JP2016080123A - Relief valve and fire-extinguishing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relief valve in which a guide member is easily removed from a casing and a fire-extinguishing apparatus having the relief valve installed therein.SOLUTION: A relief valve 1 comprises a cylindrical casing 30 engaged in thread with a pipe at a threaded part 30a where fluid flows and having a valve seat 33 therein; a cylindrical guide member 40 inserted into the casing 30; a spring 50 contacted with an end surface 42a of the guide member 40 at its one end; a valve body 62 inserted into the casing 30 and biased to be contacted with the other end of the spring 50 and contacted with the valve seat 33; and a valve body unit 60 having a shaft part 61 having a smaller diameter than that of the valve body 62 and inserted into the guide member 40. The guide member 40 comprises a contact part 43 contacted with an inner peripheral surface 30b of the casing 30 at an outer peripheral surface 43a, and a stepped part 44 having a smaller diameter than that of the contact part 43 and spaced apart from the inner peripheral surface 30b of the casing 30.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a relief valve for adjusting a pressure in a pipe and a fire extinguishing equipment including the relief valve.

  Conventionally, a relief valve is known that discharges fluid flowing in a pipe when the pressure in the pipe exceeds a predetermined value and suppresses an increase in pressure in the pipe. In Patent Document 1, a valve body biased by a spring is inserted into a guide tube portion (guide member) inserted into a cylindrical body (housing), and the pressure in the pipe exceeds a predetermined value. A relief valve is disclosed in which a valve body moves along a guide member to allow fluid to flow into the housing. In Patent Document 1, the entire outer peripheral surface of a portion of the guide member excluding the portion holding the spring is in contact with the inner peripheral surface of the housing.

Japanese Patent No. 4293371 (Claim 1, FIG. 1)

  The guide member inserted into the inside of the housing receives an external force from the outer peripheral surface of the housing and receives a force from the housing when the housing is deformed. Here, in the relief valve disclosed in Patent Document 1, the entire outer peripheral surface of the portion excluding the portion holding the spring in the guide member is in contact with the inner peripheral surface of the housing. For this reason, in the guide member, if the housing is deformed even a little, the area receiving the force from the housing is large. Then, a large fixing force is generated between the guide member and the housing, and the guide member is difficult to be detached from the housing.

  The present invention has been made against the background of the above problems, and provides a relief valve and a fire extinguishing facility including the relief valve, in which it is easy to remove the guide member from the housing.

  A relief valve according to the present invention includes a cylindrical casing that is screwed into a pipe through which a fluid flows in a threaded portion and has a valve seat therein, and a cylindrical guide member that is inserted into the casing. A spring whose one end is in contact with the end face of the guide member, a valve body which is inserted into the housing and is urged so as to contact the other end of the spring and contact the valve seat, and a valve body. A valve body unit having a small diameter and having a shaft portion inserted into the guide member, the guide member being in contact with the inner peripheral surface of the housing on the outer peripheral surface, and being narrower than the contact portion. A step portion having a diameter and spaced from the inner peripheral surface of the housing.

  According to the present invention, since the guide member has a step portion that is smaller in diameter than the contact portion and is separated from the inner peripheral surface of the housing, the guide member can be easily detached from the housing.

