JPH07280107A - Valve device - Google Patents

Abstract

PURPOSE:To increase a flowrate and shorten valve stroke without changing a port diameter for maintaining the relative compact size of a valve body or an operation section, regarding a single seat valve. CONSTITUTION:This device has a valve plug 5, so as to face an opening 9a formed on the division 11 of a valve body 1 and to adjust a flowrate through the opening 9a. The valve plug 5 is provided with a flow passage 20 keeping continuity between both sides across a valve seat section 5a. Furthermore, an adjusting member 21 is laid for opening and closing the flow passage 20 on the operation of the valve plug.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device suitable for use as a single-seat type control valve and control valve for controlling the flow rate of various controlled fluids.

[0002]

2. Description of the Related Art Conventionally, as a valve device of this type, a single-seat type flow control valve having a structure shown in FIG. 6 has been known. To briefly explain this, reference numeral 1 in the drawing indicates a valve body, 2
Is an upper lid which is attached to the upper opening by a plurality of bolts 3 and nuts 4, and a rod portion 6a of a valve shaft 6 having a valve plug (valve body) 5 at its inner end penetrates the upper lid 2. It is supported so as to be slidable upward and downward.

The valve shaft 6 is slidably supported in a cylindrical plug guide 7 fixed to the valve body 1 side, and its rod portion 6a is arranged in the lid 2. The shaft sealing unit 8 is supported while maintaining liquid tightness, and the upper end projects above the valve body 1.

Reference numeral 9 in the drawing is a seat ring having an opening 9a for the flow of the controlled fluid 10 and a seat portion 9b on which the valve plug 5 is seated when fully closed. The seat ring 9 is formed in the valve body 1. A gasket 13 is attached to an opening 12 formed in a partition wall 11 that partitions the fluid passage. The fluid control operation of the valve device having such a configuration is well known, and the description thereof is omitted.

[0005]

By the way, in the above-mentioned single-seat type valve device, the valve stroke is determined by the port diameter of the opening 9a, and this port diameter is determined by the capacity of the valve device. Due to the structure of the valve body 1, there is a limit to the size of the port diameter, and in order to maximize the flow rate, the valve stroke must be increased. That is, it is necessary to increase the size of the entire valve including the valve body 1 and the operating portion (not shown) mounted on the valve body 1 to drive the valve shaft 6a.

In other words, in the single-seat type valve device having the above-described structure, it is sufficient to increase the port diameter in order to increase the flow rate, but there is a limit due to the structure. Must be increased. Moreover, as the valve body 1 and the like become larger, the valve stroke also becomes longer, which causes a problem that the height of the operating portion also becomes large.

Further, when the port diameter is increased, the thrust generated in the stem is increased, so that an operating device with a large output must be used for the operating portion of the valve plug 5.

The present invention has been made in view of the above-mentioned circumstances, and increases the flow rate or shortens the valve stroke without changing the port diameter, thereby relatively reducing the size of the valve body or the operating portion. The purpose of the present invention is to obtain a suitable valve device for use in a single-seat valve that can be achieved.

[0009]

In order to meet the above-mentioned demands, a valve device according to the present invention is a valve plug which faces an opening formed in a partition wall of a valve body and which adjusts a flow rate passing through the opening. A flow path that connects both sides of the valve seat portion is provided, and an adjusting member that opens and closes the flow path according to the valve plug operation is provided.

[0010]

According to the present invention, when the valve plug closes the opening of the valve body and the flow path provided in the valve plug is closed by the adjusting member, the valve plug is in the fully closed state and the valve plug moves. Along with the flow of fluid through the opening, the flow path of the valve plug is also opened by the adjusting member, and the fluid also flows through this portion, increasing the flow rate and changing the valve stroke without changing the port diameter. Can be shortened.

[0011]

1 to 3 show an embodiment of the valve device according to the present invention. In these figures, the same or corresponding parts as those in FIG. Omit it.

Now, according to the present invention, the partition wall 1 of the valve body 1
The valve plug 5 that faces the opening 9a of the seat ring 9 formed in 1 and adjusts the flow rate passing through the opening 9a is provided with the flow passage 20 that communicates with both sides of the valve seat 5a. A feature of this flow path 20 is that a rod-shaped adjusting member 21 that opens and closes according to the operation of the valve plug 5 is provided.

Here, in the present embodiment, the flow passage 20 has a flow passage port 20a opened at the center of the tip of the valve plug 5, and the flow passage port 20a is provided at the bottom portion of the valve body 1 so as to face the flow passage port 20a. A rod-shaped adjusting member 21 is provided so as to project. The valve seat portion 21a on the tip end side of the rod-shaped adjusting member 21 is configured to close this portion by being seated on the flow passage port 20a.

In other words, in the present embodiment, the controlled fluid has a flow path formed inside the valve plug 5 from the upstream side on the left side in the drawing, from the flow path port 20a at the center of the tip of the valve plug 5. 20 through the side surface outlet of the valve plug 5 to the downstream side on the right side in the figure, and is adjusted to adjust the flow rate passing through the flow path 20 in the valve plug 5. The member 21 is provided in a part of the valve body 1.

