A valve body with pressure relief function

Abstract

The utility model provides a valve body with pressure relief function, including valve body, the valve body is installed and is provided with the active pressure relief ware, valve seat and valve cover subassembly, valve rod nut of valve cover subassembly is connected with hand wheel fixedly, valve rod nut of valve cover subassembly links with valve rod, the lower extreme of valve rod is fixedly connected with the valve flap inside valve body, the pressure relief recess that pressure relief valve is set is provided with pressure relief disc in the valve flap lower surface setting, is all provided with pressure relief hole in the valve flap and pressure relief disc and penetrates the opening, pressure relief disc is fixed with the lower extreme of pressure relief rod middle thread installation in valve rod, and the upper end fixed mounting of pressure relief rod has pressure relief screw head, the utility model discloses through pressure relief rod drive pressure relief disc step by step operation, reduces the valve flap opening force, adapts high pressure large caliber scene, double sealing structure wear resistance, and the sealing property is reliable, can adjust pressure relief speed, and the adaptability is strong, and the active pressure relief ware realizes overpressure automatic pressure relief, and the security is promoted.

Description

Technical Field

[0001] This utility model belongs to the field of valve body technology, and in particular relates to a valve body with pressure relief function. Background Technology

[0002] In fluid transport systems, gate valves are commonly used opening and closing control components. Their working principle involves the contact or separation of the valve disc and valve seat to achieve fluid flow control. In the closed state, traditional gate valves experience high system pressure upstream of the valve disc (inlet) and low or normal pressure downstream (outlet), creating a significant pressure difference. When opening, the pressure thrust of the medium on the valve disc (determined by the pressure difference and the valve disc's pressure-bearing area) must be overcome, resulting in a large rotational force required for the valve stem. Especially in high-pressure, large-diameter scenarios, this not only makes operation laborious but also easily leads to wear on components such as the valve stem and handwheel due to excessive driving force, shortening the valve's service life.

[0003] To address the aforementioned issues, some shut-off valves have been equipped with pressure relief structures, but the existing designs have significant flaws: Pressure relief and sealing are difficult to achieve simultaneously: Most pressure relief structures rely on a single pressure relief hole or miniature valve, which is only sealed by a sealing plug when closed. This can easily lead to seal failure and leakage due to media erosion and particulate wear. The pressure relief process is uncontrollable: the pressure relief rate is fixed and cannot be adjusted according to the system pressure (such as slow pressure relief for high pressure and rapid balancing for emergency start-up), resulting in poor adaptability. Lack of proactive safety pressure relief mechanism: When the system is over-pressurized (such as when the medium is abnormally pressurized), it cannot automatically trigger pressure relief, which poses a risk of pipeline or equipment overload.

[0004] Therefore, it is essential to invent a valve body with a pressure relief function. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a valve body with pressure relief function, including a valve body, an active pressure relief device, a valve seat, a valve cover assembly, a handwheel, a valve stem, a valve disc, a pressure relief recess, a pressure relief plate, a pressure relief hole, a pressure relief rod, and a pressure relief screw. The active pressure relief device, valve seat, and valve cover assembly are installed on the valve body. The valve stem nut of the valve cover assembly is fixedly connected to the handwheel, and the valve stem nut of the valve cover assembly is connected to the valve stem. The lower end of the valve stem is fixedly connected to the valve disc inside the valve body. A pressure relief plate is provided in the pressure relief recess on the lower surface of the valve disc. A pressure relief hole is provided through the valve disc and the pressure relief plate. The pressure relief plate is fixed to the lower end of the pressure relief rod that is threaded in the middle of the valve stem, and a pressure relief screw is fixedly installed on the upper end of the pressure relief rod.

[0006] Preferably, the active pressure relief device is located below the valve seat and valve disc. The active pressure relief device includes a pressure relief seat, a pressure relief cover, a spring, a pressure relief head, a pressure relief groove, and a pressure relief tank. The pressure relief seat is fixedly installed on the valve body and located below the valve seat and valve disc. A pressure relief cover is fixedly installed on the lower surface of the pressure relief seat. The spring inside the pressure relief cover is connected to the pressure relief head, and the pressure relief head can block the pressure relief groove of the pressure relief seat. The pressure relief cover is connected to the pressure relief tank through a pipe.

[0007] Preferably, the valve body is connected to the pressure relief cover via a pressure relief groove formed by a pressure relief seat, and both the pressure relief groove and the pressure relief head are conical structures.

