JP6279411B2 - Differential pressure vessel valve - Google Patents

Description

  The present invention relates to a differential pressure type container valve for a fire extinguisher storage container filled with a fire extinguisher for discharge into a fire extinguishing target section.

  Conventionally, as a gas-based fire extinguishing equipment that extinguishes fire by releasing a fire extinguisher into the fire extinguishing target area and maintaining the fire extinguishing agent concentration in the fire extinguishing target level above the flame extinguishing concentration, Those that use gas or the like have been put into practical use.

  In this type of gas fire extinguishing equipment, for example, nitrogen gas is pressurized and filled into a plurality of fire extinguishing agent storage containers and stored, and a connecting pipe is connected to each container via a differential pressure type container valve. The connecting pipe is connected to one collecting pipe, and this collecting pipe is connected to a main pipe extending to each fire extinguishing target section.

  As said differential pressure type | formula container valve, what is shown by Fig.11 (a) is known (for example, refer patent document 1).

Japanese Patent No. 2834103

  A differential pressure type container valve 100 shown in FIG. 11 (a) has a piston member 104 disposed in a valve box 103 so as to reciprocate between a fire extinguishing agent discharge passage 101 and an atmosphere release passage 102. The compression nut spring 105 urges the extinguishing agent discharge flow path 101 in the closing direction, and the cap nut 107 is valved with an open sealing plate 106 that closes the air open flow path 102 interposed between the valve box 103 and the valve nut 103. By fastening to the box 103 and closing the atmosphere opening flow path 102, the open sealing plate 106 is cleaved from the operation port 107 a provided in the cap nut 107 to reduce the pressure of the atmosphere opening flow path 102 to atmospheric pressure, The fire extinguishing agent discharge flow path 101 is opened by moving the piston 104 to the atmosphere release flow path 102 side against the biasing force of the spring member 105.

Here, a perforated disc-shaped gasket 108 is disposed between the valve box 103 and the cap nut 107 so as to seal between the two.
The gasket 108 is made of a relatively thick cloth-filled bakelite, and has a holding hole 108a in the center. In addition to the sealing function of the fastening portion between the valve box 103 and the cap nut 107, the tip portion is in the piston 104. In addition to a spring member holding function for holding the proximal end portion of the inserted spring member 105 with the holding hole 108a and an impact absorbing function for receiving the piston 104 and absorbing an impact during the valve opening operation of the piston 104, the atmosphere open channel 102 It has a function to seal the fire extinguishing agent.

As shown in FIG. 11B, the differential pressure type container valve 100 is assembled as follows.
First, the cap nut 107 is arranged below the valve box 103 in a state where the air release channel 102 side is directed downward, the open sealing plate 106 and the gasket 108 are fitted into the cap nut 107, and the tip portion is a piston. The base end portion of the spring member 105 inserted into the 104 is fitted into the central holding hole 108a of the gasket 108, and the piston 104 is inserted into the valve box 103 from the atmosphere release flow path 102 side while supporting the piston 104 by hand. To do.
Then, when the female screw of the cap nut 107 reaches the corresponding male screw of the valve box 103, the cap nut 107 is slowly moved into the valve box 103 while taking care not to remove the spring member 105 from the holding hole 108a of the gasket 108. In the middle of the tightening operation, a piston presser rod (not shown) is inserted from the extinguishing agent discharge flow path 101 side of the valve box 103, and tightened to the end while checking the stroke of the piston 104 as appropriate. Tighten with a specified tightening torque using a torque wrench (not shown).

By the way, there is a tendency that production of bakelite with cloth tends to be discontinued due to a decrease in demand, and it will no longer be possible to use a gasket 108 made of bakelite with cloth.
For this reason, the appearance of a differential pressure type container valve having a necessary sealing function, a spring member holding function, and an impact absorbing function without using the cloth-made bakelite gasket 108 is desired.

  In addition, the conventional differential pressure type container valve 100 using the cloth-made bakelite gasket 108 must be assembled as described above, and requires craftsmanship that requires skilled skills. However, it was not an assembling work that could be done, and there was a problem that the assemblability was bad.

  In view of the above circumstances and the problems of conventional differential pressure type container valves, the present invention has a necessary sealing function, spring member holding function, and shock absorbing function without using a cloth-made bakelite gasket. It is another object of the present invention to provide a differential pressure type container valve that can be improved and can be easily assembled.

