JPH05215299A - Valve for gas cylinder - Google Patents

Abstract

PURPOSE:To provide a gas cylinder valve which allows gas filling operation to be efficiently carried out, and also can be made compact. CONSTITUTION:A gas inlet port 6 opened at the lower face 5a of the leg section of a valve box 4, is communicated with a gas outlet port 8 through a gas inlet path 11, a stop valve seat 12 and a stop valve chamber 13 in order. The operation of a handle wheel 19 permits a stop valve body 16 inserted into the stop valve chamber 13 to open/close the stop valve seat 12. A gas receiving port 10 opened to the outer circumferential surface of the valve box 4 is communicated with the gas inlet path 11 by a gas receiving path 22. The gas receiving path 22 is provided with a check valve seat 27 and a check valve chamber 28 in order starting from the gas receiving port 10. A check valve body 30 inserted in the check valve chamber 28 is elastically pressed onto a check valve seat 27 by a check spring 31 so as to be closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder valve fixed to a gas cylinder for storing compressed gas or liquefied gas.

[0002]

2. Description of the Related Art Generally, a cylinder valve of this type has a gas inlet hole opened on a lower surface of a leg portion of a valve box and connected to a gas outlet hole through a gas inlet passage, a stop valve seat and a stop valve chamber in this order. ,
The stop valve body inserted in the stop valve chamber is configured to be opened and closed by a handle wheel to a stop valve seat.

[0003]

In the above cylinder valve, the operation of filling the empty gas cylinder with gas is performed in the following procedure. First, rotate the steering wheel to the loosening side to open the stop valve body. Then, a gas filling metal fitting is screwed into the gas outlet hole to fill the gas. After the gas filling is completed, the handle wheel is rotated to the tightening side and the stop valve body is closed. Subsequently, the gas filling fitting is removed from the gas outlet hole.

In the above cylinder valve, when filling the gas,
Since it is necessary to rotate the handlebar wheel twice on the loosening side and the tightening side, the rotating operation is troublesome and the gas filling work is inefficient.

In order to solve the above problems, the inventors of the present invention have taken advantage of the proposal by the applicant of the present application.
The idea of using the technique described in Japanese Patent Publication No. 1 was first considered. The technology is that a gas receiving nozzle is projected laterally from the mid-height part of the valve box, and the gas receiving hole opened in the gas receiving nozzle is made to communicate with the inside of the gas cylinder through the gas receiving passage. The commercially available quick joint plug with double-sided check valve is screwed and fixed to the male screw portion at the tip of, and the socket of the quick joint is fixed to the tip portion of the gas filling high-pressure hose. When the high pressure hose side socket is connected to the valve side plug at the time of gas filling, the two check valve bodies incorporated in the socket and the plug are butted against each other to open the valve.

However, the following problems are newly caused in this conventional technique. Since the plug further projects from the gas outlet nozzle in the lateral direction and the entire valve becomes large, the cylinder valve cannot be covered with the existing protective cap.

Further, since the quick coupling has a structure in which the two check valve bodies are opened by connecting the socket to the plug, the socket is separated from the plug after the gas filling of the cylinder is completed. When this is done, the separation operation is performed while the pressure of the filling gas in the cylinder is still acting. For this reason, a large force is required for the separating operation of the quick joint, which makes the operation very difficult and reduces the efficiency of the gas filling operation.

An object of the present invention is to provide a cylinder valve which can be efficiently charged with gas and can be made compact.

[0009]

In order to achieve the above object, the present invention has a cylinder valve configured as follows. For example, as shown in FIGS. 1 and 2, or each of FIGS. 10 to 17, or FIGS. 18 to 20, the gas inlet hole 6 opened on the lower surface 5 a of the leg portion of the valve box 4 is connected to the gas inlet passage 11 And stop valve seat 12
And the stop valve chamber 13 in order to communicate with the gas outlet hole 8,
The stop valve body 16 inserted in the stop valve chamber 13 is configured to be opened and closed to the stop valve seat 12 by the opening and closing operation means 20, and is defined as the gas outlet hole 8 in the outer peripheral surface of the valve box 4. A gas receiving hole 10 is formed in a different outer peripheral surface, and a gas receiving passage 22 for communicating the gas receiving hole 10 with the leg lower surface 5a is provided in the valve box 4.
The check valve seat 27 and the check valve chamber 28 are connected to the gas receiving hole 1
The check valve body 30 is provided in order from 0, the check valve body 30 is inserted into the check valve chamber 28, and the check valve body 30 is provided with the check spring 31 for elastically closing the check valve seat 27.

