JPH048971A - Regulation valve - Google Patents

Abstract

PURPOSE:To make to respond in the right and the reverse directions by providing a fixed perforated plate between movable perforated plates at both ends, forming a clearance between the movable plate and one side fixed plate, while contacting and sliding the movable plate to the other side fixed plate, and forming the same form of holes to the both fixed perforated plates. CONSTITUTION:A movable perforated plate 3 forms a clearance L between a fixed perforated plate 2 at the upper stream side by the enforcing power of a fluid 4, and contacts and slides with a fixed perforated plate 2 at the downstream side. When penetration holes 10 of the fixed perforated plates 2 and penetration holes 11 of the movable perforated plate 3 are coincided perfectly, the holes are fully opened, and when the movable perforated plate 3 is moved to slip the both holes 10 and 11 perfectly, the holes are perfectly closed. The flow regulation is carried out between the fully opened condition and the perfectly closed condition. Foreign materials in the fluid pass through a flow passage 15, stay at the bottom of a valve box 1, and exhausted to the outside from a plug body 14. When a reverse flow is generated, the movable perforated plate 3 is contacted to the opposite side, and generats a clearance L at the opposite side. Since the penetration holes 10 of the both perforated plates 2 are in the same form in this case, the valve can respond to the flow of the fluid 4a in the reverse direction. And since the penetration holes 10 are expanded in the diameter as going to the upper stream side, the pressure loss is little.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a regulating valve that regulates flow rate.

BACKGROUND OF THE INVENTION Conventionally, as a regulating valve for controlling a flow rate, there is, for example, one shown in Japanese Patent Application Laid-open No. 153232/1983. This involves placing a pair of perforated plates with multiple through holes across the flow path, fixing the perforated plate located on the downstream side, and fixing the perforated plate located on the upstream side to the perforated plate located on the downstream side. It is movably provided in sliding contact with the plate. Further, the diameter of the through hole in the movable upstream perforated plate is enlarged so that the cross-sectional area of the flow path on the upstream side becomes larger. By aligning the through holes of both perforated plates, it is fully opened, and by shifting the through holes of both perforated plates, the cross-sectional area of the flow path is reduced to adjust the flow rate.

Problems to be Solved by the Invention However, the conventional configuration described above has the problem that it can only handle flow in one direction and cannot be placed in a pipe line where backflow occurs.

Additionally, when a backflow occurs, the movable perforated plate is urged by the backflow and separates from the fixed perforated plate, and foreign matter contained in the backflow enters the gap created between the two. There was a problem in that the movement of the movable perforated plate was obstructed.

The present invention solves the above problems and aims to provide a regulating valve that can be used in both forward and reverse directions.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a pair of fixed perforated plates that are arranged in a valve box so as to block the flow path of the valve box, and a pair of fixed perforated plates that are arranged to block the flow path of the valve box. A movable perforated plate to be inserted is provided so as to be movable in sliding contact with one of the fixed perforated plates with a predetermined gap formed between the fixed perforated plate and the other fixed perforated plate. A plurality of through holes forming a flow path for flow rate control are formed in the perforated plate in the same pattern, the through holes in the movable perforated plate are formed in a cylindrical shape, and the through holes in the fixed perforated plate are formed in the movable perforated plate. The diameter of the flow passage is expanded from the facing back side to the front side so that the cross-sectional area becomes larger, and a discharge port is formed at the bottom of the valve box, and a removable plug is provided at the discharge port. This is what I did.

Effect With the above-described configuration, the movable perforated plate receives the urging force of the fluid and forms a gap between it and the fixed perforated plate located on the upstream side.
The fixation located on the downstream side slides into contact with the hole plate and moves. In a fully open state where the through holes of the fixed perforated plate and the through holes of the movable perforated plate completely match, the positive flow of fluid flows into the through holes of the fixed perforated plate located on the upstream side. At this time, since the diameter of the through hole is enlarged on the upstream side, pressure loss can be suppressed. Further, the fluid flows through the through holes of the movable perforated plate into the through holes of the fixed perforated plate located on the downstream side, and flows out from the through holes of the fixed perforated plate to the downstream pipe line.

