RU2716645C1 - Ball cryogenic valve - Google Patents

Abstract

FIELD: cryogenics.

SUBSTANCE: invention relates to cryogenic equipment, namely to ball cryogenic valves with remote or manual control for use in cryogenic temperature conditions, and is intended for control of cryogenic liquid flow, for example, flow of liquefied air separation product, LNG etc. Disclosed is a ball cryogenic valve comprising a housing, a shut-off assembly comprising a ball and a rod, a sealing assembly, a flange with a gasket and sealing rings, a drive. Housing is made in form of inner casing and outer casing concentrically spaced relative to each other, guide cone and sleeve threaded, located between casing inner and cone guide, flange installed on the side of the drive, and the bottom on the opposite side, which is tightly installed on the free end of the guide cone. All said housing parts form a vacuum cavity between outer casing and inner casing. Inner casing on side of vacuum cavity has screen-vacuum isolation. Inside the internal casing there is a cavity of the shut-off unit communicated with the pipeline of the working cavity. In the shutoff assembly cavity there is a rod enveloped with anti-convective heat insulation. Valve sealing assembly is made in form of a sealing sleeve in contact with the ball, on which the thrust bushing is supported, spring-loaded with a disc spring, interacting with the bushing, fixing its position, sealing by jamming of cone of disc spring guiding on its conical surface. On the ball surface the mounting holes are made for the assembly / disassembly device and liquid leak release opening. Lock sleeve are provided with mounting holes.

EFFECT: valve makes it possible to increase reliability of its operation with simultaneous possibility of its independent use in cryogenic communications, and also to ensure its repairability.

1 cl, 6 dwg

Description

The invention relates to cryogenic technology, namely, to cryogenic ball valves with vacuum thermal insulation with remote control, as well as with manual control for use in cryogenic temperatures, and is intended to control the flow of cryogenic liquid, for example, the flow of a liquefied product of air separation, LNG, etc.

Known ball valve according to patent RU No. 2551711 (MIIK: F16K, 5/06) comprising a housing with an inlet adapter, an outlet adapter, a ball valve with a splined hole and a groove, a shaft, a shaft seal and a lower support. A groove is made in the inlet adapter, into which a seal in the form of a cuff is installed. The seal interacts with the groove surface of the inlet adapter and the lip of the cuff with a ball valve.

Utility models CN are known No. 20560500, 203322354 (MGZH: F16K, 5/06) for ball cryogenic valves, which contain a housing, a seat, a shut-off element in the ball water, a spring and sealing seals.

A technical solution is known for a ball cryogenic valve according to patent FR No. 2512157 (F16K, 5/0668), in which there is a housing, a seat and a locking member made of plastic, as well as a sealing ring seal having two surfaces - spherical and conical.

Known ball cryogenic valve according to the application KR No. 100693935 (IPC: F16K, 5/04), comprising a housing, a Teflon seat, having an inclined section, a locking member in the form of a ball, and sealing seals.

A technical solution is known according to US patent No. 4258900 (IPC: F16K, 5/06), where an annular recess is formed in a housing made of sponge graphite adjacent to the ball, in which a saddle made of rigid material is located.

All of these analogues have a significant drawback - work in a cryogenic environment leads to frequent wear of valve components and, especially, seals, and these analogues are non-separable valves, i.e. not repairable.

The closest analogue to the proposed ball cryogenic valve is a ball cryogenic valve according to the patent for utility model CN No. 206001103 (IPC: F16K, 51/02), containing the inlet and outlet nozzles, a locking member in the form of a ball, a seat, a seal that provides sealing with on the inside, the locking organ is a ball, and on the outside, it interacts with the support along the plane, which at low temperatures leads to compression of the seal, in which the formation of leaks is possible.

In addition, the entire valve, as an autonomous unit, does not have its own vacuum thermal insulation.

Thus, the proposed solution does not have sufficient reliability at cryogenic temperatures.

Moreover, the entire valve is placed in a vacuum box, in which there are many other elements, which makes it impossible to use it in communication systems for cryogenic environments.

The objective of the proposed solution is to increase the reliability of the ball cryogenic valve with the simultaneous possibility of its autonomous use in cryogenic communications, as well as ensuring its dismountability and, as a consequence, maintainability.

This problem is solved in that in the proposed ball cryogenic valve comprising a housing, a shut-off assembly including a ball and a rod, a sealing assembly, a flange with a gasket and sealing rings, the actuator, the housing is made in the form of an inner casing and an outer casing concentrically arranged relative to each other , the cone of the guide and the threaded sleeve located between the inner casing and the cone of the guide, a flange mounted on the drive side and a bottom on the opposite side, are sealed on the free end of the guide cone, while all of the above body parts form a vacuum cavity between the outer casing and the inner casing, and the inner casing on the side of the vacuum cavity has a screen-vacuum insulation, inside the inner casing there is a cavity of the shut-off assembly in communication with the working cavity pipeline , in the cavity of the shutoff assembly a rod is located, covered by anti-convection thermal insulation, while the sealing valve assembly is made in the form of a sealing bush contacting the ball, on to The support is supported by a thrust spring loaded with a Belleville spring, which interacts with the sleeve and fixes its position, sealing by jamming the guide cone with the spring of the Belleville on its conical surface, mounting holes are made on the surface of the ball for the assembly / disassembly device and a hole for discharging liquid leaks, and in the sleeve mounting holes are also made.