[0010]

The cylinder valve 3 operates as follows, as shown in FIG. 1, for example. In the empty state of the gas cylinder 1, the stop valve body 16 is brought into close contact with the stop valve seat 12 by the opening / closing operation means 20. During the gas filling operation, the filling gas is supplied from the gas filling fitting 34 to the gas receiving hole 10. Then, the pressure of the filling gas causes the check valve body 30 to separate from the check valve seat 27 against the check spring 31, so that the filling gas flows from the check spring chamber 29 to the gas inlet passage 11 and the gas inlet hole 6. After that, it is filled into the gas cylinder 1.

When the pressure in the gas cylinder 1 and the gas inlet passage 11 reaches a predetermined filling pressure due to the above-mentioned gas filling, the check valve body 30 reverses due to the gas pressure and the elastic force of the check spring 31. Abut on the stop valve seat 27. After that, the gas supply to the gas filling fitting 34 is stopped, and the cylinder valve 3
The gas filling metal fitting 34 is removed from the container to complete the gas filling work.

As described above, since it is not necessary to operate the opening / closing operation means 20 of the cylinder valve 3 during the gas filling work, the gas filling work can be performed efficiently. Further, when the gas filling into the cylinder 1 is completed, the check valve body 30 is automatically closed to prevent the backflow from the cylinder 1 into the gas receiving hole 10, so that the gas filling metal fitting 34 is depressurized. In this state, it can be removed from the valve 3. Therefore, the filling metal fitting 34 can be removed with a light force, and the gas filling work becomes easier.

Moreover, the check valve chamber 28 and the check valve body 3 described above are provided.
Since 0 is provided in the valve box 4, the projecting length of the gas receiving nozzle 9 can be short. Thereby, the cylinder valve 3 can be made compact and can be covered with the existing protective cap.

In the cylinder valve 3 having the above structure, when the gas receiving passage 22 is communicated with the middle portion of the gas inlet passage 11 in an intersecting manner, the lower surface 5a of the leg portion of the valve box 4 has a gas inlet hole. Since it is only necessary to form one 6, it is possible to omit the labor of drilling holes. Further, the check valve chamber 2 is provided at the above intersection.
In the case of forming 8, the projecting length of the gas receiving nozzle 9 can be further shortened, so that the cylinder valve 3 can be made more compact.

[0015]

The present invention has the following effects because it is constructed and operates as described above. During the gas filling operation, the filling gas is supplied to the gas cylinder from the gas receiving hole through the check valve chamber, the gas inlet passage, and the gas inlet hole in order, so that it is not necessary to open / close the stop valve body by the opening / closing operation means. The filling work can be performed efficiently. Further, at the end of the gas filling, the check valve body is automatically closed to release the pressure and then the gas filling fitting can be removed. Therefore, the filling metal fitting can be removed with a light force, and the gas filling work becomes easier. Moreover, since the check valve chamber and the check valve body are provided in the gas receiving passage in the valve box, the projection length of the gas receiving nozzle is short and the cylinder valve can be made compact. Therefore, it is possible to cover the cylinder valve with the existing protection cap.

[0016]

【Example】

(First Embodiment) FIGS. 1 to 6 show a first embodiment.
First, the structure of the cylinder valve will be described with reference to FIGS. 1 and 2.
1 is a longitudinal sectional view, and FIG. 2 is a view taken along the line II-II of FIG.

A leg portion 5 of a valve box 4 of a cylinder valve 3 is screwed and fixed to a neck portion 2 of a gas cylinder 1. A gas inlet hole 6 is opened downward on the lower surface 5a of the leg portion 5, and a gas outlet hole 8 is opened on a gas outlet nozzle 7 protruding leftward from an upper portion of the valve box 4. In addition, a gas receiving hole 10 is formed in a gas receiving nozzle 9 which is provided rightward from an intermediate height portion of the valve box 4.
Is opened.

The gas cylinder 1 and the cylinder valve 3 are constructed so that they can store a compressed gas having a maximum working pressure of about 300 kgf / cm ² . Further, the cylinder valve 3 can be protected when the gas cylinder 1 falls over or collides with another object by screwing and fixing a protective cap (not shown) from the upper side to the male screw 2a provided on the cylinder neck 2. It has become.

The gas inlet hole 6 has a gas inlet passage 11, a stop valve seat 12 of the stop valve 15, a stop valve chamber 13 and a gas outlet passage 1.
It is connected to the gas outlet hole 8 through 4 in order. Stop valve chamber 1
The stop valve body 16 inserted in 3 is opened / closed by the stop valve seat 12 by the opening / closing operation means 20 including the valve rod 18 inserted in the valve lid 17 and the handle wheel 19.