[0008] Preferably, the valve seat inside the valve body can be blocked by the valve disc, and the pressure relief disc is allowed to move up and down and rotate at a constant angle within the pressure relief recess on the lower surface of the valve disc.

[0009] Preferably, the pressure relief holes that are opened through the valve disc and the pressure relief plate can be intermittently connected. That is, the valve disc and the pressure relief plate are tightly fitted together and their pressure relief holes are not connected. Conversely, they are not in contact with each other and have a gap, and their pressure relief holes are connected.

[0010] Preferably, the pressure relief disc can be driven by the pressure relief rod installed in the middle of the valve stem, and the pressure relief screw head fixedly installed at the upper end of the pressure relief rod has a hexagonal structure.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a pressure relief rod to drive a pressure relief disc to move within the pressure relief recess of the valve disc, achieving a step-by-step operation of "pressure relief hole connection - pressure balance - valve disc opening": Before opening, the pressure relief disc separates from the valve disc and rotates, connecting their pressure relief holes. The upstream high-pressure medium flows downstream through the pressure relief hole, reducing the pressure difference on both sides of the valve disc. When the valve rod drives the valve disc to rise, the thrust of the medium on the valve disc is greatly reduced, effectively reducing the rotational force required for opening. This invention is particularly suitable for high-pressure, large-diameter scenarios, reducing operational intensity and component wear.

[0012] In the closed state, the pressure relief plate and valve disc are tightly fitted together, and the pressure relief holes are completely offset, forming a dual sealing structure of "mechanical seal on the contact surface + physical isolation of the pressure relief holes". Compared with a single sealing plug design, this structure can withstand media erosion and particulate wear, and its long-term sealing performance is more reliable, ensuring no media leakage when the valve is closed.

[0013] This utility model's pressure relief rod drives the pressure relief disc through threaded transmission. By adjusting the rotation angle and lifting distance of the pressure relief screw head (hexagonal structure, easy for tool operation), the connection area of ​​the pressure relief hole can be controlled (partial connection for small flow pressure relief, complete connection for large flow pressure relief), thereby flexibly adjusting the pressure relief speed to meet different needs such as slow pressure relief and rapid balance in emergency opening of high-pressure systems, making it more adaptable.

[0014] The active pressure relief device (including pressure relief seat, spring, and pressure relief head) installed at the bottom of the valve body of this utility model can realize automatic pressure relief in case of overpressure: when the system pressure exceeds the preset value of the spring, the high-pressure medium pushes the pressure relief head to compress the spring, open the pressure relief groove, and the medium flows into the pressure relief tank through the pressure relief cover, avoiding damage to pipelines or equipment due to overpressure; after the pressure returns to normal, the spring drives the pressure relief head to reset and seal the pressure relief groove, without the need for manual intervention, thus improving the safety of system operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a half-sectional structural schematic diagram of the present invention.

[0017] Figure 3 This is a utility model Figure 2 Another perspective structural diagram.

[0018] Figure 4 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0019] Figure 5 This is a utility model Figure 3 A magnified schematic diagram of the structure at point B.

[0020] In the picture: 1. Valve body, 2. Active pressure relief device, 21. Pressure relief seat, 22. Pressure relief cover, 23. Spring, 24. Pressure relief head, 25. Pressure relief groove, 26. Pressure relief tank, 3. Valve seat, 4. Valve cover assembly, 5. Handwheel, 6. Valve stem, 7. Valve disc, 8. Pressure relief recess, 9. Pressure relief plate, 10. Pressure relief hole, 11. Pressure relief rod, 12. Pressure relief screw. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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 the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0023] As attached Figure 1 To be continued Figure 5 As shown: This utility model provides a valve body with pressure relief function, including a valve body 1, an active pressure relief device 2, a valve seat 3, a valve cover assembly 4, a handwheel 5, a valve stem 6, a valve disc 7, a pressure relief recess 8, a pressure relief plate 9, a pressure relief hole 10, a pressure relief rod 11, and a pressure relief screw head 12. The active pressure relief device 2, the valve seat 3, and the valve cover assembly 4 are installed on the valve body 1. The valve stem nut of the valve cover assembly 4 is fixedly connected to the handwheel 5. The valve stem nut of the valve cover assembly 4 is connected to the valve stem 6. The lower end of the valve stem 6 is fixedly connected to the valve disc 7 inside the valve body 1. The pressure relief recess 8 on the lower surface of the valve disc 7 is provided with a pressure relief plate 9. Both the valve disc 7 and the pressure relief plate 9 are provided with pressure relief holes 10. The pressure relief plate 9 is fixed to the lower end of the pressure relief rod 11, which is threaded in the middle of the valve stem 6. The upper end of the pressure relief rod 11 is fixedly installed with a pressure relief screw head 12.

