JP3909733B2 - Water discharge valve for fire pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water discharge valve for a firefighting pump that is disposed on the discharge side of a firefighting pump and is used to control the supply and shutoff of fire extinguishing water.
[0002]
[Prior art]
FIG. 2 shows the structure of a conventional water discharge valve for a fire pump. This water discharge valve for a fire pump is attached to a cylindrical valve seat 2 made of an aluminum casting or the like having a vertical water passage 1 through which fire extinguishing water passes, and to the outer periphery on the front end side of the cylindrical valve seat 2 so as to be rotatable in the circumferential direction. A casing 4 made of an aluminum casting or the like having a lateral discharge port 3 that intersects the vertical portion of the water channel 1 of the tubular valve seat 2, and a self-weight in a state where the water pressure does not act when incorporated in the casing 4. The water channel 1 is closed by contacting the tip of the cylindrical valve seat 2, and when the fire water is supplied to the water channel 1, the water pressure 1 is separated from the tip of the cylindrical valve seat 2 to open the water channel 1. A backflow prevention valve body 5 and a ball-shaped valve body 7 made of an aluminum casting made of an arcuate curved body that is rotatably incorporated in the casing 4 and opens and closes the discharge port 3 by operation of an external handle 6 are provided. It has a structure. In this case, between the cylindrical valve seat 2 and the cylindrical portion 4a of the casing 4 fitted thereto, there are a stainless ball 8 for making the casing 4 rotatable and an O-ring 9 for stopping water. Intervened. The discharge port 3 is provided in the neck flange portion 4 b of the casing 4. The backflow prevention valve body 5 is provided with a valve rod 10 in the vertical direction at the center, and the upper end of the valve rod 10 is fitted in a guide hole 11 provided in the upper wall portion of the casing 4 so as to be movable up and down. The ball-shaped valve body 7 is fixed to a horizontal rotating shaft 12 by a bracket portion 7 a, and the rotating shaft 12 penetrates the casing 4 in a watertight state so as to be freely rotatable. The handle 6 is fixed to 12 so that it can move in a circular arc in the horizontal direction. A valve seat 13 is provided on the inner periphery of the neck flange portion 4b forming the discharge port 3 so that the ball-shaped valve body 7 contacts and seals when the ball-shaped valve body 7 is stopped. The rotary shaft 12 protrudes outward from the side surfaces of the bracket portions 7 a on both sides of the ball-shaped valve body 7, and is rotatably supported by the bearing portion of the casing 4 while maintaining a watertight state. A drain plug 14 is provided in the lower part of the casing 4 between the discharge port 3 and the tubular valve seat 2.
[0003]
In such a water discharge valve for a fire pump, the handle 6 is at the position a shown in the figure during standby, and in this state, the discharge port 3 is closed by contacting the valve seat 13 sealed by the ball-shaped valve body 7. Further, in this state, the backflow prevention valve body 5 is lowered by its own weight and comes into contact with the tip of the cylindrical valve seat 2 to close the water channel 1. When the handle 6 is moved from the position a to the position b, the ball-shaped valve body 7 that has closed the discharge port 3 moves away from the valve seat 13, that is, the discharge port 3 and the cylindrical valve seat. 2 to the lower part in the casing 4 between the two, the discharge port 3 is released, and water discharge is started.
[0004]
[Problems to be solved by the invention]
However, the water discharge valve for a fire pump having the structure shown in FIG. 2 has a problem that the backflow prevention valve element 5 does not move when dirt or the like enters the guide hole 11. In the water discharge valve for a fire pump having the structure shown in FIG. 2, the backflow prevention valve body 5 is vertically oriented and includes a valve rod 10, and the upper end of the valve rod 10 is provided in a guide hole 11 provided in the upper wall portion of the casing 4. Since it is mounted so as to be able to move up and down, the mounting structure of the backflow prevention valve body 5 becomes complicated, resulting in high costs and troublesome maintenance.
[0005]
The objective of this invention is providing the water discharge valve for fire fighting pumps which can prevent generation | occurrence | production of the situation where a backflow prevention valve body stops moving with earth and sand.
[0006]
Another object of the present invention is to provide a water discharge valve for a fire fighting pump that can easily perform maintenance and inspection of a check valve body.
[0007]
Another object of the present invention is to provide a water discharge valve for a firefighting pump that can change the direction of the discharge port without hindrance although it is a type that allows easy maintenance and inspection of the check valve.
[0008]
[Means for Solving the Problems]
The present invention relates to a cylindrical valve seat having a water passage for water discharge for fire extinguishing water having a vertical portion, and to a vertical portion of the water passage of the cylindrical valve seat connected to the distal end side of the cylindrical valve seat. A casing having a discharge port in the intersecting direction, and in the state where the water pressure is not applied when the casing is incorporated in the casing, the water passage is closed by contacting the tip of the cylindrical valve seat under its own weight, and fire water is supplied to the water passage. The backflow prevention valve body that opens away from the tip of the cylindrical valve seat by the water pressure and an arcuate curved surface that is rotatably incorporated in the casing and opens and closes the discharge port by operating an external handle A water discharge valve for a fire fighting pump provided with a ball-shaped valve body made of a body is improved.
