JPH10231982A - High pressure hose with metal fitting for liquefied petroleum gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a consolidated construction and allow easy return of a release preventive valve by introducing such a configuration that a metal fitting at one end of a high pressure hose is equipped with a mechanism to shut the gas passage through the action of the release preventive valve with an excessive flow of gas and that another metal fixture at the other end is equipped with a back flow preventive mechanism. SOLUTION: A metal fitting 23 on the vessel side mounted on one end of a high pressure hose 22 is composed of a body 24 of release preventor provided with a gas flowing hole 28 and guide hole, which are located on the same axis, and a return nipple 51 which is inserted in the guide hole and is sliceable in the axial direction, wherein the arrangement includes a valve seat 37 of a check valve receptacle metal piece 34 furnished at the flow-in port A of the gas flow hole 28 of the body 24 of release preventor and another valve seat 26 of a bulkhead part 25 in the partitioning position between the gas flow hole 128 and guide hole, and a release preventive valve 41 provided with a left and a right valve head to open and close the two valve seats is installed afloat in the gas flow hole leading from the valve seat 37 to the other 26. A guide hole 68 and an outlet hole 69 are formed as having valve seat in the partitioning position on the same axis of a gas flow hole 67 in the body of a metal fixture 65 as hose fitting on the manifold side attached to the other end of the high pressure hose, and the guide hole 68 and outlet hole 69 are equipped with a check valve which is energized resiliently toward the flow-out port and can open and close the valve seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied petroleum gas high-pressure hose for connecting a liquefied petroleum gas high-pressure container to a collecting pipe.

[0002]

2. Description of the Related Art Conventionally, as a form of connecting a high-pressure vessel of this kind of liquefied petroleum gas to a collecting pipe, for example, as shown in FIGS. A discharge prevention device 2 is mounted, one end of a high-pressure hose 3 is mounted on the outlet side of the gas release prevention device 2, and the other end of the high-pressure hose 3 is connected to a switching valve 4 mounted on a collecting line 12. I have. The gas release preventive device 2 is classified into an overflow type and a tension type. The gas release preventive device 2 is of the overcurrent type, and as shown in FIG. A preventer main body 5 having a gas flow hole 6 formed to flow from the inlet 6a to the outlet 6b, a main valve 7 provided in the gas flow hole 6 so as to be slidable in the axial direction and blocking the gas flow hole 6, A spring 8 loaded into the gas flow hole 6 to urge the main valve 7 toward the inflow port 6a;
The cylindrical sliding member 9 which receives the spring 8 on the b side and is slidable in the axial direction, and receives the end of the sliding member 9 on the outflow port 6b side in a direction orthogonal to the axial direction. The pressure adjusting member 10 includes a slidable pressure adjusting member 10 and a compression coil spring 11 which is orthogonal to the axis and resiliently projects from the outside of the protector main body 5 toward the gas flow hole 6.

In recent years, in particular, as a measure against earthquake and snow damage, for example, when the high-pressure hose 3 is damaged,
On the side, gas emission is blocked by the gas emission preventer 2, but when the switching valve 4 attached to the collecting pipe 12 is open, gas from the other high-pressure vessel 1 flows backward and leaks. It is obligatory to interpose a check valve (not shown) between the switching valve 4 and the collecting line 12 in order to prevent a secondary disaster.

[0004]