  In order to achieve the above object, the differential pressure type container valve of the present invention uses a spring member to discharge a fire extinguisher with a piston disposed in a valve box so as to be able to reciprocate between a fire extinguishing agent discharge flow path and an air release flow path. Energize in the direction to close the flow path, and close the air release flow path by fastening the cap nut to the valve box with an open sealing plate that closes the air release flow path interposed between the valve box and the cap. The open sealing plate is cleaved from the operation port provided on the nut to reduce the pressure of the air release flow path to atmospheric pressure, so that the piston moves to the air release flow path side against the urging force of the spring member and extinguishes fire. In a differential pressure type container valve in which the agent discharge flow path is opened, a spring holder having a spring holding part for holding a spring member and an impact absorbing part for receiving the piston and absorbing an impact when the piston is opened is a valve box. As well as being attached to the Characterized in that disposed an O-ring for sealing between both between the valve body and the cap nut.

  In this case, an annular stepped portion opened to the open sealing plate side can be formed in the spring holder, and an O-ring groove into which the O-ring is fitted can be formed by this stepped portion and the valve box.

  Further, an annular stepped portion opened to the open sealing plate side can be formed in the valve box, and an O-ring groove into which the O-ring is fitted can be formed by this stepped portion and the spring holder.

According to the differential pressure type container valve of the present invention, the gap between the two is sealed by the O-ring disposed between the valve box and the cap nut, and the spring member is held by the spring holding portion of the spring holder. Since the impact at the time of opening the piston is absorbed by the impact absorbing portion of the holder, the holder must have the necessary sealing function, spring member holding function, and impact absorbing function without using a cloth-made bakelite gasket. it can.
In addition, since the spring holder that holds the spring member is attached to the valve box in a state of retaining, the cap nut may be tightened after the piston and the spring member are assembled. Compared to the fact that the cap nut must be tightened simultaneously with the piston assembling operation, and that the spring member must not be removed from the gasket holding hole during the cap nut tightening operation. It becomes easy and the assemblability can be improved.

  Further, by forming an annular stepped portion opened on the open sealing plate side in the spring holder, and forming an O-ring groove into which the O-ring is fitted by this stepped portion and the valve box, one of the O-ring grooves is formed. Since the portion is formed by the spring holder, the valve box can be made compact compared to the case where the O-ring groove is directly formed in the valve box.

  In addition, an annular stepped portion opened to the open sealing plate side is formed in the valve box, and an O-ring groove into which the O-ring is fitted is formed by the stepped portion and the spring holder, thereby providing one O-ring groove. Since the portion is formed by the spring holder, the valve box can be made compact compared to the case where the O-ring groove is directly formed in the valve box.

It is a longitudinal section showing a differential pressure type container valve concerning a 1st embodiment of the present invention. It is the A section enlarged view of FIG. It is assembly explanatory drawing (1) of the differential pressure type | formula container valve. It is assembly explanatory drawing (2) of the differential pressure type container valve. It is assembly explanatory drawing (3) of the differential pressure type | formula container valve. It is a valve-opening operation explanatory view of the differential pressure type container valve. It is a longitudinal cross-sectional view which shows the differential pressure type container valve which concerns on the 2nd Embodiment of this invention. It is the C section enlarged view of FIG. It is a longitudinal cross-sectional view which shows the differential pressure type container valve which concerns on the 3rd Embodiment of this invention. It is the D section enlarged view of FIG. It is a figure which shows the conventional differential pressure type container valve, (a) is a longitudinal cross-sectional view, (b) is an assembly explanatory drawing.

  Next, an embodiment of a differential pressure type container valve of the present invention will be described based on the drawings.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing a differential pressure type container valve according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of part A of FIG.

<Description of schematic configuration of differential pressure type container valve>
A differential pressure type container valve 1A shown in FIG. 1 is a valve box 3A attached to a fire extinguishing agent storage container 2 filled with a fire extinguishing agent such as carbon dioxide gas or nitrogen gas for discharging into a fire extinguishing target section. And a fire extinguisher can be supplied to the fire extinguishing target section via a connecting pipe, a collecting pipe, a main pipe, etc. (not shown) connected to the valve box 3A. It is like that.

