JP2006095150A - Hydrant valve device, and fire hydrant apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrant valve device for normally obtaining appropriate discharge water pressure with an inexpensive and compact configuration by commonly using a partitioning valve and an automatic reducing valve. <P>SOLUTION: The hydrant valve comprises a stem 20 having a valve port 13b, which connects a flow-in port 11 to a flow-out port 12 and is arranged in the middle of a flow passage 13, and a valve body 18 for automatically setting the opening/closing degree of the valve port 13b, based on water pressure at a flow-in side and water pressure at a flow-out side, and automatically adjusting the water pressure at the flow-out side to be prescribed water pressure; and a closing axis 30 which abuts on one end of the stem 20 so as to be separating/contacting possible, forcibly pressures and moves the stem by the rotary operation of a handle 33, and allows the valve body 18 to be seated onto the valve port 13b so as to close the valve port 13b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fire hydrant valve device and a fire hydrant device using the same, and more particularly to a fire hydrant valve device that serves as both a gate valve and an automatic pressure reducing valve.

  In a conventional fire hydrant device, a fire hose is connected to a water supply pipe via a gate valve, the fire hose is extended at the time of fire extinguishing, the water discharge nozzle at the tip thereof is directed to the fire extinguishing point, and the gate valve is opened to discharge water. However, the water discharge pressure may become too high, in which case the person holding the water discharge nozzle may be swung around and become dangerous.

In view of this, an automatic pressure reducing valve that automatically adjusts the water discharge pressure to a predetermined pressure between the gate valve and the fire hose has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2-95384.

  However, the above-mentioned conventional fire hydrant device needs to be provided with two valves, a gate valve and an automatic pressure reducing valve, so that there is a problem in that it is difficult to achieve compactness and costs are increased.

  In view of the above-described conventional problems, the present invention is a compact fire hydrant valve device that can always obtain an appropriate water discharge pressure with a low-cost configuration by using both a gate valve and an automatic pressure reducing valve, and a fire hydrant using the same An object is to provide an apparatus.

  The fire hydrant apparatus of the present invention automatically sets the opening / closing degree of the valve port based on the valve port provided in the middle of the flow path connecting the inflow port and the outflow port, and the water pressure on the inflow side and the water pressure on the outflow side. A stem having a valve body that automatically adjusts the water pressure on the outflow side to a predetermined water pressure, and abuts on one end of the stem so as to be detachable, and forcibly pushes the stem by rotating the handle to And a shut-off shaft that closes the valve port by seating the body on the valve port. According to the present invention, since the gate valve function unit and the automatic pressure reducing valve function unit are provided with a single valve device, the gate valve function and the automatic pressure reducing valve function can be achieved by the single valve device, which reduces the cost. And downsizing can be achieved.

  Further, as a specific configuration, the valve box having a flow path communicating between the inlet and the outlet and the outlet has a valve opening at one end and is in contact with and separated from the valve seat of the valve opening. A valve body guide cylinder part that movably holds a stem that is integrally provided with a valve body that opens and closes is provided. A cylinder chamber in which water pressure on the outflow side is introduced is provided at the other end of the valve body guide cylinder part. A piston that is slidably fitted is integrally connected to the stem and a spring that presses and biases the valve body in a direction away from the valve seat is provided, while the stem is in contact with the valve seat. A shut-off shaft with a handle for positioning between a position and a position separated from the valve seat is provided by being screwed into the valve box. With this configuration, it is possible to perform a gate valve function that opens and closes the valve by rotating the shutoff shaft and adjusting its position, and when the water pressure on the outflow side becomes high with the valve open, The piston is pressed against the urging force of the spring, the valve body moves toward the valve seat, and the flow path is narrowed, so that the water pressure on the outflow side decreases, and conversely, the water pressure on the outflow side decreases. Automatic pressure reduction that automatically adjusts the outflow side to a predetermined water pressure by increasing the flow pressure by lowering the operating pressure and moving the valve body away from the valve seat to widen the flow path. Can perform valve function. The water pressure on the outflow side can be arbitrarily set and adjusted by adjusting the urging force of the spring, and a valve box formed with a valve body guide tube portion and a cylinder chamber is provided with a stem provided with a shutoff shaft and a valve; Both of the above functions can be performed with a simple and inexpensive configuration in which the piston and the spring are arranged on the same axis.

  The fire hydrant device of the present invention is a fire hydrant device that is supplied with water in a water supply pipe and has a fire hose built therein, and the above valve device is interposed between the water supply pipe and the fire hose. An appropriate water discharge pressure can always be obtained with an inexpensive configuration in which a single valve device is arranged.

  According to the fire hydrant valve device of the present invention, the gate valve function and the automatic pressure reducing valve function can be performed by a single valve device, and cost reduction and downsizing can be achieved.

  Moreover, the fire hydrant device of the present invention can always obtain an appropriate water discharge pressure with an inexpensive and compact configuration by using the valve device.

  Hereinafter, an embodiment of a fire hydrant valve device of the present invention and a fire hydrant device using the same will be described with reference to FIGS. 1 and 2.

  In FIG. 1, 1 is a fire hydrant device, and 2 is a water pipe for fire fighting. A water supply pipe 3a for a fire brigade and a water supply pipe 3b for a general public are branched from the water supply pipe 2. The water supply pipe 3 a is connected to a fire hydrant 5 for a fire brigade arranged in the housing 4 of the fire hydrant device 1. The water supply pipe 3b is connected to a fire hose 7 having a water discharge nozzle 8 at its tip through a fire hydrant valve device 6 also serving as a gate valve function and an automatic pressure reducing valve function disposed in the housing 4. The fire hose 7 is held by a guide pack 9 while being wound by a take-up reel or the like.

  As shown in FIG. 2, the valve device 6 for a fire hydrant includes a valve body guide tube portion whose upper end forms a valve seat 15 in a valve box 10 having an inflow port 11, an outflow port 12, and a flow path 13 communicating therewith. 14 is formed. The flow path 13 passes from the inflow port 11 through the inflow side flow path 13a, enters the outflow side flow path 13c through the valve port 13b formed on the inner peripheral side of the valve seat 15, and then communicates with the outflow port 12. Yes. And it is comprised so that the water pressure in the outflow side channel | path 13c may be introduce | transduced into the cylinder chamber 16 formed in the lower part of the valve box 10 via the communicating path 16a.

  Reference numeral 18 denotes a valve body, and a packing receiver that holds a packing 21 that presses against the valve seat 15 on an upper portion of a stem 20 that is slidably supported by a support cylinder portion 19 provided at a lower portion of the valve body guide cylinder portion 14. 22 is fastened and fixed to a screw shaft portion 28 formed on the upper end portion of the stem 20 by a nut 24 via a spring washer 23 or the like. A portion of the stem 20 corresponding to the upper portion of the valve body guide tube portion 14 is a small diameter shaft portion 20a. Also, a small-diameter mounting shaft 20 b is projected from the lower end portion of the stem 20, and a piston 25 slidably fitted into the cylinder chamber 16 is fastened and fixed by a nut 27 via a spring washer 26.

  A lid 29 is screwed into the upper opening of the valve box 10. A cut-off shaft 30 is screwed into a screw hole 29a provided in the shaft core of the lid 29 so that the vertical position can be adjusted. Further, a guide hole 32 into which the upper end protruding portion 31 of the screw shaft portion 28 of the stem 20 is fitted is formed at the lower end portion of the cutoff shaft 30. A handle 33 for rotating operation is fixed to the upper end of the cutoff shaft 30. A coil spring 34 is interposed between the lid 29 and the packing receiver 22 of the valve body 18 to urge the valve body 18 to move downward with a small urging force.

  A spring case 35 is screwed into the lower opening of the valve box 10 so that the vertical position can be adjusted. A compression coil spring 39 is interposed between the bottom surface of the spring case 35 and the piston 25.

  According to the fire hydrant valve device 6 configured as described above, when the handle 33 is rotated to move the shut-off shaft 30 upward, the stem 20 urged upward by the compression coil spring 39 moves upward. The packing 21 of the valve body 18 provided on the stem 20 moves upward away from the valve seat 15 to open from the closed state, and the water that flows in from the inlet 11 flows into the inflow channel 13a, the valve port 13b, and the outflow. It flows out from the outflow port 12 through the side flow path 13c. On the other hand, when the handle 33 is rotated to move the cutoff shaft 30 downward, the ceiling surface of the guide hole 32 comes into contact with the top surface of the upper end protruding portion 31 of the stem 20 and further moves the cutoff shaft 30 downward. As a result, the valve body 18 of the stem 20 contacts the valve seat 15. Since the packing 21 of the valve body 18 is in close contact with the valve seat 15 at the time of contact, the valve port 13b is reliably closed. Thus, the gate valve function for opening and closing the valve can be performed by rotating the cutoff shaft 30.

  Further, the water pressure supplied from the water supply pipe 3b may vary in a wide range such as 0.38 to 2.0 MPa, but in this embodiment, the water pressure on the inlet 11 side is the above-described valve open state. Even if it changes in this way, by the effect | action demonstrated in detail next, it reduces automatically to the predetermined | prescribed water pressure arbitrarily set within the range of 0.33-0.62 MPa, and water is made to flow out from the outflow port 12 An automatic pressure reducing valve function can be used.