However, the conventional gas release preventing device 2, the high pressure hose 3, the switching valve 4 and the check valve are each independently developed and manufactured by different manufacturers. Has a complicated structure as described above, so the cost of a single unit is high.In addition, it is necessary to connect each device with screws when adopting them, so the number of connection screw parts increases and the connection is the same. There is a problem that the part is loosened, and there is a problem of usability such as gas leakage, and the piping cost is relatively high. The present invention has been made to solve the above technical problems,
A mechanism that automatically activates a release prevention valve to shut off a gas passage when a gas having a flow rate equal to or greater than a set flow rate flows into a fitting provided at one end of one high-pressure hose and connected to a container valve of a high-pressure container. A high-pressure hose with a liquefied petroleum gas coupling fitting that can easily integrate the backflow prevention mechanism into the fitting that connects to the collecting pipe at the other end and integrates the backflow prevention valve. It is intended to provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned technical problems, the present invention is directed to a high-pressure hose with a joint fitting for liquefied petroleum gas for connecting a high-pressure vessel and a collecting pipe, A container-side joint fitting attached to one end of the high-pressure hose is provided with a discharge preventer main body having a gas flow hole and a guide hole formed on the same axis, and is inserted into the guide hole of the discharge preventer main body, and is inserted in the axial direction. A return nipple that is slidable on the valve body, and is formed at a valve seat of a check valve receiving member provided on the inflow side of the gas flow hole of the discharge prevention device main body, and at a defined position between the gas flow hole and the guide hole. A release prevention valve having left and right valve heads for opening and closing the two valve seats is floatingly attached to the gas flow hole between the valve seat of the partition wall and the other end of the high-pressure hose. Coaxial with the gas flow hole of the fitting body of the collecting pipe side fitting fitting On the upper side, a guide hole and an outlet hole are formed with a valve seat at the defined position, and a check valve for opening and closing the valve seat is urged toward the outlet in the guide hole and the outlet hole. The invention of claim 2 is that
The return nipple of the container-side joint fitting is a valve that closes the valve seat by moving to the partition side along the axial direction when the discharge prevention valve closes the valve seat of the partition due to gas overflow. A high-pressure hose with a joint for liquefied petroleum gas, wherein the head is pushed to open the valve seat, and the gas is allowed to flow to return the release prevention valve to the floating position of the gas flow hole.

[0006]

According to the above construction, the high-pressure hose with the joint fitting for liquefied petroleum gas has a high-pressure hose for connecting the high-pressure container to the collecting pipe, and a non-return valve having a function for preventing gas overflow from the high-pressure container. Since the container-side joint fitting constituting the preventive device and the collecting-tube-side joint fitting having the function of preventing gas backflow from the collecting pipe are set, a conventional gas release preventing device, a high-pressure hose, a check valve, etc. Can be manufactured at a lower cost than when individually manufactured.In addition, the integrated structure reduces the number of connection threads and eliminates problems caused by loosening of the connection threads, thus reducing piping costs. Can be reduced. Further, when replacing the pressure vessel, a gas of a predetermined pressure remains between the discharge prevention valve and the check valve, so that the vessel can be easily replaced. Further, when the release prevention valve closes the valve seat of the partition due to gas overflow, the valve seat is opened by moving the return nipple to the partition along the axial direction, and the gas flows. The release prevention valve can be easily returned to the original floating state.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a partially broken view of a high-pressure hose with a joint fitting for liquefied petroleum gas (hereinafter, referred to as a high-pressure hose with a joint fitting). FIG. 2 is a cross-sectional view of the container-side connection fitting.
2 is connected to the container valve fitting 23 connected to the container valve of the high-pressure container 1 and connected to the switching valve 4 mounted to the other end and connected to the collecting pipe 12 side. It comprises a pipe-side fitting fitting 65.

As shown in FIG. 2, the container-side connection fitting 23 comprises a discharge prevention device main body 24, a discharge prevention valve 41 provided inside the main body 24, and a return nipple 51. In the axial direction of the main body 24, a valve seat 26 and a communication hole 27 are formed with a predetermined diameter at a substantially central portion of the main body 24 to form a partition wall 25.
A gas flow hole 28 having a predetermined diameter is formed on the side, and a small-diameter hole 29a and a large-diameter hole 29b are provided on the downstream side of the partition wall 25.
A stepped guide hole 29 for slidably guiding the return nipple 51 is formed. At a predetermined position on the outer peripheral portion on the downstream side of the main body 24, a concave groove 30 for mounting the return ring 62 is formed. At a predetermined position of the large-diameter hole portion 29b of the guide hole 29, a groove portion 31 into which a U-ring 32 for restricting sliding of the return nipple 51 is fitted and fixed is formed. In addition, the inlet A of the gas flow hole 28
On the side, a female screw portion 33 is screwed and a check valve receiving bracket 34 is attached.