The gas receiving hole 10 is communicated with the gas inlet hole 6 through a gas receiving passage 22 which is orthogonal to the middle portion of the gas inlet passage 11. The check valve 2 is connected to the gas receiving passage 22.
3 is attached. That is, the check valve seat 27 and the check valve chamber 28 are provided in the cassette cylinder 25 that is fixed to the gas receiving passage 22 in a hermetically sealed manner.
And are sequentially provided linearly with respect to the gas receiving hole 10. The check valve chamber 28 is formed at the intersection of the gas inlet passage 11 and the gas receiving passage 22. The check valve body 30 mounted in the check valve chamber 28 is elastically closed by the check spring 31 against the check valve seat 27. Above gas receiving hole 1
The gas receiving nozzle 9 which is the peripheral wall of
4 is provided with a support portion A that supports the supported portion B at the front end (the left end in FIG. 1) of FIG. The valve opening tool 35 of the gas filling fitting 34 is configured to face the check valve body 30 through the gas receiving hole 10. By incorporating the check valve 23 in the cassette cylinder 25 as described above, maintenance is facilitated.

The cylinder valve 3 operates as follows. When the gas is stored in the gas cylinder 1, the stop valve body 16 is brought into close contact with the stop valve seat 12 by the handle wheel 19. Further, the check valve body 30 is brought into close contact with the check valve seat 27 by the gas pressure in the gas inlet passage 11 and the elastic force of the check spring 31, so that the gas in the gas inlet passage 11 is closed. It is prevented from leaking to 10. When the gas is taken out from the gas cylinder 1, the stop valve body 16 is separated from the stop valve seat 12 by the handle wheel 19. Then, as shown by the two-dot chain line arrow in FIG. 1, the gas in the gas cylinder 1 passes through the gas inlet hole 6, the gas inlet passage 11, the stop valve chamber 13, and the gas outlet passage 14 in this order from the gas outlet hole 8. Taken out.

Next, the gas filling fitting 34 will be described with reference to FIGS. FIG. 3 is a vertical cross-sectional view showing a state in which the gas filling fitting 34 is fixed to the cylinder valve 3. Figure 4
Shows another cross-sectional view of the gas filling metal fitting 34, and FIG. 5 is a view taken along the line VV of FIG.

A gas filling passage 39 extending in the left-right direction is formed at the center of the casing 38. The gas filling path 39
Has one end connected to the gas filling hole 41 of the casing peripheral surface 40, and the other end of the gas filling passage 39 is opened to the left end surface of the casing. In the engagement operation cylinder hole 43 provided in the left portion of the gas filling passage 39, a cylindrical first piston 44, which is an engagement operation piston, is provided in the left-right direction via the O-ring first sealing member 45. It is inserted so that it can be sealed and moved freely. First above
A first drive chamber 46 is formed on the right outer side of the piston 44, and a forward spring 47 for elastically pressing the first piston 44 leftward is attached to the first drive chamber 46 to stop the forward movement of the first piston 44. It is blocked by a wheel 48.

A second sealing member 50 made of an O-ring is fitted on the left end surface of the first piston 44, and its second
The sealing member 50 is configured to be brought into sealing contact with the sealing outer end surface 25a of the cassette cylinder 25 of the cylinder valve 3. Further, as shown in FIG. 4, the first sealing member 4
The outer diameter dimension D for sealing 5 is set to a value larger than the outer diameter dimension d for sealing of the second sealing member 50.

The left portion of the rod-shaped valve opening device 35 is movably inserted in the left-right direction into the cylindrical hole 44a of the first piston 44, and the right portion of the valve opening device 35 is pressed by the holding bolt 52.
The O-ring 53 and the O-ring 53 support the casing 38 so that the casing 38 can move in the left-right direction in a tightly sealed manner. The above-mentioned valve opening tool 35
Is operated in the left-right direction by a pneumatic operation means 55 fixed to the right part of the casing 38. The operating means 55 is formed by inserting a second piston 57 into a cylinder barrel 56 fixed to the right part of the casing 38. A second drive chamber 58 is formed on the right side of the second piston 57, and a return spring 59 is attached on the left side of the second piston 57. The right end portion of the valve opening tool 35 is fixed to the second piston 57 with a screw.