It is a mimetic diagram showing sprinkler fire extinguishing equipment 2 concerning Embodiment 1 of the present invention. It is a front view which shows the flowing water detection apparatus 3 in Embodiment 1 of this invention. It is a top view which shows the flowing water detection apparatus 3 in Embodiment 1 of this invention. It is a side view which shows the flowing water detection apparatus 3 in Embodiment 1 of this invention. It is operation | movement explanatory drawing which shows operation | movement of the flowing water detection apparatus 3 in Embodiment 1 of this invention. It is operation | movement explanatory drawing which shows operation | movement of the flowing water detection apparatus 3 in Embodiment 1 of this invention. It is front sectional drawing which shows the relief valve 1 which concerns on Embodiment 1 of this invention. It is a top view which shows the relief valve 1 which concerns on Embodiment 1 of this invention. It is front sectional drawing which shows the guide member 40 in Embodiment 1 of this invention. It is a top view which shows the guide member 40 in Embodiment 1 of this invention. 6 is a front sectional view showing a relief valve 100 according to Comparative Example 1. FIG. 6 is a bottom view showing a relief valve 100 according to Comparative Example 1. FIG. 6 is a front sectional view showing a guide member 140 in Comparative Example 1. FIG. 6 is a top view showing a guide member 140 in Comparative Example 1. FIG. It is front sectional drawing which shows the relief valve 200 which concerns on Embodiment 2 of this invention. It is a bottom view which shows the relief valve 200 which concerns on Embodiment 2 of this invention. It is a top view which shows the relief valve 200 which concerns on Embodiment 2 of this invention. It is operation | movement explanatory drawing which shows operation | movement of the pressure switch type flowing water detection apparatus 300 of this invention. It is operation | movement explanatory drawing which shows operation | movement of the pressure switch type flowing water detection apparatus 300 of this invention.

  Hereinafter, embodiments of a relief valve and a sprinkler fire extinguishing facility according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a sprinkler fire extinguishing facility 2 as an example of a fire extinguishing facility according to Embodiment 1 of the present invention. The sprinkler fire extinguishing equipment 2 will be described with reference to FIG. In the present embodiment, the fire extinguishing equipment is described as the sprinkler fire extinguishing equipment 2. However, the present invention is not limited thereto, and the present invention can be applied to a foam fire extinguishing equipment that discharges a foam aqueous solution in which a foam fire extinguishing agent and water are mixed. is there.

  As shown in FIG. 1, the sprinkler fire extinguishing equipment 2 includes a first conduit 4, a plurality of second conduits 7, and a plurality of water flow detection devices 3. The flowing water flowing through the flowing water detection device 3 is fire extinguishing water. Here, the fire-extinguishing water may be not only water but also an aqueous solution in which the fire-extinguishing agent is dissolved, and the fire-extinguishing agent may be a foam extinguishing agent. Further, in the description of the first embodiment, the fire water detection apparatus 3 is described as flowing fire extinguishing water. However, the present invention is not limited to this, and anything that flows through the water flow detection apparatus 3 may be any fluid.

  The first conduit 4 is provided on the primary side of the flowing water detection device 3. The first conduit 4 is provided with a water storage tank 6 for storing fire-extinguishing water, and a pump 5 that draws fire-extinguishing water from the water storage tank 6 and supplies the fire-extinguishing water to the water flow detector 3. The water tank 6 may be a water tank. The second conduit 7 is provided on the secondary side of the flowing water detection device 3. The second conduit 7 is provided with a plurality of sprinkler heads 8 as an example of fire extinguishing heads that spray fire extinguishing water. The first conduit 4 and the second conduit 7 are filled with fire-extinguishing water under pressure. Then, when the sprinkler head 8 is actuated to spread the fire-extinguishing water and the pressure of the second conduit 7 decreases, the flowing water detection device 3 distributes the fire-extinguishing water from the first conduit 4 to the second conduit 7. Detecting that fire-fighting water has been distributed. When the flowing water detection device 3 detects that the fire-extinguishing water has circulated, it outputs a fire signal to a fire receiver (not shown). When a fire receiver (not shown) receives the fire signal output from the flowing water detection device 3, the fire receiver sounds a fire alarm to notify the fire. On the other hand, when a pressure drop for pump activation (not shown) detects a pressure drop in the first conduit 4, the pump 5 is activated. In addition, when the flowing water detection device 3 detects the flow of the fire-extinguishing water, a pump activation signal may be output to the pump 5 so that the pump 5 is activated.

