Ventilation valves for floating roofs

Abstract

This utility model discloses a venting valve for a floating roof, comprising a venting valve body, a first sealing component, a valve cover assembly that mates with the first sealing component, and a valve stem. The venting valve body has a through hole. The first sealing component is annular and includes a mounting part and a sealing part. One end of the mounting part has a mating groove, into which the end of the valve body is inserted. After the other end of the mounting part is fixed to the sealing part, a hollow part is formed between the mounting part and the sealing part, allowing the sealing part to deform under the pressure of the valve cover assembly. The valve cover assembly surrounds the venting valve body, and the valve stem passes through the venting valve body, with one end of the valve stem fixed to the valve cover assembly. This utility model can automatically open the venting valve when the valve stem touches the bottom, allowing the space between the floating roof and the tank bottom to communicate with the atmosphere, preventing the floating roof from collapsing under negative pressure.

Description

Technical Field

[0001] This utility model relates to the field of floating roofs for oil storage tanks, and specifically to a venting valve for floating roofs. Background Technology

[0002] A floating roof for an oil storage tank is a floating device that covers the surface of the liquid in the tank. It floats as the liquid level rises and falls, primarily used to reduce evaporation losses of the medium inside the tank and prevent oil and gas leaks. Through buoyancy, the floating roof isolates the liquid inside the tank from the atmosphere, thereby reducing oil evaporation losses.

[0003] The floating roof works in conjunction with the storage tank. As oil is pumped out of the tank, the oil level drops, and the floating roof descends accordingly. To prevent the floating roof from hitting the bottom, outriggers are installed at its lower end. When the floating roof descends to the point where the lower end of the outriggers contacts the bottom of the tank, it cannot descend further. Supported by the outriggers, the floating roof maintains a distance of 1.8-2.0 meters from the tank bottom. At this point, there is still oil in the space between the floating roof and the tank bottom. If the oil pump continues to pump out the oil, the space between the floating roof and the tank bottom can easily become vacuumed as the oil level drops and the floating roof does not move. Since the floating roof consists of a housing and a honeycomb core installed inside the housing, the negative pressure of the suction can cause the floating roof to deform or even shrivel, resulting in changes in its dimensions and ultimately rendering it unusable. Utility Model Content

[0004] This invention provides a venting valve for a floating roof. When the valve stem touches the bottom, the venting valve can be automatically opened to allow the space between the floating roof and the bottom of the tank to be connected with the atmosphere, thus preventing the floating roof from drying out under negative pressure.

[0005] A venting valve for a floating roof includes a venting valve body, a first sealing component, a valve cover assembly that mates with the first sealing component, and a valve stem. The venting valve body has a through hole. The first sealing component is annular and includes a mounting part and a sealing part. One end of the mounting part has a mating groove, and the end of the valve body is inserted into the mating groove. After the other end of the mounting part is fixed to the sealing part, a hollow part is formed between the mounting part and the sealing part, which allows the sealing part to deform under the pressure of the valve cover assembly. The valve cover assembly surrounds the venting valve body, and the valve stem passes through the venting valve body. One end of the valve stem is fixed to the valve cover assembly.

[0006] Furthermore, the sealing section has an arched cross-section.

[0007] Furthermore, the valve cover assembly includes a cylinder, a cover plate, and a sealing ring for cooperating with the first sealing component. The cylinder surrounds the valve body, one end of the cover plate is fixed to one end of the cylinder to close one end of the cylinder, and the sealing ring is fixed to one end of the cover plate.

[0008] Furthermore, the sealing ring is made of carbon steel.

[0009] Furthermore, it also includes a guide sleeve assembly for guiding the valve stem, one end of which is fixed to the vent valve body, and the valve stem passes through the guide sleeve assembly and slides in cooperation with it.

[0010] Furthermore, the guide sleeve assembly includes a support arm and a guide sleeve. One end of the support arm is fixed to the inner wall of the vent valve body, and the other end of the support arm is fixed to the guide sleeve. The valve stem passes through the guide sleeve and slides with the guide sleeve.

[0011] The working process of this utility model is as follows: when the valve stem is not against the bottom of the storage tank, under the gravity of the valve cover assembly and the valve stem, the valve cover assembly moves downward along the axial direction of the vent valve body 1. When the sealing ring abuts against the sealing part, the sealing part limits the valve cover assembly, and the valve cover assembly cannot move further downward. At this time, the gravity of the valve cover assembly and the valve stem is loaded onto the sealing part, causing the sealing part to be compressed, and the valve cover assembly and the sealing part form a seal against the vent valve body.