<Description of valve box>
The valve box 3A has a fire extinguishing agent discharge flow path 4 extending toward one side, and an air release flow path 5 positioned on the opposite side of the fire extinguishing agent discharge flow path 4 and extending toward the other side. A piston housing part 6 disposed between the fire extinguishing agent discharge flow path 4 and the atmosphere opening flow path 5 and a fire extinguishing agent introduction flow path 7 extending toward the side of the piston housing part 6 are provided.
In the valve box 3A, the fire extinguishing agent discharge port 8 includes the fire extinguishing agent discharge flow path 4, and the atmosphere opening port 9 includes the fire extinguishing agent introduction flow path 7 so as to include the air opening flow path 5. As shown, the fire extinguishing agent introduction port 10 is provided in a protruding manner.
A connection pipe (not shown) can be connected to the fire extinguishing agent discharge port 8, and a cap nut 11 can be screwed into the atmosphere opening port 9.
The extinguishing agent introduction port 10 can be screwed into the attachment port of the extinguishing agent storage container 2, and the extinguishing agent introduction port unit 10 is screwed and fixed to the attachment port so that the extinguishing agent from the extinguishing agent storage container 2 is fixed. Can be introduced into the valve box 3A.

<Description of cap nut>
The cap nut 11 has a mounting recess 11a that can be screwed to the atmosphere opening port 9 and opened on one side, and has an operation port 11b that has a central portion penetrating the mounting recess 11a and opened on the other side. doing.
The cap nut 11 is formed with a communication hole 12 that allows the operation port 11b to communicate with the outside.

<Description of the closed structure of the open air channel>
A disc-shaped opening sealing plate 13 that blocks the atmosphere opening flow path 5 is pressed against the end surface of the atmosphere opening port portion 9, and the opening sealing plate 13 is interposed between the opening portion 9 and the atmosphere opening port portion 9. By fastening a cap nut 11 to the atmosphere opening 9, the atmosphere opening flow path 5 is closed.

<Description of piston>
A piston 15 is slidably disposed in the piston accommodating portion 6 so as to be reciprocally movable between the fire extinguishing agent discharge flow path 4 and the atmosphere opening flow path 5.
The piston 15 has a valve body 16 embedded in one end portion directed toward the extinguishing agent discharge flow path 4, and a spring member (compression coil spring) at the other end portion directed toward the atmosphere release flow path 5. 17 is configured to be insertable.

A valve seat 18 that can come into contact with the valve body 16 of the piston 15 protrudes from a boundary portion between the piston housing 6 and the extinguishing agent discharge passage 4.
The piston 15 is biased by the spring member 17 in the direction of closing the extinguishing agent discharge flow path 4, that is, the direction of pressing the valve body 16 against the valve seat 18.

<Description of spring holder and its mounting structure>
As shown in FIG. 2, a stepped portion 20 is formed at the boundary between the piston accommodating portion 6 and the air opening flow path 5 on the inner periphery of the air opening port portion 9, and the step portion 20 and the air opening port portion are formed. 9 is formed with a spring holder mounting hole 21.
The spring holder mounting hole 21 includes a straight fitting hole portion 21a, a taper fitting hole portion 21b, and an O-ring that are formed in this order from the stepped portion 20 toward the end face of the atmosphere opening port portion 9 in the direction of the arrow B in FIG. It is comprised by the fitting hole part 21c.
The straight fitting hole 21a is a round hole extending straight in the direction of arrow B, and the taper fitting hole 21b is a round hole having an inner diameter that increases in the direction of arrow B. The O-ring fitting hole 21c is a round hole having the same diameter as that of the taper fitting hole portion 21b and extending straight in the direction of arrow B.

A spring holder 22 is fitted in the spring holder mounting hole 21.
The spring holder 22 is made of a synthetic resin such as polyamide, polyolefin, polyvinyl chloride, or fluororesin, and can be abutted against the stepped portion 20 and can be fitted into the straight fitting hole portion 21a, and a taper fitting hole. An annular step portion 22c opened to the side of the open sealing plate 13 so that a predetermined gap is generated between the tapered flange portion 22b engaged with the portion 21b and the O-ring fitting hole portion 21c, and the other end portion And an end wall portion 22d formed so as to protrude toward the center.
The straight fitting hole portion 21a and the cylindrical portion 22a are in a fitting relationship having a fastening allowance. When the cylindrical portion 22a is press-fitted into the straight fitting hole portion 21a, a spring is brought into the atmosphere opening port portion 9. The holder 22 is mounted in a retaining state against the urging force of the spring member 17.

