KR200379001Y1 - Knife gate valve - Google Patents

Abstract

Conventional knife gate valve has the biggest disadvantage that the rubber seat damage is severe as the fluid passes through the narrow space at high speed at the last point of closing the knife gate, and the life of the rubber seat is short because it contains impurities or slurry. There is a problem, and there is also a problem that takes too much time and money due to replacement and repair of the damaged rubber seat.

Due to this problem, the present invention has a flow path chamber through which fluid passes in a horizontal direction under the body, and a knife gate for opening and closing a flow path chamber in which the fluid passes vertically is assembled, and the opposite end of the knife gate is formed in the flow path chamber. A rubber seat is embedded, and the knife gate is fixed to the stem through the yoke, the stem and the sleeve formed with the male thread is joined to the center of the handle is fixed on the handle center to open and close by rotating the handle, the flow path By forming a fitting step on one side of the thread and inserting a conical guide tube into the fitting step, the rubber sheet is damaged at extreme speed as the fluid passes at a high speed through the narrow space at the end of the knife gate closing. Has the advantage of minimizing.

Description

Knife Gate Valve {KNIFE GATE VALVE}

The present invention is used in papermaking, ash (ASH), fine powder of less than 0.3㎛, powder, sludge piping system, more specifically, the induction pipe is inserted into one side of the flow chamber chamber of the valve body to smoothly pass the fluid passing through the flow chamber chamber The present invention relates to a knife gate valve (Knife Gate Valve) which allows the knife gate to be prevented from being broken by the speed of the fluid passing through the flow path while simultaneously maintaining the airtightness.

Typically, a knife gate valve is a valve used for controlling flow of powder, paper, fine powder, sludge, and the like and opening and closing of such a piping system.

According to the MSS-SP-81 standard, the leak rate of the knife gate valve is set to 40 cc / min · inch.

As described above, the conventional knife gate valve is composed of a body 10, a support 30, and a knife gate 20 as illustrated in FIGS. 1 to 2.

The support 30 supports the handle 120 and the sleeve 70 on the upper portion and moves the stem 41 up and down to open and close the knife gate 20.

At this time, the square knife gate 20 that moves up and down moves to the rubber seat 11 while the sliding contact movement of the body passes through the packing 60 and plays a role of opening and closing the valve.

However, the valve having the configuration as described above rotates the handle 120 in one direction to lower the knife gate 20 to block the flow of fluid, while the knife gate 20 descends to the lower end of the body 10, the rubber seat The effective space (d) is generated before being in close contact with (11). At this time, since the space in which the fluid flows becomes small, the velocity of the fluid flows rapidly, and the rubber seat 11 embedded in the body 10 is driven by the velocity of the fluid. There is a problem of breakage.

In addition, even if the knife gate 20 is in close contact with the rubber sheet 11, pulp, ash, and powder are deposited between the knife gate 20 and the rubber sheet 11 to prevent complete sealing of the knife gate 20. It may cause leakage.

In other words, as the fluid passes through the narrow space at high speed at the last time when the knife gate 20 is closed as described above, the rubber sheet 11 has the greatest disadvantage, and the impurity or slurry is included and the rubber There is a problem that the lifespan of the seat 11 is shortened, and there is a problem that too much time and cost are required to replace and repair the damaged rubber seat 11.

Accordingly, the object of the present invention is to solve the problems caused by the conventional knife gate valve as described above has the following object.

The object of the present invention is to minimize the maximum disadvantage that the damage of the rubber sheet is severe as the fluid passes through the narrow space at high speed at the last point of closing the knife gate, and to prevent impurities or slurry from being deposited on the rubber sheet, It is an object of the present invention to provide a knife gate valve that ensures maximum airtightness while ensuring a long seat life.

In order to achieve the above object, the present invention has a flow path chamber through which fluid passes in a horizontal direction at the lower part of the body, and a knife gate for opening and closing a flow path chamber in which the fluid passes vertically is assembled. A rubber seat is embedded at the opposite end, and the knife gate has a top end fixed to the stem through the yoke, and a stem and a sleeve formed with a male thread are joined together to be fixed on the center of the handle to open and close the handle by rotating the handle. In the, the fitting step is formed on one side of the flow path chamber, the fitting step has a feature that the conical guide tube is formed.

