JP2020168265A - Deluge valve and check valve structure - Google Patents

Abstract

To provide a deluge valve that can be easily assembled by a check valve mechanism of a cartridge structure and that can exert a stable check seal function, and a check valve structure.SOLUTION: A primary-side channel 11, a secondary-side channel 12 and a pressure control chamber 14 are divided by a main valve body 3. The main valve body 3 is provided with an internal channel 30 for communicating the primary-side channel 11 with the pressure control chamber 14. A part of the internal channel 30 is detachably provided with a check valve 4 that is incorporated in a cartridge-integrated structure enabling only the inflow of a fluid into the pressure control chamber 14 from the primary-side channel 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a simultaneous release valve and a check valve structure used in fire extinguishing equipment such as sprinkler equipment and foam fire extinguishing equipment.

Simultaneous release valves are mainly used in fire extinguishing equipment such as sprinkler equipment and foam fire extinguishing equipment, and usually have a bottomed cylindrical piston-shaped valve between the primary side flow path and the secondary side flow path inside the valve box. A body is provided, and the flow path is opened and closed by the vertical movement of the piston-shaped valve body. A check valve mechanism is provided in the piston-shaped valve body, and the check valve mechanism allows fluid to flow into the pressure sensing pressure control chamber provided on the back side of the piston-shaped valve body from the primary side flow path, and the pressure control chamber. The backflow of the fluid from the to the primary side flow path is prevented.

As a simultaneous release valve of this type, for example, the simultaneous release valve of Patent Document 1 is disclosed. In this simultaneous release valve, a ball-shaped valve body, a coil spring, a spring retainer, and an O-ring for the valve seat are provided as a check valve mechanism, and the valve seat O-ring is housed in the concave portion formed in the piston-shaped valve body. The spring retainer is screwed into the piston-shaped valve body, and the coil spring and the ball valve body are arranged at predetermined positions in the concave portion. As a result, the spring retainer prevents the ball-shaped valve body, the coil spring, and the O-ring for the valve seat from coming off from the piston-shaped valve body, and the ball-shaped valve body is elastically urged by the coil spring to function as a check valve. Is demonstrated.

Japanese Patent No. 2532023

However, in the check valve structure of the simultaneous release valve of Patent Document 1, the ball-shaped valve body, the O-ring for the valve seat, the coil spring, and the spring retainer are separately attached to the piston-shaped valve body, which complicates assembly. There is a problem of doing. Specifically, when a check valve mechanism is provided, the spring retainer is screwed in against the elastic force of the coil spring while accommodating the valve seat O-ring in the concave portion of the piston-shaped valve body, and this coil spring. And because it is necessary to properly arrange the ball valve body in the concave part, it takes time and effort to assemble.

Since the valve seat O-ring and the ball-shaped valve body are separately incorporated into the concave portion of the piston-shaped valve body, the assembly accuracy of both is not constant, and variations are likely to occur in these areas. In addition to this, the valve seat O-ring is attached by locking the outer peripheral side to the stepped portion formed in the concave portion, so that the fluid pressure when the ball-shaped valve body moves in the valve opening direction. May cause misalignment. For these reasons, the sealing property may become unstable and leakage may occur between the ball-shaped valve body and the valve seat O-ring.

Since the ball-shaped valve body is overlapped and sealed on the O-ring housed in the concave part, the height of the check valve mechanism that combines these O-rings and the ball-shaped valve body is increased, and the entire simultaneous release valve is opened. Also has the problem of increasing in size.
Due to this structure, the O-ring is crushed as the fluid pressure in the pressure control chamber increases, and the O-ring is permanently deformed or worn out, leading to a decrease in the sealing property of the check valve mechanism.

The present invention has been developed in order to solve the conventional problems, and an object of the present invention is that it can be easily assembled by a check valve mechanism having a cartridge structure and can exhibit a stable check valve function all at once. The purpose is to provide an open valve as well as a check valve structure.

