Durable shear valve with cleaning function

Abstract

The utility model provides a durable shear valve with a cleaning function, and relates to the field of shear valves. The durable shear valve with the cleaning function comprises a valve body, a bottom cover is arranged at the lower end of the valve body, a gate plate is arranged in the valve body, an annular groove is formed in the inner wall of the valve body, a valve seat is arranged in the annular groove, the gate plate penetrates through the valve seat, a valve deck is arranged at the upper end of the valve body, and the valve deck and the valve body are fixedly connected through a plurality of bolts. A protective cover is fixedly connected to the upper end of the valve body, the upper end of the valve seat is located in the protective cover, two purging ball valves are arranged at the upper end of the valve deck, a valve rod is arranged in the protective cover, the upper end of the valve rod penetrates through the valve deck, the lower end of the valve rod makes contact with the upper end of the gate plate, and an executing mechanism is installed at the upper end of the valve deck. And a discharge valve is mounted on the left side of the valve body. The durable shear valve with the cleaning function has the advantages that the durable shear valve can stably operate under severe working conditions and has high temperature resistance and wear resistance, and meanwhile, the interior of the valve can be conveniently cleaned.

Description

Technical Field

[0001] This utility model relates to the field of shear valve technology, and in particular to a durable shear valve with a cleaning function. Background Technology

[0002] In modern industrial production, especially in harsh environments such as petroleum, chemical, and power industries, where high temperature, high pressure, and strong corrosion are common, valves are key components for controlling the flow of fluid media, and their reliability and stability are of paramount importance.

[0003] Currently, valves on the market often encounter various problems when facing harsh operating conditions. For example, due to the characteristics of the medium and the complexity of the operating conditions, valves are prone to jamming, leading to valve malfunction and severely affecting normal production. Simultaneously, the sealing performance of ordinary valves is difficult to maintain under the long-term effects of high temperature, high pressure, and highly corrosive media. The sealing surface is easily corroded and worn, resulting in leakage. This not only wastes resources but may also cause safety accidents, threatening the safety of personnel and equipment.

[0004] Furthermore, during valve use, impurities easily accumulate inside the valve body cavity. These impurities can affect the normal operation of the valve, reduce its service life, and may even lead to valve malfunction. Existing valves often lack effective cleaning devices, making it impossible to remove impurities from the cavity in a timely manner, thus failing to meet the modern industrial requirements for high performance, long service life, and high reliability.

[0005] Therefore, a durable shear valve with a cleaning function is needed to solve the above problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a durable shear valve with a cleaning function.

[0007] This utility model provides a durable shear valve with cleaning function, comprising: a valve body, a bottom cover at the lower end of the valve body, a gate plate inside the valve body, an annular groove on the inner wall of the valve body, a valve seat in each of the annular grooves, the gate plate penetrating the valve seat, a valve cover at the upper end of the valve body, the valve cover being fixedly connected to the valve body by multiple bolts, a protective cover fixedly connected to the upper end of the valve body, the upper end of the valve seat being located inside the protective cover, two purge ball valves at the upper end of the valve cover, a valve stem inside the protective cover, the upper end of the valve stem penetrating the valve cover, the lower end of the valve stem contacting the upper end of the gate plate, an actuator installed at the upper end of the valve cover, and a discharge valve installed on the left side of the valve body.

[0008] Preferably, a second tubular spring is provided between the protective cover and the valve seat, two second sealing graphite rings are provided between the gate and the valve seat, a plurality of movable blocks are provided in the annular groove, the plurality of movable blocks are fixedly connected to the valve seat, a first tubular spring is provided between every two cooperating movable blocks, and a first sealing graphite ring is provided in the annular groove.

[0009] Preferably, the actuator includes a mounting bracket installed on the upper end of the valve cover, an electric cylinder is mounted on the upper end of the mounting bracket, and the upper end of the valve stem extends into the mounting bracket and is fixedly connected to the telescopic end of the electric cylinder.

[0010] Preferably, the upper end of the valve cover is provided with a cylindrical groove, the lower end of the mounting bracket is provided with a through-hole, the valve stem passes through the cylindrical groove and the through-hole, a bracket is provided in the cylindrical groove, a packing body is filled in the cylindrical groove, and a packing gland is provided in the through-hole.

[0011] Preferably, the valve body and valve cover are made of a high-temperature resistant alloy material, which is selected from Cr5Mo, CF3 or CR8.

[0012] Preferably, both the first sealing graphite ring and the second sealing graphite ring are high-purity expanded graphite rings.

[0013] Preferably, the packing body is made of a metal wire skeleton, the metal wire skeleton is a stainless steel wire braided structure, the sealing surface of the valve seat is overlaid with a nickel-based alloy, and the sealing surface of the gate is overlaid with a hard alloy.