  As a means for attaching the spring holder 22 to the atmosphere opening port 9 in a retaining state, a male screw is formed on the inner peripheral surface of the straight fitting hole portion 21a and is screwed into the female screw. Is formed on the outer peripheral surface of the cylindrical portion 22a, and the cylindrical portion 22a is screwed into the straight fitting hole portion 21a, or is elastically deformed by pushing the cylindrical portion 22a into the straight fitting hole portion 21a. The required ring-shaped projection is formed on the outer peripheral surface of the cylindrical portion 22a, and the cylindrical portion 22a is resisted against the urging force of the spring member 17 by the elastic repulsive force of the ring-shaped projection with respect to the straight fitting hole portion 21a. It is also possible to adopt a configuration in which the pushing state is maintained (the same applies to the second and third embodiments described later).

The end wall portion 22d of the spring holder 22 includes a spring holding portion 23 and an impact absorbing portion 24 that are formed around an opening through which a blade body 30 described later can be inserted.
The spring holding portion 23 includes a spring seat surface 23a that supports the other end of the spring member 17, and a spring surrounding surface 23b that surrounds the other end of the spring member 17. The spring member 23 is formed by the spring seating surface 23a and the spring surrounding surface 23b. It is comprised so that the other end part of 17 may be hold | maintained.
The shock absorbing portion 24 has a piston receiving surface 24a that receives the piston 15 when the piston 15 is opened (see FIG. 6), and is formed to have a relatively thick dimension (t ₁ ). The impact at the time of the collision of 15 can be absorbed effectively.
Further, when the piston 15 collides with the impact absorbing portion 24 of the spring holder 22 and the contact state is maintained by the valve opening operation, the fire extinguishing agent from the fire extinguishing agent introduction flow path 7 is brought into contact between the piston housing portion 6 and the piston 15. It is possible to prevent leakage through the opening 13a of the open sealing plate 13 that has flowed into the atmosphere open flow path 5 and to the outside.

<Description of O-ring groove>
An O-ring groove 25 is formed between the atmosphere opening 9 and the spring holder 22 by an O-ring fitting hole portion 21c and an annular step portion 22c. The step portion 22c is formed in the O-ring groove 25. And an O-ring fitting hole 21c and an open sealing plate 13 are fitted into an O-ring 26, which can be simultaneously contacted with each other, thereby sealing between the air opening 9 and the cap nut 11 screwed thereto. It has become so.

The assembly of the differential pressure type container valve 1 </ b> A configured as described above will be described below mainly using FIGS. 3 to 5.
First, as shown in FIG. 3A to FIG. 3B, the spring member 17 is inserted into the piston 15, and the open sealing plate 13 is fitted into the inner part of the mounting recess 11 a in the cap nut 11.
Next, as shown in FIGS. 4A to 4B, the piston 15 in which the spring member 17 is inserted is inserted into the piston accommodating portion 6 of the valve box 3 </ b> A. The spring holder 22 is fitted into the spring holder mounting hole 21 so that the end portion is held by the spring holding portion 23.
At this time, as shown in FIG. 2, since the straight fitting hole portion 21a and the cylindrical portion 22a are in a fitting relationship having a tightening margin, the cylindrical portion 22a is press-fitted into the straight fitting hole portion 21a. As a result, the spring holder 22 can be attached to the atmosphere opening port 9 in a retaining state against the urging force of the spring member 17.
Next, as shown in FIG. 4B, the O-ring 26 is fitted into the O-ring groove 25.
Then, as shown in FIGS. 5A to 5B, when the female screw of the cap nut 11 reaches the male screw of the atmosphere opening port 9, the cap nut 11 is moved to the atmosphere opening port 9 to the end. The assembly of the differential pressure type container valve 1A is completed by tightening and tightening with a specified tightening torque using a torque wrench (not shown).

  Next, the operation of the differential pressure type container valve 1A will be described below with reference to FIGS.