In order to achieve the above object, the invention according to claim 1 is a simultaneous opening valve in which a primary side flow path, a secondary side flow path, and a pressure control chamber are partitioned by a main valve body, and a primary side flow is applied to the main valve body. An internal flow path that communicates the path and the pressure control chamber is provided, and a part of this internal flow path is incorporated into a cartridge integrated structure that allows only fluid to flow from the primary side flow path into the pressure control chamber. It is a simultaneous opening valve with a detachable check valve.

In the invention according to claim 2, a check valve is mounted in a storage chamber provided in the internal flow path of the main valve body, and the check valve has a ball valve body housed in a substantially cylindrical casing having openings at both ends. The O-ring is mounted near the opening of the casing in this state to prevent the ball valve from falling out of the opening. The check valve has an O-ring in the accommodation chamber. It is a simultaneous release valve that is housed in the storage chamber so as to be in contact with the inner wall surface, and the boundary portion between the casing and the inner wall surface is sealed by this O-ring.

According to the third aspect of the present invention, the O-ring is a simultaneous release valve fitted in a mounting groove formed on the inner circumference of the casing.

The invention according to claim 4 is a simultaneous release valve in which a ball valve body is urged inside the casing toward the opening side of the casing.

The invention according to claim 5 is a check valve structure in which a check valve is detachably mounted in a casing provided in an internal flow path of a predetermined body, and the check valve has a substantially cylindrical shape having openings at both ends. With the ball valve body housed in the casing, an O-ring is mounted near one opening of the casing to prevent the ball valve body from falling off from one opening. The check valve has a check valve structure in which the O-ring is housed in the storage chamber so as to abut against the inner wall surface of the storage chamber, and the boundary portion between the casing and the inner wall surface is sealed by the O-ring. is there.

The invention according to claim 6 is a check valve structure in which a ball valve body is urged on one opening side inside the casing.

According to the invention of claim 1, by providing the check valve incorporated in the cartridge integrated structure in advance, the check valve mechanism can be easily incorporated into the main valve body simply by attaching the check valve to the main valve body. .. In addition, since the check valve mechanism is integrated, the pressure control chamber is replenished with fluid from the primary side flow path through the check valve while enhancing the assembly accuracy of each part and demonstrating a stable check seal function. Moreover, the backflow of the fluid from the pressure control chamber to the primary side flow path can be reliably prevented.

According to the invention of claim 2, a check valve having a cartridge-integrated structure is provided near the opening of the casing only by mounting an O-ring, and the check valve is sandwiched between the casing and the accommodation chamber in a sealed state. It can be attached to the main valve body while doing so. As a result, the position of the O-ring is restricted between the casing and the accommodation chamber to prevent the O-ring from falling off or misaligning, and the O-ring prevents the ball valve body from falling off to the internal flow path side. Therefore, the ball valve body can be brought into contact with the O-ring to seal it, and the reverse sealing function can be exhibited. As described above, the cartridge integrated structure allows the check valve to be easily incorporated into the main valve body, and the O-ring and the ball valve body can be arranged at predetermined positions, so that the sealing performance is also improved.
Further, since the O-ring can serve as both a lid and a reverse seal in the cartridge integrated structure, the overall height can be minimized to reduce the size, and the inner diameter side of the O-ring is the flow path. Therefore, a large flow rate can be secured. Since the amount of crushing of the O-ring can be easily adjusted when the cartridge integrated structure is installed, the O-ring is not crushed more than necessary, preventing permanent deformation, wear, and damage of the O-ring and suppressing deterioration of sealing performance. Will be possible.

According to the invention of claim 3, by fitting the O-ring into the mounting groove, the check valve having an integrated cartridge structure can be easily assembled, and the O-ring is prevented from falling off to prevent the ball valve body from coming off. it can. The O-ring can be easily attached and detached, and internal maintenance can be easily performed.

