Two-way ball valve with cryogenic base

Abstract

The invention relates to a bidirectional ball valve with cryogenic base, comprising: a valve body (1) with inlet and outlet pipes (2, 2'); a ball (3) with a through hole (3.1); at least one closing base (4) located in one of the pipes (2, 2'), with a closing sealing gasket (5) resting against the wall (6) of the internal cavity in which the ball (3) is arranged, the gasket (5) having a first end (5.2), a second end (5.3) and an intermediate portion (5.1) protruding from a housing (7) and contacting the ball (3), the first end (5.2) being arranged in a first chamber (7.1) of the housing (7), the first end having a first annular lip (5.21) contacting the wall (6) under the action of a first spring (8.1) to close the passage of fluid from the first pipe (2), and the second end comprising a second annular lip (5.31) contacting the wall (6) under the action of a second spring (8.2) to close the passage of fluid from the second pipe (2').

Description

Technical Field

[0001] This invention relates to ball valves for fluid pipelines, and more particularly to valves operating at low temperatures, by providing a valve that effectively achieves perfect sealing conditions under bidirectional operation. Background Technology

[0002] Ball valves are commonly used in fluid pipelines. A ball valve includes a ball with a hole through it and is disposed in an internal cavity of the valve body corresponding to the spherical surface of the ball, between the valve's inlet and outlet pipes, so that fluid flow between the valve's inlet and outlet pipes can be interrupted and established by rotating the ball.

[0003] In order to establish a seal between the ball and the wall of the internal cavity in which the ball is located, ensuring perfect valve function, a closing base formed by a gasket made of elastic material is usually placed between the wall of the ball housing and the ball surface around the inner port of each of the valve's inlet and outlet pipes to accommodate possible irregularities in the shape of the ball and thus prevent valve leakage.

[0004] However, at extremely low temperatures, the elastic material of the gasket hardens and loses the elasticity required to adapt to the irregularity of the valve ball. At such low temperatures, the ball will deform and become elliptical or irregular in shape due to the non-linear shrinkage of the metal material or the material dissimilarity between the ball, valve body and elastic material, which all have different mechanical characteristics and shrinkage / expansion coefficients.

[0005] Therefore, in conventional ball valve applications at low temperatures (-29°C to -196°C), the shut-off base between the rotating ball and the corresponding internal cavity wall loses its tightness, resulting in leakage. Consequently, the valve is not efficient at these temperatures.

[0006] A known solution involves inserting a sealing gasket into a receptacle within the wall of an internal cavity in which the sphere is housed, the internal cavity having a portion protruding from the receptacle to contact the sphere. When a tight seal cannot be ensured due to temperature variations or deformation, the sealing gasket is pressed against the surface of the sphere by a set of springs, thereby establishing a seal.

[0007] However, while this solution ensures contact between the gasket and the ball, it has been found that at low temperatures, fluid may leak through the contact between the gasket and the internal cavity, that is, at the point of contact between the gasket and the wall where the gasket is inserted in the housing.

[0008] To address the aforementioned problems, European patent application EP16380039.4, filed by the same applicant as this invention, discloses a ball valve with a closing base, wherein a sealing gasket includes an annular lip that is held in a receiving portion of the sealing gasket and contacts the valve body under pressure applied by a spring. Therefore, contact between the sealing gasket and the ball, as well as contact between the sealing gasket and the valve body, are guaranteed, thereby providing the required tight seal.

[0009] However, when the ball valve is bidirectional, a shut-off base must be positioned at the inner opening of both the inlet and outlet pipes of the valve, because the previous solution is ineffective when the fluid flow is directed in the opposite direction. However, this creates a problem: during normal operation, from opening to closing, fluid may become trapped in the internal cavity between the two shut-off bases. In this case, due to operation at low temperatures, pressure increases in the cavity, creating overpressure, which the aforementioned solution cannot effectively maintain.