[0014] Compared with related technologies, the durable shear valve with cleaning function provided by this utility model has the following beneficial effects:

[0015] 1. This utility model provides a durable shear valve with cleaning function. The valve body and valve cover of this device are made of high temperature resistant alloy material. The valve seat sealing surface is overlaid with nickel-based alloy, and the gate sealing surface is overlaid with hard alloy STL3. The hardness difference of the sealing pair is HRC7 and the hardness of all of them exceeds 55HRC. The heat resistance can reach 800℃, which can effectively resist the erosion of high temperature, high pressure and strong corrosive media, and significantly improve the valve's high temperature resistance, wear resistance and sealing performance.

[0016] 2. This utility model provides a durable shear valve with a cleaning function. The device adopts a double-layer tubular spring structure design to ensure the initial pre-tightening pressure, so that the valve seat and the gate are always tightly fitted throughout the process, which further enhances the sealing effect. In addition, the dust cover design effectively prevents the working medium from entering the upper cavity and bottom of the valve body, ensuring the stable opening and closing of the valve. At the same time, the spring on the protective cover can also press the valve seat against the gate to ensure sealing.

[0017] 3. This utility model provides a durable shear valve with a cleaning function. The device is designed with a high-pressure purging device and a venting device on the upper part of the valve cover and the bottom of the valve body, respectively. By activating these devices before the valve is opened or closed, impurities in the cavity can be thoroughly removed by purging the valve body cavity and packing area, as well as draining the bottom cover valve, thus ensuring the cavity is clean. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a durable shear valve with cleaning function proposed in this utility model;

[0019] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Bottom cover; 2. Valve body; 3. Gate; 4. Moving block; 5. First sealing graphite ring; 6. First tube spring; 7. Valve seat; 8. Second sealing graphite ring; 9. Valve cover; 10. Valve stem; 11. Protective cover; 12. Purge ball valve; 13. Bracket; 14. Packing gland; 15. Packing body; 16. Actuator; 17. Second tube spring; 18. Discharge valve. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please refer to the following: Figures 1 to 2A durable shear valve with cleaning function includes: a valve body 2, a bottom cover 1 at the lower end of the valve body 2, a gate 3 inside the valve body 2, an annular groove on the inner wall of the valve body 2, a valve seat 7 in each annular groove, the gate 3 penetrating the valve seat 7, a valve cover 9 at the upper end of the valve body 2, the valve cover 9 being fixedly connected to the valve body 2 by multiple bolts, a protective cover 11 fixedly connected to the upper end of the valve body 2, the upper end of the valve seat 7 being located inside the protective cover 11, two purge ball valves 12 at the upper end of the valve cover 9, a valve stem 10 inside the protective cover 11, the upper end of the valve stem 10 penetrating the valve cover 9, the lower end of the valve stem 10 contacting the upper end of the gate 3, an actuator 16 mounted on the upper end of the valve cover 9, and a discharge valve 18 mounted on the left side of the valve body 2. The actuator 16 includes a mounting bracket installed on the upper end of the valve cover 9. An electric cylinder is mounted on the upper end of the mounting bracket. The upper end of the valve stem 10 extends into the mounting bracket and is fixedly connected to the telescopic end of the electric cylinder. The upper end of the valve cover 9 is provided with a cylindrical groove. The lower end of the mounting bracket is provided with a through-hole. The valve stem 10 passes through the cylindrical groove and the through-hole. A bracket 13 is provided in the cylindrical groove. A packing body 15 is filled in the cylindrical groove. A packing gland 14 is provided in the through-hole. The valve body 2 and the valve cover 9 are made of high-temperature resistant alloy material, which is selected from Cr5Mo, CF3 or CR8. The packing body 15 is made of a metal wire skeleton, which is a stainless steel wire braided structure. The sealing surface of the valve seat 7 is overlaid with a nickel-based alloy, and the sealing surface of the gate 3 is overlaid with a hard alloy.

[0023] It should be noted that: the sealing surface of valve seat 7 is overlaid with nickel-based alloy, and the weld layer hardness is >HRC65; the sealing surface of gate 3 is overlaid with hard alloy STL3, and the thickness of the weld layer after machining is >2mm, with a hardness >HRC58; the hardness difference between the sealing pairs of valve seat 7 and gate 3 is HRC7. The valve's sealing pairs use STL and nickel-based alloys respectively, with excellent sealing surface hardness, both exceeding 55HRC, and heat resistance up to 800℃. The high-hardness alloy sealing surface is resistant to high temperature and pressure, corrosion, and toughness, ensuring the sealing surface remains intact, maintaining long-term sealing performance, significantly extending the valve's service life, and exhibiting excellent performance. An external high-pressure air pump is provided; during cleaning, the outlet of the high-pressure air pump is connected to the purge ball valve 12.

[0024] The protective cover 11 is provided with a second tube spring 17 between it and the valve seat 7. Two second sealing graphite rings 8 are provided between the gate 3 and the valve seat 7. Multiple movable blocks 4 are provided in the annular groove. The multiple movable blocks 4 are fixedly connected to the valve seat 7. A first tube spring 6 is provided between every two cooperating movable blocks 4. A first sealing graphite ring 5 is provided in the annular groove. Both the first sealing graphite ring 5 and the second sealing graphite ring 8 are high-purity expanded graphite rings.

