JP3738069B2 - Gate valve and gate valve unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is provided between a water distribution pipe and a water supply pipe, and a gate valve and a gate valve unit for partitioning between the water distribution pipe and the water supply pipe by lowering the valve body along the valve rod and seating on the valve seat It is about.
[0002]
[Prior art]
Conventionally, water supply for condominiums, buildings, etc. is a system in which tap water is temporarily stored in a water tank, pumped up to a height above the top floor, and supplied to each house. In such a water supply system, a gate valve is disposed in front of the pump, and when the pump is stopped, the water distribution pipe is shut off to prevent reverse flow of water and the like. In such a system where water is stored after being stored in the aquarium, there is a problem with hygiene, etc. due to garbage entering the aquarium. In recent years, water is supplied directly from the water pipe to the condominium or building. A direct water supply system is desired. Even in this directly connected water supply system, in order to obtain a desired water pressure on the top floor, pressure is applied using a pump, and a gate valve for shutting off the water pipe is indispensable when the pump is stopped.
[0003]
As shown in FIG. 5, the conventional gate valve is configured so that a valve body 50 formed in a wedge shape in cross section is brought into contact with a valve seat 52 formed in a water distribution pipe 51. In this case, the water distribution pipe 51 is circular, and the valve body 50 that closes it is also formed in a circular shape. Also, two valve bodies 50 are provided back to back. When the valve body 50 is lowered from the open state, the valve bodies 50 are fitted into both valve seats to block the passage. This gate valve is usually made of an iron casting, which causes a problem that rust is produced with the passage of time and the tap water becomes cloudy red. In order to eliminate this rust problem, it has been proposed to make the gate valve with a cast stainless steel.
[0004]
[Problems to be solved by the invention]
However, the gate valve requires a certain width for the valve seat 52 in order to securely seat the valve body 50 on the valve seat 52, and thus the thickness of the water distribution pipe 51 serving as the valve seat 52 is also increased. For this reason, when the gate valve is made of a cast stainless steel, a large amount of stainless steel has to be used, which causes a problem that production costs such as material costs increase.
[0005]
An object of the present invention is to solve the above-mentioned conventional problems and to provide an inexpensive gate valve even if the gate valve is made of stainless steel. Another object of the present invention is to provide a novel gate valve unit for directly connected water supply.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided between a water distribution pipe and a water supply pipe, and the valve body is lowered along the valve stem and is seated on the valve seat so that the space between the water distribution pipe and the water supply pipe is reduced. In the partition valve for partitioning, the valve seat is provided as a separate member from the water pipe, the valve seat member fixed to the water pipe, the valve seat member is disposed opposite to the valve seat member, and the valve seat member A guide member into which the valve body is fitted, and a gap between the guide member and the valve seat member is gradually narrowed in the partition direction of the valve body, and the valve body is formed in a wedge shape in the partition direction It is characterized by being.
[0007]
In the present invention, the guide member is substantially parallel to the partitioning direction of the valve body, and the valve seat member is inclined in a direction in which the interval between the guide member and the guide member gradually decreases toward the partitioning direction of the valve body. and to have, it is effective.
[0008]
Furthermore, the present invention is effective when a layer of an elastic member is provided on a surface of the valve body that is seated on the valve seat.
In order to achieve the above object, according to the present invention, in a gate valve unit provided in a gate valve for partitioning between a water pipe and a water pipe, two water pipes are provided to which liquid is pumped to one water pipe. The gate valve according to any one of claims 1 to 3 is provided between each water distribution pipe and the water supply pipe.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front sectional view showing an embodiment of a gate valve and a gate valve unit according to the present invention, and FIG. 2 is a side sectional view thereof.
[0010]
1 and 2, reference numerals 1 and 1 ′ denote water distribution pipes through which water is conveyed from the direction of the arrow by separate pumps (not shown), and these water distribution pipes 1 and 1 ′ are shown in FIG. As clearly shown, a water supply pipe 2 bent at 90 ° is provided. The water distribution pipes 1, 1 ′ are provided with gate valves 3, 3 ′. The gate valves 3, 3 ′ are bilaterally symmetric, but the structure is the same, so the gate valve 3 will be described. The water distribution pipes 1, 1 ', the water supply pipe 2, and the gate valves 3, 3' are generally made of stainless steel.
[0011]
As shown in FIGS. 1 and 3, the water pipe 1 is provided with a valve seat member 5 having a valve seat 4 in the pipe. In this example, the valve seat member 5 is fixed in the water pipe 1 by welding. ing. The valve seat member 5 is formed in a cylindrical shape, and is formed on an inclined surface that becomes to the right as a facing surface of a valve body 10 to be described later heads downward. An opening 6 is formed in this inclined surface, and the valve seat 4 is around the opening 6. In addition, a guide member 7 having an opening 8 facing the inclined surface of the valve seat member 5 is also fixed in the pipe of the water distribution pipe 1 by welding, and the guide member 7 has side portions extending to the valve seat member 5 on both sides thereof. A guide 9 is provided integrally. Since the valve seat member 5 and the guide member 7 are separate members from the water distribution pipe 1 and are fixed in the water distribution pipe 1 later, they can be made by pressing a stainless steel plate of several millimeters.
[0012]