[0010] Given the aforementioned drawbacks or limitations of existing solutions, a solution is needed that allows for tight sealing in both fluid flow directions of a two-way valve, eliminates the possibility of overpressure in the valve cavity, and requires only a shut-off base in at least one of the inlet and outlet ports of the ball valve. Summary of the Invention

[0011] To achieve this goal and solve the technical problems discussed to date, in addition to providing additional advantages that can be derived later, the present invention provides a bidirectional ball valve with a cryogenic base, comprising:

[0012] The valve body has a first fluid inlet pipe and a second fluid outlet pipe;

[0013] A ball having a through hole is disposed in an internal cavity of the valve body between the inlet and outlet pipes, and the ball is rotatable between a connection position that connects the through hole to the inlet / outlet pipes and a position that interrupts the passage between the inlet and outlet pipes.

[0014] A closing base, disposed in a first tube and / or a second tube, includes a sealing gasket inserted into a receiving portion defined within the wall of an internal cavity in which the sphere is disposed, the sealing gasket comprising:

[0015] The middle section protrudes from the receiving part and contacts the ball to close the fluid passage through the contact between the sealing gasket and the ball;

[0016] A first end portion defines a first chamber of a receiving portion between a wall and the first end portion. A first spring of a closing base is disposed in the first chamber portion. The first spring presses the first annular lip of the first end portion of the sealing gasket against the wall to close the fluid passage at the contact point between the gasket and the wall, thereby establishing fluid passage from the first tube to the first chamber of the receiving portion only between the wall of the inner cavity of the valve body and the sealing gasket.

[0017] The sealing gasket includes a second end portion that defines a second chamber for receiving portion between the wall and the second end portion. A second spring of the closing base is disposed in the second chamber. The second spring presses the second annular lip of the second end portion of the sealing gasket against the wall, so that fluid from the second pipe passes through the contact point between the sealing gasket and the wall, thereby allowing fluid to pass from the second pipe to the second chamber only between the wall of the internal cavity of the valve body and the sealing gasket.

[0018] The closing base is located at the contact point between the ball and the metal body of the valve, so that with this construction, a tight seal can be guaranteed with only a single base, thereby obtaining a bidirectional valve that allows for a tight seal of flow in both directions.

[0019] With this construction, the pressure exerted by the spring on the first annular lip of the washer ensures contact between the washer and the wall of the internal cavity of the valve body. In this way, leakage is prevented from occurring in the cavity defining the leakage chamber between the first tube and the valve body and the ball. Furthermore, relative to the spring pressure, the fluid penetrating the first cavity of the receiving portion exerts an additional pressure on the first annular lip, which strengthens the contact between the washer and the inner wall of the valve body, as well as the contact between the washer and the ball.

[0020] Furthermore, the second annular lip included in the gasket, on the opposite side of the first end of the gasket in the middle region for contacting the ball, ensures contact between the gasket and the wall of the inner cavity of the valve body, thereby closing the flow of fluid from the second pipe when fluid circulates from the second pipe to the first pipe. In this case, similar to what happens in the first chamber, the force exerted by the fluid penetrating the second chamber applies additional pressure to the second lip, thereby strengthening the contact between the gasket and the inner wall of the valve body, as well as the contact between the sealing gasket and the ball. This ensures the bidirectional tightness of the ball valve.

[0021] Achieving a tight seal with the bidirectional characteristics indicated for a ball valve using only a single base results in a significant reduction in manufacturing costs and ease of assembly. Furthermore, it avoids the overpressure problems that can arise in known solutions that use two shut-off bases, where fluid may stagnate in a leaky chamber between the ball and the ball body. This stagnation of fluid between the two bases exerts overpressure under cryogenic conditions, which weakens the tightness of the shut-off base. This invention results in a cavity-less valve, i.e., a valve body without dead chambers where fluid can accumulate, due to the presence of a shut-off base only in one tube, while fluid flows freely in the other.

