JPH1151228A - Double-seated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress intensive collision of fluid against a valve casing wall part so as to reduce vibration by partitioning the inside of the valve casing into a primary side flow passage and a secondary flow passage and forming a partition wall dividing the secondary side flow passage into the upper and lower side flow passages so that the end wall part on the outflow port side can be seen from the outflow port. SOLUTION: When a plug 6 is lifted so as to open a valve, fluid flowing into a primary side flow passage 20 from an inflow port 2 is divided into the upward fluid heading toward an upper flow passage 30a and downward fluid heading toward a lower flow passage 30b, and then, the divided flow converges in an outflow port 3 so as to be discharged from the outflow port 3. In a double-seat valve constructed in this way, a partition wall 4, which divides the inside of a valve casing 1 into a primary side flow passage 20 and a secondary side flow passage 30 and divides the secondary side flow passage 30 into the upper flow passage 30a and the lower side flow passage 30b converging together in the outflow port 3, is formed so that an upper side 40a of an end wall part 40 on the outflow port 3 side can be seen from the outflow port 3 side. In this way, fluid collision against the wall part of the valve casing 1 is reduced, so that vibration in an operation device system can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-seat valve for controlling a flow rate of a fluid by a double-seat plug.

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional front view showing a conventional double-seat type valve device, in which 1 is a valve casing,
The valve casing 1 includes a valve body 1A, an upper lid 1B, and a lower lid 1C.
The valve body 1A has an inlet 2 and an outlet 3 for a fluid.

Reference numeral 4 denotes a partition wall provided in the valve body 1A. The partition wall 4 partitions the inside of the valve casing 1 into a primary flow path 20 and a secondary flow path 30 on the inflow port 2 side. In addition, the secondary flow path 30 is branched and formed into an upper flow path 30a and a lower flow path 30b that join at the outlet 3.

Reference numeral 40 denotes an end wall portion of the partition wall 4 on the side of the outlet 3, 40a denotes an upper side of the end wall portion 40, and 40b denotes a lower side of the end wall portion 40. The lower side 40b is not visible from the outlet 3 side. Thereby, the partition wall 4 has a configuration in which the upper side 40a is close to the upper wall 1a near the outlet 3 and the lower side 40b is close to the lower wall 1b near the outlet 3 in the valve casing 1. .

[0005] 5a is provided on the partition wall 4 and
An upper seat ring 5b connecting the upper side channel 30a of the secondary side channel 30 with the upper side channel 30a
A lower seat ring connecting the lower flow path 30b to the lower flow path 30b; a plug 6 disposed in the valve casing 1; 3
Upper plug 7 that controls the opening and closing of a connection (upper seat ring 5a) with the lower flow path 0a, and lower plug 7 that controls the opening and closing of a connection (lower seat ring 5b) between the primary flow path 20 and the lower flow path 30b. Are coaxial with each other.

Reference numeral 9 denotes a valve stem integrally projecting from an upper surface axis of the upper plug 7, and reference numeral 10 denotes a plug stem. The plug stem 10 is connected to an operating device (not shown) serving as a driving unit. I have.

Reference numeral 11 denotes a lower guide hole provided in a lower lid 1C serving as a bottom portion of the valve casing 1, and 12 denotes a lower plug 8
The lower guide shaft 12 is fitted in the lower guide hole 11 to guide the lower plug 8 in the elevating direction.

Next, the operation will be described. Upper plug 7
The valve casing 1 is raised by opening the plug 6 via the plug stem 10 with the operating device in a valve-closed state in which the valve abuts on the upper seat ring 5a and the lower plug 8 abuts on the lower seat ring 5b. The fluid flowing into the primary side flow path 20 from the inflow port 2 through the upper seat ring 5a flows toward the upper flow path 30a and the lower fluid flows through the lower seat ring 5b toward the lower flow path 30b. The fluid is diverted into a directional fluid. At this time, the upward fluid collides with the upper wall portion 1a of the valve casing 1 and the downward fluid collides with the lower wall portion 1b of the valve casing 1, respectively.
Is discharged from

[0009]

The conventional double-seat valve is constructed as described above.
Since the lower sides 40a and 40b are not seen from the outlet 3 side, and the upper and lower sides 40a and 40b are close to the upper side wall 1a and the lower side wall 1b near the outlet 3 of the valve casing 1,
When the plug 6 is opened, the fluid directed to the outlet 3 strongly collides with the upper wall portion 1a and the lower wall portion 1b of the valve casing 1, and the valve casing 1 vibrates, so that the bolt
There have been problems such as loosening of the nuts and large vibrations of the actuator system, causing problems. Also, as described above, when the fluid strongly collides with the wall of the valve casing 1, the wall acts as a resistance, making it difficult for the fluid to flow. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the collision of fluid with respect to a wall of a valve casing. The vibration of the valve casing and the actuator system caused by the collision can be reduced. It is an object of the present invention to obtain a double-seat valve capable of reducing pressure.

