Low-temperature floating ball valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a low-temperature floating ball valve which is characterized by comprising a valve body, one side of the valve body is provided with a water inlet channel, and the other side of the valve body is provided with a water outlet channel; the valve element is arranged in the valve body, a through hole is formed in the valve element, a mounting hole is formed in the end, facing the water inlet channel, of the valve element, and the through hole communicates with the mounting hole; the valve rod is arranged on the valve body, and the valve seats are arranged on the two sides of the valve element; the pressure relief mechanism comprises a threaded plug, an elastic piece and a piston, the threaded plug is arranged at the end, facing the water inlet channel, of the mounting hole, the piston is arranged at the end, facing the through hole, of the mounting hole, the elastic piece is arranged between the threaded plug and the piston, and a drainage hole is formed in the threaded plug; the piston is used for controlling opening and closing of the mounting hole. The ball valve has the advantages that when the ball valve is closed and the medium in the valve element rises in the pipeline under the action of low temperature, the valve element can be effectively prevented from being quickly decompressed, the stability of the pressure in the pipeline is kept, the medium in the ball valve is prevented from leaking, and the safety of the ball valve is improved.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically refers to a low-temperature floating ball valve. Background Technology

[0002] Ball valves are a commonly used type of valve. Their main characteristic is that they control fluid flow by rotating a valve core. Ball valves are classified into floating ball valves, fixed ball valves, V-type ball valves, metal-sealed ball valves, and full-bore ball valves, among others. Floating ball valves are a special type of valve, designed to achieve sealing in two directions. Whether the pressure at the inlet or outlet of the medium is too high, the ball valve can effectively seal the flow of the medium, thus blocking its flow. The ball in a floating ball valve floats; under the pressure of the medium, the ball can shift and press firmly against the sealing surface at the outlet end, ensuring a seal at the outlet. This type of valve has a simple structure and good sealing performance.

[0003] However, when the floating ball valve controls the pipeline to close, the liquid medium will remain in the through hole of the valve core. In low-temperature pipeline systems, the physical properties of the medium may change at low temperatures, such as increased density, increased viscosity, or evaporation, which can easily lead to an abnormal increase in pressure inside the pipeline, causing medium leakage and other problems. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a low-temperature floating ball valve. This valve can effectively prevent rapid pressure relief of the valve core when the ball valve is closed and the pressure inside the valve core rises due to the low temperature, thus maintaining the stability of the pressure inside the pipeline, preventing leakage of the medium inside the ball valve, and improving the safety of the ball valve.

[0005] The purpose of this utility model is achieved as follows: a cryogenic floating ball valve, comprising:

[0006] The valve body has an inlet channel on one side and an outlet channel on the other side.

[0007] A valve core is disposed in the valve body, and the valve core has a through hole. The valve core has a mounting hole at one end facing the water inlet, and the through hole communicates with the mounting hole.

[0008] A valve stem is disposed on the valve body, with one end of the valve stem inserted into the valve body and connected to the valve core, and the other end extending outward from the valve body;

[0009] Valve seats are disposed on both sides of the valve core;

[0010] A pressure relief mechanism is provided in the mounting hole. The pressure relief mechanism includes a threaded plug, an elastic element, and a piston. The threaded plug is provided at the end of the mounting hole facing the water inlet, the piston is provided at the end of the mounting hole facing the through hole, and the elastic element is provided between the threaded plug and the piston. The threaded plug is provided with a drain hole.

[0011] A sealing mechanism is disposed between the valve stem and the valve body;

[0012] The piston is used to control the opening and closing of the mounting hole.

[0013] The present invention is further configured such that the mounting hole includes:

[0014] A pressure relief port is provided at the end of the mounting hole facing the through hole, and the inner diameter of the pressure relief port is smaller than the outer diameter of the piston.

[0015] The present invention is further configured such that the mounting hole also includes:

[0016] A control chamber is located on the side of the pressure relief port facing the water outlet, and the piston is located inside the control chamber, with the piston slidably connected to the inner wall of the control chamber;

[0017] A drain chamber is provided on the side of the control chamber facing the water outlet, and the inner diameter of the drain chamber is larger than the outer diameter of the piston.

[0018] The present invention is further configured such that: a limiting groove is provided at the end of the piston facing the elastic member, and the end of the elastic member facing the piston is inserted into the limiting groove.