[0022] According to one aspect of the invention, the gasket preferably has a first annular lip with a longitudinal configuration disposed in a direction parallel to the first tube, i.e., extending in a generally horizontal plane, while the second annular lip with the gasket preferably has a longitudinal configuration disposed at an angle relative to the first annular lip, or even preferably perpendicular to the first annular lip, i.e., in a generally vertical manner.

[0023] This configuration allows for greater pressure exerted by the fluid on the gasket and enables the resulting force component to ensure greater contact between the gasket lip and the inner wall of the valve body, as well as between the gasket and the ball. Therefore, despite deformation caused by low temperatures, a tighter seal is achieved in both fluid circulation directions.

[0024] Due to pressure, deformation, and / or contraction caused by low temperatures, the gasket can contact the inner wall of the valve body as fluid flows from the pipe into the first chamber, preventing continuous fluid flow into the first chamber. To ensure permanent fluid flow from the first pipe into the first chamber, the first end of the sealing gasket is intended to include at least one transverse recess that defines a permanent passage for fluid flow between the gasket and the inner wall of the valve body.

[0025] With this construction, fluid continuously permeates the first chamber from the first tube, and the resulting pressure exerts a force on the first annular lip and the gasket. The gasket thus presses against the inner wall of the valve body and the ball, thereby providing additional force to the first spring to achieve a tight seal. This does not occur in known ball valves, where, due to the shape of the gasket, there are circumferential grooves for fluid passage that can be closed by pressure or deformation, and the gasket contacts the inner wall of the valve body, preventing this synergistic effect of fluid pressure.

[0026] Similar to the first chamber, fluid flow can also be shut off in the second chamber for the reasons described above. Since fluid flow from the second pipe to the second chamber is blocked, no fluid pressure is generated to press the gasket against the inner wall of the valve body and the ball in synergy. This cannot ensure proper tightness, and in this case, leakage may occur due to material deformation under low-temperature conditions. To allow continuous fluid flow from the second pipe to the second chamber, the second end of the gasket is intended to include at least one transverse external recess that defines a permanent channel for fluid flow into the second chamber.

[0027] The recessed portion ensures that fluid enters the second chamber from the second pipe when the valve is operated in the opposite direction, thus allowing for a tight seal.

[0028] According to one aspect of the invention, the second end of the sealing gasket may include a third annular lip opposite to the second annular lip, which contacts the wall of the receiving portion and, together with the second annular lip, defines a receiving portion for the second spring.

[0029] The third annular lip of the sealing gasket can be used as a base for the second spring on one hand and as a mechanical stop against the wall of the receiving part on the other hand. The stop restricts the bending of the gasket after it is installed and subjected to fluid pressure and the stress of the ball, thereby controlling the displacement caused by bending to be too large, which can cause the gasket to break, especially at low temperatures.

[0030] On the other hand, considering the large valve size, the third annular lip, preferably having an inclined section, facilitates insertion. This is because the insertion is achieved gradually, such that, taking into account the shrinkage of the material at low temperatures, the outer diameter of the third annular lip always remains larger than the mating part of the base, thereby ensuring a tight seal against leakage.

[0031] According to one aspect of the invention, the gasket of the ball valve includes a plurality of inner and outer recesses, preferably four recesses at each end of the gasket.

[0032] More preferably, the inner and outer recesses are arranged at an angularly dispersed position in the axial direction, which corresponds to the imaginary axis of the gasket, which is aligned with the direction of the pipe. This results in a better distribution of fluid pressure and thus a better seal between the valve body and the ball in the base. Attached Figure Description

[0033] Figure 1 A perspective view of the ball valve object of the present invention is shown, wherein partial cuts are made to visualize one of the two junctions between the ball and the valve body, in which the closing base is located.

[0034] Figure 2A front cross-sectional view of the valve is shown, in which the shut-off base is visible only in the left port of the ball valve.

[0035] Figure 3 The details of the ball valve are shown in a cross-sectional view, in which the cavity or leakage chamber between the ball and the valve body is visible, through which the fluid passes when it circulates from the second pipe to the first pipe.

