JPH04145272A - Gate valve - Google Patents

Abstract

PURPOSE:To discharge dust or the like collecting in a recess groove to the outside of a valve box in a simple manner as well as to eliminate the cause of a water leakage in preventing any possible accumulation by installing a water pipe and a drain pipe, leading to a recess groove, in a side wall part of this recess groove for closing a flow passage as the gate valve element is lowered. CONSTITUTION:A recess groove 13 is installed on a bottom part in a valve box just below a gate valve element 7 so as to make a passage 5 fully closable as this gate valve element 7 is lowered, and a small diametral through-hole 16 and a large diametral through-hole 17, leading to this recess groove 13, are made in each of side wall parts 14, 15 of the recess groove 13 so a to be situated in each corresponding position. A water pipe 20 is connected to the small diametral through-hole 16, and a drain pipe 23 is attached to the large diametral through-hole 17. Jet water being fed together with compressed air is fed to the water pipe 20, and the washing water is fed into the recess groove 13 in a direction orthogonal with a flow direction of a fluid body, washing out earth and sand, dust or the like collected in the recess groove 13, then it is drained to the outside of a valve box 2 through the drain pipe 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gate valve equipped with a gate valve body that moves up and down in a direction substantially perpendicular to a flow path of a valve box to open and close the flow path.

(Jubai Technique 9 @) In many gate valves of this type, the gate valve body is placed at the bottom of the valve body directly below the gate valve body so that the gate valve body can descend and completely close the flow path. A groove is provided to avoid contact with the lower part. By the way, this ll! In the 1alf, soil, sand, garbage, etc. carried in by the fluid flowing in the flow path tend to accumulate, and these deposits are pressed downward as if being trampled by the gate valve body that opens and closes. Eventually, the above-mentioned (!IrIII) was completely filled up. As a result, the lowering of the gate valve body became obstructed and the flow path could not be completely closed, causing water leakage.

Therefore, in conventional gate valves, screw caps called plugs are provided on both side walls of the groove, and the screw caps are opened as appropriate to scrape out the deposits accumulated in the groove to the outside of the valve box. was.

(Problem to be solved by the invention) However, such scraping work is troublesome and tends to be neglected, and eventually, as mentioned above, the deposits become firmly stuck in the grooves and cannot be scraped out, and eventually the partitions are damaged. This was an insufficient measure against water leakage, as it caused problems with the lowering of the valve body.

This invention was created in view of these deficiencies in the prior art, and its purpose is to easily discharge soil, sand, trash, etc. that accumulates in the groove to the outside of the valve box. Therefore, it is an object of the present invention to provide a gate valve that can prevent the accumulation of water and eliminate the cause of water leakage.

(Means for Solving the Problems) A gate valve according to the present invention has the following configuration in order to achieve the above object. That is, there is a gate valve element that moves up and down in a direction substantially orthogonal to the flow path of the valve box to open and close the flow path, and a partition that allows the gate valve element to descend and completely close the flow path. In a gate valve equipped with a concave groove provided in the inner bottom of the valve box directly below the valve body, a water supply pipe and a drain pipe communicating with the concave groove are provided on the side wall of the concave groove, and a water supply pipe and a drain pipe are Washing water is sent into and passed through the groove, so that dirt, sand, dirt, etc. accumulated in the groove can be discharged out of the valve box together with the washing water.

In addition, the water supply pipe and the drain pipe are provided with a water supply valve and a drain valve that control the supply and drainage of washing water, and these valves are operated before the gate valve body completely closes the flow path. It is preferable that the valve be opened and then closed after completely closing the flow path.

Further, it is preferable that the washing water is jet water that is sent into the groove together with compressed air.

(Function) When flushing water is sent from the water pipe into the groove, soil, sand, and garbage accumulated in the groove are washed away and discharged to the outside of the valve box via the drain pipe.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

A valve body 1 of this gate valve includes a valve box 2 and a valve cover 4 that covers a valve housing chamber 3 formed at an approximately upper center of the valve box 2. The valve box 2 has a circular cross section and has a flow passage 5 formed in the horizontal direction, and a gate valve body 7 connected to the valve shaft 6 so as to move up and down in a direction substantially perpendicular to the flow passage 5. The six-gate valve body 7 is provided with, for example, a hollow shape as clearly shown in FIGS. 2 and 3, and has an annular gunmetal portion forming a peripheral edge with a required slope on one side. 8 is also
The other side is provided with an annular gunmetal portion 9 forming a peripheral edge without such a slope. and,
These annular gunmetal parts 8 and 9 are wedge-shaped and in close contact with annular valve seats 10 and 11 made of gunmetal and attached to the valve case 2 side. Therefore, when the valve shaft 6 is rotated by the operation of an electric drive device (or a manual rotation handle, not shown), the gate valve body 7 moves up and down along the guide grooves 12 formed on both sides of the valve housing chamber 3, thereby opening the flow path. Open and close 5.

