KR100729798B1 - A gate valve for tight shut-off in high pressure fluid system - Google Patents

Abstract

The disclosed high pressure fluid shut-off gate valve is provided with an inlet and an outlet through which fluid enters and exits on both sides, and a dividing passage for dividing the fluid flowing into the inlet to both sides is formed therein, and the fluid passing through the connecting passage is joined. A valve body having a conduit formed therein; A pair of side covers which are coupled to the valve body and have a 'c'-shaped connecting passage therein, through which the fluid passing through the dividing passage is moved, so that the fluids flowing into the joining passage can be symmetrical with each other; A valve member formed in the valve body in a vertical direction of the confluence passage, inserted into the through hole, and lifted to open and close the fluid flowing into the confluence passage; An actuator connected to the valve member to control driving of the valve member; And a valve seat interposed between the valve body and the side cover to prevent leakage of the fluid. According to such a high pressure fluid shut-off gate valve, it is possible to prevent the disk from being pushed regardless of the pressure difference between the inlet and outlet of the fluid flowing into the valve, it is possible to reduce the friction acting when opening and closing the valve.

High pressure fluid, shutoff valve, gate valve

Description

A gate valve for tight shut-off in high pressure fluid system

1 is a cross-sectional view showing a conventional gate valve configuration and internal structure,

Figure 2 is an external perspective view showing a high pressure fluid shut-off gate valve according to an embodiment of the present invention,

3 is a perspective view showing an exploded state of the gate valve shown in FIG.

4 is a perspective view showing an exploded state of a valve member according to an embodiment of the present invention;

5 is a cross-sectional view showing a flow path of a fluid passing through the valve body and the side cover shown in FIG.

6 is a cross-sectional view showing the operating principle of the valve member shown in FIG.

Explanation of symbols on the main parts of the drawings

110: valve body 111: inlet

112: outlet 113: split passage

114: confluence passage 120,130: side cover

121,131: connecting passage 132: surface treatment surface

140: valve member 141a, 141b: disk

142: disc holder 143a, 143b: spring housing

144: stem 150: actuator

170: valve seat S1, S2: dish spring

The present invention relates to a high pressure fluid shut-off gate valve, and more particularly, to control the flow of fluid in a pipe, and easy to open and close to control the flow of high pressure even with a small force of the actuator, The present invention relates to a high-pressure fluid shut-off gate valve that can prevent the leakage of the holding by preventing the disc from occurring due to the disc tightness.

The valve is used to control the flow rate, flow rate, pressure, etc. of the fluid flowing in the pipe, and can be classified into a stop valve, a slew valve, a gate valve, a check valve, and a pressure reducing valve according to the purpose.

The stop valve is for stopping the flow of fluid, which includes a globe valve and an angle valve, for example, a globe valve forms a flange portion with a fluid inlet and outlet, respectively on both sides of the valve body, the inside of the valve body The valve seat is formed on the horizontal line on the horizontal line, and the valve plate for opening and closing the through hole is provided, and the sealing ring such as O-ring or gasket, Teflon is inserted, as well as the valve plate. It is opened and closed by being lifted up and down when it is connected to the handle and the operating rod to rotate the handle.

On the other hand, the gate valve that can be classified as a kind of stop valve, as disclosed in the Republic of Korea Patent Office Utility Model Registration No. 20-0218269, has a body that is connected to the pipe in both sides, the upper plate and the lower plate is inserted into the gasket It relates to a gate valve coupled to the body under a state, the blocking portion connected to the operating rod is slidably provided in the body.

In particular, the gate valve as described above, the blocking portion, both sides of which are inclined surface and the passage is formed in the lower portion of the intermediate plate formed in the recess, the support is provided on both sides thereof, one side surface of the side plate is formed as a protrusion and In addition, a passage is formed at the lower portion thereof, and the stop portion is coupled to the support, and both ends are joined to the other support, respectively, in the tangerine / side plates coupled to both sides of the intermediate plate / both sides of the inner surface of the upper plate and the lower plate. It is provided with the stopper etc. which are installed.

Conventional gate valve is to open and close the flow path as the plate-shaped valve body (gate) is lifted in the body (valve body), the gate need to be designed with a circular cross section to improve the workability and increase the processing precision have.

In addition, it is necessary to ensure sufficient encapsulation so as not to be scratched by hard particles such as sand mixed in the fluid, and by adopting an elastomeric coating, it is possible to smoothly open and close the operation by reducing the contact friction that may be generated. There is also a need.

