KR102585163B1 - Outdoor fire hydrant with improved water flow performance - Google Patents

Abstract

The present invention relates to a ground-type fire hydrant with improved water flow performance. According to the present invention, the lower body 110 of the fire hydrant is in communication with the middle body 121 and directs firefighting water flowing in from the inlet pipe portion 112 to the middle body 121. A body portion 111 in which a sending outflow hole 111a is formed, and an inflow hole 112a, which protrudes outward from the body portion 111 and through which firefighting water flows, is formed to communicate with the outlet hole 111a. It is configured to include a pipe portion 112, and when the valve disks 141 and 142 open the outlet hole 111a according to the descent of the valve shaft 135, fire extinguishing water flows in from the inlet hole 112a of the inlet pipe portion 112. In order to change the flow of water to the outlet hole (111a) and at the same time guide it smoothly, inclined guide surfaces (151a, 152a) formed to slope upward from the outlet side of the inlet hole (112a) toward the entrance of the outlet hole (111a) are introduced. It is characterized in that it further includes guide members 151, 152, and 153 formed toward the pipe portion 112, and this has the advantage of minimizing pressure loss in the lower body and eliminating flow resistance in the lower body.

Description

Outdoor fire hydrant with improved water flow performance}

The present invention relates to an above-ground fire hydrant, and in particular, to an above-ground fire hydrant with improved water flow performance suitable for minimizing pressure loss in the lower body and eliminating passage resistance in the lower body.

Ground-type fire hydrants, also commonly referred to as outdoor fire hydrants, are disaster prevention facilities that supply firefighting water required for fire suppression to urban roadsides or around large buildings. They are durable enough to be maintained, repaired, and used over a long period of time after installation. It is a disaster prevention facility that must be designed, manufactured, and constructed so that it can be used infrequently, but requires high reliability as it must be operational in the event of a fire.

Figure 7 shows a configuration diagram of a ground-type fire hydrant according to the prior art. As shown in FIG. 7, the ground-type fire hydrant 10 according to the prior art installed outdoors includes a tube body 11 having an inlet through which fire-fighting water flows in and an outlet through which fire-fighting water flows out, and the tube body 11 An adjustment nut (12) is rotatably installed on the upper side and rotated in place by a separate handle (not shown), and the rotational movement of the adjustment nut (12) is screwed to the adjustment nut (12) and rotates in place. Therefore, the valve shaft 13 provided inside the pipe body 11 to be raised and lowered in the vertical direction (up and down direction) is fastened to the lower end of the valve shaft 13 to open and close the lower valve inlet of the pipe body 11. The valve disk 14, the ring-shaped seat 16 screwed to the lower valve inlet of the pipe body 11, and the seat are inserted into a guide groove (not shown) formed on the inner peripheral surface of the seat to be raised and lowered along the guide groove. It is configured to include a pair of guide vanes 15 formed on the valve disk 14.

In addition, the valve disk 14 is provided in the lower body 11a at the lower part of the pipe body 11, and protrudes outward from the outer peripheral surface of the lower body 11a to form an inlet pipe portion 11b through which fire-fighting water flows. In addition, a support 17 is provided that protrudes downward from the bottom 11a' of the lower body 11a for standing the fire hydrant 10 on the ground.

In addition, in the ground-type fire hydrant 10 according to the prior art, when a handle (not shown), which is a separate operating mechanism, is inserted into the head of the adjustment nut 12 and the adjustment nut 12 is turned in one direction (for example, to the right), the valve shaft ( 135) rises and the valve disc 14 blocks the valve inlet, so the hydrant is closed. When the control nut 120 is loosened (for example, turned to the left), the valve shaft 135 goes down and opens.

At this time, the guide blade 15 along with the valve disc 14 is raised and lowered along the guide groove (not shown) formed on the inner peripheral surface of the seat, so when the adjustment nut 12 rotates in place, the valve shaft 135 moves in place together. By holding it so that it does not turn, the valve shaft 135 moves up and down smoothly.