Then, in order to allow the gate valve body 7 to descend and completely close the flow path 5, a groove is placed on the inner bottom of the valve box directly below the gate valve body 7 to avoid contact with the lower part of the gate valve body 7. [! I groove 1
3 is provided. II of this concave groove 13! Wall part 14,1
5, I! A small-diameter through-hole 16 and a large-diameter through-hole 17 communicating with the I-groove 13 are opened so as to correspond to each other. A water pipe 20 is connected to the small-diameter through hole 16, and includes a water valve 18, such as an electric valve, and a spare slease valve 19, which can be opened and closed manually. Also, in the large diameter through hole 17, a drain valve 21, which is also an electric valve, is provided.
And a drain pipe 23 is installed, which is equipped with a spare slease valve 22 that can be opened and closed manually. Washing water, preferably jet water sent together with compressed air, is supplied from a water supply source (not shown) to the water pipe 20, and the washing water is concave in a direction perpendicular to the flow direction of the fluid. The water supply valve 18 and the drain valve 21, which open and close the soil, sand, 20 that has been sent into the groove 13 and accumulated in the recess rR13, and the drain pipe 23 to send and drain the washing water, are preferably gate valve bodies. 7 is controlled so that the valve is opened before the flow path 5 is completely closed, and the valve is closed after the flow path is completely closed. Also,
In order to facilitate the conveyance of washing water and the discharge of soil, sand, garbage, etc., the diameters of the water supply pipe 20 and the drain pipe 21 are formed so as to gradually increase continuously, and both pipes 20,
21 may have a structure in which the upper side is horizontal and the bottom ms has a downward slope.

The gate valve body 7 not only completely closes or opens the flow path 5, but may also be used in a state where it is not fully opened, such as half-open, in order to adjust the flow rate.

In such usage conditions where the gate valve body 7 is not fully opened, the fluid hits the gate valve body 7 violently and rattles the valve body 7.
During use over a long period of time, scratches occur on the valve body 7 or the valve body 2, particularly on the valve seats 10, 11, and eventually water leaks from these scratches even when the gate valve body 7 is completely closed. In order to prevent such water leakage from occurring, a valve body vibration prevention mechanism P is provided.

In the following, this valve body deflection prevention mechanism P will be described in detail. The mechanism P is provided on the inlet side of the flow path 5, and the hydraulic sill 24, which is its driving device, extends horizontally from the upper center of the outer wall of the valve box 2. It is fixed on one side of an extended base 25 via a stand 26 in an inverted state. The rod head 27 of this hydraulic sill 24 is connected to a lever 29 attached to one end of a drive shaft 28. Drive shaft 2
8 is pivotally supported at one end by a bearing 30 fixed on one side of the base 25, and the other end is
A bearing provided inside the side cover 32 extends into the opening 31 (fixed on the other side of the base 25).
Therefore, it is rotatably supported. A lever 34 is attached to the other end of the drive shaft 28. The lever 34 is connected to a through hole 35 made in the upper center of the valve box 2.
It extends into the valve box 2 via the valve body 2, and a holding member 36 is connected to the lower end thereof.

The holding member 36 extends parallel to the direction of the flow path 5, and its tip portion can face the side surface of the gate valve body 7, and a guide groove 37 is provided in the longitudinal direction of both measuring lengths. It is formed. As clearly shown in FIG. 3, the side guide claws 39 of the guide member 38 fixed to the upper inner wall of the valve box 2 fit into the guide groove 37 and slide the holding member 36. It is movably supported. 40 and 41 are
A bushing and a gland packing are housed in the housing 31, and 42 is a gland packing holder.

Thus, when the hydraulic cylinder 24 is actuated and its piston rod extends, the lever 29, the drive shaft 28 and the lever 3
4, the pressing member 36 moves toward the gate valve body 7, and presses one side of the gate valve body 7 so that it comes into close contact with one of the valve seats 11, and presses one side of the valve body 7 so that the gate valve body 7 comes into close contact with one of the valve seats 11. The gate valve body 7 is clamped and fixed.

The hydraulic sill 24 is configured to stop its operation and release the pressure on the gate valve body 7 by the pressing member 36 when the gate valve body 7 moves up and down.

Further, in the illustrated embodiment, the gate valve body 7 is pressed by one holding member 36, but if the gate valve body 7 is heavy, it may be pressed by a plurality of holding members 36. is desirable.

