KR20020084925A - Gate valve - Google Patents

Abstract

PURPOSE: A gate valve having excellent fluid sealability is provided to improve the fluid sealability of a gate valve by preventing the deposition of foreign matters or powder materials between a knife plate and a valve seat and by suppressing the wear of the knife plate and the valve seat. CONSTITUTION: First and second valve seats(30a,30b) are installed in a housing(20). The valve seats stick to a side and a lower end corner surface of a knife plate(10) by expanding with air. A fluid opening(22) in the housing is formed as a flat surface. A fluid passes through the fluid opening. The wear of the valve seat and the deposition of foreign matters or powder materials are prevented effectively.

Description

Gate Valve with Excellent Fluid Sealability {GATE VALVE}

The present invention relates to a gate valve (GATE VALVE) is connected between the fluid pipe to open and close the flow of the fluid as needed, more specifically, the valve is in close contact with the lifting knife plate for sealing the fluid of the gate valve The present invention relates to a gate valve having excellent fluid sealing property as well as preventing seat wear, and in particular, preventing foreign matter or powder in the fluid from accumulating in the housing toward the lower end side of the knife plate to improve the fluid sealing property of the gate valve.

Commonly known gate valve (KNIFE GATE VALVE) is a valve that is connected between the fluid pipe to open and close the flow of the fluid flowing in the fluid pipe as a knife plate moving up and down according to the operation, the operation of the knife plate usually It is also called a knife-type gate valve because the opening and closing of the fluid is performed. Such a knife-type gate valve allows the rising and falling knife plate to be in close contact with the valve seat installed in the valve housing to flow or block the flow of the fluid. It is usually used to control the flow of high-viscosity fluids or powders, such as a mixture of fluids and other substances, or a jelly-like fluid, Figures 1 and 2 show such a general gate valve Doing.

That is, as shown in Figure 1 and 2, the knife plate 130 connected to the lower side of the moving rod 120 to move in the operation of the operation handle 110 is installed to move vertically in the valve housing 140, The valve seat 150 is fixed as a fixing ring 160 that is bolted to the valve housing 140 under the opening 140a formed at the center of the valve housing 140, and a guide ring 170 on the opposite side thereof. This bolt is coupled, the knife plate 130 is in close contact with the valve seat 150 as protrusions 144 formed at intervals of about 120 degrees on the machining surface 142 below the housing opening 140a shown in FIG. 2. .

Accordingly, as the steering wheel 110, which is one of driving means such as a cylinder and a driving motor, is rotated, the knife plate 130 moves vertically in the valve housing 140 and thus comes into close contact with the valve seat 150 when descending. The flow of fluid through the opening 140a is blocked or opened.

However, as shown in FIG. 3, in the general gate valve 100 which controls the flow of the fluid only by the close contact between the integrated valve seat 150 and the knife plate 130, the operation handle (the driving means) The end of the knife plate 130 which is lowered by the operation of 110 is lowered while contacting the valve seat 150, on the contrary, as the valve 100 is raised, when the valve 100 is opened, the friction sheet is brought into considerable contact with the valve seat 150 again. As a result, the valve seat 150 is easily worn, which in turn causes fluid leakage and shortens the life of the gate valve 100.

Therefore, another conventional gate valve 200 for preventing such a valve seat 150 of the gate valve is disclosed in the patent application 10-2000-28316 filed by the present applicant, in FIG. The operating state is shown.

That is, as shown in FIG. 4, the hollow valve seat 250 is fixed as the seat ring 280 between the fixing rings 260 fixed to the valve housing 240, and the seat ring 280 is fixed. While the air is supplied through the air passage A formed in the ring 260, the valve seat 250 is expanded or contracted to minimize the abrasion caused by friction between the knife plate 230 and the valve seat 250 that rise and fall. will be.

However, in the general gate valve 100 shown in FIG. 3 and another conventional gate valve 200 shown in FIG. 4, the knife plates 130 and 230 are lowered to form the valve seats 150 and 250. While close contact allows fluid to be sealed, the housing processing surfaces 142 and 242 where the protrusions 144 and 244 are formed have a concave stepped portion compared to the opposite side where the valve seats 150 and 250 are mounted (Fig. 3 and S) of FIG. 4 are formed.

Therefore, in the stepped portion S, foreign matter contained in the fluid or in particular, in the case of the fluid is accumulated, it is fixed in the stepped portion.

Furthermore, even if the knife plate 130, 230 is lowered by the foreign matter or powder piled up and fixed on the stepped portions of the fixing rings 160 and 260 and the valve seat 150 and 250, the valve seat 150 ( As the close contact with 250 becomes difficult, there is a problem that complete fluid shutoff of the gate valves 100 and 200 cannot be achieved.