However, the ground-type fire hydrant 10 according to the prior art as described above had the following problems.

First, the conventional fire hydrant has a separate stand 17 formed at the bottom of the lower body, so that when the hydrant is opened, as shown in (b) of FIG. 7, the valve disk 14 touches the bottom 11a' of the lower body. Thus, the valve disc 14 is located inside the lower body 11a, and at this time, the valve disc 14 is located on the flow path of firefighting water flowing in and being discharged from the inlet pipe portion 11b.

Therefore, the valve disk 14 acts as a flow resistance that prevents the discharge of fire-fighting water from inside the lower body, and as a result, the pressure loss of fire-fighting water becomes very large. As a result, the firefighting output pressure of the firefighting water was low, leading to a problem of weakened waterproofing performance.

In addition, as described above, in a conventional fire hydrant, the valve disk 14 is located inside the lower body, preventing the discharge of fire-fighting water. To solve this problem, the lower body protrudes convexly in the shape of a jar.

However, when the lower body protrudes convexly like this, a problem of pressure loss occurs due to the membranous phenomenon (membrane is indicated by an arrow in (b) of Figure 7).

In addition, in the case of the prior art, as shown in FIG. 7, guide wings 15 are formed on the valve disc 14 to prevent the valve shaft 13 from turning, so that the water input from the inlet flows into the pipe. This further hinders the flow of water, resulting in a greater pressure loss of water. As a result, the firefighting output pressure of the firefighting water was low, leading to a problem of weakened waterproofing performance.

Document 1: Registered Patent Publication No. 10-1167608 (Publication date: 2012.07.27) Document 2: Public Patent Publication No. 10-2013-0016486 (Publication date: 2013.02.18)

The present invention was created to solve the problems of the prior art as described above. The purpose of the above-ground fire hydrant with improved water flow performance according to the present invention is to:

First, the firefighting water flowing in from the outflow hole of the lower body can be smoothly guided to change the direction of the water flow to the outflow hole of the lower body without causing a membrane phenomenon, thereby minimizing the pressure loss in the lower body,

Second, by forming the body part of the lower body in a straight line, the occurrence of membranous flow can be blocked at the source, thereby eliminating the pressure loss caused by membranous flow,

Third, when opening the fire hydrant, the valve disc is inserted into the disc receiving groove so that it is not on the lower body flow path of fire-fighting water from the inlet hole to the outlet hole, so that the valve disc does not interfere with the outflow of fire-fighting water.

Fourth, the water flow performance of ground-type fire hydrants is improved by eliminating obstructions to the flow path caused by the valve disc.

Fifth, it allows the firefighting water flowing in from the inlet hole to be guided to the outflow hole more gently and smoothly.

Sixth, to provide an above-ground fire hydrant with improved water flow performance suitable for reducing the molding time and man-hours of the lower body, thereby reducing the overall molding cost of the lower body.

The present inventor's ground-type fire hydrant with improved water flow performance to achieve the above object includes a pipe body having an inlet hole through which fire-fighting water supplied from a fire-fighting water supply source flows and an outlet through which fire-fighting water flowing into the inlet hole is discharged to the outside. , an adjustment nut that is rotatably installed on the upper side of the pipe body and rotates in place, and a valve shaft provided in the pipe body to rise and fall in the vertical direction according to the rotational motion of the adjustment nut that is screwed to the adjustment nut and rotates in place, In the above-ground fire hydrant, which is provided at the lower end of the valve shaft and includes a valve disk that opens and closes the pipe body, the pipe body is formed with the inlet hole through which fire-fighting water supplied from a fire-fighting water supply source flows, and the valve disk is positioned. A lower body, a middle body that communicates with the lower body and fastened to the top of the lower body, and an upper body that communicates with the middle body and is fastened to the top of the middle body, has the outlet through which fire-fighting water is discharged to the outside, and is provided with the adjustment nut. It is composed of a body portion, the upper end of which is fastened to the lower end of the middle body, and a body portion formed with an outlet hole that communicates with the middle body and sends firefighting water flowing in from the inlet pipe portion to the middle body, and protrudes outward from the body portion. It is formed and is configured to include an inlet pipe portion formed so that an inlet hole through which fire-fighting water flows is in communication with the outlet hole, and the valve disc opens or closes the outlet hole of the body portion according to the elevation of the valve shaft to open or close the fire hydrant. In addition, when the valve disc opens the outlet hole according to the lowering of the valve shaft, the fire extinguishing water flowing in from the inlet hole of the inlet pipe portion is changed to the outlet hole and at the same time is smoothly guided to the inlet hole. It is characterized in that the inclined guide surface formed to be inclined upward from the outlet side toward the inlet of the outflow hole further includes a guide member formed toward the inlet pipe portion.

The above-ground fire hydrant with improved water flow performance according to the present invention having the above configuration has the following effects.

First, there is an effect that the firefighting water flowing in from the outflow hole of the lower body can smoothly guide the change of direction of the water flow to the outflow hole of the lower body without causing a membranous phenomenon. It also has the effect of minimizing pressure loss in the lower body.

Second, by forming the body part of the lower body in a straight line, there is an effect of fundamentally blocking the occurrence of membranous flow, and as a result, there is an effect of eliminating pressure loss caused by membranous flow.

Third, by having the valve disc inserted into the disc receiving groove when the fire hydrant is opened, there is an effect of not being on the lower body passage of fire-fighting water from the inlet hole to the outlet hole, and as a result, the valve disc does not interfere with the outflow of fire-fighting water. It has the effect of not doing so.

Fourth, the waterproofing performance of the above-ground fire hydrant can be improved by eliminating the flow path obstruction caused by the valve disk.

Fifth, it has the effect of guiding the firefighting water flowing in from the inlet hole to the outflow hole more gently and smoothly.

Sixth, there is an effect of reducing the overall molding cost of the lower body by reducing the molding time and man-hours of the lower body.

Figure 1 shows a ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention.
Figure 1 is a configuration diagram of a ground-type fire hydrant 100 with improved water flow performance according to an embodiment of the present invention in a closed state.
Figure 2 is a configuration diagram of the above-ground fire hydrant 100 with improved water flow performance according to an embodiment of the present invention, with the valve shaft 135 lowered and open.
Figure 3 is a cross-sectional view of the guide member 151 in Figures 1 and 2.
Figure 4(a) is a front view of the guide members 151 and 152 in the ground-type fire hydrant 100 with improved water flow performance according to an embodiment of the present invention, and Figure 4(a) is a front view of the guide members 151 and 152 according to an embodiment of the present invention. This is a plan view of the guide members 151 and 152 in the ground-type fire hydrant 100 with improved water flow performance.
Figure 5 is an external view of the guide member 152 according to another embodiment in the ground-type fire hydrant 100 with improved water flow performance according to an embodiment of the present invention. Figure 5 (a) shows the guide member 152 is a front perspective view, Figure 5 (b) is a rear perspective view of the guide member 152, and Figure 5 (a) is a side view of the guide member 152.
Figure 6 is a conceptual diagram of the main parts of an above-ground fire hydrant 100 with improved water flow performance according to another embodiment of the present invention. Figure 6 (a) is a conceptual diagram in an open state, and Figure 6 (b) is a closed state. This is a conceptual diagram of the composition.
Figure 7 is a configuration diagram of a ground-type fire hydrant according to the prior art. Figure 7 (a) is a configuration diagram in a closed state, and Figure 7 (b) is a configuration diagram in an open state.

Next, a preferred embodiment of the present inventor's ground-type fire hydrant with improved water flow performance will be described in detail with reference to the attached drawings.

The ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention has an inlet hole (112a) through which fire-fighting water supplied from a fire-fighting water supply source flows and an outlet through which fire-fighting water flowing into the inlet hole (112a) is discharged to the outside ( 122a) is formed on the tube body (110, 121, 122), an adjustment nut (131) rotatably installed on the upper side of the tube body and turned in place by a separate mechanism (e.g. a handle (not shown)), and the adjustment nut ( 131) and a valve shaft 135 provided on the pipe bodies 110, 121, 122 to be raised and lowered in the vertical direction (up and down) according to the rotational motion of the adjustment nut 131 that rotates in place, and the valve shaft 135 In an above-ground fire hydrant comprised of valve disks 141 and 142 provided at the bottom to open and close the pipe bodies 110, 121 and 122, the pipe bodies 110, 121 and 122 have the inlet hole 112a through which fire-fighting water supplied from a fire-fighting water supply source flows. ) is formed and the valve disk 141 is located on the lower body 110, the middle body 121 in communication with the lower body 110 and fastened to the upper end of the lower body, and the middle body 121 in communication with the middle body 121 ) and is formed with an outlet (122a) through which fire-fighting water is discharged to the outside, and is composed of an upper body (122) provided with the adjustment nut (131), and the lower body (110) has an upper end connected to the middle body. A body portion (111) fastened to the lower end of (121), communicating with the middle body (121) and having an outlet hole (111a) formed therein for sending firefighting water flowing in from the inlet pipe portion (112) to the middle body (121), It is formed to protrude outward from the body portion 111 and includes an inlet pipe portion 112 in which an inlet hole 112a through which fire-fighting water flows is formed to communicate with the outlet hole 111a, and the valve disk ( 141 and 142 open or close the fire hydrant by opening and closing the outlet hole 111a of the body portion 111 according to the raising and lowering of the valve shaft 135, and the valve disks 141 and 142 according to the lowering of the valve shaft 135. When opening the outlet hole (111a), the fire extinguishing water flowing in from the inlet hole (112a) of the inlet pipe part 112 changes the flow of water to the outlet hole (111a) and at the same time flows into the outlet hole (111a). In order to smoothly guide the guide members 151, 152, and 153 toward the inlet pipe portion 112, inclined guide surfaces 151a and 152a are formed to be inclined upward from the outlet side of the inlet hole 112a toward the inlet side of the outlet hole 111a. It is characterized in that it further includes.

According to this, the firefighting water flowing in from the outflow hole 111a can be smoothly guided to change the direction of the water flow in the direction of the outflow hole 111a without causing a membranous phenomenon, and as a result, pressure loss can be minimized.

The inclined guide surfaces 151a and 152a are characterized in that they are curved.

Alternatively, the inclined guide surfaces 151a and 152a may be formed flat.

In the above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, the guide members (151, 152) are formed to protrude upward on the upper surface of the valve disk (141), and the guide members (151, 152) It is characterized in that through holes (151b, 152b) into which the valve shaft 135 is fastened are formed.

As shown in FIG. 5, in an above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, a space Sa is formed between the guide member 152 and the valve disk 141. It is characterized by being formed in a plate shape as much as possible.

According to this, by reducing the weight, the lifting operation becomes smoother and smoother, and material costs can also be reduced.

The guide members 151, 152, 153 and the valve disk 141 may be made of copper or brass.

In an above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, the lower end is supported on the valve disc 141 to support the plate-shaped guide member 152, thereby supporting the guide member 152. It is characterized in that a support 161 is further included.

In the above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, the guide member 151 protrudes upward from the valve disk 141 and is located between the inclined guide surface 151a and the valve disk 141. It is characterized in that it is formed to be filled.

Therefore, the guide member 151 shown in FIGS. 1 to 4 is a solid type guide member 151.

Meanwhile, according to an above-ground fire hydrant with improved water flow performance according to another embodiment of the present invention, as shown in FIG. 6, the guide member 153 has a passage hole in the center through which the valve disk 142 can pass ( 153c) is formed, and one side is fixed to the outlet side of the inlet hole 112a and the other side is fixed to the inner peripheral surface of the body portion 111, so that it is fixedly provided inside the lower body 110.

