valve seat 2, and a pressure ring 8. The part of the valve body 1 that mates with the flexible valve seat 2 is machined to form a fixed valve seat 3. A fixed valve seat sealing surface 4 is provided on the fixed valve seat 3. A valve plate 6 is provided inside the valve body 1. A valve plate sealing surface 7 that mates with the fixed valve seat sealing surface 4 is provided on the valve plate 6.

[0019] The flexible valve seat 2 is installed on the plane of the fixed valve seat 3, and the pressure ring 8 is sleeved on the outside of the flexible valve seat 2 and presses the flexible valve seat 2.

[0020] Example 2: The difference between this example and Example 1 is that the pressure ring 8 is provided with multiple screws 5, which pass through the pressure ring 8 and are connected to the valve body 1 to fix the pressure ring 8 and the soft valve seat 2 to the valve body 1.

[0021] Example 3: The difference between this example and Example 1 is that a gap is reserved between the fixed valve seat sealing surface 4 and the valve plate sealing surface 7.

[0022] Example 4: The difference between this example and Example 1 is that the soft valve seat 2 is made of a temperature-resistant and corrosion-resistant elastic material.

[0023] Example 5: The difference between this example and Example 1 is that multiple screws 5 are evenly distributed along the circumference of the pressure ring 8 to ensure that the pressure ring 8 exerts a uniform clamping force on the soft valve seat 2.

[0024] Example 6: The difference between this example and Example 1 is that the fixed valve seat 3 is machined on the valve body 1 blank by a lathe, and the fixed valve seat 3 is stepped.

[0025] In summary, this fixed-seat fireproof butterfly valve achieves fluid sealing under normal operating conditions by relying on the tight fit between the soft valve seat 2 and the valve plate 6, ensuring no leakage during fluid transport. When the valve is in a high-temperature environment such as combustion, the soft valve seat 2, made of heat-resistant and corrosion-resistant elastic material, fails under high temperature. At this time, the valve plate 6 is displaced under fluid pressure or external driving force, and its valve plate sealing surface 7 gradually approaches and eventually tightly adheres to the fixed valve seat sealing surface 4 of the fixed valve seat 3. Through the cooperation of the two, a seal is re-achieved, meeting the valve sealing performance requirements under fireproof conditions and ensuring the safe operation of the system under special conditions. The fixed valve seat of this utility model is directly machined on the valve body without the need for additional components. The machining only requires ordinary equipment, resulting in low cost and easy assembly of the finished product, improving efficiency, reducing labor costs, and lowering the overall cost of the valve.

Claims

1. A fixed-seat fireproof butterfly valve, comprising a valve body (1), a flexible valve seat (2), and a pressure ring (8), characterized in that: The valve body (1) and the soft valve seat (2) are machined to form a fixed valve seat (3). The fixed valve seat (3) is provided with a fixed valve seat sealing surface (4). The valve body (1) is provided with a valve plate (6). The valve plate (6) is provided with a valve plate sealing surface (7) that cooperates with the fixed valve seat sealing surface (4). The soft valve seat (2) is installed on the plane of the fixed valve seat (3), and the pressure ring (8) is sleeved on the outside of the soft valve seat (2) and presses the soft valve seat (2).

2. The fixed-seat fireproof butterfly valve according to claim 1, characterized in that: The pressure ring (8) is provided with a plurality of screws (5), which pass through the pressure ring (8) and are connected to the valve body (1) to fix the pressure ring (8) and the soft valve seat (2) on the valve body (1).

3. The fixed-seat fireproof butterfly valve according to claim 1, characterized in that: A gap is reserved between the fixed valve seat sealing surface (4) and the valve plate sealing surface (7).

4. The fixed-seat fireproof butterfly valve according to claim 1, characterized in that: The soft valve seat (2) is made of a temperature-resistant and corrosion-resistant elastic material.

5. A fixed-seat fireproof butterfly valve according to claim 2, characterized in that: Multiple screws (5) are evenly distributed along the circumference of the pressure ring (8) to ensure that the pressure ring (8) exerts a uniform clamping force on the soft valve seat (2).

6. A fixed-seat fireproof butterfly valve according to claim 1, characterized in that: The fixed valve seat (3) is machined on the valve body (1) blank by a lathe, and the fixed valve seat (3) is stepped.

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