<Explanation of valve operation when filling with extinguishing agent>
As shown in FIG. 1, a fire extinguisher (for example, nitrogen gas) is pressurized to the fire extinguisher storage container 2 from the side of the fire extinguisher discharge flow path 4 of the valve box 3A in a state of being attached to the fire extinguisher storage container 2. Fill.
In this case, the piston 15 receives the pressure of the extinguishing agent flowing in from the extinguishing agent discharge channel 4 side and moves to the atmosphere opening channel 5 side against the urging force of the spring member 17. The extinguishing agent storage container 2 is filled with the extinguishing agent through the channel 4 and the extinguishing agent introduction channel 7.
As the filling of the extinguishing agent into the extinguishing agent storage container 2 proceeds, the extinguishing agent gradually flows into the atmosphere opening flow path 5 through the minute gap between the piston accommodating portion 6 and the piston 15. Therefore, there is no difference in pressure among the three of the fire extinguishing agent discharge flow path 4, the air release flow path 5 and the fire extinguishing agent introduction flow path 7, so that the piston 15 is closed in the closing direction, that is, the fire extinguishing, by the biasing force of the spring member 17. It moves to the agent discharge flow path 4 side, the valve body 16 of the piston 15 comes into contact with the valve seat 18, the fire extinguishing agent discharge flow path 4 and the fire extinguishing agent introduction flow path 7 are blocked, and the fire extinguisher storage container 2 Complete the filling with fire extinguishing agent.
Thereafter, a pipe such as a connecting pipe and a collecting pipe (not shown) is connected to the fire extinguishing agent discharge port 8 to constitute a gas fire extinguishing equipment.

  By the way, when a fire occurs, the blade body 30 is inserted from the operation port 11b formed in the cap nut 11 by automatic or manual operation of a known opening device (not shown) as shown in FIG. The open sealing plate 13 is cleaved by the blade body 30, and an opening 13 a having a required diameter is formed in the open sealing plate 13.

<Explanation of valve operation during fire extinguishing agent discharge>
As a result of the opening operation of the open sealing plate 13, a part of the extinguishing agent is released from the atmosphere opening flow path 5 into the atmosphere through the communication hole 12 through the opening 13 a and the operation port 11 b formed in the opening sealing plate 13. At the same time, the remaining part is discharged into the atmosphere from the operation port 11b through a communication hole (not shown) communicating with the atmosphere provided in the opening device.
As a result, the pressure in the atmosphere opening flow path 5 is reduced to atmospheric pressure, so that the piston 15 receives the pressure of the fire extinguishing agent from the fire extinguishing agent introduction flow path 7 and resists the biasing force of the spring member 17. It moves to the atmosphere opening flow path 5 side and finally collides with the impact absorbing portion 24 of the spring holder 22 to stop its movement.
And by this valve opening operation | movement, piston 15 collides with the impact-absorbing part 24 of the spring holder 22, and when a contact state is maintained, the fire extinguishing agent from the fire-extinguishing agent introduction flow path 7 becomes the piston accommodating part 6, piston 15, and It is possible to prevent leakage to the outside through the opening 13a of the open sealing plate 13 that has been cleaved and flows into the atmosphere opening flow path 5 through the gap.
Due to the movement of the piston 15 toward the atmosphere opening flow path 5, the space between the fire extinguishing agent discharge flow path 4 and the fire extinguishing agent introduction flow path 7 is opened. Thus, the extinguishing agent in the extinguishing agent storage container 2 is released.
When the extinguishing agent discharge in the extinguishing agent storage container 2 proceeds, there is no difference in pressure among the three components of the extinguishing agent discharge channel 4, the air release channel 5 and the extinguishing agent introduction channel 7. Due to the urging force, the piston 15 moves in the closing direction, that is, toward the extinguishing agent discharge flow path 4, and the valve body 16 of the piston 15 comes into contact with the valve seat 18, so 7 is cut off, and the extinguishing agent in the extinguishing agent storage container 2 is stopped.