A supported portion B supported by the supporting portion A of the cylinder valve 3 is provided on the left side of the peripheral wall of the cylinder hole 43. As shown in FIGS. 2 and 3, the supporting portion A is formed at the tip of the gas receiving nozzle 9,
4 projecting outward in the radial direction with a predetermined gap in the circumferential direction
It comprises one locking wall 68 and an insertion groove 67 formed between these adjacent locking walls 68. These insertion grooves 6
7 and a circumferential groove 69 is formed on the left side of the locking wall 68 over the entire circumference.

The above-mentioned supported portion B projects to the left 4
One L-shaped convex portion 61 and four concave portions 62 that recede rightward are provided alternately in the circumferential direction. The L-shaped convex portion 61 is formed by connecting a locked wall 63 that projects inward in the radial direction and a turning permission groove 64 that retracts outward in the radial direction in the left-right direction.

A cylindrical operating tool 71 for engaging and locking is externally fitted to the casing peripheral surface 40 through the two guide pins 72 and the guide groove 73 so as to be slidable in the left-right direction.
Two locks 77 are projected from the left side of the operation cylinder 71 to a position where they are fitted in the casing recess 62. The locking tool 77 is elastically pressed leftward from the casing 38 by the locking spring 78. The casing recessed portion 62 is provided with a retreat groove 79 that allows the lock 77 to move to the right.

The above gas filling fitting 34 is used for the gas cylinder 1
It is used as follows during the gas filling work. Prior to gas filling, the gas filling fitting 34 is connected to the gas receiving nozzle 9 of the gas cylinder 1. That is, as shown in FIG. 3, when the locked wall 63 of the casing 38 is inserted into the insertion groove 67 of the gas receiving nozzle 9 and is projected into the circumferential groove 69, as shown in the chain double-dashed line diagram of FIG. The operation tool 71 and the lock tool 77 are retracted to the right by the locking wall 68.

Then, when the casing 38 is swung by about 45 degrees, the locked wall 63 is received from the right side by the locking wall 68, and the locking tool 77 is inserted into the insertion groove 67.
Face to face. At the same time, the lock 77 is pushed into the insertion groove 67 by the elastic force of the lock spring 78.
As a result, the turning of the casing 38 is locked, and the gas filling fitting 34 can be prevented from falling off the nozzle 9.

Next, the operation of filling the gas cylinder 1 with gas will be described with reference to FIG. First, compressed air is supplied to the second drive chamber 58 of the operating means 55. Then, the valve opening tool 35 is driven leftward via the second piston 57, and the valve opening tool 35 resists the residual pressure in the gas cylinder 1 and the elastic force of the check spring 31 to prevent the check valve body 30. Is separated from the check valve seat 27. Then, the residual gas in the cylinder 1 is discharged from the gas filling hole 41 through the gas inlet passage 11 and the gas receiving passage 22 of the cylinder valve 3 and the gas filling passage 39 of the gas filling fitting 34. Subsequently, vacuuming work is performed from the gas filling hole 41 of the gas filling fitting 34. Then, the impure gas remaining in the gas cylinder 1 is discharged through the same route as above.

After that, the gas filling hole 4 of the gas filling fitting 34
Fresh gas is supplied from 1 to the gas filling passage 39. Then, the first piston is generated by the difference between the pressure receiving force corresponding to the sealing outer diameter dimension D of the first sealing member 45 and the pressure receiving pressure corresponding to the sealing outer diameter dimension d of the second sealing member 50. 44 is pressed leftward, and its first piston 44 seals and abuts the sealing outer end surface 25a of the cassette tube 25 via the second sealing member 50. Then, the fresh gas flowing into the gas filling passage 39 is filled into the gas cylinder 1 from the check valve chamber 28 through the gas inlet passage 11.

When the above gas filling is completed, the second drive chamber 5
Exhaust compressed air from 8. Then, the return spring 59 causes the valve opening tool 35 to retract, and the check valve body 30 is closed by the check spring 31. In this state, the gas in the gas filling passage 39 is allowed to escape from the filling hole 41, and the gas filling fitting 34 is removed from the gas cylinder 1. The above removing operation is performed as follows. First, as shown by the chain double-dashed line diagram in FIG. 4, the operation portion 81 of the operation tool 71 is pressed rightward to insert the insertion groove 6
Remove the lock 77 from 7. In this state, the casing 38 is swung by about 45 degrees, and the locked wall 63 is inserted into the insertion groove 6
Pull out to the right through 7.

