JPH029155Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutoff valve locking device for a high pressure gas container valve.

A high-pressure gas container valve equipped with a shutoff valve that was previously developed by the inventor of the present application (Utility Application No. 172339/1989, same)
172341), a locking member that prevents the operation of a shutoff valve when a high-pressure gas container is inverted for residual gas extraction is installed in a mounting hole that passes through the valve body so that it can move back and forth in an airtight manner. Since the valve is operated from the outside, its structure is complicated and it is inconvenient to handle, and since the valve body has a through hole, it is less safe than when there is no through hole, which is inconvenient. It is.

The object of the present invention is to provide a locking device for a shutoff valve that can prevent the operation of the shutoff valve without providing a through hole in the valve body.

The shutoff valve locking device for the high-pressure gas container valve of the present invention consists of (A) an enlarged diameter step on the upstream side of the main valve seat provided at the upper end edge of the inlet channel that communicates with the discharge channel of the valve body attached to the high-pressure gas container; A valve for a high-pressure gas container, which has a shutoff valve built in the inflow passage that forms a subvalve seat consisting of a subvalve seat and automatically closes the subvalve seat in the event of a disaster, wherein (B) the valve stem of the shutoff valve is A ball guide member that allows gas flow is provided, (C) a lock ball is irremovably stored in a ball storage space formed vertically between the ball guide member and the inflow path, and (D)
The lock ball locks the shutoff valve so that it cannot be operated when the high pressure gas container is inverted.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIGS. 1 to 5, reference numeral 1 denotes a valve body, which is attached to a high-pressure gas container (not shown) through a threaded portion 2. 3 is the release path; 4
is the inflow path. 5 is the main valve seat, and the discharge path 3
It is formed at the upper end edge of the inlet passage 4 which communicates with the inflow passage 4.
The main valve seat 5 is opened and closed by a main valve 7 which is raised and lowered by operating a handle 6. A sub-valve seat 8 is formed at the bottom of the main valve seat 5, that is, on the upstream side, and is formed by an enlarged diameter step. 9 is a safety valve.

Reference numerals 10 and 110 are mushroom-shaped shutoff valves that close the sub-valve seat 8, and include an O-ring 11 and a protrusion 1 for eliminating pressure difference.
2. The upper end of the differential pressure eliminating projection 12 projects above the main valve seat 5 when the sub valve seat 8 is open. Valve stem 1 of shutoff valve 10, 110
3, 113 is attached with a cylindrical ball guide member 30 that allows gas flow. 1 to 3, the spring member 14 supporting the cylindrical ball guide member 30 is supported by a support nut 15 screwed onto the lower end of the inflow channel 4. As shown in FIGS. The shutoff valve 10 is connected to the spring member 14 via the cylindrical ball guide member 30.
It is supported so that it can levitate. When the cutoff valve 10 floats up due to the excess gas and comes into contact with the sub-valve seat 8, the sub-valve seat 8 is closed due to the pressure difference (see FIG. 2). In Figures 4 and 5,
The valve stem 113 of the shutoff valve 110 extends below the cylindrical ball guide member 30, and a disk attached to its lower end connects to the support nut 11 screwed onto the lower end of the inflow channel 4.
It is in contact with a weight 114 that is swingably supported on the shaft 5. The shutoff valve 110 is pushed up by the swinging of the weight 114 and contacts the sub-valve seat 8, and at the same time closes the sub-valve seat 8 due to the pressure difference (fifth
(see figure). Instead of the illustrated cutoff valves 10, 110,
A shutoff valve that has these functions (the above-mentioned
57-172341) may be used.

As shown in FIGS. 1 to 6, a plurality of grooves 31 are formed in the circumferential surface of the cylindrical ball guide member 30 in the vertical direction. The number of grooves 31 may be one. 20 is an enlarged diameter portion formed in the inflow path 4. The concave groove 31 of the cylindrical ball guide member 30 and the inner surface of the enlarged diameter portion 20 of the inflow path 4 form a ball storage space 40 that allows the ball to move in the vertical direction. A lock ball 50 is housed in the ball storage cavity 40 and is supported by the upper end surfaces of the support nuts 15 and 115 facing the lower end of the ball storage cavity 40. A gap a formed between the cylindrical rising portion 32 formed at the upper end of the cylindrical ball guide member 30 and the inner surface of the inflow passage 4 that is continuous with the stepped portion 21 of the enlarged diameter portion 20 is smaller than the diameter of the lock ball 50. It has been formed. As a result, the lock ball 50 is housed in the ball storage space 40 without being able to escape. When the valve body 1 is turned upside down with the main valve seat 5 closed by the main valve 7 and the cutoff valves 10 and 110 opened via the differential pressure elimination protrusion 12, the lock ball 5
0 moves within the ball storage space 40 and expands into the enlarged diameter portion 20.
It reaches the gap a through the stepped portion 21 of the ball guide member 30 (see FIG. 3).

Instead of the cylindrical ball guide member 30, a linear ball guide member 130 (see FIG. 7), a Y-shaped ball guide member 230 (see FIG. 8), or a cross-shaped ball guide member (not shown) may be used. Good too. The straight-shaped ball guide member 130 and the Y-shaped ball guide member 230 are provided with arc-shaped rising portions 132 and 232, respectively, which correspond to the cylindrical rising portion 32. Although FIGS. 6 to 8 show grooves 31 provided in the ball guide members 30, 130, 230, FIG. As shown, a concave groove 331 is provided in the enlarged diameter portion 20 of the inflow passage 4, and a cylindrical ball guide member 330 without a concave groove 31 is provided.
may also be used. In addition, there is a space 40 for storing balls.
Instead of supporting the lock ball 50 housed in the lock ball 50 on the upper end surface of the support nuts 15, 115 screwed into the lower end of the inflow passage 4, a
The groove 331 in the figure may be transformed into a pocket 431, and the lock ball 50 may be housed in the pocket 431.