<Description of effects>
According to the differential pressure type container valve 1A of the first embodiment, the space between the air opening port 9 of the valve box 3A and the cap nut 11 is sealed by the O-ring 26 fitted in the O-ring groove 25, and the spring holder 22. Since the spring member 17 is held by the spring holding portion 23 and the shock absorption portion 24 of the spring holder 22 absorbs the impact during the valve opening operation of the piston 15, the use of the cloth-made bakelite gasket 108 is not necessary. A necessary sealing function, a spring member holding function, and an impact absorbing function can be provided.
In addition, since the spring holder 22 that holds the spring member 17 is configured to be attached to the atmosphere opening port 9 of the valve box 3A in a retaining state, the set of the piston 15 and the spring member 17 shown in FIG. The cap nut 11 shown in FIGS. 5 (a) to 5 (b) may be tightened after the inserting operation. Conventionally, as shown in FIG. 11 (b), the piston 104 and the spring The cap nut 107 must be tightened simultaneously with the assembling operation of the member 105, and care must be taken so that the spring member 105 does not come off the holding hole 108 a of the gasket 108 during the tightening operation of the cap nut 107. As compared with the above, the assembling work becomes easier and the assembling property can be improved.

  An O-ring groove 25 into which the O-ring 26 is fitted is formed by the step portion 22c of the spring holder 22 and the O-ring fitting hole portion 21c in the valve box 3A, and a part of the O-ring groove 25 is the spring holder 22. Compared to the case where the O-ring groove 45 is directly formed in the valve box 3C (see the third embodiment shown in FIGS. 9 and 10), the valve box 3A is more compact. Thus, it is possible to reduce the size of the differential pressure type container valve 1A.

[Second Embodiment]
FIG. 7 is a longitudinal sectional view showing a differential pressure type container valve according to the second embodiment of the present invention, and FIG. 8 is an enlarged view of part C of FIG.
In addition, in the differential pressure type container valve 1B of the second embodiment, the same or similar parts as those of the differential pressure type container valve 1A of the first embodiment are given the same reference numerals in the drawing and detailed description thereof is omitted. In the following, the description will focus on the parts specific to the differential pressure type container valve 1B of the second embodiment.

  As shown in FIG. 7, the differential pressure type container valve 1B of the second embodiment is slightly different from the valve box 3A in the differential pressure type container valve 1A of the first embodiment, but has the same basic structure. The valve box 3B is provided.

<Description of piston>
A piston 35 is slidably disposed in the piston accommodating portion 6 so as to be able to reciprocate between the fire extinguishing agent discharge flow path 4 and the atmosphere opening flow path 5.
The piston 35 is configured such that a valve body 36 into which one end side portion can be in contact with the valve seat 18 and the spring member 17 can be inserted into the other end side portion is fitted and fixed inside a hollow piston main body 35a. ing.

<Description of spring holder and its mounting structure>
As shown in FIG. 8, a round hole-shaped spring holder mounting hole 37 extending straight is formed between the stepped portion 20 formed on the inner periphery of the atmosphere opening port 9 and the end surface of the atmosphere opening port 9. Has been.
An annular stepped portion 38 that is open to the side of the open sealing plate 13 is formed on the inner peripheral edge at the end of the atmosphere opening port 9.

The spring holder 39 fitted into the holder mounting hole 37 has the same outer diameter from one end to the other end, can be abutted against the stepped portion 20, and can be fitted into the spring holder mounting hole 37. , And an end wall portion 39b formed so as to protrude toward the center direction at the other end portion.
The spring holder mounting hole 37 and the cylindrical portion 39a are in a fitting relationship having a tightening allowance. When the cylindrical portion 39a is press-fitted into the spring holder mounting hole 37, the spring holder 39 is inserted into the atmosphere opening port 9. Is mounted in a retaining state against the urging force of the spring member 17.
The end wall portion 39 b of the spring holder 39 has a spring holding portion 40 and an impact absorbing portion 41 that are formed around the opening through which the blade body 30 can be inserted.
The spring holding portion 40 includes a spring seat surface 40a that supports the other end of the spring member 17, and a spring surrounding surface 40b that surrounds the other end of the spring member 17, and the spring member is formed by the spring seat surface 40a and the spring surrounding surface 40b. It is comprised so that the other end part of 17 may be hold | maintained.
The impact absorbing portion 41 has a piston receiving surface 41a that receives the piston 35 when the piston 35 is opened, and is formed to have a relatively thick dimension (t ₂ ). Can be effectively absorbed.

<Description of O-ring groove>
An O-ring groove 42 is formed between the atmosphere opening 9 and the spring holder 39 by an annular stepped portion 38 provided in the atmosphere opening 9 and the outer peripheral surface of the spring holder 39. The groove 42 is fitted with an O-ring 43 that can be in contact with the spring holder 39, the stepped portion 38 and the open sealing plate 13 at the same time. Is sealed.