Hereinafter, with reference to the accompanying drawings will be described in more detail.

3 to 4, FIG. 3 is a cross-sectional view of a state in which an induction pipe is installed in a knife gate valve, and FIG.

That is, in the general structure, a flow path chamber 12 through which fluid passes in a horizontal direction is formed in the lower portion of the body 10 as in the above-described general knife gate valve, and vertically opens and closes the flow path chamber 12 through which the fluid passes. The knife gate 20 is installed.

In addition, a rubber seat 11 is embedded in the flow path chamber 12 in which the knife gate 20 abuts.

The knife gate 20 is fixed to the stem 41 through a yoke 15 fixed to the upper end of the body 10, and the stem 41 and the sleeve 70 formed with a male thread are screwed together.

The sleeve 70 is fixed on the center of the handle 120 so as to rotate in the yoke 15 by rotating the handle 120.

And one end of the flow path chamber 12 is formed with a fitting step 13 around the circumference, the fitting step 13 is a conical guide tube 16 is inserted into the fitting step.

At this time, the fitting step 13 is seated on the base 16a of the guide tube 16, the tapered buoy is coupled to be in close contact with the knife gate 20.

Referring to the operation state and action of the knife gate valve made of the above configuration are as follows.

3 and 4, when the handle 120 is rotated in one direction and the knife gate 20 is lowered to block the flow of fluid, the knife gate 20 moves to the lower end of the body 10. While descending, the effective space d is generated before being in close contact with the rubber seat 11.

At this time, the flow of fluid flows rapidly into the space where the knife gate 20 is narrowed when descending, and the fast flowing fluid flows while gathered inwardly by the induction pipe 16 so that the flow velocity of the fluid is strong by the speed of the fluid. The rubber sheet 11 can be prevented from being damaged.

That is, when the knife gate 20 descends and the flow velocity of the fluid is increased through the narrow space, the induction pipe 16 is tapered in the flow direction of the fluid, so that the fluid is collected inwardly and flows in the induction pipe 16. This rubber sheet 11 is to be protected.

As described above, the fluid flows without directly affecting the rubber seat 11, and thus, there is no problem in that pulp, ash, and powder are deposited between the rubber seats 11, so that the knife gate 20 has a rubber seat 11. ), It can be kept tight when fully

As described above with respect to the present invention, the fitting step is formed on one side of the flow path chamber, and the conical guide tube is inserted into the fitting step, thereby facilitating the flow of the fluid, and at the last time when the knife gate is closed. As the fluid passes through the narrow space at high speed, the maximum disadvantage that the damage of the rubber sheet is severely minimized is minimized, and by preventing the accumulation of impurities or slurry on the rubber sheet, the rubber sheet lasts for a long time and is kept airtight. It is evident that this is a very useful design with the maximum possible effect.

1 is a cross-sectional view for explaining a conventional knife gate valve,

Figure 2 is a part of the extract for explaining the operating state of a conventional knife gate valve,

3 is a cross-sectional view of the guide pipe is installed on the knife gate valve

4 is a partial exploded view for explaining the operating state of the knife gate valve.

<Explanation of symbols for the main parts of the drawings>

10: Body 11: rubber seat

12: Euro room 13: fitting step

16: guide pipe 16a: base jaw

20: knife gate 30: support

41: system 60: packing

70: Sleeve 120: handle

Claims (2)

A flow path chamber 12 through which fluid flows in a horizontal direction is formed under the body 10, and a knife gate 20 for opening and closing a flow path chamber 12 through which fluid passes vertically is assembled. The other end of the stem 20 is embedded with a rubber seat 11 in the flow path chamber 12, the knife gate 20 is fixed to the stem 41 through the yoke 15, and the stem 41 having a male spiral is formed. In the knife gate valve is coupled to the sleeve 70 is fixed on the center of the handle 120 is opened and closed by rotating the handle 120, Knife gate valve is characterized in that the fitting step (13) is formed on one side of the flow path chamber (12), and the guide pipe (16) is inserted into the fitting step (13). The method of claim 1, The guide tube 16 is a knife gate valve, characterized in that made of a conical shape.