Then, the movable perforated plate is moved by a distance corresponding to the diameter of the through-hole, and the state where the through-holes of the movable perforated plate and the fixed perforated plate are completely shifted is defined as a fully closed state, and the fully open state and the fully open state are The movable perforated plate is moved between the fixed perforated plate and the through holes are shifted from each other, and the flow rate is adjusted by increasing or decreasing the cross-sectional area of the flow path in each through hole. Further, foreign matter in the fluid that has flowed into the gap between the fixed perforated plate and the movable perforated plate on the upstream side remains at the bottom of the valve box, and is discharged to the outside of the valve box from the discharge port when the stopper is opened.

When a reverse flow occurs, the movable perforated plate receives the biasing force of the reverse flow and slides into contact with the fixed perforated plate on the upstream side during normal flow, and contacts the fixed perforated plate located on the downstream side during normal flow. A predetermined gap is formed between them. Then, the fluid flowing backward flows through the through hole of the fixed perforated plate located on the downstream side when the fluid flows forward. At this time, since the through holes of both fixed perforated plates are formed in the same shape, it is possible to accommodate the fluid flow in the same manner as in the case of normal flow.

Then, the fluid flowing backward passes through the through hole of the movable perforated plate and flows into the through hole of the fixed perforated plate located on the upstream side in the case of forward flow. Furthermore, foreign matter flows into the bottom of the valve box through the gap between the fixed perforated plate and the movable perforated plate.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
2, a pair of fixed perforated plates 2 and a movable perforated plate 3 are arranged inside the valve case 1 to block the flow path of the valve case.
The movable perforated plate 3 is interposed between both fixed perforated plates 2. The movable perforated plate 3 is formed to have a thickness thinner than the distance between both fixed perforated plates 2, and the retaining groove 5 formed in the upper part is connected to the valve rod 6.
It is engaged with a locking portion 7 formed at the lower end of the holder and supported so as to be able to move slightly in the flow direction of the fluid 4. Therefore, the movable perforated plate 3 is movable in sliding contact with the other fixed perforated plate 2 with a predetermined gap formed between the movable perforated plate 3 and one of the fixed perforated plates 2. Further, water is cut off between the peripheral portion of the fixed perforated plate 2 and the valve box 1 by a sealing material 9.

The fixed perforated plate 2 and the movable perforated plate 3 each have a plurality of through holes 10° and 11 formed in the same pattern to form flow paths for flow rate control. Further, the through holes 11 of the movable perforated plate 3 are formed in a cylindrical shape with a flow passage cross-sectional area of -, and the through holes 10 of the fixed perforated plate 2 are formed in the fixed perforated plate facing the movable perforated plate 3. The diameter of the channel is expanded from the back side of 2 toward the front side, that is, toward the outside so that the cross-sectional area of the flow path becomes larger.

Further, the opening periphery of the through hole IO on the back side of the fixed perforated plate 2 facing the movable perforated plate 3 is formed into a higher annular sliding contact portion 12 . A discharge port 13 is formed at the bottom of the valve box 1, and a stopper 14 is detachably screwed onto the discharge port 13.

Hereinafter, the effects of the above configuration will be explained.

The movable perforated plate 3 receives the urging force of the fluid 4, forms a gap with the fixed perforated plate 2 located on the upstream side, and moves in sliding contact with the fixed perforated plate 2 located on the downstream side. . In a fully open state where the through holes IO of the fixed perforated plate 2 and the through holes 11 of the movable perforated plate 3 completely match, the positive flow of fluid 4 flows through the through holes 10 of the fixed perforated plate 2 located on the upstream side. flows into. At this time, since the diameter of the through hole IO is expanded on the upstream side, pressure loss can be suppressed. Also, the fluid 4 is connected to the movable perforated plate 3
It flows into the through hole IO of the fixed perforated plate 2 located on the downstream side through the through hole II, and flows out from the through hole 10 of the fixed perforated plate 2 to the downstream pipe line.