In order to meet the various needs as described above, there is a gate valve No. 1985-0002548 in the Utility Model Publication of Korea Patent Office.

As shown in FIG. 1, the gate valve 10 has a cylindrical shape in which the valve box 5 and the valve body 6 which are installed through the flow path 2 of the valve body 1 are narrowed slightly downward. The valve box 5 and the valve body 6 are raised and lowered in the pipe portion 7 extending upward of the valve body 1.

In addition, the valve body 6 as described above is fastened to the screw rod 8, and the screw rod 8 penetrates the tubular cover 3 to the handle 4 to thereby turn the handle 4. At this time, the valve box 5 and the valve body 6 are lifted from the position of the flow path 2 of the valve body 1 to the position of the pipe portion 7 by the treatment with the screw rod 8.

By the way, the conventional gate valves, such as the contact surface is damaged or the seal is broken due to the friction on the contact surface during opening and closing, the sealing efficiency is lowered, and thus there is a problem such that air or foreign matter is introduced into the valve, As the repeated compression load is applied to the sealing surface in accordance with the continuous operation of opening and closing to maintain the complete sealing in the system, the contact surface between the seat surface and the valve body is shortened due to the local damage caused by the repeated compression force. .

In addition, there is a problem that the fluid is adsorbed / accumulated on the inner surface of the valve or the contact surface with the working plate, thereby preventing the complete sealing of the valve plate and causing pulsation by failing to release the instantaneous pressure of the fluid.

In addition, since the flow path of the fluid is straight in the same direction as the pipe, the gate valve is pushed toward the outlet by the pressure difference between the inlet and the outlet of the fluid, making it difficult to secure the airtightness of the inlet.

The present invention has been made to meet the conventional needs as described above, the object of the present invention is to improve the responsiveness of valve opening and closing even under high pressure operating conditions, to maximize the valve sealing effect and efficient blocking of high pressure fluid, In addition, regardless of the pressure difference between the inlet and outlet of the fluid to prevent the disk from being pushed toward the outlet to provide a high-pressure fluid blocking gate valve that can maintain the airtight.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. In addition, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

In order to achieve the above object, the high-pressure fluid blocking gate valve according to the present invention includes an inlet and an outlet through which fluid flows in and out of both sides, and a split passage for branching and flowing the fluid flowing into the inlet is formed therein. A valve body formed with a confluence passage through which the fluid passing through the connection passage is joined; A pair of side covers coupled to the valve body and having a 'c'-shaped connection passage therein for moving the fluid passing through the dividing passage so that the fluids flowing into the confluence passage can be symmetrical with each other; ; A valve member formed in the valve body in a vertical direction of the confluence passage, inserted into the through hole, and lifted to open and close the fluid flowing into the confluence passage; An actuator connected to the valve member to control driving of the valve member; And a valve seat interposed between the valve body and the side cover to prevent leakage of the fluid.

Here, the valve member and the disk to block the flow of the fluid; A disk holder coupled to the disk to fix the disk; A stem fastened vertically through the disk holder; And a fixing member for fixing the stem, wherein a hole is formed in the disk so that the same pressure acts on the inside and the outside of the disc, and the area of the disc coming into contact with the inflowing fluid has a smaller area than that of the facing face. It is desirable to be able to compensate.

In addition, the valve member is interposed between the disk and the disk holder, it is preferable that the plate spring is further provided to increase the adhesion between the disk and the side cover by the pressure by the elastic force.

 Also. The surface of the disk which is in contact with the incoming fluid and the surface of the side cover which flows out through the connection passage are mirror-shaped, and it is preferable to perform a stellite surface treatment to reduce the contact compressive stress with the fluid.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the ordinary or dictionary meanings, and the inventors should properly introduce the concept of terms to explain their own invention in the best way. Based on the principle that the definition can be made in a simple manner, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be water and variations.

Figure 2 is an external perspective view showing a high-pressure fluid shut-off gate valve according to an embodiment of the present invention, Figure 3 is a perspective view showing an exploded state of the gate valve shown in Figure 2, Figure 4 according to an embodiment of the present invention 5 is a perspective view illustrating a disassembled state of the valve member, and FIG. 5 is a cross-sectional view illustrating a flow path of a fluid passing through the valve body and the side cover illustrated in FIG. 2, and FIG. 6 illustrates an operation principle of the valve member illustrated in FIG. 4. It is a cross section.