[0012] Because the distance between the other end of the valve stem and the bottom of the tank is less than the distance between the other end of the outrigger and the bottom of the tank, when the valve stem abuts against the bottom of the tank, there is still a distance between the outrigger and the bottom of the tank. As the oil level drops, the float descends. At this time, the valve stem and valve cover assembly remain stationary, while the vent valve body and the first sealing component fixed on the vent valve body descend with the float. The first sealing component separates from the sealing ring, forming a channel for air to pass through between the valve cover assembly and the vent valve body. Air enters the space between the float and the tank along the channel and the through hole, thereby preventing the float from collapsing under negative pressure.

[0013] The first sealing component in this invention has a hollow structure. When the pressure of the valve cover assembly and the valve stem is applied to the sealing component, the sealing component can generate a large deformation, thereby improving the sealing performance. At the same time, since the sealing component has an arched structure, it is easy for the sealing component to rebound after the valve cover assembly separates from the sealing component, making it easy to reuse. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the vent valve when it is far from the bottom of the storage tank.

[0015] Figure 2 This is a schematic diagram showing the valve stem of the vent valve hitting the bottom of the storage tank.

[0016] Figure 3 for Figure 2 Enlarged view of part P in the image.

[0017] Figure 4 This is a schematic diagram of the first sealing component.

[0018] Ventilation valve body 1, through hole 1a, first sealing component 2, mounting part 2a, sealing part 2b, connecting groove 2c, hollow part 2d, valve stem 3, cylinder 4, cover plate 5, sealing ring 6, support arm 7, guide sleeve 8, channel 9, floating plate A, storage tank B. Detailed Implementation

[0019] like Figures 1 to 4 As shown, the vent valve for a floating roof of this utility model includes a vent valve body 1, a first sealing component 2, a valve cover assembly that cooperates with the first sealing component 2, and a valve stem 3. The vent valve body 1 is provided with a through hole 1a, making the vent valve body 1 cylindrical. A through hole is provided on the floating roof A. One end of the vent valve body 1 is inserted into the through hole on the floating roof A. The vent valve body 1 and the floating roof A are fixed by welding.

[0020] The first sealing component 2 is preferably made of rubber. The first sealing component 2 is annular and includes a mounting part 2a and a sealing part 2b. One end of the mounting part 2a is provided with a mating groove 2c. The end of the valve body 1 is inserted into the mating groove 2c. The valve body 1 and the mating groove 2c are preferably fitted with an interference fit, so that the valve body 1 and the first sealing component 2 are fixed together. After the other end of the mounting part 2a is fixed to the sealing part 2b, a hollow part 2d is formed between the mounting part 2a and the sealing part 2b, which allows the sealing part 2b to deform under the pressure of the valve cover assembly. In this utility model, the sealing part 2b has an arched cross section. Therefore, a hollow part 2d is formed between the sealing part 2b and the mounting part 2a.

[0021] The valve cover assembly surrounds the vent valve body 1. In this invention, the valve cover assembly includes a cylinder 4, a cover plate 5, and a sealing ring 6 for cooperating with the first sealing component 2. The cylinder 4 surrounds the valve body 1, one end of the cover plate 5 is fixed to one end of the cylinder 4 to close that end, and the sealing ring 6 is fixed to one end of the cover plate 5. The cylinder 4 and cover plate 5 are preferably made of stainless steel, and the sealing ring 6 is made of carbon steel.

[0022] Valve stem 3 passes through vent valve body 1. One end (upper end) of valve stem 3 is fixed to the valve cover assembly, and one end of support leg C is fixed to the lower end of floating plate A. When valve stem 3 is not against the bottom of storage tank B, the distance between the other end (lower end) of valve stem 3 and the bottom of storage tank B is less than the distance between the other end of support leg C and the bottom of storage tank B. Therefore, before support leg C against the bottom of storage tank B, valve stem 3 will first against storage tank B.