The high-pressure gas container valve equipped with the shutoff valve locking device of the present invention is constructed by attaching the threaded portion 2 of the valve body 1 to a high-pressure gas container (not shown), filling the container with high-pressure gas, and then inserting the discharge path 3 into the high-pressure gas container (not shown). It is used by connecting gas equipment, etc. When the main valve 7 is opened by operating the handle 6, the gas passes through the support nuts 15, 115, the cylindrical ball guide member 30, the inlet passage 4, the sub-valve seat 8, the main valve seat 5, and the discharge passage 3 to the gas appliance. released. Normally, a normal amount of gas flows through the inlet passage 4 and the cutoff valves 10 and 110 do not float, so the cutoff valve 10 is supported by the spring member 14 via the cylindrical ball guide member 30. The shutoff valve 110 is the valve stem 1
It is supported by a weight 114 via a disk provided at the lower end of the weight 114 . If an accident occurs in the piping system of gas equipment due to an earthquake, disaster, etc. during gas release, and the amount of gas flowing into the inlet channel 4 suddenly increases, resulting in so-called overflow gas, the overflow gas Therefore, the shutoff valve 10 floats up and contacts the sub-valve seat 8 as shown in FIG. 2, and at the same time closes the sub-valve seat 8 due to the pressure difference between the atmospheric pressure and the high pressure gas pressure inside the container. , gas release is instantly and automatically shut off. If the high-pressure gas container valve is tilted during gas release due to an earthquake, disaster, etc., as shown in FIG. contact, and thereafter gas release is blocked in the same manner as above. To return the cutoff valves 10, 110 to their original states after gas release is cut off, operate the handle 6 to lower the main valve 7. The shutoff valves 10, 110 are pushed down through the main valve seat 5, and the pressure difference is eliminated at the same time as the main valve seat 5 is closed, and the shutoff valves 10, 110 return to their original states.

When extracting residual gas in a high-pressure gas container using a vacuum pump, the main valve seat 5 is closed by the main valve 7 by operating the handle 6, and at the same time the cutoff valves 10, 11
If you invert the high pressure gas container after opening 0,
The lock ball 50 moves within the ball storage cavity 40 until it reaches the gap a (see FIG. 3) and locks the cylindrical ball guide member 30. Next, even if the discharge path 3 is connected to the vacuum pump and the handle 6 is operated to open the main valve seat 5, the shutoff valve 1 is closed because the cylindrical ball guide member 30 is locked by the lock ball.
Since the operation of the valves 0 and 110 is prevented and the sub-valve seat 8 is not blocked, the main valve 7 can be fully opened and the residual gas can be quickly extracted. Instead of the cylindrical ball guide member 30, a linear ball guide member shown in FIG. 7, a Y-shaped ball guide member 230 shown in FIG. 8, and a cylindrical ball without grooves shown in FIGS. 9 and 10 can be used. The guide member 330 also functions in the same manner as described above.

As can be easily understood from the above explanation,
According to the present invention, when the gas container is inverted to extract residual gas, the lock ball stored in the ball storage space formed in the valve body prevents the operation of the shutoff valve. It is easy to handle, and the structure is simple because no externally operated locking member is used. Furthermore, since no through hole for attaching the locking member is provided in the valve body, it is possible to achieve a practical effect of not reducing safety.

[Brief explanation of the drawing]

1 to 3 show an embodiment in which a shut-off valve lock device is applied to a high-pressure gas container valve equipped with a shut-off valve operated by excess gas.
The figure is a partially cutaway sectional view showing the state when normal flow rate is used, Figure 2 is a partially cutaway sectional view showing the overflow shutoff state, and Figure 3 is a partially cutaway sectional view showing the shutoff valve locked state when inverted. It is. 4 and 5 show another embodiment in which a shut-off valve locking device is applied to a high-pressure gas container valve equipped with a shut-off valve operated by the swinging of a weight. FIG. 5 is a partially cutaway sectional view showing a state when a normal flow rate is used, and FIG. 5 is a partially cutaway sectional view showing a cutoff state. FIG. 6 is a plan view of the locking device shown across the valve body in the embodiments of FIGS. 1 and 4, and FIGS. 7, 8, and 9 are shown in the same way as FIG. 6. FIG. 10 is a plan view of a modification of the locking device, and FIG. 10 is a sectional view of a modification of the locking device. 1: Valve body, 3: Discharge path, 4: Inflow path, 5: Main valve seat, 8: Sub-valve seat, 10, 110: Shutoff valve, 1
3,113: Valve trunk, 30,130,230,33
0: ball guide member, 40: ball storage space,
50: Rock ball.

Claims (1)

[Scope of Claim for Utility Model Registration] A sub-valve seat consisting of an enlarged diameter stepped portion is formed on the upstream side of a main valve seat provided at the upper end edge of an inflow passage communicating with a discharge passage of a valve body attached to a high-pressure gas container, A valve for a high-pressure gas container in which a shutoff valve that automatically closes the auxiliary valve seat in the event of a disaster is built into the inflow passage, the valve stem of the shutoff valve being provided with a ball guide member that allows gas to flow; A lock ball is irremovably stored in a ball storage space formed vertically between the ball guide member and the inflow path, and the lock ball locks the shutoff valve inoperable when the high pressure gas container is overturned. A shutoff valve lock device for a high pressure gas container valve, characterized in that: