KR20060043705A - Tap for gas or liquid cylinder - Google Patents

Abstract

According to the present invention there is provided a tab for a gas or liquid cylinder comprising a reversing seat first valve located at the main part of the tab body and a second check valve located below the threaded bottom of the tab body proximal end and spring-pressed to the closed position. . Both valves are operated by an elongated stem extending from the tab body main part to the proximal end. When the tab is secured to the gas or liquid cylinder, the second check valve is located in the cylinder and thus remains in operation even when the tab body is cut at the point extending from the cylinder tap hole.

Description

TAP FOR GAS OR LIQUID CYLINDER}

1 is a longitudinal sectional view of a tab according to a first embodiment of the present invention.

2 is a longitudinal cross-sectional view of a tab according to another embodiment of the present invention.

<Brief description of the main parts of the drawing>

1: tap body

2: longitudinal bore

2a: Counterbore

5: conical thread

10: reversing seat first valve means

11: stem means

11-1: Upper stem

11-2: Lower part of extension

11-3: Lower stem extension part

12: annular seat surface

14: annular sealing ring means

15: lock ring

22: cup-shaped member

The present invention relates in particular to tabs for gas or liquid gas cylinders for vehicles such as trailers, and more particularly to an uncontrolled state of the cylinder contents when the tab body is cut out of the cylinder leaving a portion of the tab proximal end in the cylinder bore. To prevent the tap from leaking.

If the tab is attached to a gas or fluid cylinder, its proximal end is at least partially screwed into the tab hole of the gas or liquid cylinder. Thus, a portion of the tab body is received in the cylinder tab hole while the remaining portion of the tab body extends out of the cylinder from the cylinder tab hole. In the event of an accident, lateral or axial external forces may be exerted on a portion of the tab body extending from the cylinder tab hole, which forces the tab body to cut at a point reaching and extending approximately from the cylinder tab hole. It can be big enough to power on. If the tab is cut off, the main portion of the tab body provided in the first valve means for opening and closing the fluid flow passage through the tab is separated from the portion of the tab body that remains engaged within the cylinder tab hole. Thus, if the first valve means is damaged, the contents of the cylinder may leak out, which is particularly dangerous if the cylinder contains toxic, flammable, or explosive gases or fluids. In the prior art, it has been proposed to install an auxiliary check valve upstream of the tap of the first valve (i.e., between the first valve means and the cylinder interior) to be forced to the closed position by the pressure spring and the fluid pressure built into the cylinder. In the prior art, this known check valve means is arranged outside the cylinder or near the first valve means, so that there is a risk of cutting with the tab body portion containing the first valve means, or at least the cylinder bore is no longer empty. There is a risk of damage by external forces that cannot be closed without.

If the first valve actuation mechanism is broken, a check valve is also known which is closed only by the pressure of the cylinder and the compression spring is in the open position.

It is an object of the present invention for a gas or liquid cylinder to prevent the outflow of fluid contained in a cylinder when the tab body portion extending from the cylinder tab hole is cut or the first valve means is broken due to deformation of the tab body. To provide an improved tab.

According to the present invention, there is provided a tab body having a proximal end with a free end and an inner thread, an elongated stem means mounted to the tab body and having a longitudinal axis, and on one side of the proximal end opposite to the free end. A reversing seat first valve means provided in the tab body and a second check valve means for biasing the movable check valve element spring to the closed position to engage the check valve seat at the proximal end, wherein the stem means comprises the second check valve. Axially movable in a first direction towards the means such that fluid can flow from the inlet to the outlet through the tab body by opening the first valve means and opening the second valve means against a biasing spring force. And axially movable in an opposing second direction such that the second check valve means can be closed by the deflection spring. And close the first valve means for blocking fluid flow from the inlet to the outlet of the tab body, wherein the proximal end has a small diameter between the outer thread and the free end of the proximal end. And a sleeve tube having an open end at the small diameter portion, wherein the movable check valve element is in the sleeve tube, and a check valve seat is formed at the small diameter portion. to provide.