[0019] The present invention is further configured such that the sealing mechanism includes:

[0020] A sealing cavity is provided between the valve body and the valve stem;

[0021] Multiple V-shaped sealing rings are disposed within the sealing cavity, and the multiple V-shaped sealing rings are stacked.

[0022] The present invention is further configured such that the sealing mechanism also includes:

[0023] A retaining ring is disposed at the bottom of the sealing cavity, and the top of the retaining ring abuts against the bottom of the V-shaped sealing ring.

[0024] The present invention is further configured such that: the valve stem is provided with a handle, and the handle is located at the end of the valve stem away from the valve core.

[0025] By adopting the above technical solution, this utility model has at least the following beneficial effects:

[0026] 1. An installation hole is provided on the side of the valve core facing the inlet channel. A threaded plug, a resilient element, and a piston are installed in the installation hole. When the valve core rotates and closes, liquid medium will be present in the through-hole of the valve core. The piston, positioned at the end of the installation hole facing the through-hole, prevents the liquid medium in the through-hole from flowing out. When the density of the liquid medium increases or it evaporates at low temperatures, the pressure in the through-hole increases. At this time, the piston is pressed towards the inlet channel, and the resilient element is compressed. The medium in the through-hole can then enter the installation hole and flow from the drain hole of the threaded plug to the outlet channel, thereby reducing the pressure in the through-hole. When the pressure in the through-hole decreases, the resilient element provides a spring force to the piston in the direction of the through-hole, causing the piston to return to its original position and re-close the installation hole, achieving a pipeline seal. The threaded plug, resilient element, and piston work together to relieve pressure in the through-hole when the pressure is too high, improving the safety of the ball valve pipeline and preventing medium leakage.

[0027] 2. The mounting hole includes a pressure relief port, a control chamber, and a drain chamber. In the initial state, the piston can block the pressure relief port, and the inner wall of the control chamber is slidably connected to the outer wall of the piston. At this time, the piston can prevent the liquid medium in the through hole from passing through the mounting hole. When the pressure in the through hole of the valve core is too high, the piston is forced to move towards the water inlet. When the piston moves into the drain chamber, the liquid medium in the through hole can pass through the control chamber, enter the drain chamber, and flow out from the drain hole on the threaded plug, thus achieving the effect of pressure relief. This effectively reduces the pressure in the through hole, prevents excessive pressure in the through hole from causing medium leakage, and improves the safety of the floating ball valve.

[0028] 3. The sealing mechanism is located above the valve core. The sealing mechanism includes a sealing cavity, a V-shaped sealing ring, and a retaining ring. Multiple V-shaped sealing rings are stacked to form a redundant sealing structure, which can improve the sealing performance of the valve stem. The retaining ring is located at the bottom of the sealing ring, and the top of the retaining ring abuts against the bottom of the V-shaped sealing ring. This can increase the deformation of the V-shaped sealing ring, making the two sides of the V-shaped sealing ring contact the inner wall of the sealing cavity more tightly, improving the sealing effect. At the same time, it provides support for the V-shaped sealing ring, maintains the structural stability of the multi-layer V-shaped sealing ring, and thus improves the stability of the sealing capability. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the cryogenic floating ball valve of this utility model;

[0030] Figure 2 This is an enlarged view of part A of this utility model;

[0031] Figure 3 This is an enlarged view of Part B of this utility model;

[0032] Figure 4 This is a schematic diagram of the pressure relief mechanism of this utility model;

[0033] The attached figures are labeled as follows: 1-valve body, 2-valve core, 3-valve stem, 4-valve seat, 21-through hole, 22-mounting hole, 31-handle, 41-inlet channel, 42-outlet channel, 51-threaded plug, 52-elastic element, 53-piston, 54-limiting groove, 55-drain hole, 61-sealing cavity, 62-V-shaped sealing ring, 63-clamping ring, 221-pressure relief port, 222-control cavity, 223-drain cavity. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0035] In the description of this application, 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. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further described in subsequent drawings.

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :

[0037] Example 1.

[0038] This embodiment provides a cryogenic floating ball valve, including:

[0039] Valve body 1, with an inlet channel 41 on one side and an outlet channel 42 on the other side;

[0040] Valve core 2 is located inside valve body 1. Valve core 2 has a through hole 21 and a mounting hole 22 at the end of valve core 2 facing water inlet channel 41. The through hole 21 is connected to the mounting hole 22.