As a result, the complete fluid opening and closing of the conventional gate valve 100 and 200 becomes difficult, resulting in a malfunction of the gate valve, which causes a serious problem of degrading product reliability.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned various problems. The first object is to minimize the wear of the valve seat, and in particular, that foreign matter or powder of fluid accumulates between the knife plate and the lower valve seat. It is an object of the present invention to provide a gate valve having excellent fluid sealing properties that can be effectively prevented.

As another aspect of the first object, when the fluid is a powder having a large particle size, only one valve seat is installed to expand and contract so that the number of valve seats can be reduced to prevent the accumulation of powder while reducing costs. It is to provide a gate valve having excellent fluid sealing property.

In addition, the second object of the present invention is to minimize the wear of the valve seat and to prevent the accumulation of foreign matter or powder of the fluid between the valve seat and the knife plate, and in particular, it can be used in both directions regardless of the flow direction of the fluid The present invention provides a gate valve having excellent fluid sealing property that facilitates fluid pipe installation.

In addition, the third object of the present invention is to form the first seat ring for fixing the first valve seat that is in close contact with the side of the knife plate in an integral circle, thereby the seat ring and the fixed ring for fixing the same when using a large gate valve An object of the present invention is to provide a one-way gate valve having excellent fluid sealing property which is easy to process.

Further, a fourth object of the present invention is to provide a bidirectional gate valve having excellent fluid sealing property in which a fluid pipe can be easily installed by enabling use in both directions regardless of the flow of fluid in addition to the third object.

1 is a partial cutaway perspective view showing a general gate valve

2 is a cross-sectional view showing an operating state of a general gate valve

3 is a main part of FIG. 2 showing an operating state between a lower portion of a knife plate and a valve seat of a general gate valve;

Figure 4 shows the operating state of the gate valve having an expansion / contraction valve seat for preventing the wear of the conventional valve seat,

(a) is an essential part of the knife plate and the expanded valve seat when the fluid is shut off

(b) is a main view showing the knife plate and the valve seat contracted when the rapeseed is opened.

5 is a front view showing a first gate valve excellent in fluid tightness according to the present invention;

6 is a front structural view showing a first gate valve of the present invention;

Figure 7 is a front view of the main portion showing the valve seat of the first gate valve of the present invention;

8 shows a first gate valve of the present invention,

(a) perspective view of a partial incision

(b) an exploded perspective view

9 is a view illustrating a coupling relationship between a first valve seat, a first seat ring, and a housing in a first gate valve according to the present invention;

(a) is a front view

(b) side view

FIG. 10 illustrates a coupling relationship between the first and second backup rings, the second valve seat, the second seat ring, and the fixing ring in the first gate valve according to the present invention.

(a) is a front view

(b) is the right side view

11 is a view showing a fixing ring in the first gate valve of the present invention,

(a) is a front view

(b) side view

12 illustrates a first backup ring in the first gate valve of the present invention.

(a) the cross section

(b) front view

(c) side view

FIG. 13 illustrates a second backup ring in the first gate valve of the present invention.

(a) the cross section

(b) side view

14 shows a second seat ring in the first gate valve of the present invention,

(a) the cross section

(b) side view

15 shows a first seat ring in the first gate valve of the present invention,

(a) the cross section

(b) side view

16 is a main structural diagram showing a second gate valve of the present invention capable of bidirectional fluid shutoff;

17 illustrates a third gate valve of the present invention.

(a) is the front structural diagram

(b) is a front structural diagram showing an air passage

18 is a schematic side view showing a third gate valve of the present invention.

19 is a front structural diagram showing a fourth gate valve of the present invention;

Explanation of symbols on the main parts of the drawings

1,1 ', 100,100' .... 1-4 Gate Valve 10,110 .... Knife Plate

20,120 ... Valve housing 30a, 130a ... First valve seat

30b, 130b .... Second valve seat 40,140 .... Seat ring

50 .... backup ring 60,160 .... retaining ring

A1, A2 .... Air passage

As a technical configuration for achieving the first object as described above, the present invention, a vertically moving knife plate, a valve housing formed with a fluid opening that is opened and closed in accordance with the movement of the knife plate, and in close contact with the knife plate It includes a valve seat for blocking the fluid flow,

The valve seat is composed of first and second valve seats which are installed in the housing so as to be expandable as air so as to be in close contact with one side and the lower edge of the knife plate, the fluid opening is a gate having excellent fluid sealing properties consisting of a flat surface By providing a valve.

Next, the present invention as another technical aspect for achieving the other aspect of the first object, the valve housing is formed with a vertically moving knife plate, a flat fluid opening that is opened and closed in accordance with the movement of the knife plate, and In order to close the fluid flow by being in close contact with the knife plate, by providing a gate valve excellent in fluid sealing property consisting of a valve seat is installed in the housing expandably as air to the bottom edge surface of the knife plate.

