JP5701072B2 - Double seat valve - Google Patents

Description

  The present invention relates to a double seat valve that opens and closes a pair of first and second valve seats provided on one shaft by a pair of first and second plugs moving on the shaft. In the double seat valve, the seal diameters of the first and second plugs are formed to be the same or substantially the same, so that the on / off valve force due to the fluid pressure is canceled and the pair of plugs can be operated with a small driving force. Is.

  A conventional double seat valve is disclosed in Patent Document 1, for example. This has a pair of first and second valve seats provided on one shaft, and a pair of first and second plugs that move on the shaft and simultaneously open and close the first and second valve seats. The outlet side space between the first and second valve seats and the outlet communicated through an outlet opening that opens in only one direction toward the outlet, and the outlet side space between the first and second valve seats; A partition cylinder separating the outlet opening is provided, and a plurality of communication holes having a total opening area equal to the opening areas of the first and second valve seats are formed at equal intervals in the partition cylinder.

JP2010-164138A

  The conventional double seat valve is provided with a partition cylinder separating the outlet side space between the first and second valve seats and the outlet opening, and the total opening area of the partition cylinder is the opening area of the first and second valve seats. By forming a plurality of equivalent communication holes at equal intervals, the inclination of the plug is prevented, but since the fluid preferentially flows out from the flow hole facing the outlet opening, the inclination of the plug is completely eliminated. It could not be prevented and left room for improvement.

  Therefore, the problem to be solved by the present invention is to provide a double seat valve capable of preventing the plug from being inclined.

  In order to solve the above problems, a double seat valve according to the present invention includes a pair of first and second valve seats provided on one axis, and the first and second valve seats moved on the axis. A pair of first and second plugs that open and close at the same time, the outlet side space between the first and second valve seats and the outlet communicate with each other through an outlet opening that opens in only one direction toward the outlet; And a partition cylinder separating the outlet side space between the second valve seat and the outlet opening, and a plurality of communication holes having a total opening area equal to the opening areas of the first and second valve seats are formed in the partition cylinder. In the present invention, communication holes are formed only on both sides in a direction perpendicular to the outlet opening.

  According to the present invention, the plurality of communication holes formed in the partition cylinder are formed only on both sides of the outlet opening in the direction perpendicular to the outlet opening, so that the fluid flowing from between the first and second valve seats to the outlet is generated in the partition cylinder. While acting equally on the plug, it flows down from the outlet opening to the outlet through the communication hole, and the plug can be prevented from being inclined.

It is sectional drawing of the lever float type drain trap to which the double seat valve concerning embodiment of this invention is applied.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. The lever float type drain trap constitutes a casing having a valve chamber 6 inside by fastening a lid 4 with a bolt 5 to a main body 3 having an inlet 1 and an outlet 2. A valve seat member 7 communicating with the valve chamber 6 and the outlet 2 is attached to the main body 3 below the valve chamber 6 by screws (not shown). The valve seat member 7 communicates with the outlet 2 a pair of first and second valve seats 8, 9 provided on one axis, and an outlet side space 10 between the first and second valve seats 8, 9. And an outlet opening 11 opened in only one direction toward the outlet 2. The inlet 1 opens to the lower part of the valve chamber 6, and the outlet 2 opens to the lower part of the valve chamber 6 through the outlet opening 11 and the first and second valve seats 8 and 9.

  A swing shaft 12 is supported by a valve seat member 7 in the valve chamber 6, and a right side portion of a lever 13 is rotatably connected to the swing shaft 12. A hollow spherical float 14 that rises and falls according to the liquid level in the valve chamber 6 is connected to the left end of the lever 13. A connecting shaft 15 parallel to the swing shaft 12 is supported on the right end portion of the lever 13, and the upper portion of the connecting rod 16 is rotatably connected to the connecting shaft 15. The lower portion of the connecting rod 16 is rotatably connected to a valve shaft 19 parallel to the swing shaft 10 supported on the upper end portion of the valve rod 18 of the plug member 17.

  The plug member 17 includes a first plug 20 that opens and closes the first valve seat 8 from the lower outlet side space 10 side, a second plug 21 that opens and closes the second valve seat 9 from the lower valve chamber 6 side, and a first plug. 20 and the valve rod 18 connecting the second plug 21. The pair of first and second plugs 20 and 21 move on the shafts of the first and second valve seats 8 and 9 to simultaneously open and close the first and second valve seats 8 and 9. A partition cylinder 22 is provided to separate the outlet side space 10 between the first and second valve seats 8 and 9 and the outlet opening 11, and the total opening area is equal to the opening area of the first valve seat 8 in the upper part of the partition cylinder 22. The communication holes 23 are formed on both sides of the outlet opening 11 in a direction perpendicular to the outlet opening 11 on the front side and the other side of the paper surface. The communication hole has a total opening area equal to the opening area of the second valve seat 9 in the lower part of the partition tube 22. 24 are formed on both sides in the direction perpendicular to the outlet opening 11 on the front side and the other side in the drawing.

  The operation of the lever float type drain trap is as follows. When the liquid level in the valve chamber 6 is low, the float 14 is lowered as shown in FIG. 1, and the first and second plugs 20 and 21 close the first and second valve seats 8 and 9. When the liquid level in the valve chamber 6 rises due to the drain flowing from the inlet 1, the float 14 moves upward and the lever 13 rotates around the swing shaft 12 in the clockwise direction. The rotation of the lever 13 causes the plug member 17 to move downward via the connecting rod 16 so that the first and second plugs 20 and 21 open the first and second valve seats 8 and 9. Thereby, the drain of the valve chamber 6 is discharged from the first and second valve seats 8 and 9 to the outlet 2 through the outlet side space 10, the communication holes 23 and 24, and the outlet opening 11. The fluid flowing from between the first and second valve seats 8 and 9 toward the outlet 2 flows down from the outlet opening 11 to the outlet 2 through the communication holes 23 and 24 while acting equally on the first plug 20 in the partition cylinder 22. The first plug 20 can be prevented from being inclined.

  When the liquid level in the valve chamber 6 decreases due to the drainage, the float 14 moves downward and the lever 13 rotates counterclockwise around the swing shaft 12. The rotation of the lever 13 causes the first and second plugs 20 and 21 to close the first and second valve seats 8 and 9 by moving on the plug member 17 via the connecting rod 16. This prevents gas leakage.

  The present invention is applicable to all kinds of fluid control devices to which a double seat valve that opens and closes a pair of first and second valve seats provided on one shaft by a pair of first and second plugs moving on the shaft is applied. Can be used.

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Lid 6 Valve chamber 7 Valve seat member 8 First valve seat 9 Second valve seat 10 Outlet side space 11 Outlet opening 12 Oscillating shaft 13 Lever 14 Float 17 Plug member 20 First plug 21 First 2 plug 22 bulkhead cylinder 23 communication hole 24 communication hole

Claims (1)

A pair of first and second valve seats provided on one shaft and a pair of first and second plugs that move on the shaft and simultaneously open and close the first and second valve seats; And the outlet side space between the second valve seat and the outlet are communicated through an outlet opening that opens in only one direction toward the outlet, and the outlet side space between the first and second valve seats is separated from the outlet opening. A partition cylinder is provided, and communication holes having a total opening area equal to the opening area of the first valve seat are formed in the upper part of the partition cylinder only on both sides in the direction perpendicular to the outlet opening, and the total opening area is A double-seat valve characterized in that communication holes equal to the opening area of the two valve seats are formed only on both sides in a direction perpendicular to the outlet opening .

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