JP3723304B2 - Grout transfer relay valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a relay valve for grout conveyance used for dam grout injection or the like.
[0002]
[Prior art]
In the dam grout, cement milk is mainly injected, and injection is simultaneously performed at a number of points. For this purpose, grout preparation (mixing of cement and water, or addition of appropriate additives) is performed in a large grout mixing plant, and then each scattered injection site through a number of grout conveyance paths. It is conveyed to.
[0003]
Since the grout mixing plant and the injection construction site may be separated from each other by several hundred meters, the grout is hardened and the transport path is clogged accordingly. It is known that a relay valve is provided, and in this relay valve for grout conveyance, pressurized air is supplied to convey the grout.
[0004]
A typical example is the one described in Japanese Patent Publication No. 63-564 (referred to as the preceding example).
[0005]
[Problems to be solved by the invention]
However, in this preceding example, one valve body is moved forward and backward by the valve body moving cylinder, the reverse grout supply path is opened, the pressurized air supply path is closed, the forward grout supply path is closed, and pressurization is performed. The operation of opening the air supply path is performed.
[0006]
For this reason, the stroke length of a valve body becomes long, and switching time becomes long in connection with this. Further, since the stroke length of the valve body becomes longer, it is necessary to prepare a corresponding valve body moving cylinder, which increases the cost. In addition, since the stroke length of the valve body becomes long, the sealing performance against the valve seat cannot be secured unless sufficient attention is paid to the centering of the valve body moving cylinder.
[0007]
Furthermore, the grout that has flowed into the casing may flow into the pressurized air supply path, and there is a risk that the grout partially closes the inside of the pressurized air supply path. Even if this risk is small, there is a problem that grout adheres to the pressurized air side valve seat in the casing and deteriorates the sealing performance of the valve body.
[0008]
Therefore, the subject of this invention is shortening the stroke length of the valve body or the cylinder for valve body movement, and obtaining the thing excellent in the sealing performance of the valve body.
[0009]
[Means for Solving the Problems]
The present invention that has solved the above problems is provided with a first valve seat and a second valve seat in a casing having communication ports in three directions, and a conveying path is communicated between them, and the grout is made with respect to the first valve seat. Communicating the supply path, communicating the pressurized air supply path to the second valve seat,
A first valve body moving cylinder is provided along a line connecting the first valve seat and the second valve seat,
The first valve body is integrated with the tip of the cylinder rod, and the first valve body is disposed opposite to the first valve seat,
A second valve body is loosely fitted to the cylinder rod, and the second valve body is disposed opposite to the second valve seat,
The second valve body is biased toward the second valve seat by a repulsive spring having the first valve body or the cylinder rod as a seat,
The second valve body is in a relationship of separating from the second valve seat when pressurized air is supplied that exceeds the urging force of the repulsive spring through the pressurized air supply path.
It is the relay valve for grout conveyance characterized by this.
[0010]
In the present invention, the first valve body is integrated with the tip of the cylinder rod of the first valve body moving cylinder under the configuration having two valve bodies of the first valve body and the second valve body. The first valve body is disposed opposite to the first valve seat, the second valve body is loosely fitted to the cylinder rod, the second valve body is disposed opposite to the second valve seat, and the second The valve body is configured to be urged toward the second valve seat side by a repulsive spring having the first valve body or the cylinder rod as a seat.
[0011]
Therefore, since the second valve element is always in contact with the second valve seat regardless of the movement of the first valve element moving cylinder, the stroke of the valve element moving cylinder is the same as that of the first valve element. A distance sufficient to contact and separate the valve body is sufficient, and a small stroke cylinder for moving the valve body is sufficient. As a result, not only the cost of the cylinder is reduced, but also the sealing performance of the first valve body with respect to the first valve seat is excellent.
[0012]
More characteristically, when the first valve body is separated from the first valve seat and the grout fed through the grout supply path passes through the casing and travels toward the conveyance path, the second valve body is secondly moved by a repulsive spring. Since the valve seat is closed, it is possible to prevent the grout, particularly the cement grout used for the dam grout, from adhering to the second valve seat and inhibiting the sealing performance of the second valve body with respect to the second valve seat.
[0013]