In addition, the present invention as a technical aspect for achieving the second object, according to claim 1, wherein the valve seat is a pair installed in the housing so as to be expandable as air close to both sides and the bottom edge surface of the knife plate. By providing a gate valve consisting of the first valve seat and the second valve seat.

Next, in order to achieve the third object of the present invention, the present invention provides a vertically moving knife plate, a valve housing having a flat fluid opening that opens and closes according to the movement of the knife plate, and the knife plate is in close contact. First and second valve seats mounted to the first and second seat rings securely fixed to the housing so as to be inflated as air in close contact with one side and bottom edge surfaces of the knife plate to block fluid flow;

The first seat ring is fixed to the housing, and the second seat ring is provided by providing a gate valve excellent in fluid tightness that is mounted to the fixed ring fixed to the housing.

Finally, the present invention as a technical aspect for achieving the fourth object, according to claim 13, wherein the valve seat is a pair of first and second sides of the knife plate to be expandable as air close to both sides of the knife plate. By providing a pair of 1st valve seat provided as a 1st ring, and the gate valve excellent in fluid sealing property comprised as a 2nd valve seat provided as a 2nd seating ring in close contact with the lower edge surface of the said knife plate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 to 7 show a first gate valve 1 according to the invention, which is located in the sleeve 14 so as to move largely as an operating handle 12. A valve housing having a knife plate 10 connected to the lower portion of the moving rod 14a to vertically block the flow of the actual fluid, and a fluid opening 22 that opens and closes according to the movement of the knife plate 10. 20) and the valve seat 30 in close contact with the knife plate 10 to block the fluid flow.

However, FIG. 7 illustrates the valve seat 30 in more detail, and the valve seat 30 according to the gate valve 1 of the present invention has one side surface of the knife plate 10. The first and second valve seats 30a and 30b may be divided into the first and second valve seats 30a and 30b which are installed in the housing 20 so as to be inflated as air A to closely contact the 10a and the lower edge surface 10b.

In addition, FIG. 8 illustrates the first and second valve seats 30a and 30b as a perspective view, which will be described later in detail, and the first and second valve seats 30a are side surfaces of the knife plate 10. In close contact with the inflation with 10a, the second valve seat 30b is in close contact with the bottom edge face 10b of the knife plate 10, and the lower end of the knife plate 10 is described below. The diameter of the lower end portion is formed smaller than the overall width of the knife plate 10 so as to improve the adhesion with the second valve seat 30b.

In particular, as shown in FIGS. 8B and 9B, the second valve seat (at the inclined portion of 45 degrees in FIG. 9B) at both front ends of the second seat ring 40b to which the second valve seat 30b is fixed. 30b) is formed so as not to protrude above the second seat ring 40b, which is pressed when the bottom edge surface 10b of the knife plate 10 is in close contact with the valve seat 30b which is a rubber seat. This is because the knife plate 10 is in close contact with one side of the second sheet ring 40b made of metal.

That is, in FIG. 9, the lower edge surface 10b of the knife plate 10 and the second valve seat 30b are in close contact with each other. The lower edge surface 10b of the knife plate 10 is formed of an arc-shaped material. 2 is formed to correspond to the second valve seat (30b) in close contact with the valve seat (30b).

In addition, FIG. 9 illustrates a state in which the second valve seat 30b mounted to the lower portion of the housing 20 is fixed as the second seat ring 40b inside thereof, and the second seat ring 40b is It is formed in a T-shape as a whole and the valve seat 30b surrounds the head part H part, and the said 2nd valve seat as the housing 20 surface of one side and the 2nd backup ring 50b shown in FIG. It is seen that 30b is fixed, and according to FIG. 9, the second valve seat 30b can be easily attached and detached from the gate valve 1 of the present invention.

Next, FIG. 10 illustrates a fixed state of the first valve seat 30a. The valve seat 30a is determined on one side of the knife plate 10, that is, one side surface 10a determined according to the flow direction of the fluid. In contact with the second valve seat 30b described above, its head is fixed at right angles.

That is, as shown in Figures 9 and 10, the lower portion (60b) of the fixing ring 60, the second backup ring (50b) is fixed to the bolt (B) in the inner side of the housing 20, the bolt ( B) is fixed. At this time, before the lower portion of the fixing ring 60b is fixed, firstly, the first backup ring 50a having the contact surface that is actually inclined with the second backup ring 50b is first surrounded by the first valve seat. Fixing the first seat ring (40a) having a head portion (H1) is wrapped (30a), the first seat ring (40a) through the first backup ring (50a) is the upper portion of the fixed ring (60) It can be seen that the first valve seat 30a is fixed to and detached like the second valve seat 30b by being fixed as the bolt B passing through 60a).