[0025] It should be noted that the second tubular spring 17 installed between the protective cover 11 and the valve seat 7 provides additional preload, ensuring that the valve seat 7 and the gate 3 always maintain a tight fit, further enhancing the sealing effect. The two second sealing graphite rings 8 between the gate 3 and the valve seat 7, as well as the first sealing graphite ring 5 in the annular groove, are all made of high-purity expanded graphite. This material has excellent sealing properties and corrosion resistance, maintaining stable sealing performance under harsh conditions such as high temperature and strong corrosion. Multiple movable blocks 4 are fixedly connected to the valve seat 7, and a first tubular spring 6 is provided between every two cooperating movable blocks 4. This structural design allows the valve seat 7 to automatically adjust its position when subjected to external forces such as medium pressure through the coordinated action of the movable blocks 4 and the first tubular spring 6, ensuring that the sealing surfaces of the valve seat 7 and the gate 3 always maintain good contact, effectively avoiding sealing failure caused by external forces.

[0026] The working principle of the durable shear valve with cleaning function provided by this utility model is as follows: When the actuator 16 is activated, the telescopic end of the electric cylinder drives the valve stem 10 to move upward. The valve stem 10 then pushes the gate 3 upward, causing the gate 3 to gradually separate from the valve seat 7, allowing the medium to pass through the valve body 2. Before opening the valve, the purge ball valve 12 on the upper part of the valve cover 9 and the discharge valve 18 at the bottom of the valve body 2 are opened. The purge ball valve 12 is connected to the outlet of the high-pressure air pump. High-pressure gas purges the cavity and packing area of ​​the valve body 2, while the discharge valve 18 discharges wastewater, thoroughly removing impurities from the cavity and ensuring its cleanliness. During valve closing, the electric cylinder drives the valve stem 10 downward, and the gate 3 moves downward until the gate 3 and valve seat 7 are tightly fitted together, achieving a seal.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A durable shear valve with a cleaning function, characterized in that, include: A valve body (2) is provided with a bottom cover (1) at its lower end. A gate (3) is provided inside the valve body (2). An annular groove is provided on the inner wall of the valve body (2). A valve seat (7) is provided in each of the annular grooves. The gate (3) passes through the valve seat (7). A valve cover (9) is provided at the upper end of the valve body (2). The valve cover (9) is fixedly connected to the valve body (2) by multiple bolts. A protective cover (11) is fixedly connected to the upper end of the valve body (2). The upper end of the valve seat (7) is located inside the protective cover (11). The upper end of the valve cover (9) is provided with two purge ball valves (12). The protective cover (11) is provided with a valve stem (10). The upper end of the valve stem (10) passes through the valve cover (9). The lower end of the valve stem (10) contacts the upper end of the gate (3). An actuator (16) is installed on the upper end of the valve cover (9). A discharge valve (18) is installed on the left side of the valve body (2).

2. A durable shear valve with cleaning function according to claim 1, characterized in that, A second tube spring (17) is provided between the protective cover (11) and the valve seat (7), two second sealing graphite rings (8) are provided between the gate (3) and the valve seat (7), a plurality of movable blocks (4) are provided in the annular groove, the plurality of movable blocks (4) are fixedly connected to the valve seat (7), a first tube spring (6) is provided between every two cooperating movable blocks (4), and a first sealing graphite ring (5) is provided in the annular groove.

3. A durable shear valve with cleaning function according to claim 1, characterized in that: The actuator (16) includes a mounting bracket installed on the upper end of the valve cover (9), an electric cylinder is mounted on the upper end of the mounting bracket, and the upper end of the valve stem (10) extends into the mounting bracket and is fixedly connected to the telescopic end of the electric cylinder.

4. A durable shear valve with cleaning function according to claim 3, characterized in that: The upper end of the valve cover (9) is provided with a cylindrical groove, the lower end of the mounting bracket is provided with a through-hole, the valve stem (10) passes through the cylindrical groove and the through-hole, the cylindrical groove is provided with a bracket (13), the cylindrical groove is filled with a packing body (15), and the through-hole is provided with a packing gland (14).

5. A durable shear valve with cleaning function according to claim 1, characterized in that: The valve body (2) and valve cover (9) are made of high-temperature resistant alloy material, which is selected from Cr5Mo, CF3 or CR8.

6. A durable shear valve with a cleaning function according to claim 2, characterized in that: Both the first sealing graphite ring (5) and the second sealing graphite ring (8) are high-purity expanded graphite rings.

7. A durable shear valve with a cleaning function according to claim 4, characterized in that: The packing body (15) is made of a metal wire skeleton, which is a stainless steel wire braided structure. The sealing surface of the valve seat (7) is overlaid with a nickel-based alloy, and the sealing surface of the gate (3) is overlaid with a hard alloy.

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