JP2023060456A - Regulating valve - Google Patents

Abstract

An object of the present invention is to provide a regulating valve capable of easily fully opening or fully closing a flow path in an emergency or the like. A regulating valve includes a valve body, a first valve seat, a first valve body, a first actuator, a second valve seat, a second valve body, and a second actuator. The valve body includes a single first common passage, a first branch passage and a second branch passage branched from the first common passage, and a single second common passage where the first branch passage and the second branch passage merge. and a channel through which fluid passes from the inlet of the first common channel to the outlet of the second common channel. A first valve seat is provided in the first branch passage to form a first valve seat port. The first valve body can open and close the first valve seat port as the first valve shaft moves in the axial direction. The second valve seat is provided at a branch point from the first common channel to the first branch channel and the second branch channel to form a second valve seat port. The second valve body can switch the state of communication between the first common passage and the first branch passage and the second branch passage by rotating about the second valve shaft to open and close the second valve seat port. be. [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regulating valve provided in a piping system through which a fluid such as steam flows to regulate the flow rate of the fluid.

As an on-off valve that is used in a slightly open state, there is a globe valve or the like (see, for example, Patent Document 1). Globe valves adjust the flow rate by turning the handle to move the valve stem up and down, thereby moving the valve body up and down.

JP 2010-174911 A

In the regulating valve described above, due to its structure, the fluid resistance is very large, and the closing torque is large because the valve stem receives the full pressure of the fluid when closed. For this reason, it is difficult to quickly close the valve when a trouble that should be dealt with urgently occurs upstream or downstream of the valve. In this case, it is also difficult to keep the opening constant.

SUMMARY OF THE INVENTION An object of the present invention is to provide a regulating valve that can easily fully open or fully close a flow path in an emergency or the like.

A regulating valve for regulating fluid flow provided by the present invention comprises a valve body, a first valve seat, a first valve body, a first actuator, a second valve seat, a second valve body, and a second actuator. . The valve body includes a single first common passage, a first branch passage and a second branch passage branched from the first common passage, and a single second common passage where the first branch passage and the second branch passage merge. and a channel through which fluid passes from the inlet of the first common channel to the outlet of the second common channel. A first valve seat is provided in the first branch passage to form a first valve seat port. The first valve body can open and close the first valve seat port as the first valve shaft moves in the axial direction. The first drive unit axially moves the first valve shaft. The second valve seat is provided at a branch point from the first common channel to the first branch channel and the second branch channel to form a second valve seat port. The second valve body is a substantially spherical valve body having a switching flow path, and rotates about the second valve shaft to open and close the second valve seat port, thereby connecting the first common path and the first branch. It is possible to switch the state of communication with the road and the second branch road. The second drive unit rotates the second valve shaft to move the second valve body to a position where the flow path is fully closed, a position where the first common flow path and the first branch flow path are communicated, and a first common flow path. Switch to a position where the road communicates with the first branch road and the second branch road.

The switching flow path has a T-shaped cross section perpendicular to the second valve shaft and is connectable to the first common flow path and the second branch flow path, and a flow path from a branch point of the T-shaped flow path. and a channel extending in the axial direction of the second valve shaft and connected to the first branch channel.

The first valve shaft and the second valve shaft may be arranged on the same axis so that the first valve body and the second valve body are positioned between them.

According to this invention, instead of the first valve body for adjusting the flow rate, the substantially spherical second valve body having the switching flow path can be used to fully open or fully close the flow path. Therefore, in an emergency or the like, even if the opening degree of the first valve body is maintained, the flow path can be easily fully opened and fully closed.

1 is a cross-sectional view of a regulating valve according to an embodiment of the invention; FIG. FIG. 4 is a partially enlarged cross-sectional view of a second valve portion of the regulating valve according to the embodiment of this invention; FIG. 4 is an enlarged cross-sectional view (cross-sectional view taken along the line XX) of the second valve body according to the embodiment of the present invention;

A control valve that is an embodiment of the present invention will be described with reference to the drawings. In addition, the structure of this invention is not limited to embodiment.

FIG. 1 is a sectional view of a regulating valve 1 according to an embodiment of this invention. In this embodiment, a globe valve is applied as the regulating valve 1 .