[0036] Figure 4 It shows Figure 3 The magnified details shown by the dashed lines include a cross-sectional view of the washer through one of the recesses at the first end of the washer.

[0037] Figure 5 A cross-sectional view is shown in the case of one of the outer recesses of the third annular lip passing through the washer. Figure 3 Zoomed-in details.

[0038] Figure 6 This is a perspective view of the sealing gasket, showing multiple inner and outer recesses in alternating axial positions.

[0039] Figure 7 Enlarged details of the outer recess of the third annular lip of the sealing gasket are shown.

[0040] Figure 8 Enlarged details of the recessed portion at the first end of the sealing gasket are shown.

[0041] Figure 9 A front view of the sealing gasket is shown.

[0042] Figure 10 Enlarged details of a second base are shown in the case where the base includes two contact points between the body and the sphere, the second base being constructed according to embodiments known in the prior art.

[0043] Figure 11 A front cross-sectional view of the valve is shown, in which the shut-off bases located at the two ports of the ball valve are visible. Detailed Implementation

[0044] A preferred exemplary embodiment of the invention can be observed from the above figures and from the reference numerals used, which includes the parts and elements shown and described in detail below.

[0045] Figure 1A ball valve is shown, wherein a ball (3) is mounted in the internal cavity of a valve body (1). The ball (3) is located between a first inlet pipe (2) and a second outlet pipe (2'). The ball valve is bidirectional, allowing the ball (3) to rotate between a position where the pipes (2, 2') are connected via a through-hole (3.1) in the ball (3) and a position where the flow of fluid between the inlet / outlet pipes (2, 2') is interrupted.

[0046] Figure 2 A cross-sectional view of the ball valve is shown, in which a contact fit is visible between the ball (3) and an internal cavity in which the ball (3) is positioned in the left opening of the pipe (2). For the actual exemplary embodiment described, only one shut-off base (4) is provided in the left opening of the pipe (2), thereby allowing fluid to pass freely through the other opening.

[0047] Considering that the fluid circulates from left to right, when the flow direction is reversed, i.e., from right to left, the second pipe (2') will become the inlet pipe, such that if the gasket in the right port is not provided, the fluid will leak through the leakage chamber (10) into the internal cavity of the valve body, such as Figure 3 As shown.

[0048] Figure 4 , Figure 5 , Figure 6 and Figure 9 The invention provides a detailed description of the shut-off base (4) of the present invention, which ensures a tight seal of the ball valve in both fluid flow directions, and which provides a fully tight bidirectional valve by having a shut-off base (4) in only one of the openings.

[0049] Therefore, as Figure 3 As shown, the closed base (4) indicated by the dashed line is included in the left opening. Figure 4 Details of the closing base (4) are shown, which includes a receiving portion (7) in which a sealing gasket (5) is disposed. The sealing gasket (5) is fitted into the receiving portion (7), with its first end (5.2) received in a first chamber (7.1). The first chamber (7.1) is preferably rectangular in construction and configured to be parallel to the first tube (2), i.e., substantially horizontal, such that the first end (5.2) of the sealing gasket (5) and the inner wall (6) of the valve body (1) define the space of the first chamber (7.1).

[0050] In the first chamber (7.1), a first spring (8.1) is disposed between the lower wall of the chamber (7.1) and the first annular lip (5.21) of the first end (5.2) of the sealing gasket (5), the first annular lip extending longitudinally parallel to the first tube (2). The first spring (8.1) presses the first annular lip (5.21) against the upper surface of the first chamber (7.1), that is, against the inner wall (6.1) of the valve body (1), thereby maintaining contact between the gasket and the valve body and preventing fluid from passing through.

[0051] The sealing gasket (5) includes a middle portion (5.1) that protrudes from the receiving portion (7) and contacts the ball (3).