Next, to explain how to use the gate valve having such a configuration, before the gate valve body 7 is completely closed, for example, when it has closed through the claw, the water supply valve 18 and the drain valve 21 are opened to drain the water. into the groove 13. The washing water washes away soil, sand, garbage, etc. accumulated in the groove 13, and is discharged to the outside of the valve box 2 via the drain pipe 23. By sending flushing water before the gate valve body 7 is completely closed, it is possible to remove dust and the like that may be caught between the valve seats 10 and 11 when the gate valve body 7 is closed.

When the gate valve body 7 is completely closed, the water supply valve 18 and the drain valve 21 are closed to disconnect the supply of washing water.

Of course, in some cases, when the gate valve body 7 is completely closed, the flushing water may be sent to the 4@13.Also, as shown in FIG. In the case where the flow rate is adjusted in the open state, the hydraulic cylinder 24 is operated to drive the holding member 36 forward. The pressing member 36 presses one side of the gate valve body 7 so that it comes into close contact with one of the valve seats 11, and clamps and fixes the gate valve body 7 between the valve seat 11 and the valve seat 11. Therefore, even if fluid collides violently, the gate valve body 7 will not shake, and the gate valve body 7 itself or the valve seats 10 and 11 will not be damaged.

When transitioning the gate valve body 7 from such a half-open state to a fully open or completely closed state, the operation of the hydraulic cylinder 24 is stopped before the gate valve body 7 is moved up and down, and the holding member 36 is moved as shown in FIG. Return to the original state as shown,
The pressure on the gate valve body 7 is released.

Note that the present invention is not limited to the configuration of the embodiments described above; for example, the specific structure may be changed such as not forming a wedge-shaped slope in the gate valve body 7, or the water pipe 20 and The configuration of each part can be arbitrarily changed without departing from the spirit of this invention, such as by changing the structure for installing the drain pipe 23.

(Effects of the Invention) As is clear from the above detailed description, according to the gate valve of the present invention, flushing water is passed into the groove directly below the gate valve body, and water is collected in the groove. Dirt, sand, garbage, etc. can be washed away to the outside of the valve box. Therefore, soil, sand, dirt, etc. do not accumulate firmly in the groove, and the gate valve body can always descend to completely close the flow path.
Water leakage can be prevented from occurring.

In addition, water supply and drainage pipes are provided with valves for water supply and drainage that are controlled to open before the gate valve body completely closes the flow path and close after the flow path is completely closed. By doing so, it is possible to remove dust that may get caught between the gate valve body and the valve seat when the gate valve body is closed.

If the washing water is a jet water that is sent into the groove together with compressed air, the soil in the groove will resist the flow of fluid even if the gate valve body is not completely closed. ,
It can wash away sand, dirt, etc.

[Brief explanation of drawings]

FIG. 1 is a front view of the gate valve according to the present invention with the gate valve body open, FIG. 2 is a vertical side view of the gate valve with the gate valve body closed, and FIG. 3 is a front view of the gate valve with the gate valve body closed. FIG. 4 is a partially enlarged sectional view of the provided valve body pre-stopping mechanism, and a longitudinal sectional side view of the gate valve when the gate valve body is in a half-open state. 2...Valve box 5...Flow path 7...Gate valve body 13...Concave groove 14.15...Side wall portion 1
8...Water valve 20...Water pipe 21...Drain valve 23...Drain pipe Patent Applicant: Seibu Shoji Co., Ltd. Representative Patent attorney: Hikaru Hirose
Figure O Figure

Claims (1)

[Scope of Claims] 1) A gate valve element that opens and closes the flow path by moving up and down in a direction substantially perpendicular to the flow path of the valve box, and a gate valve element that descends to completely close the flow path. In a gate valve equipped with a concave groove provided at the inner bottom of the valve box directly below the gate valve body, a water supply pipe and a drain pipe communicating with the concave groove are attached to the side wall of this concave groove, and these conveyance pipes are Washing water is sent into and passed through the groove through a water pipe and a drain pipe, so that soil, sand, dirt, etc. accumulated in the groove can be discharged together with the washing water to the outside of the valve box. gate valve. 2) The water supply pipe and the drain pipe are provided with a water supply valve and a drain valve that control the supply and drainage of washing water, and these valves are arranged such that the gate valve body completely closes the flow path. 2. The gate valve according to claim 1, wherein the gate valve opens beforehand and closes after completely closing the flow path. 3) The gate valve according to claim 1 or 2, wherein the washing water is jet water sent into the groove together with compressed air.