According to the invention of claim 4, by urging the ball valve body to the opening side of the casing, the ball valve body is held in contact with the O-ring in a no-load state even when the casing is arranged in all directions. Therefore, it becomes easy to exert the non-return sealing function. Therefore, a good check valve function can be exhibited not only when it is provided in the flow path in the vertical direction but also when it is arranged in the horizontal direction or diagonally.

According to the invention of claim 5, the ball valve body and the O-ring having the check valve function are incorporated in the cartridge integrated structure in advance, and the check valve can be configured in a predetermined body, so that the ball valve body and the O-ring are separated. It can be easily provided while preventing this. As a result, the check valve can be easily provided at an arbitrary position in the flow path, and the degree of freedom in arranging the check valve in the piping design can be increased. A check valve is provided in the cartridge integrated structure in the vicinity of the opening of the casing only by mounting the O-ring, and this check valve can be mounted while sandwiching the O-ring between the casing and the housing chamber of the body in a sealed state. As a result, the position of the O-ring is regulated to surely prevent it from falling off or misaligning, and the ball valve body is abutted and sealed with the O-ring while being prevented from falling off to the inlet side flow path side. The stop seal function can be exerted. In this way, the cartridge integrated structure allows the check valve to be easily incorporated into the internal flow path of a predetermined body, and the O-ring and the ball valve body can be arranged at a predetermined position, so that the sealing performance is also improved.
Further, since the O-ring can serve as both a lid and a reverse seal in the cartridge integrated structure, the overall height can be minimized to reduce the size, and the inner diameter side of the O-ring is the flow path. It is also possible to secure a large flow rate. Since the amount of crushing of the O-ring can be easily adjusted when the cartridge integrated structure is installed, the O-ring is not crushed more than necessary, preventing permanent deformation, wear, and damage of the O-ring and suppressing deterioration of sealing performance. Will be possible.

According to the invention of claim 6, by urging the ball valve body to one opening side, the ball valve body is held in contact with the O-ring in a no-load state even when the casing is arranged in all directions. Therefore, it becomes easy to exert the check seal function. Therefore, a good check valve function can be exhibited not only when the flow path is provided in the vertical direction but also when the flow path is provided in the horizontal direction or the diagonal direction.

It is a vertical sectional view which shows the embodiment of the simultaneous release valve in this invention. It is an enlarged sectional view of part A in FIG. It is a perspective view of a check valve. It is a central vertical sectional view of a check valve. It is a vertical sectional view which shows the valve open state of the simultaneous release valve of FIG.

Hereinafter, the simultaneous release valve and the check valve structure in the present invention will be described in detail based on the embodiments.
FIG. 1 is a vertical sectional view of an embodiment of the simultaneous release valve of the present invention, and FIG. 2 is an enlarged sectional view of part A in FIG. FIG. 3 shows a perspective view of the check valve.

The simultaneous release valve (hereinafter referred to as valve body 1) shown in the figure is installed in fire extinguishing equipment such as sprinkler equipment and foam fire extinguishing equipment (not shown), and is always closed as a water supply source valve, and is automatically closed in the event of a fire. It is provided to operate as an open valve for simultaneously discharging water from the sprinkler head by control. The valve body 1 has an automatic type that works with a fire alarm and an artificial manual type. In this embodiment, an automatic type that automatically operates by a pressure signal due to decompression of a sensing line, a so-called decompression type. The case of is described.

In FIG. 1, the valve body 1 in the present invention has a body 2, a piston-shaped main valve body 3, a check valve 4, a seat ring 5, a cylindrical holder 6, and a butterfly valve 7.

The body 2 is formed in a hollow shape having a partition wall 2a inside by casting, and the partition wall 2a is perforated with a communication hole 10. The inside of the body 2 is divided into a primary side flow path 11 and a secondary side flow path 12 by the partition wall 2a, and the primary side flow path 11 and the secondary side flow path 12 are communicated with each other by a communication hole 10. There is. A valve seat surface 13 for mounting the seat ring 5 is provided on the outer peripheral edge of the upper surface of the communication hole 10.