First, referring to FIGS. 2 to 4, the high pressure fluid shut-off gate valve 100 according to an exemplary embodiment of the present invention includes a valve body 110, a pair of side covers 120 and 130, a valve member 140, and an actuator. The heater 150 and the valve seat 160 are provided.

Here, the valve body 110 is provided with an inlet 111 and the outlet 112 to the fluid flow in and out on both sides, the fluid flowing into the inlet 111 is both inside the valve body (110). A split passage 113 branched to flow is formed, and a joining passage 114 through which the fluids passing through the connecting passages 121 and 131 are joined (see FIG. 5) is formed.

In addition, a through hole 115 is formed in the valve body 110 in a vertical direction of the confluence passage so that the valve member 140 to be described later is inserted.

The pair of side covers 120 and 130 are coupled to the valve body 110, and the pair of side covers 120 and 130 are 'c' shaped to move the fluid passing through the split passage 113. Passages 121 and 131 are formed so that the flow directions of the fluid flowing into the confluence passage 114 are symmetrical with each other.

As such, when the flow of the inflowing fluid is symmetrically formed, the opposite directions and the same pressure are applied to the left and right disks 141a and 141b of the valve member 140 to be described later.

Therefore, the disks 141a and 141b may be prevented from being pushed regardless of the pressure difference between the inlet 111 and the outlet 112, thereby making it possible to secure airtightness.

The valve member 140 is inserted into the through-hole 115 formed in the valve body 110, and is lifted in the vertical direction to open and close the fluid flowing into the confluence passage 114.

Here, the valve member 140 includes a disk 141a and 141b, a disk holder 142, a stem 144 and a fixing member 145 and 146.

The disks 141a and 141b block the flow of the fluid flowing into the confluence passage 114, and the disk holder 142 is engaged with the disks 141a and 141b to fix the disks 141a and 141b. The stem 144 is vertically upwardly penetrated through the longitudinal interruption of the disc holder 142, and the fixing members 145 and 146 are fastened to the disc holder 142 to fix the stem 144. Is connected from below.

Lifting of the valve member 140 is operated by the control of the actuator 150 to be described later, which will be described in detail in the control method of the actuator 150.

In addition, holes are formed in the disks 141a and 141b so that the same pressure acts on the inside and the outside of the disks 141a and 141b, and the end surfaces A of the disks 141a and 14b are in contact with the inflowing fluid. The area is smaller than the cross section A1 facing) so that pressure compensation is possible (see FIG. 6).

In more detail, the disks 141a and 141b have holes for pressure equalization so that the pressure between the surface A and the surface A1 acts in the opposite direction and the area of the surface A1 is wide so that the force acting on the surface A1 is increased. It is larger than the force acting on the A surface, and the pressure compensation structure enables the airtightness between the disks 141a and 141b and the side covers 120 and 130 to prevent leakage of the fluid.

In addition, the valve member 140 is a spring housing 143a for receiving the disc springs (S1, S2) and the disc springs (S1, S2) interposed between the disc (141a, 141b) and the disc holder 142. And 143b).

The force applied by the elastic force to the surface A1 by the plate springs (S1, S2) is further added to further increase the adhesion between the disk (141a, 141b) and the side cover (120, 130), the plate spring Since the disk is smoothly moved by the elasticity of S1 and S2, the valve member 140 may be easily driven even with a small force of the actuator 150 to be described later.

The actuator 150 is connected to the valve member 140 to control the up and down driving of the valve member 140.

Operation of the actuator 150 may be driven by conventional pneumatic or hydraulic pressure, but the operation of the actuator 150 as an example of the present invention used a method by pneumatic.

Although not shown, the actuator 150 has an air supply line formed at an upper portion and a lower portion thereof, and a solenoid valve for controlling air to be selectively supplied to each of the air supply lines. It includes a regulator for regulating pressure and a filter for filtering foreign substances contained in air.

If the air is supplied to the upper part of the actuator 150, the air stored in the lower supply line is exhausted to the outside, and the actuator 150 is lowered. On the contrary, the air is lowered to the lower part of the actuator 150. When is supplied, the actuator 150 is raised while the air stored in the upper supply line is exhausted to the outside.

The valve member 140 coupled to the actuator 150 is elevated in the vertical direction by the driving of the actuator 150.

The lower body 160 is coupled to the valve body 110 at the bottom of the valve body 110 to support the valve body 110.