According to this structure, the valve plug 5
When closing the flow opening 9a of the seat ring 9 provided in the partition wall 11 of the valve body 1 and closing the flow path 20 provided in the valve plug 5 by the rod-shaped adjusting member 21. The fully closed state as shown in FIG.

When the valve plug 5 moves as shown in FIG. 2, the opening 9a opened by this movement.
While the controlled fluid flows through the portion, the flow path 20 in the valve plug 5 is also opened by the adjusting member 21, and the fluid also flows through this portion. Such a fluid flow is the same in the fully opened state shown in FIG.

Therefore, with such a configuration, the flow rate can be increased and the valve stroke can be shortened without changing the port diameter of the flow opening 9a in the valve body 1. That is, the flow rate of the valve can be increased without increasing the port diameter due to the opening 9a in the valve body 1 due to the existence of the flow passage 20 provided inside the valve plug 5 through which the controlled fluid passes. Further, from this, it is possible to reduce the size of the valve body 1 even with the same flow rate.

In addition, in the above-described structure, the valve stroke determined based on, for example, a value larger than 1/4 of the port diameter can be shortened, so that the operating device for driving the valve plug 5 is small. The height of the operating portion provided on the valve body 1 can be reduced. Further, since the port diameter does not become large, a large output operation device is not required, which is effective in simplifying the operation portion.

The present invention is not limited to the structure of the embodiment described above, but the shape, structure, etc. of each part of the valve device can be appropriately modified and changed. For example, FIGS. 4A and 4B show a case where the rod-shaped adjusting member 21 characterizing the present invention is provided as a member separate from the valve body 1. Here, 2 in FIG.
Reference numeral 4 is an insertion opening formed in the bottom of the valve body 1, 25 is a sealing material, and 27 is a bolt for screwing the flange 26 at the outer end of the adjusting member 21.

Further, FIG. 5 shows a rod-shaped adjusting member 21 which characterizes the present invention, in which the opening 12 of the partition wall 11 in the valve body 1 is provided.
End face portion 30 continuously provided to the seat ring 9 provided in the vehicle
It shows the case where it is provided integrally with or integrally with. In addition,
30a is a window for fluid passage. If you do this,
An advantage is that the relationship between the seating portion with the valve plug 5 and the seating portion with respect to the flow path 20 according to the present invention can be accurately formed.

Further, the present invention is not limited to such a structure, and various modifications can be considered as the formation state of the flow path 20 in the valve plug 5 and the adjusting member 21 for opening and closing the flow path 20. The point is that the adjusting member 21 can control the opening and closing of the flow path 20 according to the movement of the valve plug 5.

Further, in the above-described embodiment, the case where the fluid flows from the left side to the right side in the drawing has been described, but the present invention is not limited to this, and the same action is obtained when the fluid flows in the opposite direction. Of course, the effect can be obtained.

[0023]

As described above, according to the valve device of the present invention, the valve plug provided facing the opening formed in the partition wall of the valve body and adjusting the flow rate passing through the opening,
The flow path that connects both sides of the valve seat is provided, and the flow path is equipped with an adjusting member that opens and closes according to the valve plug operation. The flow rate can be increased and the valve stroke can be shortened without changing.

That is, according to the present invention, the flow rate of the valve can be increased without increasing the port diameter due to the existence of the flow path provided inside the valve plug through which the fluid flows.
Moreover, this also allows the size of the valve to be reduced for the same flow rate.

Further, since the valve stroke can be shortened, the operating device can be downsized and the height of the operating portion itself can be reduced. Further, since the port diameter does not become large, a large output operation device is not required, which is effective in simplifying the operation portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts in a fully closed state, showing an embodiment of a valve device according to the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a state in which the valve device shown in FIG.

FIG. 3 is a cross-sectional view of essential parts of the valve device shown in FIG. 1 in a fully opened state.

FIG. 4 shows another embodiment of the valve device according to the present invention,
(A) is a principal part sectional view which shows a fully closed state and (b) a fully opened state.

FIG. 5 is a sectional view of an essential part showing another embodiment of the valve device according to the present invention.

FIG. 6 is a schematic cross-sectional view showing a conventional example of a valve device.

[Explanation of symbols]

1 ... Valve body, 2 ... Top lid, 5 ... Valve plug, 5a
... valve seat, 6 ... valve shaft, 7 ... cylindrical plug guide,
9 ... Seat ring, 9a ... Circulation opening, 9b ... Seating part, 10 ... Controlled fluid, 11 ... Partition wall, 12 ... Opening part, 20 ... Flow path, 20a ... Flow path port, 21・ ・ ・ Adjustment member, 21a ・ ・ ・ Valve seat part.

Claims (1)

[Claims] 1. A valve device for controlling a flow rate by opening and closing the opening by operating a valve plug facing an opening formed in a partition wall of a valve body, wherein the valve plug has both sides sandwiching a valve seat portion thereof. A valve device comprising: a flow path communicating with the flow path; and an adjusting member for opening and closing the flow path according to the operation of the valve plug.