That is, the first and second valve seats 30a and 30b of the present invention are simply assembled at the time of assembling the actual valve, and can be easily disassembled when necessary, so that they are easy to use.

Next, FIG. 11 shows a fixing ring 60 according to the present invention. The fixing ring 60 is divided into an upper portion 60a and a lower portion 60b from the front, but the seat ring 40 and the backup ring. It is an integral ring structure that is not separated like 50, but fixed to the outside of the housing of the valve 1.

However, such a fixing ring 60 is fixed to the first backup ring (50a) in the upper portion, the second backup ring (50b) in the lower portion to facilitate the assembly and disassembly of the valve as a whole.

Next, FIG. 12 illustrates the second backup ring 50b of the gate valve 1 of the present invention in detail. As shown in FIG. 12B, the second backup ring 50b is formed at an angle of more than a semicircle. As described above, the second valve seat 30b must be in close contact with the bottom edge surface 10b of the knife plate 10.

Next, FIG. 13 illustrates a first backup ring 50a. The first backup ring 50a is formed in an L shape so that the first seat ring 40a may be seated and fixed inward. As illustrated in FIG. 12, the first backup ring 50a is formed in an arc shape at an angle smaller than that of the semicircle in contact with the second backup ring 50b.

Next, FIGS. 14 and 15 show a second seat ring 40b and a first seat ring 40a, and the features of the second and first seat rings 40b and 40a are outlined, respectively. When the air seat A is supplied while the valve seats 30b and 30a are wrapped, the head portions H1 and H2 are formed integrally to expand the valve seat 30b.

14, 15, and 7, the second and first seat rings 40b and 40a supply air A, which is a feature of the present invention, to provide the second and first valve seats ( Air passages A2 and A1 for inflating 30b and 30a are integrally formed. The air passages A2 and A1 are formed in the lower portion of the housing 20 which fixes the seat rings 40. It penetrates through the 20b, the 1st backup ring 50a, and the upper part 20a of the housing 20 integrally.

In addition, as shown in Figures 5 and 6, the air passage (A1) (A2) as described above, the supply pipe connected from the air supply unit (U) mounted on the upper sleeve 14 side of the valve (1) (C) is connected as a nipple (N), and although not shown in detail in the drawing, the unit (U) is operated electronically to supply air (A) for rapid air supply according to the operation of the gate valve (1). The solenoid valve to control the

In addition, as shown in FIG. 7, an important feature of the present invention is that the housing 20, the backup ring 50, and the fixing ring are prevented from accumulating foreign matter or powder in the fluid opening 22 through which the actual fluid flows. The fluid opening 22 formed by the inner circumferential surface of 60 should be formed as a flat surface.

Meanwhile, as shown in FIG. 7, the first and second valve seats 30a and 30b are disposed between the first and second seat rings 40a and 40b to expand as supplied air A. FIG. It is formed of a rubber sheet wrapped in the head (H1) (H2) of the first and second seat rings 40 to form the hollow portion (32a) (32b).

And, as shown in Figure 7, between the fixing ring upper portion (60a) and the housing 20, the upper portion (20a) of the sealing to prevent the leakage of air (A) supplied through the first air passage (A1) ( 70) is configured to be mounted.

In this case, reference numerals h and h ', which are not described, are angular bolt through holes and thread grooves, and A denotes air to be injected.

Referring to the operation of the first gate valve 1 of the present invention having the above configuration in detail as follows.

In FIG. 7, the overall configuration of the first gate valve 1 according to the present invention is illustrated, and the operation of the first gate valve 1 according to the present invention will be described as follows. The second shown in FIG. 16 is as follows. The gate valve 1 'and the first gate valve 1 shown in FIG. 7 are a bidirectional gate valve 1' irrespective of which direction the fluid flows and a one-way gate valve 1 having a constant flow direction of the fluid. Since the operation according to the basic configuration is the same as the one-way gate valve 1 or the two-way gate valve 1 ', the operation of the one-way gate valve 1 will be described.

5 and 6, first, the appearance and overall configuration of the first gate valve (1) is shown, the gate valve (1) is connected between the fluid pipe (not shown), the worker manually if necessary As in the present invention, by rotating the operation handle 12 to lower or raise the knife plate 10, the flow of fluid is normally blocked when the knife plate 10 is lowered, the valve when the knife plate 10 is raised The fluid opening 22 of (1) is opened, and fluid flows, The cylinder 12 or the motor-driven type not shown in the figure which installs the handle 12 which is operated manually by an operator according to the frequency of flowing or blocking a fluid, etc. In order to manipulate the vertical movement of the knife plate 10, in the fluid pipe in which the opening and closing operation of the valve is frequently variable it is installed to operate in the cylinder or motor drive type It would be preferable.