[0024] Furthermore, the active pressure relief device 2 is located directly below the valve seat 3 and valve disc 7, corresponding directly to the internal flow channel of the valve body 1, and can quickly respond to changes in the medium pressure upstream of valve disc 7. The pressure relief seat 21 is fixedly installed on the lower inner wall of the valve body 1 by flange or welding, and is located directly below the sealing surface of the valve seat 3, ensuring that when valve disc 7 is closed, the upstream high-pressure medium can directly act on the pressure relief seat 21; the lower surface of the pressure relief seat 21 is fixedly connected to the pressure relief cover 22 by bolts, and an oil-resistant sealing gasket (such as a nitrile rubber gasket) is installed at the contact point between the two to prevent the medium from leaking from the connection; one end of the spring 23 inside the pressure relief cover 22 is welded or clipped to the bottom inner wall of the pressure relief cover 22, and the other end is rigidly connected to the lower end face of the pressure relief head 24 (such as by thread). With the addition of a locking nut, the spring 23's elastic coefficient is designed according to the system's preset safety pressure, ensuring that the pressure relief head 24 can compress the spring when the medium pressure exceeds the threshold. The upper end face of the pressure relief head 24 can form a sealing fit with the pressure relief groove 25 of the pressure relief seat 21, sealing the pressure relief groove 25 under normal conditions under the action of the spring force. The bottom side of the pressure relief cover 22 has an interface that connects to the pressure relief tank 26 through a pressure-resistant pipe (such as a seamless steel pipe). The two ends of the pipe are connected by flanges and fitted with metal spiral wound gaskets to ensure that the overpressure medium can be safely introduced into the pressure relief tank 26 for temporary storage. In addition, both the pressure relief seat 21 and the pressure relief cover 22 are made of cast steel or stainless steel, and the spring 23 is made of high-strength spring steel (such as 60Si2Mn) to ensure structural stability under high-pressure environments.

[0025] Furthermore, the high-pressure flow channel inside the valve body 1 forms a communication channel with the pressure relief cover 22 through the pressure relief groove 25 opened through the pressure relief seat 21. That is, the upstream medium can enter the pressure relief cover 22 through the pressure relief groove 25 when overpressure occurs, and then flow into the pressure relief tank 26 through the pipeline. Both the pressure relief groove 25 and the pressure relief head 24 adopt a conical structure (the taper is usually 1:10 to 1:20). The accuracy of the conical surface of both must reach IT7 level or above. The advantage of this design is that the conical fit can achieve a "line seal" effect. Compared with the planar seal, its contact pressure is more concentrated and the sealing reliability is higher. At the same time, the conical structure has self-centering. When the pressure relief head 24 is reset under the action of spring force, it can automatically fit with the conical surface of the pressure relief groove 25, avoiding sealing failure caused by installation deviation.

[0026] Furthermore, the valve seat 3 inside the valve body 1 has an annular structure, with a sealing surface (such as a spherical or conical surface) machined on its upper end face. This sealing surface (matching structure) mates with the sealing surface (matching structure) on the lower end face of the valve disc 7. When the valve disc 7 descends, the valve seat 3 can be completely sealed by mechanical clamping force (or assisted by medium pressure), cutting off the upstream and downstream flow channels. The valve seat 3 is usually fixed to the valve body 1 by threaded connection or interference fit. The sealing surface material is selected according to the characteristics of the medium (e.g., PTFE for soft seals, stainless steel or hard alloy for hard seals).

[0027] Furthermore, the pressure relief recess 8 on the lower surface of the valve disc 7 is a circular groove with an inner diameter slightly larger than the outer diameter of the pressure relief plate 9, providing guide space for the pressure relief plate 9 to rise, fall, and rotate. The pressure relief plate 9 is connected to the lower end of the pressure relief rod 11 by a key or weld to ensure that the two move synchronously. Driven by the pressure relief rod 11, the pressure relief plate 9 can move up and down along the axial direction of the pressure relief recess 8 (the stroke is usually 2-5mm, which meets the spacing required for the connection of the pressure relief holes 10), and can rotate around the axial direction at a constant angle (such as 90° or 180°) – this angle is determined by the distribution design of the pressure relief holes 10 (for example, when the two holes are symmetrically distributed, a rotation of 180° will allow for complete connection). In addition, an annular guide groove can be machined on the bottom surface of the pressure relief recess 8, and a boss is provided at the corresponding position of the pressure relief plate 9 to further constrain the rotation angle and prevent swaying.