[0041] Valve stem 3 is mounted on valve body 1. One end of valve stem 3 is inserted into valve body 1 and connected to valve core 2, while the other end extends outward from valve body 1.

[0042] Valve seat 4 is located on both sides of valve core 2;

[0043] The pressure relief mechanism is installed in the mounting hole 22. The pressure relief mechanism includes a threaded plug 51, an elastic element 52 and a piston 53. The threaded plug 51 is installed at the end of the mounting hole 22 facing the water inlet 41, the piston 53 is installed at the end of the mounting hole 22 facing the through hole 21, the elastic element 52 is installed between the threaded plug 51 and the piston 53, and the threaded plug 51 is provided with a drain hole 55.

[0044] A sealing mechanism is provided between the valve stem 3 and the valve body 1;

[0045] The piston 53 is used to control the opening and closing of the mounting hole 22.

[0046] like Figure 1-4 As shown, the valve body 1 has an inlet channel 41 on one side and an outlet channel 42 on the other side. The liquid medium can enter the ball valve through the inlet channel 41 and flow out through the outlet channel 42. The valve core 2 is set inside the valve body 1. The valve core 2 is spherical and can rotate inside the valve body 1, thereby controlling the opening and closing of the ball valve pipeline. One end of the valve stem 3 is inserted into the valve core 2, and the other end is set outside the valve body 1. The valve stem 3 is used to control the rotation of the valve core 2, thereby controlling the opening and closing of the ball valve.

[0047] Valve seat 4 is located inside valve body 1 and is positioned on both sides of valve core 2. Valve seat 4 and valve core 2 can fit tightly together to form a seal. When the ball valve is in the closed state, under the action of medium pressure, valve core 2 is pushed onto valve seat 4 at the end facing the outlet channel 42. The sealing surface of valve seat 4 is in close contact with the surface of valve core 2, which can prevent medium leakage and ensure the sealing performance of the pipeline system.

[0048] The valve seat 4 also serves to support the valve core 2, allowing the valve core 2 to rotate and float stably between the two valve seats 4. During changes in medium pressure or ball valve operation, the valve seat 4 can withstand the weight of the valve core 2 and the force exerted by the medium on the valve core 2, ensuring the stability of the valve core 2's position and ensuring the normal opening and closing of the ball valve.

[0049] The valve core 2 is provided with a mounting hole 22. When the ball valve is closed, the mounting hole 22 faces the end of the water inlet channel 41. Liquid medium that has not flowed out of the water outlet channel 42 will exist in the through hole 21 of the valve core 2. The mounting hole 22 is provided with a pressure relief mechanism, which includes a threaded plug 51, an elastic element 52 and a piston 53. The piston 53 is provided at the end of the mounting hole 22 facing the through hole 21. The piston 53 can block the mounting hole 22 to prevent the water inlet channel 41 from communicating with the through hole 21 through the mounting hole 22. The threaded plug 51 is provided at the end of the mounting hole 22 facing the water inlet channel 41. The end of the mounting hole 22 facing the water inlet channel 41 is provided with threads. The threaded plug 51 is threadedly connected to the valve core 2. The threaded plug 51 is provided with a through hole 21.

[0050] The elastic element 52 is disposed between the threaded plug 51 and the piston 53. One end of the elastic element 52 abuts against the threaded plug 51 and the other end abuts against the piston 53. The elastic element 52 can provide elastic force to the piston 53 in the direction of the through hole 21. When the density of the liquid medium in the through hole 21 increases or evaporates in a low temperature environment, the pressure in the through hole 21 increases. At this time, the piston 53 is compressed and moves towards the water inlet 41. The elastic element 52 is compressed. At this time, the medium in the through hole 21 can enter the mounting hole 22 and flow from the drain hole 55 of the threaded plug 51 to the water outlet 42, thereby reducing the pressure in the through hole 21.

[0051] When the pressure inside the through hole 21 decreases, the elastic element 52 provides elastic force to the piston 53 in the direction of the through hole 21, causing the piston 53 to reset, thereby causing the piston 53 to close the mounting hole 22 again, thus achieving pipe sealing.