  That is, when the water pressure in the outflow passage 13c increases, the water pressure is introduced into the cylinder chamber 16 through the communication passage 16a, and the piston 25 moves downward against the urging force of the compression coil spring 39 by the water pressure. As a result, the valve body 18 provided on the stem 20 is pushed downward, the packing 21 moves toward the valve seat 15, and the flow path 13 is narrowed at the valve seat 15 portion. As a result, the pressure reduction rate with respect to the flow from the inlet 11 to the outlet 12 is increased, and the water pressure in the outflow side channel 13c is automatically reduced to a predetermined pressure.

  Conversely, when the water pressure in the outflow side channel 13c decreases, the pressing force acting on the piston 25 decreases, and as a result, the valve body 18 provided on the stem 20 is pushed upward by the urging force of the compression coil spring 39, The packing 21 of the valve body 18 moves away from the valve seat 15 and the flow path 13 is expanded at the valve seat 15 portion. As a result, the pressure reduction rate becomes small, and automatic pressure reduction is performed so that the water pressure in the outflow side channel 13c becomes a predetermined pressure.

  Thus, an automatic pressure reducing valve function for automatically adjusting the water pressure on the outlet 12 side to a predetermined water pressure can be provided. The water pressure can be arbitrarily set and adjusted by rotating the spring case 35 to move it up and down and adjusting the urging force of the compression coil spring 39 against the piston 25.

  Further, according to the fire hydrant device 1 provided with the fire hydrant valve device 6, when the fire is extinguished, the front door of the housing 4 is opened, the fire hose 7 is pulled out, and the water discharge nozzle 8 is directed to the fire extinguishing position. Even if the water pressure supplied from the water supply pipe 3b is a high pressure of, for example, about 1.0 to 2.0 MPa, the water pressure supplied to the predetermined water pressure set to, for example, about 0.33 to 0.62 MPa. The pressure is automatically reduced and supplied to the fire hose 7. Therefore, even if a general person has the water discharge nozzle 8, the fire extinguishing operation can be performed safely and accurately without fear of being swung by the water pressure. Moreover, not only can the valve be opened and closed simply by arranging the single valve device 6 in the fire hydrant device 1, but also an appropriate water discharge pressure can always be obtained.

  Further, according to the configuration of the fire hydrant valve device 6 of the present embodiment, the valve box 10 in which the valve body guide cylinder portion 14 and the cylinder chamber 16 are formed, the stem 20 including the partition shaft 30 and the valve body 18, and the piston 25. And the compression coil spring 39 can be performed on both the above functions with a simple and inexpensive structure.

  In the fire hydrant device 1 of the above embodiment, an example in which the fire hydrant fire hydrant 5 is disposed in the housing 4 is shown, but the fire hydrant fire hydrant 5 is necessarily disposed in the housing 4. There is no need.

It is a front view which shows schematic structure of the fire hydrant apparatus of one Embodiment of this invention. It is a partial vertical front view of the valve device for fire hydrant of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire hydrant apparatus 3b Water supply pipe 6 Fire hydrant valve apparatus 7 Fire extinguishing hose 10 Valve box 11 Inlet 12 Outlet 13 Flow path 13b Valve port 14 Valve body guide cylinder part 15 Valve seat 16 Cylinder chamber 18 Valve body 20 Stem 25 Piston 30 Cut off Shaft 39 Spring

Claims (3)

A valve port provided in the middle of the flow path connecting the inlet and the outlet;
A stem provided with a valve body that automatically sets the opening / closing degree of the valve port based on the water pressure on the inflow side and the water pressure on the outflow side and automatically adjusts the water pressure on the outflow side to a predetermined water pressure;
A shut-off shaft that contacts the one end of the stem in a detachable manner, forcibly pushes the stem by a rotating operation of a handle, seats the valve body on the valve port, and closes the valve port,
A valve device for a fire hydrant, comprising: A valve body having an inflow port, an outflow port, and a flow path communicating between them, and a valve body having a valve opening at one end and abutting and separating from the valve seat of the valve opening to open and close the flow path are integrated. A valve body guide cylinder for holding the provided stem movably is provided, and a cylinder chamber into which the water pressure on the outflow side is introduced is provided at the other end of the valve body guide cylinder, and is slidably fitted into the cylinder chamber. A piston is integrally connected to the stem, and a spring is provided to press and urge the valve body in a direction away from the valve seat, while the stem is located at a position where the valve body abuts the valve seat and a position away from the valve seat. A valve device for a fire hydrant, wherein a shut-off shaft with a handle for positioning between the two is screwed into a valve box. A fire hydrant device that is supplied with water through a water supply pipe and has a fire hose built therein, wherein the fire hydrant valve device according to claim 1 or 2 is interposed between the water supply pipe and the fire hose. Fire hydrant device.

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