[0028] Furthermore, the pressure relief holes 10 on the valve disc 7 and the pressure relief plate 9 are through-hole round holes, with the number (usually 2-4) and distribution position (such as uniformly symmetrical along the circumference) being completely consistent, and the hole diameter is designed according to the pressure relief flow requirements (such as 5-10mm for high pressure systems). When the pressure relief disc 9 moves downward under the action of the pressure relief rod 11 and forms a gap (usually 1-3mm) with the bottom surface of the pressure relief recess 8 of the valve disc 7, rotating the pressure relief disc 9 to a preset angle can make the pressure relief holes 10 of the two completely aligned, forming a pressure relief channel from upstream (below the valve disc 7) to downstream (above the valve disc 7, connected through the side flow channel of the valve disc 7 or the inner cavity of the valve body 1); when the pressure relief disc 9 moves upward and fits tightly with the bottom surface of the pressure relief recess 8 of the valve disc 7 (without gap), the pressure relief holes 10 of the two are completely misaligned due to rotational misalignment. At this time, the pressure relief holes 10 are blocked by the solid part of the other, and the mating surface achieves auxiliary sealing through mechanical clamping force (provided by the thread preload of the pressure relief rod 11) to prevent the medium from leaking from the pressure relief holes 10.

[0029] Furthermore, the pressure relief disc 9 is driven by the pressure relief rod 11, which passes through the central through hole of the valve stem 6 and is threaded to the valve stem 6 (e.g., internal threads are machined on the inner wall of the valve stem 6, and external threads are machined on the outer wall of the pressure relief rod 11), forming a helical transmission pair. When the pressure relief rod 11 is rotated, its axial displacement can be converted into the lifting and lowering motion of the pressure relief disc 9. The upper end of the pressure relief rod 11 is welded or integrally formed with a pressure relief screw head 12. Its hexagonal structure (the distance between opposite sides is designed according to the specifications of the operating tool, such as 14mm or 17mm) is compatible with a standard wrench, making it easy to apply torque to control the rotation angle. In addition, the side of the pressure relief screw head 12 can be set with scale lines, which cooperate with the baseline at the upper end of the valve stem 6 to visually display the on / off state of the pressure relief hole 10 (e.g., "0°" corresponds to closed, and "90°" corresponds to open). To prevent the pressure relief rod 11 from rotating on its own in a vibration environment, a locking nut can be set between the pressure relief screw head 12 and the valve stem 6. After adjustment, tighten the nut to lock the position.

[0030] The working principle is as follows: First, when the valve body 1 is in the closed state, the valve disc 7 is tightly fitted with the valve seat 3 under the action of the valve stem 6, cutting off the upstream and downstream flow channels; at this time, the pressure relief disc 9 is tightly fitted with the pressure relief recess 8 of the valve disc 7 under the action of the pressure relief rod 11, and the pressure relief holes 10 of the two are completely misaligned, forming a seal to prevent medium leakage; the pressure relief head 24 of the active pressure relief device 2 seals the pressure relief groove 25 of the pressure relief seat 21 under the action of the spring 23, maintaining the normal pressure of the system.

[0031] Secondly, when it is necessary to open valve body 1, first use a tool to rotate the pressure relief screw head 12, which will drive the pressure relief rod 11 to rotate. Since the pressure relief rod 11 is threadedly engaged with the valve stem 6, when rotating, the pressure relief rod 11 will drive the pressure relief plate 9 to move downward along the pressure relief recess 8 of the valve disc 7, so that a gap is formed between the pressure relief plate 9 and the valve disc 7. Continue to rotate the pressure relief plate 9 to a preset angle (such as 90° or 180°) so that the pressure relief holes 10 of the two are completely aligned. The upstream high pressure medium flows downstream through the pressure relief hole 10, gradually balancing the pressure difference on both sides of the valve disc 7.

[0032] Next, after the pressure is balanced (or after the pressure decreases), turn the handwheel 5 to rotate the valve stem nut of the valve cover assembly 4. Since the valve stem nut is fixed, the valve stem 6 moves upward under the threaded drive, thereby causing the valve disc 7 to disengage from the valve seat 3. At this time, since the pressure on both sides of the valve disc 7 is close to balanced, the rotational force required to open is significantly reduced, the valve body 1 is fully opened, and the medium flows normally.