Further, according to the present invention, the flow rate ratio between the upper flow rate and the lower flow rate of the fluid can be changed.
It is an object of the present invention to obtain a double-seat valve that can make the other flow balanced.

[0012]

According to a first aspect of the present invention, there is provided a double-seat valve having a valve casing having an inlet and an outlet for a fluid, and a primary flow path in the valve casing on the inlet side. And a partition formed into a secondary flow path on the outlet side and a partition formed by branching the secondary flow path into an upper flow path and a lower flow path which join at the outlet. Secondary channel and 2
In a double-seat valve including a double-seat plug that controls opening and closing of the connection part of the secondary flow path, at least a part or all of at least one side of the end wall on the outlet side is separated from the outlet by the outlet. It is formed so that it can be seen.

According to a second aspect of the present invention, in the double-seat valve, the partition wall is formed such that at least one of the upper side and the lower side of the end wall on the outlet side is visible from the outlet.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a vertical sectional side view showing a double-seat valve according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the double-seat valve of FIG. 1 as viewed from the outlet side. The same reference numerals are given and duplicate explanations are omitted. In the first embodiment, the interior of the valve casing 1 is partitioned into a primary flow path 20 and a secondary flow path 30, and the upper flow path 30 a where the secondary flow path 30 joins at the outlet 3. End wall 4 on the side of the outlet 3 in the partition wall 4 branched and formed into the lower flow path 30b and the lower flow path 30b.
In this configuration, the upper side 40a of the “0” can be seen from the outlet 3 side.

That is, when the partition 4 is viewed from the outlet 3, the upper side 40a of the partition 4 is positioned diametrically below the upper end 3a of the outlet 3 as shown in FIG. The partition 4 was lowered so that it could be seen. In this case, it is most preferable that the upper side 40a of the partition wall 4 be lowered from the opening upper end 3a of the outlet 3 to about 1/4 of the diameter of the outlet 3, so that the upper fluid flowing through the upper flow path 30a Flows most easily toward the outlet 3, and the upper fluid does not strongly collide with the upper side wall 1 a of the valve casing 1.

Next, the operation will be described. When the plug 6 is raised and opened, the fluid flowing into the primary flow path 20 of the valve casing 1 passes through the upper seat ring 5a to the upper flow path 30a of the secondary flow path 30, The fluid is divided into the lower fluid flowing through the seat ring 5b and the lower fluid 30b.

Here, the upper fluid flowing through the upper flow path 30a toward the outflow port 3 flows through the valve casing 1 because the upper side 40a of the partition wall 4 is lower than the upper end 3a of the opening of the outflow port 3.
No longer collides strongly with the upper side wall 1a near the outflow port 3. For this reason, the upper fluid flowing toward the outlet 3 becomes a smooth flow, and its flow rate becomes larger than that of the lower fluid, so that the upper fluid can be the main flow and the lower fluid can be the balanced flow.

Embodiment 2 FIG. FIG. 3 is a longitudinal sectional side view showing a double-seat valve according to Embodiment 2 of the present invention, and FIG. 4 is a side view of the double-seat valve of FIG. 3 as viewed from the outlet side. Embodiment 2
Then, when the partition wall 4 is viewed from the outlet 3, as shown in FIG. 4, contrary to the case of the first embodiment, the partition 3 is diametrically upward from the opening lower end 3b of the outlet 3. The partition wall 4 was raised so that the lower side 40b of the partition wall 4 could be seen. Even in this case, the partition wall 4 extends from the upper end 3a of the outlet 3 to a height of about 1/4 of the diameter of the outlet 3.
It is most preferable that the lower side 40b is located at a raised position, whereby the lower fluid flowing through the lower flow path 30b flows most easily toward the outlet 3, and the lower fluid flows into the lower wall of the valve casing 1. A strong collision with the portion 1b is eliminated. Therefore, in the case of the second embodiment, the flow of the lower fluid toward the outflow port 3 becomes smooth, and the flow rate of the lower fluid becomes larger than the flow rate of the upper fluid. Can be a balanced flow.