In the body 2, a cylindrical hole-shaped pressure control chamber 14 for pressure control is provided on the upper side of the back surface of the main valve body 3 with respect to the primary side, and the diameter of the pressure control chamber 14 is enlarged. The locking step portion 15 of the above is formed. A cylindrical holding body 6 is mounted on the pressure control chamber 14, and a main valve body 3 is inserted into the inner peripheral side of the cylindrical holding body 6 in a state where it can move up and down. The main valve body 3 defines the primary side flow path 11, the secondary side flow path 12, and the pressure control chamber 14.

Piping flanges 16 and 16 are provided on both ends of the body 2, and external primary side piping and secondary side piping (not shown) are connected to the primary side flow path 11 and the secondary side flow path 12 via the piping flange 16. Each is connected. Although not shown, the primary side pipe is connected to a digestive liquid source, for example, a digestive liquid tank or a water storage tank, and a fire extinguishing agent (fluid) can be supplied to the simultaneous release valve side from this fire extinguishing liquid source. On the other hand, a sprinkler head and a foam head are provided on the secondary side piping.

A sensing line 21 which is an external flow path is connected to the pressure control chamber 14 via a lid 20 described later, and a sensing head (not shown) is provided in the sensing line 21, and a fire is detected through the sensing head. It is provided as possible.

An opening 22 is provided in the vicinity of the locking step portion 15 of the pressure control chamber 14, and a lid 20 for closing the pressure control chamber 14 is fitted into the opening 22. Inside the lid 20, a connection flow path 23 for connecting to the sensing line 21 is formed.

The pressure control chamber 14 is provided so as to change the pressure by detecting a fire of the sensing head by communicating with the sensing line 21 via the connecting flow path 23, and the main valve body 3 moves up and down in response to the pressure change. Then, the communication hole 10 is opened and closed by the contact and separation of the main valve body 3 from the seat ring 5, and the valve opens or closes between the primary side flow path 11 and the secondary side flow path 12. It has become like.

The main valve body 3 is formed in a substantially cylindrical shape with a bottom, and is mounted inside the cylindrical holding body 6 so as to be able to move up and down via a sealing O-ring 24. In this case, the main valve body 3 is attached to the lid body 20 so as to be elastically urged toward the valve seat surface 13 by the compression spring 25, and is normally lowered with respect to the body 2 to be in the valve closed state. It is provided. At that time, the bottom surface 3a of the main valve body 3 abuts and seals the seat ring 5.

The main valve body 3 is provided with an internal flow path 30 that communicates the primary side flow path 11 and the pressure control chamber 12, and a storage chamber 31 is formed in a part of the internal flow path 30. The accommodation chamber 31 in this example is provided on the pressure control chamber 12 side of the internal flow path 30, is formed near the center of the upper surface of the main valve body 3, and the bottom surface 31a is on the boundary side of the accommodation chamber 31 with the internal flow path 30. Is provided, and an opening edge portion 32 is formed on the bottom surface 31a.

A check valve 4 incorporated in the cartridge integrated structure is detachably attached to the storage chamber 31, and the check valve 4 allows only fluid to flow from the primary side flow path 11 into the pressure control chamber 14. .. By providing the accommodation chamber 31 near the center of the upper surface of the main valve body 3, processing into the main valve body 3 becomes easy. However, as long as the same function is performed, the accommodation chamber 31 may be provided at a position in the middle of the internal flow path 30, and is not near the center of the upper surface of the main valve body 3, but from the center to the outer peripheral side. It may be provided at a shifted position.

In FIGS. 2 to 4, the check valve 4 has a substantially cylindrical casing 40 having openings at both ends, a ball valve body 41, an O-ring 42, and a spring 43, and is in a state where these are combined. It is attached to the containment chamber 31.