In FIG. 1 valve is shown in the open position. In FIG. 2 shows a valve body. In FIG. 3 shows a locking assembly. In FIG. 4 is a View B. In FIG. 5 shows a section along aa. In FIG. 6 shows a section along BB.

In the figures:

1 - inner casing;

2 - outer casing;

3 - guide cone;

4 - threaded sleeve;

5 - flange;

6 - screen-vacuum insulation;

7 - pipeline working cavity;

8 - cavity of the shutoff assembly;

9 - a vacuum cavity;

10 - stock;

11 - ball;

12 - sealing sleeve;

13 - Belleville spring;

14 - thrust sleeve;

15 - fixing sleeve;

16 - anti-convection thermal insulation;

17 - holes mounting sleeve fixing;

18 - a flange;

19-drive;

20 - sealing gasket;

21 - sealing rings;

22 - hole mounting ball;

23 - hole for discharging liquid leaks;

24 - bottom.

In the proposed ball cryogenic valve, the housing is made in the form of an inner 1 casing and an outer 2 casing, a guide cone 3 and a threaded sleeve 4 located concentrically relative to each other, located between the inner casing 1 and the guide cone 3, flange 5 mounted on the side of the actuator 19 and the bottom 24 on the opposite side, hermetically mounted on the free end of the cone of the guide 3, while all of the above body parts form a vacuum cavity 9 between the outer casing 2 and the inner casing 1, p Why does the inner casing 1 from the side of the vacuum cavity 9 have a screen-vacuum insulation 6, inside the inner casing 1 there is a cavity of the shut-off assembly 8, connected with the pipeline of the working cavity 7, a rod 10 is located in the cavity of the shut-off assembly 8, covered by the anti-convection 16 insulation, while the assembly the sealing valve is made in the form of a sealing 12 in contact with the sleeve ball 11, on which the thrust sleeve 14 is supported, spring-loaded with a poppet spring 13, interacting with the sleeve fixing 15 its position, sealing ation of the guide cone 3 wedging force spring diaphragm 13 in its conical surface, on the surface of the ball 11 is provided with holes 22 for mounting a device for assembling / disassembling and leak fluid discharge hole 23, and fixing in the sleeve 15 are also formed mounting holes 17.

The valve operates as follows.

Ball 11, when rotated through 90 ° by actuator 19, closes or opens the valve using rod 10. In the open position, the body parts are cooled. In this case, the sealing sleeve 12, made of a thermoplastic material (fluoroplastic or a composite based on it) is compressed more than the mating parts — the guide cone 3 and the ball 11. The resulting gap is eliminated by moving the sleeve of the sealing 12 along the cone guide 3 of the body under the action of a Belleville spring 13 and thrust bushings 14. At the same time, the sealing sleeve 12 compresses the ball 11, also providing a seal. The preliminary sealing force is also created by a disk spring 13, a pre-compressed fixing sleeve 15. All cooled valve parts are enclosed in an insulated inner casing 1, which covers the screen-vacuum insulation 6, and the stem 10, in turn, covers the anti-convection insulation 16. The valve seal in the warm zone produced by sealing 20 and sealing rings 21. The hole for discharging liquid leaks 23 serves to discharge possible leaks of liquid into the pipeline of the working cavity 7 to Apana.

The valve assembly is performed in the following order. When assembling the valve, the retaining sleeve 15 compresses the Belleville spring 13, providing sealing of the sealing sleeve 12 with the cone guide 3 and the ball 11.

When disassembling, the valve parts are released after removing the actuator 19, flange 7 and rod 10. After that, an assembly / disassembly tool is inserted into the holes of the mounting sleeve of the fixing 17, the sleeve 17 is turned out and removed, then a removable device is screwed into the holes of the mounting ball 22, with which valve parts are being dismantled.

Placing all the functional parts of the valve in the inner vacuum casing 1 allows the valve to be used as an independent unit in communication lines.

Thus, the reliability of a spherical cryogenic valve at cryogenic temperatures is increased with the simultaneous possibility of its autonomous use in cryogenic communications, as well as its dismountability and, as a consequence, its maintainability are ensured.

Claims (1)

A ball cryogenic valve comprising a housing, a locking assembly comprising a ball and a stem, a sealing assembly, a flange with a sealing gasket and sealing rings, an actuator characterized in that the housing is made in the form of an inner casing and an outer casing, a guide cone and concentric relative to each other threaded bushings, located between the inner casing and the guide cone, a flange mounted on the drive side, and a bottom on the opposite side, sealed on the free end of the guide cone, while all of the above body parts form a vacuum cavity between the outer casing and the inner casing, and the inner casing on the side of the vacuum cavity has a screen-vacuum insulation, inside the inner casing there is a shut-off unit cavity, connected with the working cavity pipeline, in the shut-off unit cavity a rod is located, covered by anti-convection thermal insulation, while the sealing valve assembly is made in the form of a sealing sleeve in contact with the ball of the sleeve, on which the sleeve is supported it is spring-mounted, spring-loaded with a Belleville spring, interacting with the sleeve, fixing its position, sealing by jamming the cone of the guide with the spring force of the Belleville spring on its conical surface, mounting holes are made on the surface of the ball for the assembly / disassembly device and a hole for discharging liquid leaks, and in the sleeve fixing also mounting holes are made.

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