[0033] Then, when it is necessary to close the valve body 1, turn the handwheel 5 in the opposite direction. The valve stem 6 drives the valve disc 7 to move downward until the valve disc 7 is tightly fitted with the valve seat 3, cutting off the upstream and downstream flow channels. Then, turn the pressure relief screw head 12 in the opposite direction. The pressure relief rod 11 drives the pressure relief plate 9 to move upward, so that it is tightly fitted with the pressure relief recess 8 of the valve disc 7. At the same time, rotate the reset to completely offset the pressure relief hole 10 and restore the sealing state.

[0034] Finally, if the system experiences overpressure (the medium pressure exceeds the preset safety value), the active pressure relief device 2 will automatically activate: the high-pressure medium pushes the pressure relief head 24 to compress the spring 23, causing the pressure relief head 24 to disengage from the pressure relief groove 25. The medium then enters the pressure relief cover 22 through the pressure relief groove 25 and flows into the pressure relief tank 26 through the pipeline for temporary storage, thus achieving safe pressure relief. When the pressure drops to the safe range, the spring 23 pushes the pressure relief head 24 to reset, resealing the pressure relief groove 25 to ensure stable system operation.

[0035] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A valve body with a pressure relief function, characterized in that, The valve includes a valve body (1), an active pressure relief device (2), a valve seat (3), a valve cover assembly (4), a handwheel (5), a valve stem (6), a valve disc (7), a pressure relief recess (8), a pressure relief plate (9), a pressure relief hole (10), a pressure relief rod (11), and a pressure relief screw (12). The active pressure relief device (2), the valve seat (3), and the valve cover assembly (4) are installed on the valve body (1). The valve stem nut of the valve cover assembly (4) is fixedly connected to the handwheel (5). The valve stem nut is connected to the valve stem (6). The lower end of the valve stem (6) is fixedly connected to the valve disc (7) inside the valve body (1). The pressure relief recess (8) provided on the lower surface of the valve disc (7) is provided with a pressure relief plate (9). Both the valve disc (7) and the pressure relief plate (9) are provided with pressure relief holes (10). The pressure relief plate (9) is fixed to the lower end of the pressure relief rod (11) installed in the middle of the valve stem (6). The upper end of the pressure relief rod (11) is fixedly installed with a pressure relief screw head (12).

2. A valve body with pressure relief function as described in claim 1, characterized in that: The active pressure relief device (2) is located below the valve seat (3) and valve disc (7). The active pressure relief device (2) includes a pressure relief seat (21), a pressure relief cover (22), a spring (23), a pressure relief head (24), a pressure relief groove (25), and a pressure relief tank (26). The pressure relief seat (21) is fixedly installed on the valve body (1) and located below the valve seat (3) and valve disc (7). The pressure relief cover (22) is fixedly installed on the lower surface of the pressure relief seat (21). The spring (23) inside the pressure relief cover (22) is connected to the pressure relief head (24). The pressure relief head (24) can block the pressure relief groove (25) of the pressure relief seat (21). The pressure relief cover (22) is connected to the pressure relief tank (26) through a pipe.

3. A valve body with pressure relief function as described in claim 2, characterized in that: The valve body (1) is connected to the pressure relief cover (22) through the pressure relief groove (25) opened by the pressure relief seat (21). Both the pressure relief groove (25) and the pressure relief head (24) are conical structures.

4. A valve body with pressure relief function as described in claim 3, characterized in that: The valve seat (3) inside the valve body (1) can be blocked by the valve disc (7), and the pressure relief plate (9) allows to move up and down in the pressure relief recess (8) on the lower surface of the valve disc (7).

5. A valve body with pressure relief function as described in claim 4, characterized in that: The pressure relief holes (10) that are opened through the valve disc (7) and the pressure relief plate (9) can be intermittently connected. That is, the valve disc (7) and the pressure relief plate (9) are tightly fitted together, and their pressure relief holes (10) are not connected. Conversely, the two do not contact each other and have a gap, and their pressure relief holes (10) are connected.

6. A valve body with pressure relief function as described in claim 5, characterized in that: The pressure relief plate (9) can be driven by the pressure relief rod (11) installed in the middle of the valve stem (6), and the pressure relief screw head (12) fixedly installed at the upper end of the pressure relief rod (11) has a hexagonal structure.

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