The check valve receiving member 34 has a substantially warhead shape, and a screw portion 35 screwed with the female screw portion 33 is provided on an outer peripheral portion thereof.
A gas passage 36 having a predetermined diameter penetrates the center of the metal fitting 34, and a partition wall 25 is formed at an inner end of the gas passage 36.
A valve seat 37 is formed opposite to the valve seat 26. An O-ring 38 is fitted and fixed to the outer periphery of the warhead. A release prevention valve 41 is elastically mounted between the check valve receiving fitting 34 and the partition wall 25 thus attached.

The release prevention valve 41 has a substantially rectangular block-shaped valve main body 42, and a substantially warhead-shaped valve head 43 formed on one end face of the valve main body 42 on the side of the check valve receiving member 34. The discharge prevention valve 41 is provided at a predetermined position of the valve head 43.
When O moves to the check valve receiving bracket 34 side, an O-ring 44 that abuts on and closes the valve seat 37 of the receiving bracket 34 is fitted and fixed. A substantially warhead-shaped valve head 45 is formed on the end face of the valve body 42 on the partition wall 25 side.
When the release prevention valve 41 moves to the partition wall 25 side, an O-ring 46 that comes into contact with and closes the valve seat 26 of the partition wall 25 is fitted and fixed at a predetermined position. A bifurcated convex portion 47 is formed on the tip end side of the valve seat 26 so as to project a predetermined length toward the guide hole 29 with the O-ring 46 in contact with the valve seat 26.

The discharge preventing valve 41 thus formed has a predetermined spring pressure P1 between the end face of the valve body 42 having the valve head 45 and the partition wall 25 in the gas flow hole 28. An operation spring 48 is interposed, and a discharge check valve spring 49 having a predetermined spring pressure P2 is interposed between the end face of the valve body 42 forming the valve head 43 and the check valve receiving member 34. Thus, the release prevention valve 41 is held in a floating state by elasticity,
The convex portion 47 of the valve head 45 is separated from the partition 25. The spring pressure P1 and the spring pressure P2 have a relationship of P1> P2. A return nipple 51 is slidably mounted on the guide hole 29 side of the emission preventer main body 24 thus formed.

The return nipple 51 is connected to the discharge preventer main body 2.
The slide shaft portion 52 inserted through the small-diameter hole portion 29a of the guide hole 29 and the regulating shaft portion 5 inserted through the large-diameter hole portion 29b.
3 are formed in a stepped shape, and a gas flow hole 54 having a predetermined diameter is formed at the center thereof along the axis. Also,
On the outer periphery of the slide shaft portion 52, for example, two ring grooves are recessed at a predetermined interval, and an O-ring 55 is fitted therein.
At the end of the slide shaft 52, a projection 52a is formed so as to be inserted into the insertion hole 27 of the partition 25. In addition, a regulating recess 56 having a predetermined width h in the axial direction is formed in the outer peripheral portion of the regulating shaft 53 in relation to the U-ring 32 attached to the large-diameter hole 29 b of the guide hole 29. The outer periphery of the regulating shaft portion 53 at a predetermined position has a substantially L-shaped cross section and
A nut portion 57 having a swallowing portion 58 capable of swallowing the end 24a of the fourth member 4 is formed. Also, the nut portion 57
, A latching flange 59 of the sleeve 60 is formed. Reference numeral 61 denotes a union nut formed with a left-hand threaded portion 61a slidably fitted to the main body 24.