According to one advantageous embodiment, the valve valve seat is formed at the free end of the small diameter portion, and the check valve element comprises a piston element positioned below the small diameter portion and guiding the axial movement of the sleeve tube, preferably the check valve. The deflection spring is not located in the fluid flow path through the check valve means but in the spring chamber bypassing the fluid flow path through the check valve. This reduces turbulence and reduces spring stress and vibration in the gas flow through the check valve.

Accordingly, the second check valve is spaced a predetermined distance from the screw portion of the proximal end on one side of the proximal end opposing the tab body main portion in which the first valve means is incorporated. When the tab is coupled to the tab hole of the cylinder, the second check valve means is thus placed deep within the cylinder so that it remains in place even after the tab body is cut outside of the cylinder, and deformation due to external forces acting on the tab body main part Protection from damage, maintaining full operation even after deformation of the tab body.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, referring to FIG. 1, in which the tab of the present invention is shown in an upright state, the tab includes a tab body 1, a reversing seat first valve means 10, a second check valve means 24, It can be seen that it comprises a stem means 11 for actuating the valve means 10, 24 and a stem actuation means comprising a hand grip 9.

The tab body 1 has a longitudinal axis A which extends in the vertical direction in FIG. 1. The tab body 1 has an upper main body 4a and a lower proximal end 4b. The lower proximal end 4b is provided with a conical screw portion 5 tapered downward in the small diameter portion. The lower proximal end 4b has a cylindrical small diameter portion 20 extending downward from the lower end or the small diameter end of the conical threaded portion 5, and the upper main body 4a is the upper end of the opposing conical threaded portion 5 or It extends upward from the large diameter end. The outer diameter of the cylindrical small diameter portion 20 is smaller than the small diameter of the conical threaded portion 5. In some applications, the conical threaded portion 5 may be cylindrical. A longitudinal bore 2 concentric with the longitudinal axis A extends completely through the tab body 1 and extends from its upper end to its lower end. The longitudinal bore 2 has a counterbore 2a which extends downward from the upper end of the tab body and terminates at the shoulder portion 2c which faces upward in the axial direction within the main body 4a. Doing. The main body 4a also has an inner threaded portion 2e and an outer threaded portion 2d of the counterbore 2a adjacent to its upper open end at its upper end. The body main portion 4a has a connecting portion 6 extending laterally, which has an outer thread 7 thereon.

Between the upper end and the lower end of the main body part 4a, a reversing seat first valve means 10 is arranged, which is provided by the annular sealing ring retainer 14 of the counterbore 2a. And annular sealing ring means (13) held by the shoulder portion (2c) facing in the axial direction. The first valve means 10 further comprises an upwardly conical annular seat surface 12 in the stem means 11 which will be described in more detail herein below. The sealing ring means retinaner 14 is fastened in a suitable position by a locking ring 15 having an outer threaded portion 15a, which is in the inner threaded portion 2e of the counterbore 2a. Are combined in.

At the lower end of the tab, a second check valve means 24 is attached to the base end 4b. The check valve means 24 comprises a ball element 25 and a conical spiral winding spring 26, which springs the ball element 25 upwards and is provided in the lower end of the small diameter portion 20. It is fluid sealed with the seat surface 27. The check valve means 24 is underneath the small diameter portion 20 inside the cup-shaped member 22, the cup-shaped member 22 having an inner thread portion 23 engaged at its end with the outer threaded portion 21 of the small diameter portion 20. ). The cup-shaped member 22 is provided with the hole part 29 for the flow flow to the inside and an outside of the cup-shaped member 22 in the lower end.

The stem means 11 extends through the annular sealing ring 13, the sealing ring retainer 14, and the locking ring 15 and extends out of the tab body at its upper end 11-11. It includes 1). At its lower end, the upper part 11-1 of the stem means 11 has a radially expanding lower end 11-2, which is arranged under the annular sealing ring 13 and at its upper end. The conical upward annular seat surface 12 is provided. The stem means 11 has a second or lower extension 11-3, which extends from the upper end in the axial direction of the upper stem 11a extended lower end 11-2. It is accommodated in the bore 11-4 which is open downward and is fixed in it. The stem lower portion 11-3 extends downward from the extended lower portion 11-2 to the proximal end 4b, and the lower portion of the stem lower portion when the reversing seat first valve means 10 is closed, i.e. When the seat surface 12 on the stem means 11 is in fluid sealing engagement with the annular sealing ring 13, there is a predetermined distance upward from the check valve ball 24. The reversing seat first valve means 10 is opened when the stem means moves downward to move the annular seat surface 12 at a predetermined distance downward from the annular sealing ring 13. Immediately after the first valve means 10 is opened, the lower end of the stem lower portion 11-3 contacts the check valve ball element 25 to move the ball element from the annular seat surface 27. When the stem means 11 moves in the opposite direction, ie upwards, the second check valve means 24 is first closed by the pressing force of the spring 26 and the pressure of the fluid built into the cylinder, and then the first valve. The means 10 are also closed.

The stem means 11 are operated up and down along the longitudinal axis A by the handle 9. The handle is provided with an inner threaded portion 8 engaged with an outer threaded portion 2d of the upper end of the valve body 1. The handle 9 is mounted on the small diameter end 11-5 of the stem upper portion 11-1 and freely rotates around the stem means 11. The handle 9 is mounted to the stem means 11 such that the stem means 11 moves with the handle 9 in both axial directions when the handle 9 is rotated about the axis A, and the tab The upper end of the body 1 is engaged with the outer threaded portion 2d and the handle inner threaded portion 8 to move up and down relative to the tab body 1. The handle 9 is attached to the lower support ring 9a engaging with the shoulder portion facing upward in the upper portion of the upper portion of the stem 11-1 and the upper small diameter end 11-5 of the stem upper portion 11-1. It is held axially to the stem means 11 between the screwed nut members 9b. The friction reducing washers 9a ', 9b' are provided between the support ring 9a and the handle 9 and between the nut member 9b and the handle 9, respectively.

Two sealing rings 16A and 16B are provided between the stem upper portion 11-1 and the locking ring 15. Another sealing ring 16C is provided between the stem upper portion 11-1 and the annular sealing ring retainer 14. An additional sealing ring 16D is provided between the locking ring 15 and the inner wall of the counterbore 2a, and another additional sealing ring between the outer circumferential surface of the retainer 14 and the inner circumferential surface of the counterbore 2a. 16E is provided.

The longitudinal bore 2 is formed with a fluid flow passage 28, which extends around the lower extension 11-3 of the stem means 11 and the expansion of the stem upper portion 11-1. It extends from the tab body inlet I in the lower end part of the small diameter part 20 of the base end part 4b to the annular sealing ring 13 around the lower end part 11-2. An additional flow passage 3 is formed in the laterally extending connection 6, extending from the tab body outlet O to the counterbore 2a above the annular sealing ring 13 and retaining the sealing ring retainer 14. Retainer 14 formed by a small diameter portion formed in the upper portion 11-1 above the radially extending end 11-2 through an orifice 18 formed at a predetermined distance in the circumferential direction. It is in communication with an annular flow passage 19 formed therein.

Opening the first valve means 10 causes both flow passages 28, 3, 19 to be in fluid communication with each other, and opening the check valve means 24 also allows gas or liquid flow to flow through the inlet I. From the outlet O to the outlet O, or in the opposite direction to the cylinder injection method. The flow passages 28, 3, 19 are sealed to each other when the first valve means are closed. The check valve means 24 is then also closed and the gas or liquid flow through the tab is blocked.