[0052] The mounting hole 22, threaded plug 51, elastic element 52, and piston 53 work together to relieve pressure in the through hole 21 when the pressure inside the through hole 21 is too high, thereby improving the safety of the ball valve pipeline and preventing leakage of the ball valve medium.

[0053] When the ball valve is open, the central axis of the mounting hole 22 is perpendicular to the central axis of the water inlet 41, and the ball valve works normally at this time.

[0054] The sealing mechanism is located between the valve stem 3 and the valve body 1, and is positioned above the valve core 2. This prevents liquid medium from leaking from the valve stem 3, further improving the safety of the floating ball valve.

[0055] Example 2:

[0056] This embodiment provides a cryogenic floating ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0057] Mounting hole 22 includes:

[0058] The pressure relief port 221 is located at the end of the mounting hole 22 facing the through hole 21, and the inner diameter of the pressure relief port 221 is smaller than the outer diameter of the piston 53.

[0059] like Figure 1-2 As shown in Figure 4, the inner diameter of the pressure relief port 221 is smaller than the outer diameter of the piston 53. This can prevent the piston 53 from coming out of the pressure relief port 221 and entering the through hole 21 when the pressure in the water inlet 41 is too high, thus affecting the pressure relief capacity of the pressure relief mechanism and improving the stability of the pressure relief function of the pressure relief mechanism.

[0060] Mounting hole 22 also includes:

[0061] The control chamber 222 is located on the side of the pressure relief port 221 facing the water outlet 42. The piston 53 is located inside the control chamber 222 and is slidably connected to the inner wall of the control chamber 222.

[0062] The drain chamber 223 is located on the side of the control chamber 222 facing the water outlet 42, and the inner diameter of the drain chamber 223 is larger than the outer diameter of the piston 53.

[0063] like Figure 1-2 As shown in Figure 4, the control chamber 222 cooperates with the piston 53 to block the connection between the through hole 21 and the water inlet channel 41. The drain chamber 223 is located on the side of the control chamber 222 facing the water outlet channel 42. The inner diameter of the drain chamber 223 is larger than the outer diameter of the piston 53. When the pressure in the through hole 21 is too high, the piston 53 is pressured and moves towards the drain chamber 223 in the control chamber 222. At this time, the elastic element 52 is compressed. After the piston 53 enters the drain chamber 223, the liquid medium in the through hole 21 can enter the control chamber 222 through the pressure relief port 221, and then enter the drain chamber 223. It enters the water outlet channel 42 through the drain hole 55 on the threaded plug 51, thereby reducing the pressure in the through hole 21. When the pressure in the through hole 21 drops to the normal value, the elastic element 52 provides pressure to the piston 53 in the direction of the through hole 21, causing the piston 53 to reset, re-enter the control chamber 222, and close the mounting hole 22.

[0064] The piston 53 has a limiting groove 54 at the end facing the elastic member 52, and the end of the elastic member 52 facing the piston 53 is inserted into the limiting groove 54.

[0065] like Figure 1-2 As shown in Figure 4, the limiting groove 54 can limit the piston 53 and the elastic element 52. The limiting groove 54 is annular. When the piston 53 moves in the control cavity 222, the pressure is relatively small. The limiting groove 54 can limit the elastic element 52 to prevent the elastic element 52 from shifting in position in the control cavity 222.

[0066] When piston 53 enters drain chamber 223, piston 53 and elastic element 52 are subjected to greater pressure. Limiting groove 54 can limit piston 53 to prevent piston 53 from shifting in position within drain chamber 223, thus preventing it from entering control chamber 222 during reset and improving the stability of pressure relief mechanism during operation.

[0067] Example 3:

[0068] This embodiment provides a cryogenic floating ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0069] The sealing mechanism includes:

[0070] A sealing cavity 61 is disposed between the valve body 1 and the valve stem 3;

[0071] Multiple V-shaped sealing rings 62 are disposed within the sealing cavity 61, and the multiple V-shaped sealing rings 62 are stacked.

[0072] like Figure 1 , 3 As shown, the sealing mechanism is located above the valve core 2. The sealing mechanism includes a sealing cavity 61 and a V-shaped sealing ring 62. Multiple V-shaped sealing rings 62 are stacked to form a redundant sealing structure. When the bottom V-shaped sealing ring 62 leaks slightly due to wear, aging or accidental damage, the upper sealing ring continues to play a sealing role, ensuring that the ball valve maintains good sealing performance during long-term use and extending the service life of the sealing mechanism.