The U-ring 32 is fitted into the regulating recess 56 of the regulating shaft 53 of the return nipple 51 thus formed, and is inserted into the guide hole 29 while being elastically contracted. At the position of the groove 31 recessed in the hole 29b, it is elastically expanded and slidably fitted and locked.
In this state, the return nipple 51 is provided so as to be movable in the axial direction within the width h of the restriction recess 56, and the return ring 62 is elastically attached to the concave groove 30 of the main body 24. The nipple 51 is brought into contact with the main body 24.
Fixed to In this fixed state, the convex portion 52a of the slide shaft portion 52 and the partition wall portion 25 have an interval h1 (an interval at which the convex portion 47 does not abut when the release prevention valve 41 closes the valve seat 26). One end of the high-pressure hose 22 is crimped to the container-side fitting 23 thus formed via a sleeve 60, and a collecting pipe-side fitting 65 is attached to the other end of the high-pressure hose 22.

The joint fitting 65 on the collecting pipe side comprises a fitting main body 66 and a check valve 75 as shown in FIG. A gas flow passage 67 having a predetermined diameter is formed through the metal fitting body 66 in the axial direction thereof.
A guide hole 68 that allows the check valve 75 to slide and an outlet hole 69 having a diameter larger than the guide hole 68 are formed in a predetermined range on the side of the guide hole 68. The valve seat 70 of the check valve 75 is formed. In addition, exit hole 6
9 is provided with a groove 71 for mounting a retaining ring 82 for retaining the check valve 75, and a screw portion 72, a nut portion 73, and a sleeve 60 are formed on the outer peripheral portion of the metal fitting body 66. A latch flange 74 is formed.

The check valve 75 comprises a shaft portion 76 slidably fitted in the guide hole 68 of the metal fitting body 66 and a valve head 79, and the shaft portion 76 extends in the axial direction from the shaft end. Gas passage 7 having substantially the same diameter as gas flow passage 67 up to the position of valve head 79
At the end of the gas passage 77, a passage 78 penetrating at right angles to the outer periphery is formed. Also, the valve head 7
At a predetermined position 9, an O-ring 80 for closing the valve seat 70 is attached. The check valve 75 thus formed has its shaft portion 76 inserted through the guide hole 68 and a predetermined spring pressure between the shaft portion 76 and the end of the guide hole 68 (the container-side joint fitting 23). A check valve spring 81 having substantially the same spring pressure as the discharge check valve spring 49) is interposed and the check valve 7
5 is urged toward the outlet B side and is prevented from falling off by a retaining ring 82. In this state, the valve seat 70 is open.

The collecting pipe side fitting 6 thus formed
5 is crimped to the other end of the high-pressure hose 22 via a sleeve 60 to form a high-pressure hose 21 with fittings, which is configured with a release prevention valve 41 and a check valve. The container-side fitting 23 of the high-pressure hose 21 with the fitting thus formed is connected to the container valve of the high-pressure container 1 via the union nut 61, and the collecting pipe-side fitting 6
Reference numeral 5 is connected to the switching valve 4 attached to the collecting pipe 12.

Next, the operation of the high-pressure hose 21 with the joint fitting configured as described above will be described with reference to FIGS. 1 to 6A and 6B.
It is explained according to. High pressure hose 21 with this fitting
In the normal state, as shown in FIG. 1, that is, on the container side fitting 23 side, as shown in FIG. 2, the discharge prevention valve 41 is elastically held by the overflow operation spring 48 and the discharge prevention valve spring 49 so as to float, and The valve seat 37 and the partition 2 of the stop valve fitting 34
The valve seat 26 of No. 5 is open, and the check valve 75 of the fitting fitting 65 on the collecting pipe side is urged by the check valve spring 81 toward the retaining ring 82 to open the valve seat 70.

The container side fitting 23 of the high pressure hose 21 with the fitting is connected to a container valve, and the collecting pipe side fitting 65 is connected to the container valve.
Is connected to the switching valve 4 of the collecting pipe 12 to supply gas. For example, when the collecting pipe 12 is newly provided, the switching valve is opened and the container valve is gradually opened to thereby newly install the container. Since the inside of the collecting pipe 12 is substantially at atmospheric pressure, the gas can be supplied to the gas equipment side while the release prevention valve 41 of the container side fitting 23 maintains the floating state of FIG.