Next, as shown in FIG. 7, when the knife plate 10 starts to descend in the initial rising position, the first valve seat 30a in close contact with the one side surface 10a of the knife plate 10 is not expanded. While not in the initial state, when the lowering of the knife plate 10 is completed, it is expanded as air (A) supplied to close the adhesiveness with the knife plate 10 to increase the fluid tightness.

As a result, when the knife plate 10 moves, the first valve seat 30a sealing the side surface 10a of the knife plate 10 is cut off from the supply of air, and the side surface of the knife plate 10 is minutely spaced. After being spaced apart, it is to eliminate the time to be expanded and rubbed by the supply of air (A) at the time when the lowering of the knife plate 10 is completed.

Next, as shown in FIGS. 8 and 9, the second valve seat 30b, which is in close contact with the bottom edge surface 10b of the knife plate 10 and substantially affects the fluid tightness, also has the knife plate 10. When the edge surface 10b is brought into close contact with the upper surface of the second valve seat 30b, the air A is supplied to close the contact state between the knife plate 10 and the second valve seat 30b. In particular, as shown in Figure 9 so that the lower end of the knife plate 10 is closely seated on the second valve seat (30b), the valve contact portion is formed with a diameter smaller than the width of the knife plate 10 It would be desirable to have one.

Accordingly, the side surface 10a and the bottom edge surface 10b of the knife plate 10 are tightly blocked by the fluid while expanding as needed by the first and second valve seats 30a and 30b, thereby providing a fluid tightness. To increase.

By the way, the second valve seat (30b) in close contact with the lower edge surface (10b) of the knife plate 10 as in the present invention to make the fluid opening 22 is a flat surface when viewed in cross section, such a fluid opening As shown in Fig. 2, the flatness of 22 is considerably removed because it eliminates the stepped portion S formed in the housing processing surface 142 when only one valve seat 150 or 250 is conventionally used. It is important to prevent the foreign matter or powder contained in the fluid from being stuck in the stepped portion (S).

Therefore, as shown in FIG. 7, when the knife plate 10 is raised, the lower portion of the fluid opening 22 is flat, and thus foreign matter or powder is not caught and stuck to the fluid, so that the fluid is blocked by the knife plate 10. It is to improve the sealing property further.

In addition, the valve seats 30 are formed of rubber sheets wrapped in the head portions H1 and H2 of the first and second seat rings 40a and 40b for the expansion of the valve seats 30. The hollow portions 32a and 32b formed in between the seatings facilitate the expansion operation of the valve seats 30 when the air is supplied, and return to the initial position, that is, the retracted position, when the supply of air is stopped. Be sure to

Meanwhile, although all the bolts are illustrated as B in the drawing, the fixing ring 60 has two fixing parts to the lower portion 20a of the housing 20 and a first seat ring 40a through the first backup ring 50a. Two fixed to the coupled to the inside of the lower portion (60b) of the fixing ring 60 is coupled two bolts (B) for fixing the second backup ring (50b), such bolts (B) in the drawing It passes through the through hole of h indicated and overlaps with the screw grooves indicated by h '.

Then, the first backup ring 50a is fixed while being in close contact with the contact surface to the upper side of the second backup ring 50b. In this case, as shown in FIG. 8, the first valve seat 30b and the first valve seat 30b are fixed. 2 When the boundary of the valve seat 30a is formed to be inclined approximately 45 degrees, foreign matter or powder is not caught and comes down along the interface when the flow of fluid is performed to prevent accumulation of foreign matter or powder.

On the other hand, when the fluid is a powder having a large particle size, it is easier to block the flow of the fluid as compared to a liquid fluid, a gas, or a powder having a fine particle size, and as shown in FIGS. 8A and 8B, the first gate Without installing the first valve seat 30a in close contact with the side of the knife plate 10 in the valve 1, although not shown in the drawing, a conventional metal seat is in close contact with the side of the knife plate 10. 20), and only one valve seat, that is, the second valve seat 30b, can be installed as expandable as air A, thereby effectively controlling the flow of powder having a large particle size. In this case, the first valve seat It would be desirable to eliminate the need for the respective seating rings, backing rings, etc., 30a, and to secure them, thus reducing the manufacturing cost of the valve 1 itself.

By the way, the most problematic part in the case of powder having a large particle size, as described in the prior art portion, the lower edge surface (10b) portion of the knife plate 10 and the valve seat (30b) side of the processing surface portion of the housing Since the fluid accumulates, when the fluid opening 22 is formed flat to eliminate the step and the valve seat 30b that expands and contracts as air is installed, the fluid is surely prevented from accumulating.