[0009]
In the water discharge valve for a fire fighting pump according to the present invention, the cylindrical valve seat is provided with an attachment portion for being rotatably attached to the fire fighting pump. The connecting portion between the tip of the cylindrical valve seat and the casing is fastened with a bolt and a nut between a flange provided at the tip of the cylindrical valve seat and a flange provided at the end of the casing on the cylindrical valve seat side. It consists of a flange coupling part and is provided in an inclined direction with respect to the axis of the vertical part of the water channel of the tubular valve seat. The cylindrical valve seat is formed in a curved shape so that the vertical part of the water channel inside thereof is connected to the inside of the casing through the curved water channel. The backflow prevention valve body includes a rubber annular edge sandwiched between the flanges of the connecting portion between the tip of the cylindrical valve seat and the casing, and a part of the annular edge that is disposed in the annular edge, and the annular edge And a disc-shaped swing valve body connected to the.
Thus, when the backflow prevention valve body is constituted by a swing valve body that swings around the swing fulcrum, there is no valve rod that can be moved up and down in the guide hole of the casing. Generation | occurrence | production of the situation which a backflow prevention valve body becomes unable to move by earth and sand entering can be avoided, and the reliability of the water discharge valve for fire fighting pumps can be improved.
[0010]
As described above, when the swing valve body is structured to be incorporated in the connection portion of the flange between the cylindrical valve seat and the casing, the maintenance and inspection of the swing valve body can be easily performed by removing the connection portion of the flange. it can.
[0011]
In addition, as described above, when the mounting portion for rotatably mounting the fire pump is provided on the cylindrical valve seat, the cylindrical valve seat can be rotatably mounted on the fire pump. Despite the fact that the swing valve body is built into the joint between the valve seat and the casing flange, and the backflow prevention valve body can be easily maintained and inspected, the direction of the discharge port can be changed without any problems. be able to.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a water discharge valve for a fire fighting pump according to the present invention. The parts corresponding to those in FIG. 2 are given the same reference numerals.
[0013]
In this fire pump water discharge valve, the backflow prevention valve body is constituted by a swing valve body 5 'that swings around a swing fulcrum portion 5b that can be bent. The swing valve body 5 ′ is incorporated at a location of a connecting portion 15 by flanges 2 f and 4 f between the tubular valve seat 2 and the casing 4. More specifically, the connecting portion between the tip of the cylindrical valve seat 2 and the casing 4 includes a flange 2f provided at the tip of the cylindrical valve seat and a flange provided at the end of the casing on the cylindrical valve seat side. 4f consists of a flange coupling portion fastened by bolts and nuts (not shown), and is provided in an inclined direction with respect to the axis of the vertical portion of the water channel of the tubular valve seat. As shown in the figure, the cylindrical valve seat 2 is formed in a curved shape so that the vertical portion of the water channel inside thereof is connected to the inside of the casing 4 through the curved water channel. The backflow prevention valve body is disposed between the annular edge 5a made of rubber and sandwiched between the flanges 2f and 4f of the connecting portion between the tip of the cylindrical valve seat and the casing, and a part thereof is bent. It comprises a disc-like swing valve body 5 'connected to an annular edge 5a by a free rubber swing fulcrum 5b. A reinforcing body / weight 16 is attached to a central portion of a rubber swing disc body 5 ′ with a fixture 17 such as a bolt or a nut . A stopper 18 is provided on the upper inner surface of the casing 4 to determine the upper limit of the swing valve body 5 ′. The cylindrical valve seat 2 is provided with a cylindrical attachment portion 2a that is rotatably attached to a fire pump (not shown). On the inner surface of the mounting portion 2a, an O-ring 9 that seals with a cylinder portion of a fire pump (not shown) is supported. Further, an annular groove 19 is provided on the inner surface of the mounting portion 2a to fit a locking ring (not shown) that locks the mounting portion 2a so that the mounting portion 2a does not fall off from a cylinder portion of the fire pump (not shown). Other configurations are the same as those in FIG.
[0014]
The water discharge valve for a fire fighting pump provided with such a swing valve body 5 'has the handle 6 at the position a shown in the figure during standby . In this state, the discharge valve is brought into contact with the valve seat 13 sealed by the ball-shaped valve body 7. 3 is closed. In this state, the swing valve body 5 ′ is lowered by its own weight and comes into contact with the tip of the tubular valve seat 2 to close the water channel 1.
[0015]
When the fire fighting pump is operated, the swing valve body 5 ′ is bent and pushed up by the swing fulcrum portion 5 b by the water pressure of the fire extinguishing water flowing into the water channel 1, and the water channel 1 is opened. The swing valve body 5 ′ is stopped in a state in which the fixture 17 hits the stopper 18 on the upper inner surface of the casing 4.