When the container valve is suddenly opened, an overflow state is exhibited. As shown in FIG. 3, the discharge prevention valve 41 elastically compresses the overflow operation spring 48 by gas pressure and causes the valve head 4 to compress.
By closing the valve seat 26 of the partition 25 by the 5 side, the supply of gas to the gas equipment side is shut off, and the discharge check valve spring is elastically extended. When the overflow is closed, a return operation is performed to return the release prevention valve 41 to the state shown in FIG.

When the release prevention valve 41 is returned, the return nipple 51 is slidable in the axial direction by first removing the return ring 62 from the groove 30 as shown in FIG. The release prevention valve 41 allows the partition 25
When the valve seat 26 is closed by the valve head 45, a convex portion 47 formed on the valve head 45 protrudes toward the guide hole 29 by a predetermined dimension. In this state, when the return nipple 51 is moved toward the partition wall 25 along the axis, the protrusion 52a at the tip of the slide shaft 52 of the return nipple 51 comes into contact with the protrusion 47 of the valve head 45. By moving in the direction, the release prevention valve 41 is moved toward the inflow port A while elastically compressing the release prevention valve spring 49, the overflow operation spring 48 is elastically restored, and the valve seat 26 is opened.

The return nipple 51 maintains a regulated state in which the regulating recess 56 is in contact with the U-ring 32, as shown in FIG. 5, so that the gas flows through the gas flow passage 54 of the nipple 51, the high-pressure hose 22, The gas is supplied to the collecting pipe 12 via the collecting pipe side fitting metal fitting 65, so that the pipe from the valve head 45 of the release prevention valve 41 to a predetermined gas pressure. In this state, the return nipple 51 is returned to the original position along the axis, and the return ring 62 is fitted into the concave groove 30, whereby the return nipple 51 is fixed. In this state, when the gas is supplied from the container side, the release prevention valve 41 is set in the main body 24 as shown in FIG.
And the return operation is completed.

Next, the case of replacing the high-pressure vessel 1 will be described. In this case, the remaining amount of gas in the high-pressure vessel 1 is reduced, and the other high-pressure vessels 1 are open. In this state, when the container valve of the high-pressure container 1 on the replacement side is closed and the union nut 61 is loosened to remove the container-side fitting tube 23 of the high-pressure hose 21 with the fitting, the high-pressure hose 21 with the same fitting is removed. The gas pressure on the collecting pipe line 12 acts on the check valve 75 of the collecting fitting 65 on the collecting pipe side, and as shown in FIG. 6 (b), the check valve 75 moves the check valve spring 81 along the axis. The gas is elastically compressed and moves to the inlet A side, and the valve seat 70 is closed by the valve head 79 to prevent the gas from flowing back from the collecting pipe 12. At the same time, the gas pressure in the high-pressure hose 21 with the joint fitting acts on the container-side joint fitting 23 side so that the overflow operating spring 48 is elastically extended, and the release prevention valve 41 is moved along the axis as shown in FIG. The release prevention valve spring 49 is elastically compressed and moved to the inlet A side, and the valve head 43 closes the valve seat 37 of the check valve receiving bracket 34. In this state, gas remains in the high-pressure hose 21 with fittings.

The container-side joint fitting 23 of the high-pressure hose 21 with the joint fitting removed from the old high-pressure vessel 1 is connected to the container valve of the new high-pressure vessel 1 via the union nut 61,
When the container valve is gradually opened, since the gas remains in the high-pressure hose 21 with the joint fitting, the release prevention valve 41 does not close the valve seat 26 of the partition wall 25,
The overpressure actuating spring 48 is gradually elastically compressed by the gas pressure of the new high-pressure container 1 (at the same time, the discharge check valve spring 49 is elastically restored), moves to the outlet B side along the axis, and the valve seat 37 is opened. Then, the gas flows in, and due to the inflow of the gas, the check valve 75 of the joint fitting 65 at the collecting pipe moves to the outlet B side along the axis to open the valve seat 70 and is supplied to the collecting pipe. .