At this time, the valve disk 142 is formed so that its outer periphery is aligned with the through hole 153c, and when the fire hydrant is opened, the valve shaft 135 is lowered so that the valve disk 142 meets the through hole 153c. It is characterized in that it forms an inclined guide surface together with the front of the guide member 153 by blocking it.

In the ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention, the inlet pipe portion 112 is raised upward from the bottom surface 111b of the body portion 111 by a set height h1. It is formed to protrude outward from the outer peripheral surface of the body portion 111, and is formed on the lower side of the body portion 111, a disk receiving groove 111c for accommodating the valve disks 141 and 142 that descend to open the tube bodies 110, 121 and 122. is formed, and the disk receiving groove 111c is recessed downward at a position below the position of the inflow pipe portion 112, so that when the valve shaft 135 is lowered to open the pipe bodies 110, 121, and 122, the Valve disks (141, 142) are accommodated inside the disk receiving groove (111c), and the valve disks (141, 142) accommodated in the disk receiving groove (111c) flow into the inlet hole (112a) and into the outlet hole (111a). It is characterized by not impeding the outflow of firefighting water.

According to this, when the fire hydrant is opened, the valve disks 141 and 142 are inserted into the disk receiving groove 111c and are not in the flow path of fire-fighting water from the inlet hole 112a to the outlet hole 111a, thereby preventing the outflow of fire-fighting water at all. It won't disturb you.

Therefore, the flow path obstruction caused by the valve disks 141 and 142, that is, the flow resistance, is significantly reduced compared to the prior art. In particular, in the lower body 110, the flow path resistance caused by the valve disk 141 is completely eliminated, thereby improving the waterproofing performance of the above-ground fire hydrant. There are benefits to improving it.

In the ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention, the body portion 111 is characterized in that it is formed in a straight pipe type.

Therefore, as in the past, the membranous phenomenon that occurs in the shape of a jar does not occur and the pressure loss is reduced.

In an above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, when the valve shaft 135 is lowered and the valve disk 141 is accommodated in the disk receiving groove 111c, the valve disk 141 ) is characterized in that the depth d1 of the valve disc receiving groove (111c) is formed such that the upper end of the valve disc receiving groove (111c) does not protrude to a higher position than the edge of the entrance of the disc receiving groove (111c).

The fact that “the top of the valve disk 141 does not protrude to a higher position than the edge of the inlet of the disk receiving groove 111c” means that the valve disk 141 is completely accommodated in the disk receiving groove 111c. .

The fact that “the tops of the valve discs 141 and 142 do not protrude to a higher position than the edge of the inlet of the disc receiving groove 111c” means that the entire valve disc 141 is accommodated in the disc receiving groove 111c. This means that the top of the valve disc 141 when it is inserted into the disc receiving groove 111c is located at least equal to or lower than the bottom of the inner peripheral surface of the inlet hole 112a.

In the above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention, an inlet flange is formed to protrude outward from the outer circumferential surface of the inlet side of the inlet pipe portion 112 to connect the pipe to an external water pipe (not shown) ( 113) and a body flange 114 that protrudes outward from the outer peripheral surface of the outlet side of the outlet hole 111a of the body 111 and is connected to the middle body 121. do.

The body portion 111, the inlet pipe portion 112, the inlet flange 113, and the body flange 114 are integrally molded through a single casting process, so that the lower body 110 can be molded through a single casting process. It is characterized by

According to this, since it is formed through a single casting process, the molding time and man-hours can be reduced, which has the advantage of reducing the overall molding cost of the lower body 110.

In addition, in the ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention, a seat ring 137 provided on the lower body 110 and for seating the valve disks 141 and 142, and the valve disks 141 and 142 When contacting the lower side of the seat ring 137 and closing the outlet hole 111a of the lower body 110, the seat ring (137) is used to prevent firefighting water from leaking through the gap between the seat ring 137 and the valve discs 141 and 142. In order to seal the valve disks 141 and 142 (137), the packing 143 is installed on the valve shaft 135 so as to contact the lower surfaces of the valve disks 141 and 142.