The gas filling fitting 34 having the above-described structure has the following advantages. When connecting the gas filling metal fitting 34 to the cylinder valve 3 in a hermetically sealed manner, the sealing outer end surface 2 of the gas receiving nozzle 9 is connected.
Since it suffices to bring the tip end surface of the first piston 44 into contact with 5a in the axial direction, the sealing member 50 is less likely to be damaged during the connecting operation as compared with the case of the peripheral surface fitting type seal structure.
In addition, before the fresh gas is filled, the elastic force of the forward spring 47 causes the second sealing member 5 to pass through the first piston 44.
0 is pressed against the outer end surface 25a of the cylinder valve 3 and the elastic force of the forward spring 47 causes the first piston 4 to move.
Since the mounting posture of the casing 38 can be held straight through the position 4, the initial seal at the time of gas filling is good.

A gas filling system using the cylinder valve 3 and the gas filling fitting 34 will be described with reference to FIG. The gas header 83 installed in the gas filling station is provided with about 20 header valves 84, and each header valve 84 is connected to the high pressure hose 85.
And the gas filling metal fitting 34 in this order, and is connectable to the cylinder valve 3 of the gas cylinder 1. At the left end of the gas header 83, a blow valve 86, a vacuum valve 87, and a filling valve 88 are connected. These four types of main valves 84, 86, 87 and 88 are normally closed pneumatically operated valves. In the initial state, all the operation solenoid valves 89, 90, 91, 92, 93 are switched to the discharge position, so that all the above-mentioned main valves are closed. Further, the header main valve 84 is configured so that it cannot be opened and operated when the cylinder valve 3 is not connected. The operation air line M is provided with a filter 95, a pressure reducing valve 96, 96, and a lubricator 97, 97 in order.

The operation of filling the cylinder 1 that has been collected with the gas remaining with high-purity fresh gas is performed in the order of the step of blowing the residual gas, the step of evacuating the inside of the cylinder, and the step of filling the gas.

The above gas blowing step is performed according to the following procedure. First, the header solenoid valve 89 is switched to the supply position to open the header valve 84, and the blow solenoid valve 90 is opened.
Is switched to the supply position to open the blow valve 86. Next, the metal fitting solenoid valve 91 is switched to the supply position. Then,
The valve opening tool 35 driven by the pneumatic operation means 55 forcibly opens the check valve 23 against the residual pressure in the cylinder 1. As a result, the residual gas in the cylinder 1 is discharged to the blow line U through the gas filling fitting 34, the header valve 84, and the blowing valve 86 in this order.

Subsequently, the vacuuming process is performed in the following procedure. The blow solenoid valve 90 is switched to the discharge position to close the blow master valve 86, and the vacuum evacuation solenoid valve 92 is switched to the supply position to open the vacuum master valve 87.
Then, a vacuum pump provided at the end of the vacuum line V
Impure gas remaining in the cylinder 1 is sucked by (not shown).

Next, the gas filling process is performed in the following procedure. The vacuum evacuation solenoid valve 92 is switched to the discharge position to close the vacuum evacuation source valve 87, and the filling solenoid valve 9 is closed.
3 is switched to the supply position, and the filling main valve 88 is opened. Then, the fresh gas in the high-pressure tank (not shown) connected to the starting end of the filling line W passes through the filling main valve 88, the gas header 83, the header main valve 84, and the gas filling metal fitting 34 in this order to the cylinder 1. It will be filled. When the filling is completed, the metal fitting solenoid valve 91 is switched to the discharge position to open the valve opening tool 3
Retract 5 Then, the check valve 23 of the cylinder valve 3
Automatically closes. The metal fitting solenoid valve 91 may be switched to the discharge position from the start of the gas filling process and the valve opening tool 35 of the gas filling fitting 34 may be retracted. In this case, the check valve 23 is automatically opened by the pressure of the fresh gas to be charged.

Finally, the filling valve 88 is closed and the blowing valve 86 is opened to depressurize the gas filling fitting 34 to the gas header 83. Then, the gas filling metal fitting 34 is removed from the cylinder valve 3.

Note that each of the above-mentioned main valves may be constituted by an electromagnetic valve or a motor-operated valve instead of the pneumatically operated type. Further, in each of the above steps, it is preferable to provide an interlock circuit in the pneumatic circuit or the electric circuit in order to prevent a mistake in the opening / closing operation of each main valve. In the gas filling system having the above structure, as shown in FIG. 7, when the gas cylinder 201 equipped with the well-known standard cylinder valve 203 is collected, the standard valve 203 and the gas filling metal fitting 34 are separated from each other. The adapter 98 may be connected to.