A flow path 44 is formed through the inside of the casing 40, and the ball valve body 41 is housed in the flow path 44 in a state where it can move up and down. The ball valve body 41 is housed in a portion of the casing 40 on the primary side opening 40a side in the flow path 44, and the primary side opening 40a is an inlet side flow path located on the inlet side of the casing 40. It is provided so as to face a certain internal flow path 30 and connect to the internal flow path 30. The inner diameter of the portion of the flow path 44 in which the ball valve body 41 is housed is slightly larger than the diameter of the ball valve body 41. As a result, dust clogging or the like does not occur in the portion where the ball valve body 41 is housed. A mounting groove 45 is formed on the lower inner circumference near the primary side opening 40a of the casing 40, and a plurality of notches 46 are formed in the mounting groove 45 toward the outer peripheral side.

The O-ring 42 is fitted into the mounting groove 45 with the ball valve body 41 housed in the casing 40, whereby the check valve having a cartridge-integrated structure is prevented from falling off from the primary side opening 40a of the ball valve body 41. 4 is configured. By holding the O-ring 42 in the mounting groove 45 in this way, the ball valve body 41 can be prevented from falling even in the state of the check valve 4 alone. The O-ring 42 can be removed by pulling it out from the outside of the casing 40 with a pin-shaped jig (not shown) through the notch 46. Although the notches 46 are provided at three positions with respect to the casing 40 in this example, they can be provided at any number.

A spring 43 made of a coil spring is mounted between the ball valve body 41 inside the casing 40. The spring 43 is attached so as to fit in a portion of the flow path 44 that is smaller in diameter than the portion in which the ball valve body 41 is housed. The ball valve body 41 is urged toward the primary side opening 40a side of the casing 40 by the elastic force of the spring 43, and a force in the direction of seating on the O-ring 42 is constantly applied to the ball valve body 41. ..

FIG. 4A shows a central vertical sectional view of the check valve 4, and FIG. 4B shows a central vertical sectional view of FIG. 4A. As shown in the figure, a plurality of gangways 47 are formed in communication with the flow path 44 on the outer peripheral side of the flow path 44 in the casing 40. When the internal flow path 30 and the pressure control chamber 14 communicate with each other when the valve is opened, the flow rate from the primary side flow path 11 to the pressure control chamber 14 is secured by communicating with the through-passage 47 at the same time.

A male screw portion 50 is formed on the outer periphery of the casing 40, while a female screw portion 51 screwed with the male screw portion 50 is formed at the position of the accommodation chamber 31. A hexagonal hole 48 is formed on the upper surface side of the casing 40, and the casing 40 can be tightened through the hexagonal hole 48 with a hexagon wrench (not shown), and the male screw portion 50 and the female screw portion 51 are screwed together. It is fixed in a predetermined position in the casing 31.

By adjusting the tightening of the casing 40, an appropriate amount of crushing of the O-ring 42 can be obtained. The suitable crushing amount of the O-ring 42 is not particularly limited, but if it is in the range of 10 to 15%, a good sealing force can be obtained when operating as the check valve 4. The casing 40 may be tightened appropriately while observing the amount of crushing of the O-ring 42. For example, by adjusting the depth of the mounting groove 45 of the casing 40, it is possible to obtain a suitable crushing amount of the O-ring 42 when the tip of the casing 40 hits the bottom surface 31a of the storage chamber 31. .. By doing so, it becomes easy to grasp the required tightening amount of the casing 40, and a constant crushing amount of the O-ring 42 can be obtained.

After tightening the casing 40 (check valve 4), the check valve 4 is housed in the storage chamber 31 so that the O-ring 42 comes into contact with the inner wall surface 31b of the storage chamber 31, and the O-ring 42 and the casing 40 The boundary portion with the inner wall surface 31b is sealed.
Further, the ball valve body 41 housed in the check valve 4 is provided so as to be in contact with the opening edge portion 32 when the valve is closed.