The valve seat 170 is interposed between the valve body 110 and the pair of side covers 120 and 130 to prevent leakage of the fluid.

Hereinafter, look at the movement path of the fluid passing through the gate valve 100 according to an embodiment of the present invention.

Referring to FIG. 5, the fluid flowing into the inlet 111 flows through the split passage 113 formed in the valve body 110 in two directions, and the inside of the pair of side covers 120 and 130. After passing through the connecting passages (121, 131) formed in the entering into the confluence passage (114) formed inside the valve body 110 is to exit through the outlet portion (114).

At this time, although the valve member 140 is inserted into the confluence passage 114, it is not shown in the drawing.

On the other hand, the surface of the disks (141a, 141b) in contact with the incoming fluid and the surface 132 of the side covers (120, 130) flowing out through the connection passages (121, 131) is mirror surface is formed, stellite surface treatment The compressive stress in contact with the fluid can be reduced (left side cover not shown).

Frequent movement of the disks 141a and 141b in the up and down direction causes wear on the contact surface, and thus increases the likelihood of leakage when used for a long time.

In order to solve this problem, the shape of the part in contact with the fluid is mirrored (completely flat), and the stellite alloy treatment is performed.

As described above, the high-pressure fluid blocking gate valve according to the present invention provides the following effects.

First, the symmetrical fluid flow is made by the split channel, thereby maintaining the lifting balance to prevent the eccentric force, structurally stable to extend the life and to maintain a uniform sealing force.

Second, since the valve members are perforated, the momentary high pressure can be further alleviated and absorbed, and the pressure on both sides of the valve members can be equalized quickly to prevent the occurrence of one-sided sliding of the valve members, reduce friction, and seating surface. It is also possible to prevent leakage of high pressure water in advance by increasing the adhesion to the furnace.

Third, it is easy to open and close to interrupt the high-pressure fluid flow even with a small force of the actuator, can provide a firm sealing effect, it is possible to reduce the size and weight of the valve member has the advantage of excellent price competitiveness.

Fourth, the oil tightness of the valve seat is maintained due to the back pressure effect by the orifice and the plate spring, and the valve seat is formed in a mirror surface, the contact pressure is small, but there is an advantage that can maintain the oil tightness by surface compression.

Fifth, it is useful to improve the responsiveness in the operating conditions of high pressure and high speed fluid, and to prevent pulsation by maximizing the valve sealing effect, efficient blocking of high pressure and high speed fluid, and releasing the instantaneous pressure of the fluid. Provide effect.

As described above, although the present invention has been described by means of a limited embodiment and drawings, the present invention is not limited to this, and the person skilled in the art to which the present invention belongs to Of course, various modifications and variations are possible within the scope of the appended claims.

Claims (4)

A valve body having an inlet and an outlet through which fluid flows in and out, and having a split passage formed therein for diverging the fluid flowing into the inlet to both sides, and having a confluence passage through which the fluid passing through the connecting passage is joined; ; A pair of side covers which are combined with the valve body and have a 'c'-shaped connecting passage therein, through which the fluid passing through the dividing passage is moved, so that the fluids flowing into the joining passage can be symmetrical with each other; ; A valve member formed in the valve body in a vertical direction of the confluence passage, inserted into the through hole, and lifted to open and close the fluid flowing into the confluence passage; An actuator connected to the valve member to control driving of the valve member; And Interposed between the valve body and the side cover provided with a valve seat for preventing the leakage of fluid, High pressure fluid shutoff gate valve. The method of claim 1, The valve member includes a pair of disks for blocking the flow of fluid; A disk holder coupled to each of the pair of disks to hold the disks; A stem fastened vertically through the disk holder; And a fixing member for fixing the stem, wherein a hole is formed in the disk so that the same pressure acts on the inside and the outside of the disc, and the area of the disc coming into contact with the inflowing fluid has a smaller area than that of the facing face. Compensation is possible, High pressure fluid shutoff gate valve. The method of claim 2, The valve member is interposed between the disk and the disk holder, characterized in that the plate spring is further provided to increase the adhesion between the disk and the side cover by the pressure by the elastic force, High pressure fluid shutoff gate valve. The method of claim 2, The surface of the disk and the surface of the side cover flowing through the connecting passage is in contact with the incoming fluid is characterized in that the mirror surface is formed, the surface treatment of stellite to reduce the contact compressive stress with the fluid, High pressure fluid shutoff gate valve.

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