Of course, if the size of the fluid pipe to which the gate valve 1 is installed is small or if it simply blocks the flow of the fluid and no pressure is applied to the fluid, or if the fluid is a liquid, a gas or a small particle, If the pipe line is not a problem, it would be desirable to reduce the component cost of the gate valve by installing only the second valve seat 30b, but its use range will be limited except in the case of powder having a large particle size.

Next, FIG. 16 shows a second gate valve 1 'according to the present invention, which is characterized by a pair of first valve seats 30a and 30a'. ) And one second valve seat 30b so that the first valve seat 30a0 (30a ') comes into close contact with both sides 10a and 10a' of the knife plate 10 at the same time, so that the direction of fluid flow Regardless of whether the gate valve (1 ') can be connected between the fluid piping.

That is, the second gate valve 1 'is a bidirectional gate valve 1', and the pair of first valve seats 30a and 30a 'has a pair of retaining rings 60 at both sides of the knife plate 10. 60 'and a pair of first seat rings 40a and 40a' coupled through a pair of first backup rings 50a and 50a 'fixed inwardly to both sides of the knife plate 10 10a) is fitted in close contact with 10a '.

Therefore, when the knife plate 10 is lowered, the air A is supplied to the first valve seats 30a and 30a 'through the first air passages A1 and A1' to expand and expand the knife plate 10. In close contact with both side surfaces 10a and 10a 'and at the same time, the lower second valve seat 30b also expands as described above, so that the second gate valve 1' tightly holds the fluid regardless of the direction of the fluid flow. On the contrary, when the knife plate 10 rises to open the fluid opening, the pair of first valve seats 30a and 30a 'and the second valve seat 30b contract and the knife plate 10 Friction with the valve) can be avoided, which prevents wear of the valve seat.

Next, FIGS. 17 and 18 illustrate a third gate valve 100 of the present invention. The third gate valve 100 is characterized in that the first gate is in close contact with the knife plate 110 while expanding. The first seat ring 40a formed at a smaller angle than the semicircle in the first and second gate valves 1 and 1 'by forming the valve seat 130a and the first seat ring 140a in a single circle. Compared to the 40a 'to facilitate the machining operation, the third gate valve 100 is suitable for a substantially large valve, which is the first valve seat 130a and the second valve seat ( This is because the portion where 130b) contacts occurs.

At this time, the same configuration as that of the 1-2 gate valve 1 is indicated by a code of 100 units.

That is, as shown in FIGS. 17 and 18, the valve housing 120 having the knife plate 110 vertically moving, and the fluid opening 122 opening and closing according to the movement of the knife plate 110 are formed. And, the valve seat 130 is in close contact with the knife plate 110 to block the fluid flow, such a valve seat 130, one side (110a) and the lower edge surface ( To the first and second valve seats 130a and 130b mounted to the first and second seat rings 140a and 140b that are securely fixed to the housing 120 as air (A) in close contact with 110b). consist of.

In this case, in the third gate valve 100, the second seat ring 140b to which the second valve seat 130b is fixed is not connected to the housing 120 without the need for the first and second backup rings 50a and 50b. The first valve seat 130a is fixed to the first seat ring 140a fixed to the fixing ring 160 fixed to the housing 120, and the respective housing 120 and the fixing ring ( The fluid opening 122 formed by the 160 is formed as a flat surface, and thus the accumulation of the fluid foreign matter or powder described above is prevented.

Meanwhile, as shown in FIGS. 17 and 18, the first seat ring 140a may be formed of a ring portion 140a having a smaller angle than a semicircle forming a space 132a between the first belt seat 130a and the first seat ring 140a. 1 The extended ring portion 140a1 of an angle larger than a semicircle that does not form a space between the valve seats 130a is integrally formed in a single ring shape, and the first valve seat 130a which is circular in shape is mounted on the knife. One side surface 110a of the plate 110 is in close contact with the side of the second valve seat 130b.

In addition, a first air passage A1 for supplying air A into the first seat ring 140a and the fixing ring upper portion 160a to inflate the first valve seat 130a. Is integrally formed through the second air passage (A2) for supplying air (A) for expanding the second valve seat (130b) in the lower portion of the second seat ring (140b) and the housing 120 Should be integrally formed through,

In addition, a seal 170 that prevents leakage of air is interposed between the housing 120, the upper portion of the fixing ring 160a, and the second seat ring 140b and the housing 20, respectively. Leakage can be effectively blocked.

Therefore, in the third gate valve 100 as described above, the expansion of the first and second valve seats 130a and 130b through the air passages A1 and A2 extends to the first and second gate valves 1. Although similar to 1 ', the first valve seat 130a has a circular shape, so that the contact area with the knife plate 110 is larger, and thus, the first valve seat 130a is preferably used for the large-capacity gate valve 100.