Then, the movable perforated plate 3 is moved by a distance corresponding to the diameter of the through hole 11, and the through hole 1 of the movable perforated plate 3 and the fixed perforated plate 2 is moved.
The state where 0.11 is completely smoothed is the fully closed state, and the movable perforated plate 3 is moved between the fully open state and the fully open state to open the through hole! The flow rate is adjusted by deviating the positions of the through holes IO of the fixed perforated plate 2 and increasing/decreasing the cross-sectional areas of the flow paths in each of the through holes 10 and 11. Further, foreign matter in the fluid that has flowed into the valve body 1 through the gap between the fixed perforated plate 2 and the movable perforated plate 3 on the upstream side is removed from the flow formed between the sliding contact parts 12 and the sliding contact parts 12. It passes through the passage 15 and remains at the bottom of the valve body 1, and is discharged to the outside of the valve body 1 through the outlet 13 when the stopper 14 is opened. Therefore, the movement of the movable perforated plate 3 is not obstructed by foreign matter that has flowed into the inside of the valve box 1.

When a reverse flow occurs, the movable perforated plate 3 receives the biasing force of the reverse flow and slides into contact with the fixed perforated plate 2 on the upstream side when the flow is normal, and the fixed perforated plate 2 located on the downstream side when the flow is normal. A predetermined gap is formed between the two. Further, the fluid 4a flowing in the opposite direction flows in from the through hole IO of the fixed perforated plate 2 located on the downstream side during the forward flow. At this time, since the through holes 10 of both fixed perforated plates 2 are formed in the same shape, they can accommodate the flow of the fluid 4a in the same way as in the case of normal flow. Then, the fluid 4a flowing backward
passes through the through hole it of the movable perforated plate 3 and flows into the through hole IO of the fixed perforated plate 2 located on the upstream side during normal flow. Also,
Foreign matter flows into the bottom of the valve box through the gap between the fixed perforated plate 2 and the movable perforated plate 3 and the flow path 15.

As shown in FIGS. 3 and 4, the movable perforated plate 21 may be formed of a thin plate, and the through holes 22 may be formed of a cylindrical body 23.

According to this configuration, foreign matter that has flowed into the inside of the valve housing 1 is guided to the bottom of the valve housing 1 through the flow path 24 formed between the cylindrical bodies 23, and the plug is inserted into the valve body 1 at appropriate intervals. When 14 is opened, it is discharged to the outside.

Effects of the Invention As described above, according to the present invention, fixed perforated plates are provided on both sides of a movable perforated plate, and by forming through holes of the same shape in both fixed perforated plates, both forward and reverse flow can be achieved. can correspond to

Furthermore, by forming a gap between the movable perforated plate and the fixed perforated plate, foreign matter that has entered the valve box can be quickly guided to the bottom of the valve case, thereby ensuring smooth movement of the movable perforated plate.

[Brief explanation of drawings]

Fig. 1 is an overall vertical cross-sectional view showing one embodiment of the present invention, Fig. 2 is a partially enlarged view of a movable perforated plate in the same embodiment, and Fig. 3 is an overall longitudinal cross-sectional view showing another embodiment of the present invention. 4 are partially enlarged views of the movable perforated plate in the same embodiment. DESCRIPTION OF SYMBOLS 1...Valve box, 2...Fixed perforated plate, 3...Movable perforated plate, 4...Fluid, 10.11...Through hole, 12...
・Sliding contact part, 13... Outlet, 14... Plug body.

Claims (1)

[Claims] 1. A pair of fixed perforated plates are fixedly installed inside the valve box, and the movable perforated plate is inserted between both fixed perforated plates. A plurality of through holes are movably provided in sliding contact with the other fixed perforated plate with a predetermined gap formed between the perforated plate and the fixed perforated plate and the movable perforated plate to form a flow path for controlling the flow rate. are formed in the same pattern, the through holes of the movable perforated plate are formed in a cylindrical shape, and the passage cross-sectional area of the through holes of the fixed perforated plate increases from the back side facing the movable perforated plate to the front side. What is claimed is: 1. A regulating valve which is formed with an enlarged diameter so as to have a discharge port formed at the bottom of the valve box, and a removable stopper provided at the discharge port.