  In the relief valve 1, the first conduit 4 and the second conduit 7 are connected by bypass without using the flowing water detection device 3, and the pressure in the second conduit 7 is more constant than the set pressure. Release when the value is higher than the value. As a result, the relief valve 1 releases the pressure in the pipe from the second conduit 7 to the first conduit 4. When the relief valve 1 is not used, if the pressure in the second conduit 7 increases due to an increase in the ambient temperature, there is a risk that problems such as damage to the sprinkler head 8 and the like may occur. For this reason, it is set so that the pressure is relieved in the first conduit 4 having a pipe volume more than that of the second conduit 7.

  Here, when the sprinkler fire extinguishing equipment 2 is initially provided, the second conduit 7 that is the secondary side of the flowing water detection device 3 and the first conduit 4 that is the primary side of the flowing water detection device 3 have substantially the same water pressure. ing. After the installation of the sprinkler fire extinguishing equipment 2, the volume of the fire extinguishing water in the second conduit 7 is reduced due to the temperature drop, and the fire extinguishing water is supplied from the first conduit 4. Thereafter, when the temperature returns, the volume of the second conduit 7 returns to a higher pressure than the first conduit 4. The relief valve 1 is opened when the pressure in the second conduit 7 becomes higher than the pressure in the first conduit 4 by a certain value or more, so that the pressure on the secondary side (second conduit 7) of the flowing water detector 3 is increased. It becomes higher than the pressure on the primary side (first conduit 4).

  In such a state, there are effects as described later. For example, when fire water is sprayed from the sprinkler head 8 on the first floor and the pressure in the second conduit 7 on the first floor decreases, the fire water passes through the water flow detection device 3 on the first floor and passes through the first conduit 4. To the second conduit 7 on the first floor. First, a case where the pressure is set lower than the shutoff pressure of the pump 5 provided in the first conduit 4 will be described. For example, the pressure of the second conduit 7 is set to 1.0 Mpa, and the cutoff pressure of the pump 5 is set to 1.2 Mpa. When fire water is sprayed from the sprinkler head 8 on the first floor, the pressure in the second conduit 7 on the first floor decreases, and the pump 5 operates at a cutoff pressure of 1.2 Mpa. However, the pressure of the second conduit 7 on the floor other than the first floor is 1.0 Mpa. For this reason, the pump 5 will supply fire-extinguishing water to the 2nd conduit | pipe 7 of floors other than the 1st floor until the pressure in the 2nd conduit | pipe 7 of floors other than the 1st floor rises to 1.2 Mpa. Therefore, it takes time until fire extinguishing water is supplied to the second conduit 7 on the first floor. Moreover, when fire-extinguishing water is supplied to the second conduits 7 on floors other than the first floor, there is a possibility that the running water detection device 3 provided on each floor may detect the running water.

  On the other hand, in the first embodiment, the set pressure of the relief valve 1 is set higher than the cutoff pressure of the pump 5. That is, the pressure on the secondary side of the flowing water detection device 3 is set higher than the pressure on the primary side. For example, when the shutoff pressure of the pump 5 is 1.2 Mpa, the pressure of the relief valve 1 is set to 1.3 Mpa. In this way, when fire water is sprayed from the sprinkler head 8 on the first floor, the pressure in the second conduit 7 on the first floor decreases, and the pump 5 operates so that the cutoff pressure is 1.2 Mpa. . And since the pressure of the 2nd conduit | pipe 7 of floors other than the 1st floor is 1.3 MPa, the pump 5 does not supply fire extinguishing water to the 2nd conduit | pipe 7 of floors other than the 1st floor. For this reason, the pump 5 can supply all the fire-extinguishing water to the second conduit 7 on the first floor. Thus, this Embodiment 1 has the effect that the spraying of the fire-extinguishing water from the sprinkler head 8 on the first floor is appropriately performed. Moreover, it can prevent that the relief valve 1 always opens by carrying out like this.