In addition, a washer 144 for firmly fastening the packing 143 to the valve disc 141, and a washer 144 is screwed to the valve shaft 135 at the bottom of the washer 144 to form a packing. It is configured to further include a fastening nut 145 that is tightly fastened to (143).

Meanwhile, the front view and top view of the guide members 151 and 152 shown in FIG. 4 correspond to both the solid type guide member 151 shown in FIGS. 1 and 2 and the plate-shaped guide member 152 shown in FIG. 5. It is a picture that does.

The following describes the operation of an above-ground fire hydrant with improved water flow performance according to an embodiment of the present invention having the above configuration.

In a state where the hydrant is closed by blocking the outlet hole 111a of the lower body 110, if the control nut 131 is loosened (for example, turned to the left), the valve shaft 135 goes down, and as the valve shaft 135 goes down, the valve The valve disk 141 is lowered integrally with the shaft 135, and the lower end of the valve shaft 135 is lowered until it touches the bottom 111b of the disk receiving groove 111c, and the valve disk 141 is lowered into the disk receiving groove 111c. (111c) is completely charged.

In this way, when the valve disk 141 is completely inserted into the disk receiving groove 111c, the fire extinguishing water entering the inlet hole 112a passes through the outlet hole 111a without being disturbed by the flow resistance of the valve disk 141, that is, the flow path. It flows out to the middle body 121 and the upper body 122.

Furthermore, the firefighting water flowing into the inflow hole (112a) is guided by the inclined guide surfaces (151a, 152a) of the guide members (151, 152) and naturally and smoothly changes the direction of the flow path to the outflow hole (111a), thereby forming the outflow hole (111a). It exits with

Then, when the handle (not shown), which is a separate operating mechanism, is inserted into the head of the adjustment nut 131 and the adjustment nut 131 is tightened (for example, when turned to the right), the valve shaft 135 rises and the valve disc 141 is seated. It is seated at (137) and the hydrant is closed by blocking the outlet hole (111a) of the lower body (110).

In this way, preferred embodiments according to the present invention have been examined, and it is common knowledge in the relevant technical field that in addition to the embodiments described above, the present invention can be implemented in other specific forms without changing the technical idea or essential features. It is self-evident to those who have it. Therefore, the above-described embodiments should be understood as illustrative and not restrictive.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: Ground-type fire hydrant with improved water flow performance according to an embodiment of the present invention
110,121,122: tube body 110: lower body
111: body part 111a: outflow hole
111b: Bottom surface 111c: Disc receiving groove
112: inlet pipe 112a: inlet hole
113: inlet flange 114: body flange
h1: Height of formation of inlet pipe part d1: Depth of disc receiving groove
121: middle body 122: upper body 122a: outlet
131: adjustment nut 135: valve shaft
137: Seat ring 141,142: Valve disc
143: Packing 144: Fixing washer
145: fastening nut 151,152,153: guide member
151a, 152a: Inclined guide surface 151b, 152b: Through hole
153c: pass hole 161: support

Claims (2)