[0052] In this way, when the fluid flows from left to right, the fluid is prevented from passing through the contact point between the middle portion (5.1) of the sealing gasket (5) and the ball (3). Furthermore, when the fluid flows from the first pipe (2) to the first chamber (7.1), the passage between the sealing gasket (5) and the inner wall (6) of the valve body (1) is closed by the action of the first annular lip (5.21) of the sealing gasket (5), which is held against the wall (6.1) by the action of the first spring (8.1). Therefore, tightness in the flow direction from the first pipe (2) to the second pipe (2') is ensured.

[0053] The spring (8.1) is preferably a hollow spring, and more preferably has an internal reinforcement (11) that prevents the spring from deforming under fluid pressure. Therefore, the pressure on the first lip (5.21) is held against the wall (6.1) of the receiving portion (7).

[0054] Therefore, fluid leakage caused by deformation of the ball (3), valve body and sealing gasket (5) due to the low temperature at which the operation takes place can be prevented by ensuring contact between the sealing gasket (5) and the inner wall (6) of the ball (3) and valve body (1), thereby providing a completely tight seal in the fluid from the first pipe (2) to the second pipe (2').

[0055] However, as has occurred in known embodiments, the sealing gasket (5) can be attached to the lower surface of the first chamber (7.1), thereby preventing the continuous flow of fluid into the first chamber (7.1). To avoid this, as Figure 4 , Figure 6 , Figure 8 and Figure 9As shown, the first end (5.2) of the sealing gasket (5) preferably includes at least one recess (9.1), and even more preferably four equally spaced recesses (9.1), which provide a permanent passage for the continuous flow of fluid from the first tube (2) to the first chamber (7.1) in the region for fluid passage between the gasket (5) and the wall (6) of the receiving portion, wherein the passage preferably passes through the inclined protrusion of the receiving portion (7) and the inclined surface configuration corresponding to the end (5.2) of the gasket (5). Thus, the first end (5.2) of the sealing gasket makes contact along its entire circumferential periphery except for the recesses (9.1) for continuous fluid passage.

[0056] This arrangement allows for continuous flow of fluid into the first chamber (7.1), causing the fluid to exert additional pressure on the first annular lip (5.21), thereby ensuring a tight seal between the wall (6) and the sealing gasket (5) to a greater extent. Similarly, the pressure is applied in the direction of contact between the sealing gasket (5) and the ball (3), further ensuring a tight seal at that point.

[0057] In order to enable the valve to be a two-way valve while maintaining tightness with a single base (4), the sealing gasket (5) includes a second end (5.3) adjacent to the intermediate portion (5.1), which is fitted into the second chamber (7.2).

[0058] The second end portion (5.3) includes a second annular lip (5.31) that projects longitudinally at an angle relative to the first annular lip (5.21), preferably perpendicular to each other. Similarly, the second chamber (7.2) is preferably disposed perpendicular to the first chamber (7.1), with the second annular lip (5.31) contacting the left side surface of the second chamber (7.2). The second annular lip (5.31) defines a receiving portion for the second spring (8.2) between the third annular lip (5.32) and the second annular lip (5.31), as shown in FIG. (5). The thickness of the second end portion (5.3) of the washer (5) is preferably greater than that of the third lip (5.32) to ensure contact between the receiving portion wall (6) and the third lip (5.32).

[0059] The second spring (8.2) presses the second annular lip (5.31) so that it bends against the inner wall (6.2) of the receiving part (7). As shown in Figure (5), the base of the second annular lip (5.31) is provided with a groove (12), which not only helps the production process of the sealing gasket (5) but also reduces the stress at that point due to the bending of the second annular lip (5.31).

[0060] Therefore, in the flow direction from the second pipe (2') to the first pipe (2), the fluid leaks from the second pipe (2') to the closing base (4) through the leakage chamber (10). In this case, without excessive deformation, the third annular lip (5.32) prevents the fluid from passing through the second chamber (7.2) by maintaining contact with the receiving portion (7), particularly with the upper surface of the second chamber (7.2). Thus, a seal against fluid passage is established between the sealing gasket (5) and the inner wall (6) of the valve body (1), which, together with the intermediate portion (5.2), prevents the fluid from passing through the first pipe (2).