The regulating valve 1 is arranged, for example, in a piping system of a plant (process system) such as a gas plant or a steam plant, and adjusts the flow rate of fluid such as steam flowing through the piping system. The regulating valve 1 of the present embodiment basically controls the flow rate of the fluid by controlling the first valve body 42 (the first valve portion 4) during normal operation. Also, in an emergency or the like, the passage is fully opened or closed by controlling the second valve body 52 (second valve portion 5).

The regulating valve 1 includes a valve box (body) 2, a shaft mounting portion 3, a first valve portion 4, a second valve portion 5, a first driving portion 6, a second driving portion 7, and the like.

Pipe connection portions 8 and 9 to which pipes (not shown) are connected are fixed to both ends of the valve box 2 by welding or the like. A connection flange 10 is formed at the upper end of the valve body 2 . A connection flange 11 formed at the lower end of the shaft mounting portion 3 is fastened to the connection flange 10 with a bolt 12 .

Further, in the valve box 2 , a flow path 21 is formed that connects the pipe connection portion 8 to the pipe connection portion 9 via an inlet 20 and an outlet 25 . The fluid in the pipe connection portion 8 flows into the channel 21 through the inlet 20 and flows out to the pipe connection portion 9 through the outlet 25 .

The flow path 21 is composed of a first common path 22, a first branched path 23A, a second branched path 23B, a second common path 24, and the like. Also, the first valve portion 4 and the second valve portion 5 are arranged in the flow path 21 .

The first common channel 22 is a single channel connecting the inflow port 20 and the second valve portion 5 . The first branch passage 23A is a passage that communicates the second valve portion 5 and the second common passage 24 via the first valve portion 4 . The second branch channel 23</b>B is a channel that connects the second valve portion 5 and the second common channel 24 without passing through the first valve portion 4 . The second common channel 24 is a single channel that communicates the first branched channel 23A and the second branched channel 23B with the outlet port 25 .

The first valve portion 4 is arranged on the first branch passage 23A and has a first valve seat 41 , a first valve body 42 and a first valve stem 45 . The first valve portion 4 adjusts the flow rate of the fluid in the first branch passage 23A.

The first valve seat 41 is, for example, an annular valve seat made of metal such as stainless steel, and is located on the upstream side (second valve portion 5 side) of the first branch passage 23A via a circular first valve seat port 43. and the downstream side (second common path 24 side).

The first valve body 42 is, for example, a globe valve body made of metal such as stainless steel, and is arranged so as to face the first valve seat port 43 . Further, the first valve body 42 can be displaced between the fully closed position and the fully opened position by moving the first valve stem 45 in the axial direction. The fully closed position is a position where the first valve body 42 is seated on the first valve seat 41 to close (fully close) the first valve seat port 43 . The fully open position is a position in which the first valve body 42 is separated from the first valve seat 41 and the first valve seat opening 43 is fully opened.

The first valve stem (first valve shaft) 45 is axially mounted on the shaft mounting portion 3 so as to be movable in the axial direction (the vertical direction in FIG. 1). The first valve stem 45 has one end to which the upper portion of the first valve body 42 is fixed, and the other end to which the first driving portion 6 is connected. The first valve stem 45 is axially moved by turning the handle 61 .

The second valve portion 5 has a second valve seat 51 ( 51 A, 51 B), a second valve body 52 and a second valve shaft 55 . The second valve portion 5 is arranged at a branch point from the first common channel 22 to the first branch channel 23A and the second branch channel 23B, and switches the fluid channel. Specifically, the state of communication between the first common path 22 and the first branch path 23A and the second branch path 23B is switched.

The second valve seats 51A and 51B are, for example, ring-shaped valve seats made of metal such as stainless steel or Teflon (registered trademark) resin, and circular second valve seat openings 53A and 53B are formed. . Also, the second valve seats 51A and 51B form a circular second valve seat opening 53C.

The second valve seat 51A is arranged between the first common passage 22 and the second valve body 52 . The second valve seat 51B is arranged between the second valve body 52 and the second branch passage 23B. The second valve seats 51A and 51B are in contact with the second valve body 52, for example, by the biasing force of disc springs (not shown). That is, the second valve body 52 is always seated on the second valve seats 51A and 51B.