  FIG. 2 is a front view showing the running water detection device 3 according to the first embodiment of the present invention, FIG. 3 is a top view showing the running water detection device 3 according to the first embodiment of the present invention, and FIG. It is a side view which shows the flowing water detection apparatus 3 in the form 1 of. As shown in FIGS. 2, 3, and 4, the flowing water detection device 3 includes a device main body 10, a drain valve 12, a flowing water detection unit 13, and a bypass unit 14. The apparatus main body 10 connects the first conduit 4 and the second conduit 7 and has a main body valve 11 inside. The main body valve 11 is a check valve, and opens when the pressure in the second conduit 7 becomes lower than the pressure in the first conduit 4, and the fire-extinguishing water flows from the first conduit 4 to the second conduit 7. It is allowed to do.

  The drain valve 12 discharges the fire-extinguishing water in the second conduit 7 when performing maintenance or the like in the second conduit 7 or the sprinkler head 8. The flowing water detection unit 13 detects that fire-extinguishing water has circulated in the apparatus main body 10. 5 and 6 are operation explanatory diagrams showing the operation of the flowing water detection device 3 according to the first embodiment of the present invention. As shown in FIG. 5, when the sprinkler head 8 is in a normal state where it is not operating, the main body valve 11 is closed and fire extinguishing water does not flow through the apparatus main body 10. In addition, the flowing water detection part 13 has the rod-shaped stem 10b in which one end contacts the main body valve 11, and the limit switch 10c which transmits a flowing water signal when pressed by the stem 10b. As shown in FIG. 6, when the pressure in the second conduit 7 decreases and becomes lower than the pressure in the first conduit 4, the main body valve 11 opens and the fire extinguishing water flows through the apparatus main body 10. When the body valve 11 is opened, one end of the stem 10b is pushed up and the other end of the stem 10b is lowered. Accordingly, the limit switch 10c is pressed by the other end of the stem 10b. Then, a running water signal is transmitted from the limit switch 10c to, for example, a receiver (not shown). As described above, the flowing water detection device 3 according to the first embodiment uses an operating valve type.

  The bypass portion 14 connects the first conduit 4 and the second conduit 7 without the main body valve 11, and includes a primary maintenance valve 15, a secondary maintenance valve 16, and a primary pressure gauge 17. The secondary pressure gauge 18, the first pipe 19, the second pipe 20, and the relief valve 1 are provided. The first piping 19 is provided on the first conduit 4 side from the relief valve 1 in the bypass portion 14, and the primary maintenance valve 15 is provided on the first piping 19. The second pipe 20 is provided on the second conduit 7 side of the relief valve 1 in the bypass portion 14, and the secondary maintenance valve 16 is provided on the second pipe 20. The primary maintenance valve 15 and the secondary maintenance valve 16 are normally opened and are closed when maintaining the relief valve 1, the primary pressure gauge 17, the secondary pressure gauge 18, and the like included in the bypass section 14. This is for stopping the conduction of the fire-extinguishing water between the first conduit 4 and the second conduit 7 via the.

  The primary pressure gauge 17 is provided in the first pipe 19 and measures the pressure in the first pipe 19. When the primary maintenance valve 15 is open, the pressure in the first pipe 19 is equivalent to the pressure in the first conduit 4. The secondary pressure gauge 18 is provided in the second pipe 20 and measures the pressure in the second pipe 20. When the secondary maintenance valve 16 is open, the pressure in the second pipe 20 is equal to the pressure in the second conduit 7.

  The relief valve 1 connects the first pipe 19 and the second pipe 20, and when the pressure in the second pipe 20, that is, the pressure in the second conduit 7 rises, the second pipe 20 Fire-extinguishing water is circulated through the first pipe 19. The first pipe 19 is provided with an elbow 19a, and the second pipe 20 is provided with a socket 20a, which are connected to the relief valve 1, respectively. FIG. 7 is a front sectional view showing the relief valve 1 according to Embodiment 1 of the present invention, and FIG. 8 is a top view showing the relief valve 1 according to Embodiment 1 of the present invention. As shown in FIGS. 7 and 8, the relief valve 1 includes a housing 30, a guide member 40, a spring 50, a valve body unit 60, and a retaining ring 46.