By providing the ball valve body 41 so as to come into contact with the opening edge portion 32 when the valve is closed, the ball valve body 41 is brought closer to the primary side opening 40a side as much as possible in the casing 40. As a result, the height of the check valve 4 having the cartridge integrated structure can be minimized, and the diameter of the opening edge portion 32 can be increased with respect to the size of the ball valve body 41 to secure a large flow rate. Easy to do. Further, even when the pressure (reverse pressure) from the pressure control chamber 14 is excessively applied to the ball valve body 41, the opening edge portion 32 functions as a stopper, so that the O-ring 42 is excessively crushed. It is possible to prevent the deterioration of the O-ring 42.

In FIG. 1, the seat ring 5 is provided by covering a core metal 52 formed of a steel material or the like in an annular shape with a soft material 53 made of a rubber material. The seat ring 5 is arranged on the valve seat surface side of the body 2, and is mounted at a predetermined position in the body 2 by the cylindrical holder 6.

The cylindrical holder 6 has a cylindrical cylindrical portion 55 and a leg portion 56 hanging from the cylindrical portion 55. The cylindrical portion 55 is provided with an inner diameter of a size that fits inside the pressure control chamber 14, and an annular flange portion 57 that locks to the locking step portion 15 is formed at the upper end of the cylindrical portion 55. The leg portions 56 are formed at three positions, and are provided so that fluid can pass between the leg portions 56 when the valve is opened. A notch-shaped engaging step portion 58 is formed at the lower end of the leg portion 56, and the cylindrical holder 6 is inserted from the opening 22 side in a state where the outer peripheral side of the seat ring 5 is fitted into the engaging step portion 58. It is inserted into the pressure control chamber 14. At this time, the cylindrical holder 6 is positioned in the height direction by locking the annular flange portion 57 to the locking step portion 15, and the seat ring 5 is mounted on the valve seat surface 13 at a predetermined pressure.

According to the structure described above, when the primary side flow path 11 is in the open state when the valve of the main valve body 3 is closed, a fluid may flow into the check valve 4 from the primary side flow path 11 via the internal flow path 30. The fluid pressure causes the ball valve body 41 to rise in the flow path 44 in a direction away from the O-ring 42, and the check valve 4 is in a valve open state. As a result, the fluid flows from the primary side flow path 11 through the check valve 4 into the pressure control chamber 14, and the pressure control chamber 14 is filled with the fluid.

On the other hand, the ball valve body 41 is subjected to a force in the direction of seating on the O-ring 42 due to its own weight and the elastic force of the spring 43, so that the ball is not applied from the primary side flow path 11 side when the fluid pressure is not applied. The valve body 41 comes into contact with the O-ring 42, which constitutes the seal portion 52. In this way, the valve closed state is maintained, and the passage (backflow) of the fluid from the pressure control chamber 14 to the primary side flow path 11 is blocked.

In FIGS. 1 and 5, the butterfly valve 7 is provided near the piping flange 16 of the primary side flow path 11 and the secondary side flow path 12 as an opening valve to the body 2 side. The butterfly valve 7 has an operating stem 60 and a disc 61 connected to the stem 60, and by rotating the stem 60, the primary side flow path 11 and the secondary side flow path 12 are respectively connected via the disc 61. It can be opened and closed. When the butterfly valve 6 is appropriately opened and closed according to an operation test of the valve body 1 to make the valve body 1 operable, both the primary and secondary butterfly valves 7 and 7 are opened. It may be in a state.

In the above embodiment, the case where the check valve 4 is provided in the simultaneous release valve (valve body 1) has been described, but the check valve described above is used for a valve other than the simultaneous release valve, a piping member such as a pipe, or various piping devices. A structure can also be provided.

In either case, as in the case described above, the check valve has a structure in which the check valve is detachably attached to the storage chamber provided in the internal flow path of the predetermined body, and this check valve is a substantially cylindrical body having openings at both ends. With the ball valve body housed in the shaped casing, an O-ring is mounted near one opening of the casing, and this O-ring prevents the ball valve body from falling off from one opening. It is configured with a cartridge integrated structure.
At this time, the check valve may be housed in the storage chamber so that the O-ring abuts on the inner wall surface of the storage chamber, and the boundary portion between the casing and the inner wall surface may be sealed by the O-ring.