The second valve seat port 53A communicates the first common channel 22 and the switching channel 54 of the second valve body 52 when the second valve body 52 is in the state shown in FIGS. 2(A) and 2(B). . The second valve seat port 53B communicates the switching channel 54 and the second branch channel 23B when the second valve body 52 is in the state shown in FIGS. 2(B) and 2(C). The second valve seat port 53C communicates the switching channel 54 and the first branch channel 23A.

The second valve body 52 is made of metal such as stainless steel, has a substantially spherical shape (four-way ball valve), and has a switching channel 54 inside. Further, the second valve body 52 can rotate on the basis of the second valve stem 55 to open and close the second valve seat openings 53A and 53B. By rotating the second valve body 55, the state of communication between the first common passage 22 and the first branch passage 23A and the second branch passage 23B is switched.

In the present embodiment, the position ((A) in FIG. 1 and FIG. 2) connecting the first common path 22 and the first branch path 23A, the first common path 22 and the first branch path 23A and the second branch path 23B The second valve body 52 can be switched (rotated) between a position (FIG. 2(B)) communicating with and a position (FIG. 2(C)) fully closing the flow path 21 .

The position where the channel 21 is fully opened is the position where the first common channel 22 shown in FIG. 2(B) communicates with the first branch channel 23A and the second branch channel 23B.

The switching channel 54 has channels 54A and 54B, as shown in FIG. As shown in FIG. 3, the flow path 54A has a T-shaped cross section perpendicular to the second valve stem 55. As shown in FIG. FIG. 3 is a cross-sectional view taken along line XX of FIG. 2(A), showing only the second valve body 52. As shown in FIG. 54 A of flow paths are connectable with the 1st common path 22 and the 2nd branch path 23B.

The flow path 54B extends in the axial direction of the second valve shaft 55 (upward in FIG. 2) from a branch point of the T-shaped flow path 54A and is always connected to the first branch path 23A.

Note that the shape of the switching channel 54 is not limited to the illustrated shape as long as the state of communication between the first common channel 22 and the first branch channel 23A and the second branch channel 23B can be switched.

The second valve stem (second valve shaft) 55 is rotatably supported by the valve body 2 while being inserted from the bottom surface of the valve body 2 . The second valve stem 55 is arranged coaxially with the first valve stem 45 . The second valve stem 55 has one end to which the second valve body 52 is fixed, and the other end to which the handle 71 of the second driving section 7 is connected. The second valve stem 55 is rotated by turning the handle 71 .

The first driving part 6 is arranged above the valve body 2 and manually moves the first valve stem 45 in the axial direction. The first driving part 6 includes a handle 61, a yoke sleeve 62 and the like.

The handle 61 is fitted over the yoke sleeve 62 . The yoke sleeve 62 is formed with a female thread groove (not shown) that is screwed into a male thread groove (not shown) formed on the outer periphery of the first valve stem 45 .

As a result, turning the handle 61 causes the first valve stem 45 to move axially via the yoke sleeve 62 .

The second driving part 7 is arranged below the valve box 2 and manually rotates the second valve stem 55 . That is, the second driving section 7 rotates the second valve body 52 to each position described above. The second driving section 7 includes a handle 71 and the like. A handle 71 is secured to the end of the second valve stem 55 by a bolt 72 .

As a result, the second valve stem 55 rotates in the same direction as the handle 71 by rotating the handle 71 .

Next, an operation example of the regulating valve 1 will be described.

Normally, the flow rate of the fluid in the flow path 21 is adjusted basically by controlling the position (opening degree) of the first valve body 42 .

Specifically, the second valve body 52 is fixed at a position where the first common passage 22 and the first branch passage 23A shown in FIG. 2(A) are communicated with each other. Thereby, the fluid flows from the first common channel 22 to the second common channel 24 through the first branch channel 23A. By changing the position of the first valve body 45 as necessary, the flow rate of the fluid is adjusted.

On the other hand, in an emergency or the like, the position of the second valve body 52 is controlled to fully open or fully close the flow path 21 .