  The casing 30 has a cylindrical shape, and a so-called (for pipe) taper screw in which a threaded portion 30a is formed on the outer periphery of both end sides so that the threaded portion 30a is tapered so that both ends are thinned. It has become. And the housing | casing 30 is screwed together with the 1st piping 19 in the screw part 30a of the one end side, and is screwing together with the 2nd piping 20 in the screw part 30a of the other end side. In this way, the housing 30 and the first pipe 19 and the second pipe 20 are firmly screwed together by screwing in the threaded threads formed with the taper. Further, a ring-shaped groove into which the retaining ring 46 is fitted is cut in the inner peripheral surface 30 b on one end side of the housing 30. A first space 31 is formed in the housing 30 in the longitudinal direction (arrow Z direction) of the housing 30 from one end side, and the first space 31 is smaller in diameter than the first space 31 on the other end side. Two spaces 32 are formed. A valve seat 33 including a flow path 33 a is provided at the boundary between the first space 31 and the second space 32. In addition, as for the housing | casing 30, the part which covers the 1st space 31 in the one end side is thinner than the part which covers the 2nd space 32 in the other end side.

  FIG. 9 is a front sectional view showing the guide member 40 according to the first embodiment of the present invention, and FIG. 10 is a top view showing the guide member 40 according to the first embodiment of the present invention. As shown in FIGS. 9 and 10, the guide member 40 has a substantially cylindrical shape, is inserted into the inside from one end side of the housing 30, and is accommodated in the first space 31. The guide member 40 includes a bearing portion 41 and a spring receiving portion 42 having a diameter larger than that of the bearing portion 41 and coaxial. The bearing portion 41 is inserted with the valve body unit 60 therein, and is inserted inside the spring 50. One end of the spring 50 is in contact with the end surface 42 a on the bearing portion 41 side, and the spring receiving portion 42 holds the spring 50. A guide hole 45 is formed in the spring receiving portion 42 in the longitudinal direction (arrow Z direction) of the guide member 40, and the guide hole 45 circulates the fire extinguishing water. In addition, although the case where the number of the guide holes 45 is four is illustrated, it may be less than four or more than four.

  The spring receiving part 42 has a contact part 43 and a step part 44. The contact portion 43 is inserted into the housing 30 and comes into contact with the inner peripheral surface 30b of the housing 30 on the outer peripheral surface 43a. The guide member 40 is locked in the housing 30 by the retaining ring 46. Further, as shown in FIG. 7, the contact portion 43 is in contact with the inner peripheral surface 30 b of the housing 30 within a range where the housing 30 and the elbow 19 a of the first pipe 19 are screwed together. The step portion 44 has a smaller diameter than the contact portion 43 and is separated from the inner peripheral surface 30 b of the housing 30. In the spring receiving portion 42, the volume ratio between the contact portion 43 and the step portion 44 can be changed as appropriate. Further, the height of the contact portion 43 is higher than the height of the step portion 44. preferable.

  As shown in FIG. 7, the spring 50 is inserted with the bearing portion 41 of the guide member 40, and one end contacts the end surface 42 a of the spring receiving portion 42 of the guide member 40, and the other end is an end surface 62 a described later. The valve body unit 60 is urged. This spring 50 is also accommodated in the first space 31 of the housing 30.