As described above, the high-pressure hose 21 with the joint fitting according to the present embodiment is configured to operate as described above, so that the high-pressure container 1 falls over when a disaster such as a large-scale earthquake, wind, snow and flood damage occurs. , Collecting pipeline 1 due to building damage, etc.
In the case where the valve 2 is damaged, the gas flows over from the high-pressure vessel 1 side, so that the release prevention valve 41 moves to the outlet B side along the axis as shown in FIG. The valve seat 26 of the part 25 is closed and the high pressure vessel 1 is connected to the collecting pipe 12.
It is possible to prevent gas from leaking to the side at a set flow rate or more.

When the high-pressure hose 22 of the high-pressure hose 21 with the joint fitting is damaged due to the falling of the high-pressure vessel 1 or the damage of the building, etc., the container-side joint fitting 23 is not As shown in FIG. 3, the release prevention valve 41 moves to the outlet B side along the axis, and the valve seat 2 of the partition wall 25 is moved.
6, the check valve 75 is moved in the axial direction by the reverse flow of gas from the collecting pipe 12 on the collecting pipe side fitting fitting 65 side, and the valve seat 70 is closed to close the collecting pipe. Gas outflow from the road 12 is prevented. As described above, according to the high-pressure hose 21 with the fitting, it is possible to prevent a secondary disaster caused by gas at the time of a disaster such as an earthquake, wind, snow and flood.

As described above, in the high-pressure hose 21 with the joint fitting of the present embodiment, the container-side joint fitting 23 attached to one end of the high-pressure hose 22 connects the high-pressure container 1 and the collecting pipe 12 with the same shaft. Gas flow hole 28 and guide hole 2
9 and a return nipple which is inserted into the guide hole 29 of the discharge preventer main body 24 and is slidable in the axial direction.
4, a valve seat 37 of a check valve receiving member 34 provided on the inlet A side of the gas flow hole 28, the gas flow hole 28 and the guide hole 2
In the gas flow hole 28 between the partition 9 and the valve seat 26 of the partition wall formed at the partition position, the release prevention valve 41 having left and right valve heads 43 and 45 for opening and closing the two valve seats 26 and 37 floats. A guide hole 68 and an outlet hole 69 are located on the same axis of the gas flow hole 67 of the fitting main body 66 of the collecting pipe side fitting fitting attached to the other end of the high-pressure hose 22. In the guide hole 68 and the outlet hole 69, a check valve 75 including a shaft portion 76 and a valve head 79 which can open and close the valve seat 70 is formed in the outlet B. It is configured to be urged and landed toward.

Therefore, the high-pressure hose 2 with the joint fitting
In FIG. 1, a high-pressure hose 22 connecting the high-pressure vessel 1 and the collecting pipe 12, a container-side fitting 23 constituting a backflow prevention device having a function of preventing gas overflow from the high-pressure vessel 1, Since the collecting pipe side fitting fitting 65 having the gas backflow prevention function is configured as a set, it is produced at a lower cost than when the conventional gas release prevention device 2, high pressure hose 3, and backflow prevention valve are individually manufactured. Can also
With the integral structure, the number of connection screw portions is reduced, and the problem caused by loosening of the connection screw portions is eliminated, so that piping cost can be reduced. Further, when the pressure vessel 1 is replaced, the gas remains between the discharge prevention valve 41 and the check valve 75, so that the vessel 1 can be easily replaced. In addition, when the discharge prevention valve 41 is operated due to the gas overflow and the valve seat 26 of the partition wall 25 is closed, the valve seat 26 is moved by moving the return nipple 51 to the partition wall 25 side along the axial direction. The release prevention valve 41 can be easily opened and returned to the original floating state by flowing the gas.