Therefore, the check valve means 24 is located at the lowest end of the proximal end below the small diameter portion 20, and when the tab body 1 is cut at the shear surface shown in FIG. It can be seen that it remains fully operational at the bottom of 4b) and remains in the threaded tap hole of the cylinder. The second check valve means 24 is spaced a considerable distance downwardly from the front end face and will not be damaged or deformed if it is located in the cylinder and the tab body 1 is cut along the front end face. The second check valve means 24 is kept in full operation even when the tab body portion is not cut by external forces acting on the tab body outside the cylinder and is only deformed by that force. In addition, the small diameter portion 20 on which the second check valve means 24 is mounted does not directly contact the cylinder, so that a large tensile force that can be applied to the screw portion when the tab body main portion 4a is cut or laterally deformed Even when the threaded portion 5 is deformed, it will not be easily deformed. Since the small diameter portion 20 is not deformed, the second check valve means 24 remains sufficiently effective to close the cylinder hole portion closely.

Referring now to FIG. 2, another embodiment of a tab according to the invention in an upright position is shown. The tab of FIG. 2 will only describe the parts that are distinct from the tab of FIG. 1. First, in FIG. 2, the neck end of the cylinder C that is engaged with the tab body proximal end 50 is shown.

A modified second check valve 60 is attached to the end opening sleeve tube 62 fixedly attached to the lower small diameter portion 50a of the base end 50. This second check valve 60 comprises a movable check valve element which is arranged below the small diameter portion 50a and consists of a piston element 64 having a piston skirt portion whose outer diameter is smaller than the inner diameter of the sleeve tube 62. . The piston skirt portion or piston element 64 has a closed upper end 64-2 and an open lower end 64-1 that are forced against a seat surface provided at the lower end of the small diameter portion 50a. The piston element 64 is forced towards the seat surface by a helical cylindrical spring 67, which is a helical cylindrical spring 67 and an annular shoulder portion 69 and an piston element extending inwardly of the sleeve tube 62. It is arranged in the annular spring chamber surrounding the piston element 64 between the annular flange portions 68 extending outwardly of 64. The piston element 64 is guided to move in the axial direction of the sleeve tube 62 by the annular piston flange portion 68 in the annular shoulder portion 69 extending inwardly of the sleeve tube 62. It will be noted that the spring chamber does not form part of the fluid flow path through the check valve 60, in other words the fluid flow path through the check valve 60 bypasses the spring chamber. The piston element 64 has one or more preferably a plurality of orifices 68 between the closed top 64-2 and the annular flange 68, which orifices 66 are closed top 64-2. It is arranged inside the piston element in communication with the outside below. The sleeve tube 62 has a lower inner thread portion 62-1 for connecting the plunger tube (not shown), and an inner thread portion at the upper end portion for screwing with the outer thread portion of the small diameter portion 50a.

In another embodiment, the spring 67 may be in a piston skirt, which may have an axial fluid flow channel on its outer surface.

The embodiment of FIG. 2 is further distinguished from the embodiment of FIG. 1 in that the stem means 111 has a stem upper portion 111A formed integrally with the stem lower portion 111B. In addition, the annular sealing means 94 of the reversing sealing first valve means 54 is provided in the stem means 111, and the annular sealing surface 96 of the first valve means 54 is a stationary tubular seat member 76. This fixed tubular sheet member 76 surrounds the stem means 111 and is equivalent to a sealing ring retainer according to the embodiment of FIG. 1.

In order to prevent fluid leakage along the upper portion 111A of the stem means 111, a sealing structure 78 is provided in the annular sheet member 76. This sealing structure 78 is well known in the art and will not be described further herein. Additional sealing means 71, 72, 73 are provided around the annular sheet member 76 and to prevent leakage along the inner circumferential surface of the counterbore 52-1 at the body main part 52. .

Other stem actuation means are also provided, including a handle portion 84 with an axial pillar that is fixedly attached. The pillar portion 75 is axially aligned with the stem means and is connected to the stem means by a coupling means 74 so that the pillar portion 75 can move in rotation with respect to the axially movable stem means 111. do. The annular or tubular seat member 76 is held in an appropriate position by an annular locking ring 80 screwed to the upper end of the counterbore 52-1, and then screwed into the outer surface of the main body 52. It is hold | maintained by the tab cover part 82 which exists. The pillar portion 75 is provided with an outer thread portion engaged with the thread portion 82 on the inner surface of the annular locking ring 80. Rotating the handle in the opposite direction causes the handle to move up and down and transmit this movement to the stem to move the stem axially.