  As shown in FIG. 7, the valve body unit 60 includes a shaft portion 61 and a valve body 62 having a diameter larger than that of the shaft portion 61 and coaxial, and is accommodated in the first space 31 of the housing 30. ing. The shaft portion 61 is inserted into the bearing portion 41 of the guide member 40. In the valve body 62, the other end of the spring 50 is in contact with the one end surface 62a on the shaft portion 61 side, and is grounded to the valve seat 33 of the housing 30 via the packing 64 while being separated from the guide member 40. The spring 50 is biased. The other end surface 62b of the valve body 62 is grounded to the valve seat 33 of the housing 30 via the packing 64 at the normal time, that is, when the pressure difference between the first conduit 4 and the second conduit 7 is less than a set value. And closes the flow path 33a. Thereby, the fire water is prevented from flowing from the second space 32 to the first space 31. A screw hole 62 c is formed on the other end side of the valve body 62, and a screw 63 is inserted into the screw hole 62 c via a packing 64. The screw 63 is for providing the packing 64 on the valve body 62, but the means for providing the packing 64 on the valve body 62 is not limited to this, and caulking or using an adhesive may be used.

  On the other hand, when an external force is applied to the valve body 62 from the second space 32 side against the urging force of the spring 50, the other end surface 62b (packing 64) of the valve body 62 moves away from the valve seat 33 and flows. The path 33a is opened. As a result, the fire-extinguishing water is allowed to flow from the second space 32 to the first space 31. In this way, the valve body unit 60 normally contacts the valve seat 33 to close the flow path 33a, and repels the biasing force of the spring 50 when a pressure equal to or higher than the set value is applied from the second space 32 side. Then, fire extinguishing water is allowed to flow away from the valve seat 33 to the housing 30.

  The retaining ring 46 is fitted into a ring-shaped groove provided in the inner peripheral surface 30 b of the housing 30 after the guide member 40 is inserted into the housing 30, and the guide member 40 comes out of the housing 30. This is to prevent this.

  Next, the operation of the relief valve 1 according to the first embodiment will be described. In a normal state, the pressure difference in the first conduit 4 and the second conduit 7 is within a predetermined setting range, and the valve body 62 in the valve body unit 60 is biased by the spring 50, and the guide In a state of being separated from the member 40, the valve seat 33 is grounded to block the flow path 33a. For this reason, the fire extinguishing water does not flow from the second pipe 20 connected to the second conduit 7 to the first pipe 19 connected to the first conduit 4.

  On the other hand, when the pressure in the second conduit 7 rises due to a change in the temperature of the outside air, the pressure is applied to the valve body 62 in the valve body unit 60 in a direction repelling the urging force of the spring 50. Thereby, the valve body 62 (packing 64) leaves | separates from the valve seat 33, and opens the flow path 33a. Thereby, the fire extinguishing water reaches the first space 31 from the second pipe 20 connected to the second conduit 7 through the second space 32, and further guide holes 45 in the spring receiving portion 42. Through the first pipe 19 connected to the first conduit 4. As a result, the relief valve 1 lowers the pressure in the second conduit 7 and returns the pressure in the second conduit 7 to the normal state. The biasing force of the spring 50 is set so that the pressure in the second conduit 7 is higher than the pressure in the first conduit 4 in the normal state.

  Next, the operation of the relief valve 1 according to the first embodiment will be described. The guide member 40 in the relief valve 1 has a stepped portion 44 that has a smaller diameter than the contact portion 43 and is separated from the inner peripheral surface 30 b of the housing 30. For this reason, when the guide member 40 is inserted into the housing 30, the area of the guide member 40 that receives a force from the housing 30 is small. Therefore, when the guide member 40 is removed from the housing 30 after the guide member 40 is inserted into the housing 30, the guide member 40 can be easily detached from the housing 30.