[0061] like Figure 4 and Figure 5 As can be seen, the third annular lip (5.32) is inclined, and its diameter decreases along the placement direction of the gasket (5) in the receiving portion (7). The third annular lip (5.32) serves as a mechanical stop, restricting the bending of the base, ensuring operation, and preventing breakage. In this way, the third annular lip (5.32) facilitates the insertion of the sealing gasket (5) into the receiving portion (7) without the need for additional mounting components and ensures contact is maintained taking into account the material shrinkage at low temperatures.

[0062] like Figure 5 , Figure 6 , Figure 7 and Figure 9 It is evident that, in order to achieve fluid pressure to enhance the contact between the second annular lip (5.31) and the inner wall (6.2) of the valve body (1), as well as the contact between the sealing gasket (5) and the ball (3), and the contact at the first end (5.2) of the sealing gasket (5), the second end (5.3) and more preferably the third annular lip (5.32) include at least one external recess (9.2). The external recess (9.2) defines a permanent channel for the continuous passage of fluid toward the second chamber (7.2), such that the fluid pressure exerts an additional force on the second annular lip (5.31) against the wall (6).

[0063] Furthermore, the aforementioned vertical arrangement between the chambers (7.1, 7.2) and the annular lip (5.21 and 5.31) allows the pressure exerted by the fluid on the sealing gasket (5) to generate a resultant force directed towards contact with the ball (3), thereby enhancing the tightness of the ball valve assembly.

[0064] In this way, an isolation seal is ensured in the direction of fluid flow from right to left. Therefore, under low temperature conditions, for this type of bidirectional ball valve, only one shut-off base (4) is needed in one of the ports of the pipe (2, 2'), instead of a gasket for each port as in the known embodiments, thus forming a cavity-less ball valve, i.e., the valve body (1) has no dead space for fluid accumulation and overpressure.

[0065] According to one design option, the receiving portion (7) can be located on the valve body (1), or as... Figure 2 and Figure 3 As shown, the shut-off base (4) can be included in the base insert (1.1) of the valve body (1), wherein the valve body (1) may consist of two parts, one for each port, but the shut-off base (4) as described at the contact point with the ball (3) is always present. This configuration allows for simplified manufacturing of the base, since the receiving portion (7) will be machined in the base insert (1.1) itself rather than directly on the valve body (1). Furthermore, it allows for replacement of the base in case of aging or failure.

[0066] like Figure 9 As can be seen, the inner recess (9.1) and the outer recess (9.2) are preferably located at an angularly dispersed position on the axial surface of the sealing gasket. This configuration distributes fluid pressure to ensure a better sealing barrier.

[0067] In addition, such as Figure 11 As can be seen, in alternative embodiments, such as Figure 10 The closing base shown is similar to that used in the prior art, intended to be included in the second opening, such that the closing base (4) of the present invention will be disposed in the left opening of the first tube (2), while Figure 10 The simple base will be placed in the right port of the second pipe (2'). Therefore, redundant sealing is provided in the valve in one direction. Normally, to achieve this redundant sealing in a device, two valves need to be installed in series; however, with this configuration, no additional valve is required.

[0068] Alternatively, the closing base (4) can be installed at both ports to improve installation safety. In this case, it is intended to include a mechanism for releasing pressure from the internal cavity of the valve body, since fluid may remain in the chamber (10) during valve opening and closing operations and pressure needs to be released if overpressure occurs.