Specifically, the second valve body 52 is set to the position where the flow path 21 shown in FIG. 2(B) is fully opened or the flow path 21 shown in FIG. Change to the closed position. That is, the channel 21 is fully opened by connecting the first common channel 22 with the first branch channel 23A and the second branch channel 23B. Further, the flow path 21 is fully closed by closing the second valve seat port 53A.

Since the second valve body 52 is a ball valve body, it is excellent in airtightness. Also, since the second valve stem 55 does not move in the axial direction, it receives less fluid pressure when fully closed than the first valve stem 45 , so it is rotated more than the first valve stem 45 . easy.

In an emergency or the like, the first valve body 45 may be kept at its current position (opening degree) without being moved. That is, the flow path 21 is fully closed (fully opened) without adjusting the position of the first valve body 45 .

As described above, in the embodiment of the present invention, instead of the first valve body for adjusting the flow rate, the substantially spherical second valve body having the switching flow path is used to fully open or fully close the flow path. can be Therefore, in an emergency or the like, even if the opening degree of the first valve body is maintained, the flow path can be easily fully opened and fully closed.

In addition, in the above-described embodiment, a globe valve body (globe valve) is used as the first valve body, but it is not particularly limited to this. A gate valve, a needle valve, a plug valve, or the like may be applied to the present invention as long as it is an on-off valve that opens and closes a valve seat with a valve element by vertically moving a valve shaft.

Although the first drive section and the second drive section in the above-described embodiment are configured to be manually driven, they are not particularly limited to this. It may be a motor-driven, air-driven drive unit, or the like.

In the above-described embodiment, the second valve portion is arranged below the first valve portion, but if the second valve portion is located at the branch point of the first branch passage and the second branch passage, this is particularly true. is not limited to Also, the shape of the flow path is not limited to the above embodiment.

In the above embodiment, as shown in FIG. 1, the regulating valve in which the first driving portion is positioned upward has been described, but the arranging direction of the regulating valve is not particularly limited to this.

INDUSTRIAL APPLICABILITY The present invention can be used in the field of adjusting the flow rate of a fluid such as steam flowing through a piping system of a plant (process system) such as a steam plant.

1 regulating valve 2 valve body 4 first valve section 5 second valve section 6 first drive section 7 second drive section 21 flow path 22 first common path 23A first common path 23B second common path 24 second common path 41 First valve seat 42 First valve body 43 First valve seat port 45 First valve stem (first valve shaft)
51 (51A, 51B) second valve seat 52 second valve body 53 (53A to 53C) second valve seat port 54 switching passage 55 second valve stem (second valve shaft)

Claims (3)

A regulating valve that regulates the flow rate of a fluid,
A single first common road, a first branched road and a second branched road branched from the first common road, and a single second common road where the first branched road and the second branched road merge a valve box having therein a channel through which fluid passes from the inlet of the first common channel to the outlet of the second common channel;
a first valve seat provided in the first branch passage and formed with a first valve seat port;
a first valve body capable of opening and closing the first valve seat port as the first valve shaft moves in the axial direction;
a first drive unit that axially moves the first valve shaft;
a second valve seat provided at a branch point from the first common passage to the first branch passage and the second branch passage and having a second valve seat opening;
A substantially spherical valve body having a switching passage, which rotates about a second valve shaft to open and close the second valve seat port, thereby switching the first common passage, the first branch passage, and the second a second valve body capable of switching the state of communication with the two-fork passage;
By rotating the second valve shaft, the second valve body is moved to a position where the flow path is fully closed, a position where the first common flow path and the first branch flow path are communicated, and the first common flow path. a second driving unit that switches to a position in which the path and the first branch path and the second branch path are communicated;
A regulating valve comprising: The switching passage includes a passage having a T-shaped cross section perpendicular to the second valve shaft and connectable to the first common passage and the second branch passage, and the T-shaped passage. a flow path extending from a branch point in the axial direction of the second valve shaft and connected to the first branch path;
A regulating valve according to claim 1. The first valve shaft and the second valve shaft are arranged on the same axis such that the first valve body and the second valve body are positioned between them.
A regulating valve according to claim 1 or 2.

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