Further, as in the above embodiment, a spring made of a coil spring is mounted between the ball valve body inside the casing and the ball valve body is urged to one opening side by the elastic force of the spring. It may be.

When constructing the check valve structure, it is not always necessary to arrange the casing 40 so that the primary side opening 40a faces downward as shown in FIG. 1, and the spring 43 repels the ball valve body 41 in the valve closing direction. A check valve structure in any direction can be provided as long as the structure is such that the O-ring 42 prevents the ball valve body 41 from falling off when urged. That is, the above-mentioned "fall of the ball valve body" describes the case where the primary side flow path 11 and the secondary side flow path 12 are simultaneous release valves in the horizontal direction, and the drop direction of the ball valve body 41 is , It is not limited to the falling direction. This makes it possible to attach piping members such as valves and pipes provided with a check valve structure and various piping devices in various directions such as vertical piping, horizontal piping, and diagonal piping.

Further, the spring 43 may be other than the coil spring, and various types of springs can be used. Further, as long as the ball valve body 41 can be urged in the valve closing direction of the check valve 4, the urging means is not limited to the spring, and various modes can be used.

Subsequently, the operation of the valve body 1 described above will be described.
In FIG. 1, normally, the primary and secondary side butterfly valves 7 are in a valve open state, and the primary side flow path 11 and the primary side pipe, and the secondary side flow path 12 and the secondary side pipe are in communication with each other. is there.
The main valve body 3 is urged toward the seat ring 5 by the elastic force of the compression spring 25, and both sides of the seat ring 5 are in close contact with the main valve body bottom surface 3a and the valve seat surface 13, respectively, to maintain the sealing property. .. As a result, the main valve body 3 shuts off the primary side flow path 11 and the secondary side flow path 12, and the valve closed state is maintained.

In this state, when a fluid is supplied from the primary side pipe to the primary side flow path 11, the fluid presses the ball valve body 41 which has been sealed with the O-ring 42 until then, and the ball valve body 41 rises. It flows into the pressure control chamber 14 from the internal flow path 30 while allowing the flow. As a result, the pressure control chamber 14 is filled with the fluid, and further, the fluid flows into the path from the pressure control chamber 14 to the sensing head via the sensing line 21, and these are also filled with the fluid to be ready to detect a fire. It becomes a state.

When the sensing head detects a fire and water is discharged, the fluid filled in the pressure control chamber 14 via the sensing line 21 decreases, so that the pressure in the pressure control chamber 14 decreases. As a result, the water pressure in the primary side flow path 11 exceeds the pressure in the pressure control chamber 14 and the force due to the elastic force of the compression spring 25, and due to these pressure differences, the main valve body is shown in FIG. 3 is pushed upward. Therefore, the fluid flows from the flow path between the main valve body 3 and the seat ring 5 from the primary side flow path 11 to the secondary side flow path 12, and the fluid flows from the secondary side flow path 12 to the secondary side piping. Water for fire extinguishing is discharged from the sprinkler head and foam head that are supplied and connected to the secondary side piping.

Next, the operation of the simultaneous release valve and the check valve structure of the present invention in the above embodiment will be described.
In FIG. 1, a check valve 4 incorporated in a cartridge integrated structure is attached to an internal flow path 30 that communicates the primary side flow path 11 of the main valve body 3 and the pressure control chamber 14, and the check valve 4 causes a primary side flow. Since the configuration is such that only the inflow of fluid from the passage 11 into the pressure control chamber 14 is provided, the unitized check valve 4 can be integrally mounted on the main valve body 3. Moreover, the check valve 4 can be easily installed in a short time without any trouble by simply screwing the check valve 4 into the main valve body 3. Since the check valve 4 is detachably provided, it can be easily removed from the main valve body 3 for maintenance and replacement.