After that, if the first valve body moving cylinder is operated, and the first valve body is closed with the first valve seat, through the pressurized air supply path, pressurized air that exceeds the urging force of the rebound spring is supplied. The second valve body is separated from the second valve seat, and the grout remaining in the conveyance path is pushed out by the pressurized air and can be conveyed to a target location.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.
[0015]
3A and 3B are casings having communication ports in three directions, and a first valve seat 1 and a second valve seat 2 are provided therein. The conveyance path 4 is communicated between them.
[0016]
For example, a grout supply path 5 connected to a mixing plant is communicated with the first valve seat 1, and a pressurized air supply path 6 connected to a compressor or the like is communicated with the second valve seat 2.
[0017]
A first valve body moving cylinder (return cylinder) 7 is provided along a line connecting the first valve seat 1 and the second valve seat 2, and the cylinder rod 7A is disposed in the casings 3B and 3A. The first valve body 10 is detachably integrated with the tip portion of the rod 7A for replacement by means such as screwing, and the first valve body 10 is disposed to face the first valve seat 1.
[0018]
On the other hand, the second valve body 20 is loosely fitted to the cylinder rod 7 </ b> A, and the second valve body 20 is disposed opposite to the second valve seat 2. The second valve body 20 is urged toward the second valve seat 2 by a repulsion spring 30 having the first valve body 10 as a seat .
[0019]
In this case, when the pressurized air A that exceeds the urging force of the repulsive spring 30 is supplied through the pressurized air supply passage 6, the second valve body 20 is in a relationship of separating from the second valve seat 2.
[0020]
The operation of the grouting relay valve having the above structure will be described. First, when the first valve body moving cylinder 7 is operated and the cylinder rod 7A is contracted from the extended state of the cylinder rod 7A in FIG. The valve body 10 is separated from the first valve seat 1 and is in the state shown in FIG.
[0021]
In this state, when the grout G is pumped through the grout supply path 5, the grout G flows into the transport path 4 through the casing 3A. During this period, the second valve seat 2 is closed by the second valve body 20. When a predetermined amount of grout G is supplied, the cylinder rod 7A of the first valve body moving cylinder 7 is extended, and the first valve seat 1 is closed by the first valve body 10. This state is the state of FIG.
[0022]
Next, when the first valve body moving cylinder 7 is operated and the first valve seat 1 is closed by the first valve body 10, the repulsive spring 30 passes through the pressurized air supply path 6 as shown in FIG. 3. If pressurized air A that surpasses the urging force is supplied, the second valve body 20 moves away from the second valve seat 2, enters the casing 3A, and the grout G remaining in the conveying path 4 is removed by the pressurized air A. It can be extruded and transported to the target location.
[0023]
In the above embodiment, the repulsion spring 30 is provided with the first valve body 10 as a seat, but the configuration with the cylinder rod 7A as a seat is considered to be clear from the description, but it is not illustrated. For example, a flange can be fixed to the cylinder rod 7A and the flange can be used as a seat.
[0024]
【The invention's effect】
As described above, according to the present invention, the stroke length of the valve body or the valve body moving cylinder can be shortened, and the sealing performance of the valve body is excellent.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a first operation state of the present invention.
FIG. 2 is a longitudinal sectional view of a second operation state of the present invention.
FIG. 3 is a longitudinal sectional view of a third operation state of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st valve seat, 2 ... 2nd valve seat, 3A, 3B ... Casing, 4 ... Conveyance path, 5 ... Grout supply path, 6 ... Pressurized air supply path, 7 ... Cylinder for 1st valve body movement, 7A ... cylinder rod, 10 ... first valve body, 20 ... second valve body, 30 ... repulsive spring, A ... pressurized air, G ... grout.

Claims (1)

A first valve seat and a second valve seat are provided in a casing having a communication port in three directions, a conveyance path is communicated between them, and a grout supply path is communicated with the first valve seat. A pressurized air supply path is connected to the seat,
A first valve body moving cylinder is provided along a line connecting the first valve seat and the second valve seat,
The first valve body is integrated with the tip of the cylinder rod, and the first valve body is disposed opposite to the first valve seat,
A second valve body is loosely fitted to the cylinder rod, and the second valve body is disposed opposite to the second valve seat,
The second valve body is biased toward the second valve seat by a repulsive spring having the first valve body or the cylinder rod as a seat,
The second valve body is in a relationship of separating from the second valve seat when pressurized air is supplied that exceeds the urging force of the repulsive spring through the pressurized air supply path.
A relay valve for grout conveyance.

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