  Further, since the area where the guide member 40 receives a force from the housing 30 is small, the housing 30 and the first pipe 19 are screwed together within the range of the spring receiving portion 42 of the guide member 40, and the thin first Even if the portion covering the first space 31 is bent toward the inner peripheral side, it is easy to remove the guide member 40 from the housing 30. Further, since the outer peripheral surface 43a is in contact with the inner peripheral surface 30b of the housing 30 within a range where the housing 30 and the elbow 19a of the first pipe 19 are screwed together, the first space 31 is covered. Even if the portion bends to the inner peripheral side, it is easy to return the first space 31 to its original shape and remove the guide member 40 from the housing 30. Can be thin. Therefore, the relief valve 1 can be reduced in size. Moreover, since the volume ratio of the contact part 43 and the step part 44 can be changed suitably, the existing components can be used as it is, without changing the design of each component which comprises the relief valve 1. FIG. Thus, this Embodiment 1 has high versatility.

  Further, the contact portion 43 in the guide member 40 is in contact with the inner peripheral surface 30b of the housing 30 on the entire circumference. For this reason, when the guide member 40 is inserted into the housing 30, the force that the guide member 40 receives from the housing 30 is uniform in the circumferential direction of the guide member 40. Therefore, when the guide member 40 is removed from the housing 30 after the guide member 40 is inserted into the housing 30, the guide member 40 can be easily detached from the housing 30.

  11 is a front sectional view showing the relief valve 100 according to Comparative Example 1, FIG. 12 is a bottom view showing the relief valve 100 according to Comparative Example 1, and FIG. 13 is a front sectional view showing the guide member 140 in Comparative Example 1. 14 and 14 are top views showing the guide member 140 in the first comparative example. As shown in FIGS. 11, 12, 13, and 14, the guide member 140 in the comparative example 1 includes three convex portions 146 arranged at equal intervals in the circumferential direction, and the inner periphery of the housing 30. It is in contact with the surface 30b. For this reason, when the housing | casing 30 and the 1st piping 19 screw together, the area which the three convex parts 146 and the internal peripheral surface 30b of the housing | casing 30 contact is compared with this Embodiment 1. FIG. Since it is small, the three convex portions 146 may bite into the housing 30. When the three convex portions 146 bite into the housing 30, the guide member 140 is difficult to remove from the housing 30.

Embodiment 2. FIG.
FIG. 15 is a front sectional view showing a relief valve 200 according to Embodiment 2 of the present invention, FIG. 16 is a bottom view showing the relief valve 200 according to Embodiment 2 of the present invention, and FIG. 6 is a top view showing a relief valve 200 according to Embodiment 2. FIG. The second embodiment is different from the first embodiment in that the concave portion 247 is formed in the contact portion 43 of the guide member 240 and the elastic member 248 is inserted into the concave portion 247. In the second embodiment, portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the first embodiment will be mainly described.

  As shown in FIGS. 15, 16, and 17, in the second embodiment, a recess 247 is formed in the contact portion 43 of the guide member 240. A thread is cut on the inner peripheral surface 30 b on one end side of the housing 30, and a thread is also cut on the outer peripheral surface 43 a of the contact portion 43. In this way, the housing 30 and the contact portion 43 are screwed together by the screw threads formed on the housing 30 and the contact portion 43. The guide member 240 is inserted into the housing 30 in a state where the elastic member 248 is inserted into the recess 247. The elastic member 248 may be a resin or a soft metal such as copper. In the second embodiment, when the guide member 240 is inserted into the housing 30, the housing 30 hits the elastic member 248 and is pressed by the elastic member 248. Thereby, when the guide member 240 is completely inserted into the housing 30, the fixing force between the housing 30 and the guide member 240 is increased, and a function of preventing loosening is added. In the second embodiment, similarly to the first embodiment, if an external force is applied to the guide member 240 to remove the guide member 240 from the housing 30, it can be easily removed.

  In addition, the recessed part 247 and the elastic member 248 may be provided with two or more in the contact part 43, and may make the cyclic | annular form formed in the perimeter of the contact part 43. FIG.