Next, FIG. 19 illustrates a fourth gate valve 100 'of the present invention. The fourth gate valve 100' of the present invention is characterized in that the flow of fluid is similar to that of the second gate valve 1 '. Irrespective of providing a bidirectional large-capacity gate valve 100 ', the same configuration as that of the third gate valve 100 is denoted by the same reference numeral.

That is, the valve seat 130 is a pair of first seat rings 140a on both sides of the knife plate 110 so as to be expandable as air A so as to be in close contact with both sides 110a and 110a 'of the knife plate 110. A pair of first valve seats 130a and 130a 'installed as a valve 140a' and a second valve seat 130b to be in close contact with the lower edge surface 110b of the knife plate 110. It consists of two valve seats (130b).

As a result, since the pair of first valve seats 130a and 130a 'are in close contact with both sides of the knife plate 110 to block the flow of fluid, the pair of first valve seats 130a and 130a' is integrated as a pair of first valve seats 130a and 130a '. Valve operation is possible regardless of the flow of the fluid, and in addition, the second valve seat 130b seals the lower edge surface 110b of the knife plate 110 to block the fluid flow.

Accordingly, according to the first to fourth gate valves 1, 1 ', 100, and 100' of the present invention, the wear of the valve seat which actually determines the fluid tightness of the gate valve is minimized, and the fluid opening ( 22 is formed into a flat surface to prevent foreign matter or powder from being caught, and the valve seats 30 and 130 closely adhere to the side and bottom edges of the knife plate 10, thereby providing In addition to further improving the fluid tightness, the one-way (1) 100 or the two-way gate valve (1 ', 100') can be installed to make the installation of the gate valve in the fluid pipe extensive and easy to use. .

As described above, according to the first gate valve of the present invention, there is an advantage of extending the life of the valve by first minimizing wear of the valve seat which determines the fluid tightness of the gate valve.

Further, by forming the opening portion through which the fluid of the gate valve passes, the foreign matter or powder of the fluid does not accumulate between the valve seat and the peripheral parts when the knife plate descends, further improving the fluid sealing property of the gate valve by the knife plate. Has an excellent effect.

Furthermore, in the case where only the second valve seat is installed in the first gate valve, since only one inflatable valve seat is installed while stably controlling the flow of fluid having a large particle size, it is possible to reduce the component cost. do.

And, according to the second gate valve of the present invention, by providing a second valve seat for the side sealing of the knife plate on both sides of the knife plate, providing a gate valve to be installed irrespective of the direction of the fluid to apply to the fluid of the bidirectional flow By doing so, it is to provide an excellent effect that is easy to design and manufacture a plant such as a fluid pipe.

In addition, according to the 3-4 gate valve of the present invention, by forming the first valve seat in close contact with the side of the knife plate and the first seat ring for fixing it in a circular integral form, seat ring in the manufacture of a substantially large capacity gate valve It is to provide an excellent effect to facilitate the processing of the.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (16)