[0023] To prevent the valve cover assembly from wobbling due to the buoyancy of the oil, this invention also includes a guide sleeve assembly for guiding the valve stem 3. One end of the guide sleeve assembly is fixed to the vent valve body 1, and the valve stem 3 passes through the guide sleeve assembly and slides in cooperation with it. By restricting the valve stem 3 with the guide sleeve assembly, the valve stem 3 can only move along the axial direction of the vent valve body 1, preventing the valve stem 3 from swinging and thus preventing the valve cover assembly from wobbling. This ensures that the valve cover assembly can reliably press against the first sealing component 2 when the valve stem 3 is not against the bottom of the storage tank B.

[0024] The guide sleeve assembly includes a support arm 7 and a guide sleeve 8. One end of the support arm 7 is fixed to the inner wall of the vent valve body 1, and the other end of the support arm 7 is fixed to the guide sleeve 8. The valve stem 3 passes through the guide sleeve 8 and slides with the guide sleeve 8. The guide sleeve 8 is preferably arranged inside the vent valve body 1.

[0025] The working process of this utility model is as follows: When the valve stem 3 is not against the bottom of the storage tank B, under the gravity of the valve cover assembly and the valve stem 3, the valve cover assembly moves downward along the axial direction of the vent valve body 1. When the sealing ring 6 abuts against the sealing part 2b, the sealing part 2b limits the valve cover assembly, and the valve cover assembly cannot move further downward. At this time, the gravity of the valve cover assembly and the valve stem 3 is loaded onto the sealing part 2b, causing the sealing part 2b to be compressed, and the valve cover assembly and the sealing part 2b form a seal on the vent valve body 1.

[0026] Because the distance between the other end (lower end) of valve stem 3 and the bottom of tank B is less than the distance between the other end of support leg C and the bottom of tank B, when valve stem 3 comes into contact with the bottom of tank B, there is still a distance between support leg C and the bottom of tank B. As the oil level drops, float C descends. At this time, the positions of valve stem 3 and valve cover assembly remain unchanged, while vent valve body 1 and the first sealing component 2 fixed on vent valve body 1 descend with float C. The first sealing component 2 separates from the sealing ring 6, forming a channel 9 for air passage between valve cover assembly and vent valve body 1. Air enters the space between float C and tank B along channel 9 and through hole 1a, thereby preventing float C from collapsing under negative pressure.

Claims

1. A breather valve for a float tank, characterized in that The device includes a vent valve body (1), a first sealing component (2), a valve cover assembly that cooperates with the first sealing component (2), and a valve stem (3). The vent valve body (1) is provided with a through hole (1a). The first sealing component (2) is annular and includes a mounting part (2a) and a sealing part (2b). One end of the mounting part (2a) is provided with a connecting groove (2c). The end of the valve body (1) is inserted into the connecting groove (2c). After the other end of the mounting part (2a) is fixed to the sealing part (2b), a hollow part (2d) is formed between the mounting part (2a) and the sealing part (2b) to allow the sealing part (2b) to deform under the pressure of the valve cover assembly. The valve cover assembly surrounds the vent valve body (1). The valve stem (3) passes through the vent valve body (1) and one end of the valve stem (3) is fixed to the valve cover assembly.

2. The air vent for a sump according to claim 1, wherein The sealing part (2b) has an arched cross-section.

3. The air vent for a float tank according to claim 1 or 2, characterized in that The valve cover assembly includes a cylinder (4), a cover plate (5), and a sealing ring (6) for cooperating with the first sealing component (2). The cylinder (4) surrounds the valve body (1). One end of the cover plate (5) is fixed to one end of the cylinder (4) to close one end of the cylinder (4). The sealing ring (6) is fixed to one end of the cover plate (5).

4. The air vent for a sumptuary tray according to claim 3, characterized in that, The sealing ring (6) is made of carbon steel.

5. The air vent valve for a float pan of claim 1 or 2, wherein, It also includes a guide sleeve assembly for guiding the valve stem (3), one end of which is fixed to the vent valve body (1), and the valve stem (3) passes through the guide sleeve assembly and slides with the guide sleeve assembly.

6. The air vent for a sumptuary tray according to claim 5, characterized in that, The guide sleeve assembly includes a support arm (7) and a guide sleeve (8). One end of the support arm (7) is fixed to the inner wall of the vent valve body (1), and the other end of the support arm (7) is fixed to the guide sleeve (8). The valve stem (3) passes through the guide sleeve (8) and slides with the guide sleeve (8).

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