  Moreover, in the said embodiment, although the operating valve type flowing water detection apparatus 3 is illustrated, other flowing water detection apparatuses 300, such as a pressure switch type, may be used. 18 and 19 are operation explanatory views showing the operation of the pressure switch type water flow detection device 300 of the present invention. In the case of the pressure switch type water flow detection device 300, as shown in FIG. 18, when the sprinkler head 8 is in a normal state where it is not operating, the main body valve 11 is closed and fire extinguishing water does not flow through the device main body 10. The apparatus main body 10 is formed with a flowing water hole 10a, and a flowing water detection unit 313 that is a pressure switch is provided at the end of the flowing water hole 10a. When the main body valve 11 is closed, the main body valve 11 closes not only the inside of the apparatus main body 10 but also the water flow hole 10a. And as shown in FIG. 19, when the pressure in the 2nd conduit | pipe 7 falls, the main body valve 11 will open and fire extinguishing water will distribute | circulate through the apparatus main body 10. FIG. Along with this, fire extinguishing water also enters the flowing water hole 10a, and the flowing water detecting unit 313 detects the fire extinguishing water that has entered.

  DESCRIPTION OF SYMBOLS 1 Relief valve, 2 sprinkler fire extinguishing equipment, 3 flowing water detection apparatus, 4 1st conduit | pipe, 5 pump, 6 water storage tank, 7 2nd conduit | pipe, 8 sprinkler head, 10 apparatus main body, 10a flowing water hole, 10b stem, 10c limit Switch, 11 Body valve, 12 Drain valve, 13 Flow detection part, 14 Bypass part, 15 Primary maintenance valve, 16 Secondary maintenance valve, 17 Primary pressure gauge, 18 Secondary pressure gauge, 19 First piping, 19a Elbow, 20 second piping, 20a socket, 30 housing, 30a screw part, 30b inner peripheral surface, 31 first space, 32 second space, 33 valve seat, 33a flow path, 40 guide member, 41 bearing part, 42 Spring receiving portion, 42a End surface, 43 Contact portion, 43a Outer peripheral surface, 44 Step portion, 45 Guide hole, 46 Retaining ring, 50 Spring, 6 0 valve body unit, 61 shaft portion, 62 valve body, 62a one end surface, 62b other end surface, 62c screw hole, 63 screw, 64 packing, 100 relief valve, 140 guide member, 146 convex portion, 200 relief valve, 240 guide member 247 recessed part, 248 elastic member, 300 running water detection device, 313 running water detection part.

Claims (5)

A cylindrical housing that is screwed into a pipe through which a fluid flows in the threaded portion and has a valve seat inside;
A cylindrical guide member inserted into the housing;
A spring whose one end contacts the end face of the guide member;
A valve body that is inserted into the housing and is biased so as to contact the other end of the spring and contact the valve seat; and a diameter smaller than the valve body, and the guide member A valve body unit having a shaft portion inserted therein,
The guide member is
A contact portion in contact with the inner peripheral surface of the housing on the outer peripheral surface;
A step portion having a diameter smaller than that of the contact portion and spaced from the inner peripheral surface of the housing;
A relief valve comprising:   The relief valve according to claim 1, wherein the contact portion of the guide member is in contact with an inner peripheral surface of the housing on the entire periphery.   The relief valve according to claim 1, wherein the contact portion of the guide member is in contact with an inner peripheral surface of the casing within a range in which the casing and the pipe are screwed together. A concave portion is formed in the contact portion in the guide member,
The guide member is
The relief valve according to any one of claims 1 to 3, wherein the relief valve is inserted into the housing in a state where an elastic member is inserted into the recess. A flowing water detection device that has the relief valve according to any one of claims 1 to 4 and detects that a fluid circulates;
A first conduit provided with a pump connected to a primary side of the water flow detection device and supplying fluid to the water flow detection device;
A second conduit connected to the secondary side of the water flow detection device and provided with a fire extinguishing head for spraying fluid;
The relief valve is
The fire extinguishing equipment, wherein when the pressure in the second conduit becomes higher than a shutoff pressure of the pump, the pressure is released to release the pressure into the first conduit.

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