FIG. 8 shows a system used for additionally filling the cylinder 1 with fresh gas, and the vacuuming line V and the metal fitting solenoid valve 91 in FIG. 6 are omitted. In this system, first, the collected cylinder 1
Is additionally filled with fresh gas from the filling line W. Then, the main valve for filling 88 is closed and the main valve for blowing 8 is closed.
6 is opened to depressurize the gas filling fitting 34 to the gas header 83, and then the gas filling fitting 34 is removed from the cylinder valve 3.

If the filling gas is harmless, it is possible to omit the blow line U, the blow source valve 86, and the blow electromagnetic valve 90. In this case, after the gas filling is completed, the header valve 84 is closed, the connection screw portion of the high pressure hose 85 and the like is loosened to release the pressure, and then the gas filling metal fitting 34 is removed from the cylinder valve 3. In addition, in the above-described system with only additional filling, the gas filling fitting 34 is
As shown in FIG. 3, the operating means 55 and the valve opening tool 3 shown in FIG.
5 may be omitted.

Each of FIGS. 10 to 17 and FIGS. 18 to 20 shows another embodiment of the cylinder valve, and the valve of FIG. 1 is modified as follows. In addition, in these other embodiments, members having the same configurations as those of the first embodiment are designated by the same reference numerals.

(Second Embodiment) FIG. 10 shows a second embodiment, in which the gas receiving hole 10 and the gas receiving passage 22 are connected to each other through the gas inlet passage 1
It is formed obliquely upward with respect to 1. This makes it possible to shorten the protruding length of the gas receiving nozzle 9 in the valve radial direction.

(Third Embodiment) FIG. 11 shows a third embodiment in which the stop valve body 16, the valve rod 18 and the handle wheel 19 are provided sideways and the gas outlet hole 8 is also provided sideways. 10 and the gas receiving path 22 are provided upward. Thereby, the gas filling metal fittings can be connected along the central axis of the gas cylinder and the cylinder valve 3, and the connection operation can be easily automated.

(Fourth Embodiment) FIG. 12 shows a fourth embodiment, in which a stop valve body 16, a valve rod 18 and a handle wheel 19 are provided sideways and a gas receiving hole 10 and a gas receiving passage 22 are provided.
Is provided laterally and the gas outlet hole 8 is provided upward.

(Fifth Embodiment) FIG. 13 shows a fifth embodiment, in which the gas receiving passage 22 is bent at a right angle and opened on the lower surface 5a of the leg portion of the valve box 4.

(Sixth Embodiment) FIG. 14 shows a sixth embodiment and shows a valve suitable for the system of FIG. Similar to FIG. 13 described above, the gas receiving passage 22 is bent and opened to the lower surface 5 a of the leg portion of the valve box 4. A check valve chamber 28 and a check valve seat 27 are provided near the opening of the gas receiving passage 22.
And are provided. A spring receiver 99 is screwed to the open end of the check valve body 30 by a check spring 31.
Closing pressure on 7. According to this configuration, the rod inserted from the gas receiving hole 10 into the gas receiving passage 22 is provided with the check valve body 3
Since it does not come into contact with 0, the check valve body 30 can be prevented from being forcibly opened by mistake. By omitting the cassette cylinder 25 in FIG. 1, the number of parts is reduced and complicated processing is not required, so that the manufacturing cost of the cylinder valve is reduced.

(Seventh Embodiment) FIG. 15 shows a seventh embodiment, in which a gas receiving passage 22 penetrates the gas inlet passage 11 at a right angle. Similar to the valve of FIG. 14 described above, the cassette cylinder 25 in FIG. 1 is omitted, and the check valve body 30, the check spring 31, and the spring receiver 99 are sequentially inserted from the left opening end side of the gas receiving passage 22. There is. Reference numeral 8 is a gas outlet hole. Check valve chamber 2
8 is formed at the intersection of the gas inlet passage 11 and the gas receiving passage 22. In the above-mentioned cylinder valve, the check valve 23 may be constructed in a cassette type as in the case of FIG.

(Eighth Embodiment) FIG. 16 shows an eighth embodiment, in which the support portion A of the cylinder valve 3 is constituted by a male screw. Further, the sealing cylinder 42 is screwed and fixed to the tip of the casing 38 of the gas filling fitting 34, and the supported portion B is constituted by the female screw of the cap nut 74 supported by the sealing cylinder 42.