<Description of effects>
Also by the differential pressure type container valve 1B of the second embodiment as described above, it is possible to obtain the same effects as the differential pressure type container valve 1A of the first embodiment.
The O-ring groove 42 into which the O-ring 43 is fitted is formed by the spring holder 39 and the stepped portion 38 of the valve box 3B, and a part of the O-ring groove 42 is formed by the spring holder 39. Therefore, compared with the case where the O-ring groove 45 is directly formed in the valve box 3C (see the third embodiment shown in FIGS. 9 and 10), the valve box 3B can be made compact. Therefore, the differential pressure type container valve 1B can be downsized.

[Third Embodiment]
FIG. 9 is a longitudinal sectional view showing a differential pressure type container valve according to a third embodiment of the present invention, and FIG. 10 is an enlarged view of part D of FIG.
In addition, in the differential pressure type container valve 1C of the third embodiment, the same or similar parts as those of the differential pressure type container valves 1A and 1B of the above-described embodiments are described in detail with the same reference numerals attached. In the following, the description will focus on the parts specific to the differential pressure type container valve 1C of the third embodiment.

As shown in FIG. 9, the differential pressure type container valve 1C of the third embodiment is slightly different from the valve cases 3A and 3B in the differential pressure type container valves 1A and 1B of the above embodiments, but the basic shape dimensions are slightly different. A valve box 3C having the same structure is provided.
As shown in FIG. 10, in the differential pressure type container valve 1 </ b> C, an O-ring groove 45 is formed on the end face of the atmosphere opening port 9, and an O-ring that can contact the open sealing plate 13 is formed in the O-ring groove 45. 46 is fitted, and thereby the space between the air opening 9 and the cap nut 11 screwed to the air opening 9 is sealed.

<Description of effects>
Also by the differential pressure type container valve 1C of the third embodiment as described above, it is possible to obtain the same effects as the differential pressure type container valves 1A and 1B of the above embodiments.

  As mentioned above, although the differential pressure type | formula container valve of this invention was demonstrated based on several embodiment, this invention is not limited to the structure described in the said embodiment, The structure described in each embodiment is combined suitably. The configuration can be changed as appropriate without departing from the spirit of the invention.

  The differential pressure type container valve of the present invention can be provided with a necessary sealing function, a spring member holding function, and an impact absorbing function without using a cloth-made bakelite gasket, and can improve assemblability. Therefore, it can be suitably used as an on-off valve for a fire extinguisher storage container used in a gas fire extinguishing facility.

1A to 1C Differential pressure type container valve 2 Extinguishing agent storage container 3A to 3C Valve box 4 Extinguishing agent discharge channel 5 Atmospheric release channel 11 Cap nut 11b Operation port 13 Open sealing plate 15 Piston 17 Spring member 22, 39 Spring holder 23, 40 Spring retaining part 24, 41 Shock absorbing part 26, 43, 46 O-ring

Claims (3)

  The piston disposed in the valve box so as to be reciprocally movable between the fire extinguishing agent discharge flow path and the atmosphere open flow path is urged by a spring member in the direction to close the fire extinguisher discharge flow path, and the air release flow path is A cap nut is fastened to the valve box with the open sealing plate to be closed between the valve box and the atmosphere opening flow path closed, and the opening sealing plate is cleaved from the operation port provided in the cap nut to open the atmosphere. In the differential pressure type container valve that opens the extinguishing agent discharge flow path by moving the piston to the open air flow path side against the biasing force of the spring member by reducing the pressure of the open flow path to atmospheric pressure, A spring holder having a spring holding part for holding the member and an impact absorbing part for receiving the piston and absorbing the impact during the valve opening operation of the piston is attached to the valve box in a retaining state, and the valve box and the cap nut O sealing between both Differential pressure container valve, characterized in that arranged the ring.   An annular stepped portion opened to the open sealing plate side is formed in the spring holder, and an O-ring groove into which the O-ring is fitted is formed by the stepped portion and the valve box. 1. The differential pressure type container valve according to 1.   An annular stepped portion opened to the open sealing plate side is formed in the valve box, and an O-ring groove into which the O-ring is fitted is formed by the stepped portion and the spring holder. 1. The differential pressure type container valve according to 1.

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