High assembly accuracy can be ensured by incorporating the casing 40, the ball valve body 41, the O-ring 42, and the spring 43 to form the check valve 4 having an integrated cartridge structure, and the ball valve body 41 and the O-ring 42 are sealed. It keeps the contact at the time constant and exhibits a stable check seal function. In this case, the check valve 4 is housed in the storage chamber 31 so that the O-ring 42 is in contact with the inner wall surface 31b of the storage chamber 31, and the boundary portion between the casing 40 and the inner wall surface 31b is sealed by the O-ring 42. Therefore, the O-ring 42 can be mounted with high accuracy in the positioned state. As a result, it is possible to replenish the pressure control chamber 14 from the primary side flow path 11 while reliably preventing the inflow of the fluid from the pressure control chamber 14 into the primary side flow path 11.

After the check valve 4 is screwed in, the O-ring 42 is pressed against the bottom surface 31a of the accommodating chamber with a constant pressing force to ensure the sealing property between the check valve 4 and the main valve body 3.
Since the ball valve body 41 is in contact with the opening edge 32 of the accommodation chamber 31 when the check valve 4 is closed, the assembly height of the entire check valve 4 is reduced, and the main valve body 3 and the valve are valved. It is possible to prevent the main body 1 from becoming large.

Since the O-ring 42 is mounted by fitting the casing 40 into the mounting groove 45, the O-ring 42 can be attached and detached with one touch, and the check valve 4 can be easily assembled or disassembled.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the description of the embodiments, and is within the scope of the invention described in the claims of the present invention. Therefore, various changes can be made.

1 Valve body 2 Body 3 Main valve body 4 Check valve (cartridge)
11 Primary side flow path 12 Secondary side flow path 14 Pressure control room 30 Internal flow path (inlet side flow path)
31 Storage chamber 31a Bottom surface 31b Inner wall surface 32 Opening edge 40 Casing 40a Primary side opening 41 Ball valve body 42 O-ring 43 Coil spring (spring)
44 Flow path 45 Mounting groove 70 Seal

Claims (6)

In a simultaneous release valve in which a primary side flow path, a secondary side flow path, and a pressure control chamber are partitioned by a main valve body, an internal flow path that communicates the primary side flow path and the pressure control chamber with the main valve body. Is provided, and a check valve incorporated in a cartridge integrated structure that allows only fluid to flow from the primary side flow path into the pressure control chamber is detachably provided in a part of the internal flow path. A simultaneous release valve characterized by this. The check valve is mounted in a storage chamber provided in the internal flow path of the main valve body, and the check valve is in a state where the ball valve body is housed in a substantially cylindrical casing having openings at both ends. The ball valve body is configured to have a cartridge-integrated structure in which the ball valve body is prevented from falling out from the opening by mounting an O-ring in the vicinity of the opening of the check valve. The simultaneous release valve according to claim 1, which is housed in the storage chamber so as to be in contact with the inner wall surface, and the boundary portion between the casing and the inner wall surface is sealed by the O-ring. The simultaneous release valve according to claim 2, wherein the O-ring is fitted in a mounting groove formed on the inner circumference of the casing. The simultaneous release valve according to claim 2 or 3, wherein the ball valve body is urged on the opening side of the casing inside the casing. The check valve has a check valve structure that is detachably mounted in a storage chamber provided in the internal flow path of a predetermined body, and the check valve has a ball valve body in a substantially cylindrical casing having openings at both ends. In the housed state, the O-ring is mounted near one opening of the casing to prevent the ball valve body from falling off from the one opening, and is configured as a cartridge integrated structure. The check valve is housed in the storage chamber so that the O-ring is in contact with the inner wall surface of the storage chamber, and the check valve structure is such that the boundary portion between the casing and the inner wall surface is sealed by the O-ring. .. The check valve structure according to claim 5, wherein the ball valve body is urged to the one opening side inside the casing.

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