Knife plate 10 for vertical movement; and, A valve housing 20 in which a fluid opening 22 is opened and closed according to the movement of the knife plate 10; And, The valve seat 30 is in close contact with the knife plate 10 to block the fluid flow, The valve seat 30 is installed on the housing 20 so that the valve seat 30 is expandably as air A so as to be in close contact with the one side surface 10a and the lower edge surface 10b of the knife plate 10. 30a and 30b, the fluid opening 22 is a gate valve excellent in fluid sealing, characterized in that consisting of a flat surface According to claim 1, wherein the first and second valve seats 30 are fixed to the outside of the seat ring 40 is fixed between the housing 20 and the backup ring 50, the backup ring 50 is the housing It is supported as a fixed ring 60 is fixed to (20), the valve seat 30 is fixed to form a hollow portion 32 between the seat ring 40 to be expanded as the supplied air (A) Gate valve, characterized in that consisting of a rubber seat The method according to claim 2, wherein the first seat ring (40a) for fixing the first valve seat (30a) and the first backup ring (50a) for fixing it and a fixing ring (60) for fixing it to the housing 20 and , The first air passage (A1) for supplying the air (A) for inflating the first valve seat (30a) is integrally formed inside the housing upper end portion (20a) that the fixing ring 60 is in contact with Gate valve, characterized in that The first valve seat 30a, the first seat ring 40a, and the first backup ring 50a are formed in an arc shape at an angle smaller than a semicircle, and the upper portion of the first fixing ring 60a is formed. Gate valve, characterized in that the sealing 70 is installed between the upper portion (20a) of the housing 20 and the leakage of the air (A) supplied through the first air passage (A1) According to claim 3, The first seat ring (40a) is coupled to the fixing bolt (B) inserted through the upper portion (60a) and the first backup ring (50a) of the fixing ring 60 is coupled to the first sheet The gate valve, characterized in that the ring 40a, the first backup ring 50a and the fixing ring upper part 60a are mounted in the housing 20 in order to be detachably attached. The lower valve 20b of claim 2, wherein the second seat ring 40b for fixing the second valve seat 30b and the lower portion 20b of the housing 20 in contact with the second seat ring 40b are disposed in the second valve ring. A gate valve, characterized in that the second air passage (A2) for supplying the air (A) for inflating the seat (30b) is formed to be integrally communicated with The second valve seat 30b, the second seat ring 40b, and the second backup ring 50b are formed in an arc shape at an angle greater than a semicircle, and the second valve seat 30b. Is fixed to the second seat ring (40b) is a gate valve, characterized in that it is detachably mounted in the housing 20 as a second backup ring (50b) is fixed to the housing (B) bolt (B) The housing (20) according to claim 1, wherein the valve seat (30) is expandable as air (A) in close contact with both side surfaces (10a) (10a ') and the bottom edge surface (10b) of the knife plate (10). Gate valve, characterized in that consisting of a pair of first valve seat (30a) (30a ') and the second valve seat (30b) installed in the The pair of first valve seats (30a) (30a ') is a pair of retaining rings (60, 60') and a pair of first fixed to both sides of the knife plate (10). And a pair of first seat rings 40a and 40a 'coupled through the backup rings 50a and 50a' so as to be closely attached to both sides 10a and 10a 'of the knife plate 10. Gate valve Knife plate 10 for vertical movement; and, A valve housing 20 in which a flat fluid opening 22 is opened and closed as the knife plate 10 moves; And, In order to be in close contact with the knife plate 10 to block the fluid flow, the valve seat is installed in the housing 20 to be expandable as air (A) in close contact with the bottom edge surface (10b) of the knife plate ( Gate valve excellent in fluid sealing, characterized in that consisting of 30b) 11. The valve seat (30) according to claim 10, wherein the valve seat (30b) is made of a rubber seat fixed to form a hollow portion (32b) between the seat rings (40) to expand as air (A), Supplying air (A) to inflate the valve seat (30b) to the seat ring (40b) for fixing the valve seat (30b) and the lower portion (20b) of the housing 20 in contact with the seat ring (40b) Gate valve characterized in that the air passage (A2) is formed to be integrally communicated 12. The seat ring (40b) of claim 11, wherein the valve seat (30b), the seat ring (40b), and the backup ring (50b) are formed in an arc at an angle greater than a semicircle, and the seat ring (40b) to which the valve seat (30b) is fixed. Is a backup valve 50b fixed to the lower part of the housing 20b as a backup ring 50b. Vertically moving knife plate 110; And, A valve housing 120 in which a flat fluid opening 122 is opened and closed as the knife plate 110 moves; And, In close contact with the knife plate 110 to block the fluid flow to the housing 120 to be expandable as air (A) in close contact with one side (110a) and the bottom edge surface (110b) of the knife plate (10). First and second valve seats 130a and 130b mounted to the first and second seat rings 140a and 140b to be fixed, The first seat ring 140a is fixed to the housing 120, and the second seat ring 140b is mounted to the fixing ring 160 fixed to the housing 120. Gate valve The method according to claim 13, wherein the first seat ring (140a) is between the ring portion 140a and the first valve seat (130a) at an angle smaller than a semicircle forming a space (132a) between the first belt seat (130a) An elongated ring portion 140a1 of an angle larger than a semicircle that does not form a space therein is integrally formed in one ring shape, and the first valve seat 130a mounted thereon is connected to one side 110a of the knife plate 110. Gate valve, characterized in that configured to be in close contact with the side of the second valve seat (130b) The first air passage A1 for supplying air A for inflating the first valve seat 130a is integrally formed in the first seat ring 140a and the fixing ring upper portion 160a. A second air passage A2 is formed through the second seat ring 140b and the lower portion of the housing 120 to supply air A for expanding the second valve seat 130b. The gate valve is characterized in that the sealing 170 is interposed between the housing 120 and the fixing ring upper portion 160a, and the second seat ring 140b and the housing 20, respectively. 14. The valve seat (130) of claim 13, wherein the valve seat (130) is provided on both sides of the knife plate (110) so as to be expandable as air (A) in close contact with both sides (110a, 110a ') of the knife plate (110). A pair of first valve seats 130a and 130a 'installed as one seat ring 140a and 140a' and a second seat ring 140b to be in close contact with the bottom edge surface 110b of the knife plate 110. Gate valve, characterized in that configured as a second valve seat (130b) installed as