(Ninth Embodiment) FIG. 17 shows a ninth embodiment, in which the support portion A of the cylinder valve 3 is formed by the female screw of the gas receiving hole 10. Further, the pressing metal fitting 76 is fixed to the tip of the casing 38 of the gas filling metal fitting 34, and the supported portion B is constituted by the male screw of the operation bolt 75 fitted onto the metal fitting 76. The screw thrust of the operation bolt 75 causes the pressing metal fitting 76 to be brought into sealing contact with the bottom surface of the gas receiving hole 10.

18 to 20 show a tenth embodiment,
18 is a system diagram of a cylinder valve with a pressure reducing valve, FIG. 19 is a plan view of the valve, and FIG. 20 is a sectional view taken along the line XX-XX of FIG.

As shown in FIG. 18, the pressure reducing valve 12 is provided between the stop valve 15 and the gas outlet hole 8 in the valve box 4 of the cylinder valve 3.
1 and a check valve 123 for holding the residual pressure are provided in order, and
A secondary side safety valve 124 is branched from between these valves 121 and 123.

A specific structure of the valve 3 will be described with reference to FIGS. 19 and 20. The gas receiving passage 22 having the gas receiving check valve 23 and the gas receiving hole 10 are configured in substantially the same manner as the valve shown in FIG. 15, but an annular flow path is formed in the check valve body 30. The difference is that you did.

The stop valve chamber 13 is a pressure reducing valve chamber 126 of the pressure reducing valve 121.
And through the check valve chamber 128 of the residual pressure holding check valve 123 to the gas outlet hole 8. In the pressure reducing valve chamber 126, a pressure reducing valve body and a pressure adjusting spring (neither is shown) are inserted. The residual pressure holding check valve 123 is configured by elastically pressing the check valve body 130 inserted in the check valve chamber 128 toward the check valve seat 127 by the check spring 131.

When the stop valve body 16 is opened by the handle wheel 19, the check valve 123 operates as follows. When the residual pressure of the gas cylinder 1 exceeds the set pressure,
The residual pressure resists the valve closing force of the check spring 131, separates the check valve body 130 from the check valve seat 127, and allows the gas in the cylinder 1 to flow from the check valve seat 127 to the gas outlet hole 8. Spill to. On the other hand, when the residual pressure of the cylinder 1 has decreased to the set pressure, the valve closing force of the check spring 131 overcomes the valve opening force of the gas pressure and causes the check valve body 130 to move to the check valve seat. The cylinder 1 is brought into close contact with 127 to maintain the residual pressure of the cylinder 1 at the set pressure.

When the backflow gas flows from the gas outlet hole 8 into the check valve seat 127, the check valve body 130 increases the pressure of the backflow gas in addition to the valve closing force of the check spring 131. Acting as the valve closing force of the check valve body 130,
I will put a close contact with.

As described above, the check valve 123 is provided in the gas outlet passage 14.
When the residual pressure is retained in the cylinder 1 by incorporating the above, it is possible to prevent outside air from entering the cylinder 1 even if the handle 19 is accidentally opened and operated while the cylinder 1 is empty. Therefore, it is possible to rationalize the gas filling work by omitting the vacuuming process of the recovered cylinder 1.

21 to 23 show modified examples of the connection structure between the cylinder valve 3 and the gas filling fitting 34, respectively. In these modified examples, members having the same configurations as those in FIGS. 3 to 5 are designated by the same reference numerals.

FIG. 21 shows a first modification. The valve 3 has the same structure as that of FIG. Further, the sealing tube 42 is fixed by screwing to the left end portion of the casing 38,
The sealing member 50 mounted on the outer peripheral surface of the sealing cylinder 42 is brought into sealing contact with the inner peripheral surface of the gas receiving hole 10. Since the sealing surface on the cylinder valve 3 side is provided inside the nozzle 9 as described above, it is possible to prevent the sealing surface on the cylinder valve 3 side from being damaged even when the gas cylinder is handled roughly, and to prolong the sealing life. Can be kept good over a period of time.

FIG. 22 shows a second modification, which is similar to that of FIG.
Has been changed as follows. As shown in the lower half of the drawing, when the sleeve 51 fitted on the casing 38 is retracted against the pushing spring 54, the engagement between the ball 65 and the groove 65 on the outer peripheral surface of the gas receiving nozzle 9 is released, and The gas filling fitting 34 can be attached to and detached from the nozzle 9. On the other hand, as shown in the upper half of the figure, when the sleeve 51 is advanced by the spring 54, the ball 66 engages with the groove 65 and the metal fitting 34 is fixed to the nozzle 9. The groove 65 constitutes the supporting portion A, and the ball 66 is
Constitutes a supported portion B.