Pipe bodies (110, 121, 122) formed with an inlet hole (112a) through which fire-fighting water supplied from a fire-fighting water supply source flows and an outlet (122a) through which fire-fighting water flowing into the inlet hole (112a) is discharged to the outside, and on the upper side of the pipe body The tube body (110, 121, 122) is installed to be rotatable and rotates in place, and the tube body (110, 121, 122) is mounted so as to rise and fall in the vertical direction according to the rotation of the adjustment nut (131), which is screwed to the adjustment nut (131) and rotates in place. In an above-ground fire hydrant comprising a valve shaft 135 and a valve disk 142 provided at the lower end of the valve shaft 135 to open and close the pipe bodies 110, 121, and 122,
The tube bodies (110, 121, 122) are,
The lower body 110 is formed with the inlet hole 112a through which fire-fighting water supplied from the fire-fighting water supply source flows and the valve disk 142 is located, and the middle body communicates with the lower body 110 and is fastened to the upper end of the lower body ( 121), an upper body 122 that communicates with the middle body 121, is fastened to the top of the middle body 121, has an outlet 122a through which fire-fighting water is discharged to the outside, and is provided with the adjustment nut 131. It consists of
The lower body 110,
A body portion ( 111) Wow,
It is formed to protrude outward from the body portion 111, and includes an inlet pipe portion 112 in which an inlet hole 112a through which fire-fighting water flows is formed to communicate with the outlet hole 111a,
The valve disc 142 opens or closes the fire hydrant by opening and closing the outlet hole 111a of the body portion 111 according to the elevation of the valve shaft 135,
When the valve disc 142 opens the outlet hole 111a as the valve shaft 135 descends, the fire extinguishing water flowing in from the inlet hole 112a of the inlet pipe portion 112 is discharged through the outlet hole 111a. ) In order to change the flow of water and guide it smoothly, an inclined guide surface inclined upward from the outlet side of the inlet hole 112a toward the inlet of the outlet hole 111a is formed toward the inlet pipe portion 112. It is configured to further include a member 153,
The guide member 153 has a passage hole 153c formed in the center through which the valve disk 142 can pass, one side of which is fixed to the outlet side of the inlet hole 112a, and the other side of the body portion ( It is fixed to the inner peripheral surface of 111) and is provided in a fixed manner inside the lower body 110,
The valve disk 142 is formed so that its outer periphery is aligned with the through hole 153c, and when the fire hydrant is opened, the valve shaft 135 descends so that the valve disk 142 blocks the through hole 153c and guides it. Forms an inclined guide surface together with the front of the member 153,
The inlet pipe portion 112,
It is formed to protrude outward from the outer peripheral surface of the body portion 111 at a height raised upward from the bottom surface 111b of the body portion 111 by a set height h1,
On the lower side of the body portion 111, a disk receiving groove 111c is formed to accommodate the valve disk 142 that descends to open the tube bodies 110, 121, and 122,
The disk receiving groove 111c is recessed downward at a position below the position of the inlet pipe portion 112,
When the valve shaft 135 is lowered to open the pipe bodies 110, 121, and 122, the valve disk 142 is accommodated inside the disk receiving groove 111c,
The valve disk 142 accommodated in the disk receiving groove 111c does not obstruct the outflow of firefighting water flowing into the inlet hole 112a and flowing out of the outlet hole 111a,
The body portion 111 is formed in a straight line,
An inlet flange 113 that protrudes outward from the outer peripheral surface of the inlet side of the inlet pipe portion 112 and is used to connect the pipe to an external water pipe,
A body flange 114 is formed to protrude outward from the outer peripheral surface of the outlet side of the outlet hole 111a of the body 111 and is configured to further include a body flange 114 for pipe connection with the middle body 121,
The body portion 111, the inlet pipe portion 112, the inlet flange 113, and the body flange 114 are integrally molded through a single casting process, so that the lower body 110 can be molded through a single casting process.
A seat ring 137 provided on the lower body 110 and for seating the valve disc 142,
When the valve disk 142 is in contact with the lower side of the seat ring 137 and closes the outlet hole 111a of the lower body 110, firefighting water does not leak through the gap between the seat ring 137 and the valve disk 142. In order to seal the seat ring 137 and the valve disc 142, a packing 143 is installed on the valve shaft 135 so as to contact the lower surface of the valve disc 142,
A washer 144 for firmly fastening the packing 143 to the valve disc 142,
The water flow performance is characterized in that it further includes a fastening nut 145 that is screwed to the valve shaft 135 at the bottom of the washer 144 so that the washer 144 is fastened in close contact with the packing 143. Improved above-ground fire hydrants.
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