Further, as shown in FIGS. 1 and 4, the valve body 10 is formed in a wedge shape so as to enter between the valve seat member 5 and the guide member 7, and is screwed into the valve stem 11. The valve stem 11 is rotatably mounted on the valve lid 12 and a handle 13 is attached to the upper end thereof. Even if this valve stem 11 rotates, the valve body 10 itself does not move up and down, and the valve body 10 whose rotation is prevented by the valve seat member 5 and the guide member 7 is moved up and down along the valve stem 11 so that the valve body 10 It is moved between a position where the water distribution pipe 1 indicated by a solid line is blocked and a position where the water distribution pipe 1 indicated by a chain line is opened.
[0013]
A rubber plate 14 as an elastic member formed in a film shape is attached to the valve body 10 on the opposite surface of the valve seat 4, and the valve plate 10 has an airtight property by the rubber plate 14. Be seated. Further, by providing this rubber plate member 14, even if a slight error occurs in the attachment position of the valve seat member 5, it is also used to allow this. Further, by providing the rubber plate member 14, even if the valve seat 4 of the gate valve 3 is slightly deformed by pressure or the like, it can be adapted.
[0014]
In addition, the code | symbol 15 is a check valve, the gate valve 3 cannot be opened and closed rapidly, and it prevents that a water flows back in the meantime. Reference numeral 16 denotes a pipe for arranging a flow meter (not shown) for measuring the amount of water flowing to the water supply pipe 2.
[0015]
Gate valve 3 constituted in this way, it is possible to make by the valve seat member 5 and the guide member 7 pressing a stainless steel material, provides a gate valve of the material costs less and less stainless stainless steel at low cost can do. In addition, the valve seat 4 of the valve seat member 5 can have a large contact area with the valve body 10, and the water distribution pipe 1 can be reliably shut off. Furthermore, when the valve body 10 and the valve seat 4 are required to have high precision and the valve seat member 5 is made by press working, the gate valve 3 has a problem of mounting error of the valve seat member 5. Since the rubber plate material 14 is attached to the facing surface 4, this can be allowed if there is a slight error.
[0016]
Next, the gate valve unit optimum for the direct water supply system in the embodiment shown in FIG. 1 will be described.
The water distribution pipes 1, 1 ′ are supplied with water from the direction of the arrows by separate pumps, and are sent to the water supply pipe 2 via the gate valves 3, 3 ′. Accordingly, since the gates 3 and 3 'are provided in the water distribution pipes 1 and 1' to which water is pumped by a separate pump with respect to one water supply pipe 2, water supply is performed even when one of the pumps fails or maintenance is performed. It is not necessary to stop.
[0017]
【The invention's effect】
According to the first aspect, the valve seat member having a valve seat is provided as a separate member from the water pipe, since the valve seat member is fixed to the water pipes, the valve seat member by pressing the stainless steel material Since it can be made and the material cost of stainless steel is reduced, an inexpensive stainless steel gate valve can be provided. Further, since the wedge-shaped valve body is fitted between the valve seat member and the guide member, the valve body can be securely seated on the valve seat.
[0018]
According to the configuration of the second aspect , since the valve seat surface is formed on the inclined surface with respect to the partitioning direction of the valve body, the valve body can be reliably seated on the valve seat.
[0019]
According to the configuration of the third aspect, since the elastic member layer is provided on the surface of the valve body that is seated on the valve seat, a slight mounting error of the valve seat member can be allowed.
According to the configuration of claim 4, two water distribution pipes for supplying liquid to one water supply pipe are provided, and a gate valve is provided between each water supply pipe and the water supply pipe. It is possible to prevent the water supply from being stopped even when the pump of this type fails or when maintenance is performed.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a gate valve and a gate valve unit according to the present invention.
FIG. 2 is a front sectional view of FIG.
3 is a side view showing a valve seat member and a guide member of the embodiment of FIG. 1. FIG.
4 is a front view showing a valve body of the embodiment of FIG. 1; FIG.
FIG. 5 is a cross-sectional view showing a conventional gate valve.
[Explanation of symbols]
1, 1 'Water distribution pipe 2 Water supply pipe 3, 3' Gate valve 4 Valve seat 5 Valve seat member 7 Guide member 10 Valve body 11 Valve rod 14 Rubber plate member

Claims (4)

In the gate valve that is provided between the water pipe and the water supply pipe and partitions the water pipe and the water supply pipe by lowering the valve body along the valve stem and seating on the valve seat,
The valve seat is provided as a separate member from the water pipe, and the valve seat member fixed to the water pipe;
A guide member that is disposed opposite to the valve seat member, and in which the valve body fits between the valve seat members;
A gate valve characterized in that a space between the guide member and the valve seat member is gradually narrowed in the partitioning direction of the valve body, and the valve body is formed in a wedge shape in the partitioning direction . 2. The gate valve according to claim 1, wherein the guide member is substantially parallel to a partition direction of the valve body, and an interval between the valve seat member and the guide member is gradually narrowed in a partition direction of the valve body. A gate valve characterized by being inclined in a direction.   The gate valve according to claim 1 or 2, wherein a layer of an elastic member is provided on a surface of the valve body that is seated on the valve seat. In the gate valve unit provided in the gate valve that partitions between the water pipe and the water supply pipe,
Two water distribution pipes, each of which supplies liquid to one water supply pipe, are provided, and the gate valve according to any one of claims 1 to 3 is provided between each water supply pipe and the water supply pipe. A gate valve unit characterized by that.

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