[0073] The sealing mechanism also includes:

[0074] An abutment ring 63 is located at the bottom of the sealing cavity 61, with the top of the abutment ring 63 abutting against the bottom of the V-shaped sealing ring 62.

[0075] like Figure 1 , 3 As shown, the clamping ring 63 is located at the bottom of the sealing ring, and the top of the clamping ring 63 abuts against the bottom of the bottommost V-shaped sealing ring 62. This can increase the deformation of the V-shaped sealing ring 62, making the two sides of the V-shaped sealing ring 62 contact the inner wall of the sealing cavity 61 more tightly, thus improving the sealing effect. At the same time, it provides support for the multi-layered V-shaped sealing rings 62, maintaining the structural stability of the multi-layered V-shaped sealing rings 62, thereby improving the stability of the sealing capability.

[0076] A handle 31 is provided on the valve stem 3, and the handle 31 is located at the end of the valve stem 3 away from the valve core 2.

[0077] like Figure 1 As shown, the handle 31 is connected to the valve stem 3. The user can grasp the handle 31 and control the valve stem 3 to rotate, thereby controlling the opening and closing of the ball valve. The handle 31 has a large torque, which makes it easier for the user to control the opening and closing of the ball valve.

[0078] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A cryogenic floating ball valve, characterized in that, include: The valve body (1) has an inlet channel (41) on one side and an outlet channel (42) on the other side. A valve core (2) is disposed inside the valve body (1). The valve core (2) has a through hole (21) and an installation hole (22) is provided at one end of the valve core (2) facing the water inlet (41). The through hole (21) communicates with the installation hole (22). A valve stem (3) is disposed on the valve body (1). One end of the valve stem (3) is inserted into the valve body (1) and connected to the valve core (2), and the other end extends outward from the valve body (1). Valve seats (4) are disposed on both sides of the valve core (2); A pressure relief mechanism is provided in the mounting hole (22). The pressure relief mechanism includes a threaded plug (51), an elastic element (52), and a piston (53). The threaded plug (51) is provided at one end of the mounting hole (22) facing the water inlet (41). The piston (53) is provided at one end of the mounting hole (22) facing the through hole (21). The elastic element (52) is provided between the threaded plug (51) and the piston (53). The threaded plug (51) is provided with a drain hole (55). A sealing mechanism is disposed between the valve stem (3) and the valve body (1); The piston (53) is used to control the opening and closing of the mounting hole (22).

2. The cryogenic floating ball valve according to claim 1, characterized in that, The mounting hole (22) includes: A pressure relief port (221) is provided at one end of the mounting hole (22) facing the through hole (21), and the inner diameter of the pressure relief port (221) is smaller than the outer diameter of the piston (53).

3. The cryogenic floating ball valve according to claim 2, characterized in that, The mounting hole (22) also includes: A control chamber (222) is provided on the side of the pressure relief port (221) facing the water outlet (42), and a piston (53) is provided in the control chamber (222). The piston (53) is slidably connected to the inner wall of the control chamber (222). A drain chamber (223) is provided on the side of the control chamber (222) facing the water outlet (42), and the inner diameter of the drain chamber (223) is larger than the outer diameter of the piston (53).

4. The cryogenic floating ball valve according to claim 3, characterized in that, The piston (53) has a limiting groove (54) at one end facing the elastic member (52), and the elastic member (52) is inserted into the limiting groove (54) at one end facing the piston (53).

5. The cryogenic floating ball valve according to claim 1, characterized in that, The sealing mechanism includes: A sealing cavity (61) is disposed between the valve body (1) and the valve stem (3); Multiple V-shaped sealing rings (62) are disposed in the sealing cavity (61), and the multiple V-shaped sealing rings (62) are stacked.

6. The cryogenic floating ball valve according to claim 5, characterized in that, The sealing mechanism further includes: A clamping ring (63) is disposed at the bottom of the sealing cavity (61), and the top of the clamping ring (63) abuts against the bottom of the V-shaped sealing ring (62).

7. The cryogenic floating ball valve according to claim 1, characterized in that, The valve stem (3) is provided with a handle (31), which is located at the end of the valve stem (3) away from the valve core (2).

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