Claims

1. A bidirectional ball valve with a cryogenic base, comprising: - Valve body (1), which has a first fluid inlet pipe (2) and a second fluid outlet pipe (2'). - A ball (3) having a through hole (3.1) disposed in the internal cavity of the valve body (1) between the first fluid inlet pipe (2) and the second fluid outlet pipe (2'), the ball (3) being rotatable between a position connecting the through hole (3.1) to the first fluid inlet pipe (2) and the second fluid outlet pipe (2') and a position where passage between the first fluid inlet pipe (2) and the second fluid outlet pipe (2') is interrupted. - A closing base (4), disposed in the first fluid inlet pipe (2) and / or the second fluid outlet pipe (2'), comprising a sealing gasket (5) inserted into a receiving portion (7) defined in the wall (6) of the internal cavity in which the sphere (3) is disposed, the sealing gasket (5) comprising: - The middle portion (5.1) protrudes from the receiving portion (7) and contacts the ball (3) to close the flow of fluid through the contact between the sealing gasket (5) and the ball (3); - A first end portion (5.2) defining a first chamber (7.1) of the receiving portion (7) between the wall (6) and the first end portion (5.2), wherein a first spring (8.1) of the closing base (4) is disposed in the first chamber, the first spring pressing a first annular lip (5.21) of the first end portion (5.2) of the sealing gasket (5) against the wall (6) to close fluid passage at the contact between the sealing gasket (5) and the wall (6), thereby establishing fluid passage from the first fluid inlet pipe (2) to the first chamber (7.1) only between the wall (6) and the sealing gasket (5) of the internal cavity of the valve body (1). The sealing gasket (5) is characterized in that it includes a second end (5.3) that defines a second chamber (7.2) of the receiving portion (7) between the wall (6) and the second end (5.3), and a second spring (8.2) of the closing base (4) is disposed in the second chamber. The second spring presses a second annular lip (5.31) of the second end (5.3) of the sealing gasket (5) against the wall (6) such that fluid passage is blocked at the contact between the sealing gasket (5) and the wall (6), and fluid passage from the second fluid outlet pipe (2') to the second chamber (7.2) is established only between the wall (6) of the inner cavity of the valve body (1) and the sealing gasket (5).

2. The bidirectional ball valve with a cryogenic base according to the preceding claim, characterized in that, The first annular lip (5.21) is arranged along the direction of the first fluid inlet pipe (2), and the second annular lip (5.31) is arranged at a certain angle relative to the first annular lip (5.21).

3. The bidirectional ball valve with a cryogenic base according to claim 1 or 2, characterized in that, The first end portion (5.2) includes at least one recess (9.1) transverse to the sealing gasket (5), which defines a permanent channel for fluid passage from the first fluid inlet pipe (2) to the first chamber (7.1) when the first end portion (5.2) contacts the wall of the receiving portion (7) in the area for fluid passage.

4. The bidirectional ball valve with a cryogenic base according to claim 1 or 2, characterized in that, The second end portion (5.3) includes at least one external recess (9.2) transverse to the sealing gasket (5), which defines a permanent channel for fluid passage from the second fluid outlet pipe (2') to the second chamber (7.2).

5. The bidirectional ball valve with a cryogenic base according to claim 1 or 2, characterized in that, The second end portion (5.3) includes a third annular lip (5.32) that contacts the wall (6) and, together with the second annular lip (5.31), defines a receiving portion for the second spring (8.2).

6. The bidirectional ball valve with a cryogenic base according to claim 1 or 2, characterized in that, It includes a plurality of inner recesses (9.1) and / or a plurality of outer recesses (9.2) angularly spaced from each other, the plurality of inner recesses being located in the first end portion (5.2) transverse to the sealing gasket (5), the plurality of inner recesses defining a permanent channel for fluid passage from the first fluid inlet pipe (2) to the first chamber (7.1) when the first end portion (5.2) contacts the wall of the receiving portion (7) in the area for fluid passage; the plurality of outer recesses being located in the second end portion (5.3) transverse to the sealing gasket (5), the plurality of outer recesses defining a permanent channel for fluid passage from the second fluid outlet pipe (2') to the second chamber (7.2).

7. The bidirectional ball valve with a cryogenic base according to claim 6, characterized in that, The inner recess (9.1) is positioned at an angularly dispersed position relative to the outer recess (9.2) in the axial direction with respect to the sealing gasket (5).

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