FIG. 23 shows a third modification, in which a sealing member 50 is attached to the inner peripheral surface of the gas receiving hole 10 and the sealing member 5 is attached.
The outer peripheral surface of the distal end portion of the casing 38 is brought into sealing contact with 0. The sealing member 50 can also be attached to the bottom wall of the gas receiving hole 10.

The above-described embodiments and modifications can be modified as follows. The valve-opening tool operating means 55 provided on the gas filling fitting 34 may be a double-acting cylinder, or may be a manually-operated type using screw thrust. In receiving the pressure acting on the filling metal fitting 34 from the gas receiving hole 10 at the time of filling the fresh gas, instead of receiving it by the support portion A of the gas receiving nozzle 9, it is also possible to receive it by the main body portion of the valve box 4 or the cylinder 1. Is.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cylinder valve according to the first embodiment.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a vertical cross-sectional view showing a state in which a gas filling metal fitting is fixed to the valve.

FIG. 4 is a view showing another cross section of the gas filling metal fitting.

5 is a view taken along the line VV of FIG.

FIG. 6 is a system diagram of a gas filling system using the valve and the metal fitting.

FIG. 7 is a partial view showing another example of use of the gas filling system.

FIG. 8 is a view showing a modified example of the gas filling system and corresponding to FIG. 6.

9 is a cross-sectional view of a gas filling fitting used in the system of FIG. 8 above.

FIG. 10 shows a second embodiment and is a diagram corresponding to FIG.

FIG. 11 is a view showing a third embodiment and corresponding to FIG.

FIG. 12 is a view showing a fourth embodiment and corresponding to FIG. 1.

FIG. 13 is a view showing a fifth embodiment and corresponding to FIG. 1.

FIG. 14 shows a sixth embodiment and corresponds to FIG.

FIG. 15 shows a seventh embodiment and is a view corresponding to FIG.

FIG. 16 is a partial view showing an eighth embodiment and corresponding to FIG.

FIG. 17 is a partial view corresponding to FIG. 3, showing a ninth embodiment.

FIG. 18 is a system diagram of a cylinder valve according to the tenth embodiment.

FIG. 19 is a plan view of the valve.

20 is a cross-sectional view taken along the line XX-XX of FIG.

FIG. 21 is a view corresponding to FIG. 3, showing a first modification of the connection structure between the cylinder valve and the gas filling fitting.

FIG. 22 is a partial view corresponding to FIG. 3, showing a second modification of the above connection structure.

FIG. 23 is a partial view corresponding to FIG. 3, showing a third modification example of the above connection structure.

[Explanation of symbols]

4 ... Valve box, 5a ... Leg bottom surface, 6 ... Gas inlet hole, 8 ... Gas outlet hole, 10 ... Gas receiving hole, 11 ... Gas inlet passage, 12 ...
Stop valve seat, 13 ... Stop valve chamber, 16 ... Stop valve body, 20 ... Opening / closing operation means, 22 ... Gas receiving passage, 27 ... Check valve seat, 28
... check valve chamber, 30 ... check valve body, 31 ... check spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsumasa Kagomoto 4-6-1 Shimozakabe, Amagasaki City, Hyogo Prefecture Neriki Co., Ltd.

Claims (3)

[Claims] 1. A gas inlet hole (6) opened on a lower surface (5a) of a leg portion of a valve box (4) is provided with a gas inlet passage (11), a stop valve seat (12) and a stop valve chamber (13). The stop valve body (16) inserted into the stop valve chamber (13) can be opened and closed to the stop valve seat (12) by the opening and closing operation means (20). A gas receiving hole (10) is opened in an outer peripheral surface different from the gas outlet hole (8) in the outer peripheral surface of the valve box (4), and the gas receiving hole (10) and the leg are formed. In a cylinder valve in which a gas receiving path (22) communicating with the lower surface (5a) of the part is provided in the valve box (4), a check valve seat (27) is installed in the gas receiving path (22). Stop valve
(28) is provided in order from the gas receiving hole (10), the check valve body (30) is inserted into the check valve chamber (28), and the check valve body (30) is inserted into the check valve body (30). A cylinder valve, comprising a check spring (31) provided on the stop valve seat (27) for elastically closing the valve. 2. The cylinder valve according to claim 1, wherein the gas receiving passage (22) is connected to an intermediate portion of the gas inlet passage (11) in an intersecting manner. 3. The cylinder valve according to claim 2, wherein a check valve chamber (28) is formed at the intersection.