Embodiment 3 FIG. 5 is a vertical sectional side view showing a double-seat valve according to Embodiment 2 of the present invention, and FIG. 6 is a side view of the double-seat valve of FIG. 5 as viewed from the outlet side. Embodiment 3
In FIG. 6, when the partition wall 4 is viewed from the outlet 3, the partition wall 4 is formed so that both the upper side 40a and the lower side 40b of the partition wall 4 can be seen, as shown in FIG. According to the third embodiment, the distance between the upper side 40a and the lower side 40b of the partition wall 4 is shortened, and the upper flow path 30a and the lower flow path 30b are correspondingly widened by that amount, so that the upper fluid and The respective flow rates of the lower fluid can be increased, and the respective effects of the first and second embodiments can be simultaneously expected.

[0020]

As described above, according to the first aspect of the present invention, the primary flow path and the secondary flow path are partitioned and formed in the valve casing, and the secondary flow path is formed in the upper flow path. Since the partition wall that branches into the passage and the lower flow path is formed so that at least a part or all of at least one side of the end wall on the outlet side in the partition wall is visible from the outlet, the partition wall is formed from the outlet. The fluid flowing through the flow path on the side where the side is visible does not strongly collide with the wall of the valve casing, so that the fluid flow becomes smooth, and the vibration of the valve casing and the actuator caused by the strong collision of the fluid. Vibration of the system can be reduced, and as a result, there is an effect that bolts and nuts at the pipe connection portion are not loosened due to the vibration and do not hinder the operation device system. In addition, the flow rate ratio between the fluid flowing through the upper flow path and the fluid flowing through the lower flow path can be changed, so that one of the fluids can be the main flow and the other fluid can be the balanced flow. is there. Further, there is an effect that the total flow rate of the fluid flowing toward the outlet can be increased as compared with the conventional case.

According to the second aspect of the present invention, the partition wall is formed so that at least one of the upper side and the lower side of the partition wall can be seen from the outlet. This is effective when it is desired to make the flow rate of the upper fluid flowing through the lower flow path larger than the flow rate of the fluid flowing through the lower flow path.In a partition where the lower side can be seen from the outlet, the flow rate of the lower fluid is lower than the flow rate of the upper fluid. This is effective when it is desired to increase the flow rate. In a partition where both the upper side and the lower side can be seen from the outlet, there is an effect that the total flow rate can be increased as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a double-seat valve according to Embodiment 1 of the present invention.

FIG. 2 is a side view of the double-seat valve of FIG. 1 as viewed from an outlet side.

FIG. 3 is a vertical sectional side view showing a double-seat valve according to Embodiment 2 of the present invention.

FIG. 4 is a side view of the double-seat valve of FIG. 3 as viewed from an outlet side.

FIG. 5 is a vertical sectional side view showing a double-seat valve according to Embodiment 3 of the present invention.

FIG. 6 is a side view of the double-seat valve of FIG. 5 viewed from an outlet side.

FIG. 7 is a vertical sectional front view showing a conventional double-seat valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inflow port 3 Outflow port 4 Partition wall 6 Plug 7 Upper plug 8 Lower plug 20 Primary flow path 30 Secondary flow path 30a Upper flow path 30b Lower flow path 40 End wall part 40a Upper side 40b Lower side

Claims (2)

[Claims] 1. A valve casing having a fluid inlet and a fluid outlet, and the interior of the valve casing is partitioned into a primary channel on the inlet side and a secondary channel on the outlet side. A partition that branches and forms a secondary flow path into an upper flow path and a lower flow path that merge at the outflow port;
In a double-seat valve including a double-seat type plug that controls opening and closing of a connection portion of the secondary flow path, at least a part or all of at least one side of the end wall on the outlet side is separated from the outlet. A double-seat valve characterized by being formed to be visible. 2. The double-seat valve according to claim 1, wherein the partition wall is formed such that at least one of an upper side and a lower side of an end wall portion on the outlet side is visible from the outlet.