In another aspect, the embodiment of FIG. 2 shows that the base end 50 has no inner threaded portion for receiving the actuating device for opening the second check valve 60 when the tab body is cut at the shear surface shown in FIG. 2. Same as the embodiment of FIG. 1 except for the point.

Although two different embodiments of the present invention have been described in detail herein, it will be understood that various changes or modifications may be made within the scope and spirit of the invention. For example, other stem actuation means, such as hydraulic actuation means, pneumatic actuation means, or electric actuation means may be used. In addition, the small diameter part 20 of FIG. 1 or the small diameter part 50a of FIG. 2 can be manufactured longer, and a check valve can also be arrange | positioned in a small diameter part. The check valve seat surface 27 (FIG. 1) may be inserted in the opposite end rather than the free end of the small diameter part 20, 50a.

According to the present invention, for a gas or liquid cylinder that prevents the outflow of fluid contained in a cylinder when the tab body portion extending from the cylinder tap hole is cut or the first valve means is broken due to deformation of the tab body. Can provide improved tabs.

Claims (8)

A tab body having a free end and a proximal end provided with an inner thread part; Elongated stem means mounted to the tab body and having a longitudinal axis, A reversing seat first valve means provided in the tab body at one side of the proximal end opposite to the free end; Second check valve means wherein the actuated check valve element spring is urged into the closed position to engage the check valve seat at the proximal end Wherein the stem means is axially movable in a first direction towards the second check valve means, thereby opening the first valve means and opening the second valve means against a biasing spring force, Allowing fluid to flow from the inlet to the outlet through the tab body and being axially movable in an opposing second direction such that the second check valve means can be closed by the deflection spring, A tap for a gas or liquid cylinder, wherein said first valve means is closed to block fluid flow from an inlet to an outlet, The proximal end comprises a small diameter portion between the free end of the proximal end and the outer threaded portion, the sleeve tube having an open end at the small diameter portion is fixed, the movable check valve element is in the sleeve tube, and the small diameter portion has a check valve seat A tab for a gas or liquid cylinder, characterized in that it is formed. The gas or liquid cylinder tab of claim 1, wherein the check valve seat is formed at a free end of the small diameter portion. The tab of claim 1, wherein the check valve element comprises a piston element. 4. The gas or liquid cylinder tab of claim 3, wherein the check valve means comprises a deflection spring disposed in the spring chamber, the fluid flow path passing through the check valve means bypasses the spring chamber. 4. The piston element according to claim 3, wherein the piston element comprises a piston skirt portion, the outer diameter of the skirt portion being smaller than the inner diameter of the sleeve tube, the piston skirt portion being sleeved by the outer annular flange of the piston skirt portion at the inner annular shoulder portion of the sleeve tube. A guide valve deflection spring disposed around the piston skirt portion between the shoulder portion and the flange portion, guided to move in the axial direction of the tube, the piston skirt portion having a first closed end engaging the check valve seat and a sleeve And a hollow interior having a second open end in communication with the interior of the tube and at least one orifice penetrating the piston skirt between the closed end and the flange portion of the sleeve tube. The sleeve tube according to any one of claims 1 to 5, wherein the sleeve tube has a first end portion and a second end portion, and the first end portion has an inner thread portion for screwing with an outer thread portion of a small diameter portion proximal portion. Characterized by a tap for a gas or liquid cylinder. 7. The gas or liquid cylinder tab of claim 6, wherein the other end of the sleeve tube includes a thread for connecting the plunger tube to the sleeve tube. 8. A valve according to any one of the preceding claims, wherein in the closed position of the first valve means, the check valve actuating end of the stem means is opened first if the stem means moves in the first direction. And at a distance from the check valve element such that the check valve means closes first when the stem means moves in the second direction.

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