In the above-described embodiment, the groove 30 is formed at a predetermined position on the outer periphery of the main body 24, and the return ring 62 is fitted into the groove 30 so that the return nipple 5 is formed.
1 is fixed, but the present invention is not limited to this. For example, the release preventer body 24 and the return nipple 51 may be fixed.
May be locked / unlocked by an insertion pin or the like. Further, a projection 47 is formed on the valve head 45 of the release prevention valve 41, and the projection 47 is provided so as to project toward the guide hole 29 when the valve seat 26 of the partition 25 is closed.
Although the return nipple 51 is pushed in the axial direction and pushed back by the convex portion 52a of the slide shaft portion 52 to return the release prevention valve 41, the present invention is not limited to this.
For example, the convex portion 47 of the valve head 45 may be omitted, and the convex portion 52a of the slide shaft portion 52 may be formed longer by that amount.

[Brief description of the drawings]

FIG. 1 is a partially broken view of a high-pressure hose with a fitting for liquefied petroleum gas.

FIG. 2 is a sectional view of a normal state in which a release prevention valve of a container side fitting is held in a floating state.

FIG. 3 is a cross-sectional view showing a state in which a discharge prevention valve of a container-side joint fitting closes a valve seat of a partition wall due to gas overflow.

FIG. 4 is a cross-sectional view of the container-side joint fitting in a state in which gas in a high-pressure hose acts to close a valve seat of a check valve receiving fitting when a high-pressure container is replaced.

FIG. 5 is an operation explanatory view of returning the release prevention valve from the state of FIG. 3;

FIG. 6 (a) is a cross-sectional view of a normal state in which a check valve of a fitting fitting for a collecting pipe is urged. FIG. 4B is a cross-sectional view of the fitting fitting on the collecting pipe side when the high-pressure container is replaced or the high-pressure hose is broken, and the check valve receives a gas reverse flow from the collecting pipe to close the valve seat.

FIG. 7 is a schematic explanatory view for connecting a plurality of high-pressure vessels and a collecting pipe in the related art.

FIG. 8 is an explanatory diagram of a conventional gas release preventing device, a high-pressure hose, and a switching valve that connect a high-pressure container and a collecting pipe.

FIG. 9 is a sectional view of a conventional gas emission preventing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 High-pressure hose with liquefied petroleum gas joint fitting 22 High-pressure hose 23 Container side fitting 24 Discharge prevention valve main body 25 Partition wall 26 Valve seat 28 Gas circulation hole 29 Guide hole 34 Check valve receiving bracket 37 Valve seat 41 Release prevention valve 43 , 45 Valve head 47 Convex part 51 Return nipple 65 Collecting pipe side fitting metal fitting 66 Metal fitting body 67 Gas flow hole 68 Guide hole 69 Outlet hole 70 Valve seat 75 Check valve 76 Shaft part 79 Shaft head A Inlet B Outlet

Claims (2)

[Claims] 1. A high-pressure hose with a joint for liquefied petroleum gas for connecting a high-pressure container and a collecting pipe, wherein a container-side joint attached to one end of the high-pressure hose has a gas flow hole and a guide on the same axis. An emission preventer main body having a hole formed therein, and a return nipple inserted in the guide hole of the emission preventer main body and slidable in the axial direction. A left and right opening and closing the two valve seats is provided in a gas flow hole between a valve seat of a check valve receiving bracket provided on the side and a valve seat of a partition formed at a partition position between the gas flow hole and the guide hole. The release prevention valve forming the valve head is elastically floated, and a guide hole is provided on the same axis as the gas flow hole of the fitting body of the collecting pipe side fitting fitting attached to the other end of the high-pressure hose. An outlet hole is formed with a valve seat in the compartment, A high-pressure hose with a fitting for liquefied petroleum gas, characterized in that a check valve for opening and closing a valve seat is biased and elastically directed toward an outflow port in the id hole and the outlet hole. 2. The return nipple of the container-side joint fitting,
When the release prevention valve closes the valve seat of the partition by gas overflow, by moving toward the partition along the axial direction, the valve head that has closed the valve seat is pushed out, and the valve seat is closed. Open up,
2. The high pressure hose with a liquefied petroleum gas joint fitting according to claim 1, wherein the gas is allowed to flow to return the release prevention valve to the floating position of the gas flow hole.