[0016]
When the handle 6 is moved from the position a to the position b in this state, the ball-shaped valve body 7 that has closed the discharge port 3 moves away from the valve seat 13, that is, the discharge port 3 and the cylindrical valve. It moves to the lower part in the casing 4 between the seats 2, the discharge port 3 is released, and water discharge is started. At this time, the casing 4 and the tubular valve seat 2 can be rotated with respect to a tubular portion of a fire pump (not shown) so that the discharge port 3 faces in the direction of performing the water discharge operation.
[0017]
When the handle 6 is moved from the position b to the position a while operating the fire fighting pump, the ball-shaped valve element 7 comes into contact with the valve seat 13, the discharge port 3 is closed, and water discharge stops. When the operation of the fire pump is stopped in this state, there is no water pressure to push up the swing valve body 5 ′, so the swing valve body 5 ′ descends and contacts the upper end of the tubular valve seat 2 to close the water channel 1. For this reason, falling water is prevented, and if the operation of the fire pump is started, discharge of fire-extinguishing water can be started immediately without priming.
[0018]
If the backflow prevention valve body 5 is constituted by a swing valve body 5 'as in this example, the valve rod 10 fitted in the guide hole 11 of the casing 4 so as to be movable up and down as in the conventional example shown in FIG. Therefore, it is possible to avoid occurrence of a situation where the backflow prevention valve body 5 does not move when dirt or the like enters the guide hole 11, and the reliability of the water discharge valve for the fire fighting pump can be improved.
[0019]
Further, when the swing valve body 5 'is incorporated in the connecting portion 15 by the flanges 2f and 4f between the cylindrical valve seat 2 and the casing 4, the connecting portion 15 by the flanges 2f and 4f is removed to maintain the swing valve body 5'. Inspection can be performed easily.
[0020]
Further, a設Ru the mounting portion 2a for mounting rotatably relative fire pump to the tubular valve seat 2, since the cylindrical valve seat 2 is rotatable with respect to fire pump, a tubular valve seat 2 flange 2f of the casing 4, 4f have swing valve body 5 'is incorporated in the connecting portion 15 by, despite the maintenance and inspection of the check valve body of the type can be easily, the discharge port 3 orientation Changes can be made without hindrance.
[0021]
Moreover, the swing fulcrum part 5b can also be comprised with a hinge.
[0022]
【The invention's effect】
As described above, in the water discharge valve for a fire fighting pump according to the present invention, the backflow prevention valve body is constituted by the swing valve body that swings around the swing fulcrum, so that it can be raised and lowered within the guide hole of the casing. Therefore, it is possible to avoid the occurrence of a situation where the backflow prevention valve body does not move due to dirt or the like entering the guide hole, and the reliability of the water discharge valve for the fire pump can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a water discharge valve for a fire fighting pump according to the present invention.
FIG. 2 is a longitudinal sectional view of a conventional water discharge valve for a fire pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water channel 2 Cylindrical valve seat 2a Mounting part 2f Flange 3 Discharge port 4 Casing 4a Tube part 4b Neck flange part 4f Flange 5 Backflow prevention valve body 5 'Swing valve body 5a Annular edge 5b Swing fulcrum part 6 Handle 7 Ball valve Body 7a Bracket part 8 Stainless steel ball 9 O-ring 10 Valve rod 11 Guide hole 12 Rotating shaft 13 Valve seat 14 Drain plug 15 Connecting part 16 Reinforcement body and weight 17 Fixing tool 18 Stopper

Claims (1)

A tubular valve seat (2) provided with a water channel (1) for fire-extinguishing water discharge having a vertical portion inside, and connected to the distal end side of the tubular valve seat and perpendicular to the water channel of the tubular valve seat A casing (4) having a discharge port (3) in a direction intersecting with the part, and the water channel by being brought into contact with the tip of the cylindrical valve seat under its own weight in a state where the water pressure does not act when incorporated in the casing When the fire water is supplied to the water channel, the backflow prevention valve body that opens away from the tip of the cylindrical valve seat by the water pressure is rotatably incorporated in the casing. A water discharge valve for a firefighting pump comprising a ball-shaped valve body (7) made of an arcuate curved body that opens and closes the discharge port (3) by operating an external handle;
The cylindrical valve seat (2) is provided with a mounting portion (2a) for rotatably mounting to the fire pump,
The connecting portion between the tip of the cylindrical valve seat (2) and the casing (4) is provided at the flange (2f) provided at the tip of the cylindrical valve seat and at the end of the casing on the cylindrical valve seat side. A flange coupling portion in which the flanges (4f) are fastened with bolts and nuts, and provided in an inclined direction with respect to the axis of the vertical portion of the water channel of the cylindrical valve seat,
The cylindrical valve seat is formed in a curved shape so that a vertical portion of the water channel inside thereof is connected to the inside of the casing through a curved water channel,
The backflow prevention valve body includes a rubber annular edge (5a) sandwiched between flanges (2f) and (4f) of the connecting portion between the tip of the cylindrical valve seat and the casing, and the annular edge (5a). ) And a disc-shaped swing valve body (5 ′) partly connected to the annular edge at the swing fulcrum (5b),
A water discharge valve for fire fighting pumps.

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