KR101224806B1 - Cylindrical multi down step stage trim, delta pressure control valve - Google Patents

Abstract

PURPOSE: A down-stepped differential pressure type flow control device valve is provided to maintain uniform differential pressure by trebling differential pressure and have an effect to control minute flow rate. CONSTITUTION: A down-stepped differential pressure type flow control device valve is composed as follows. The shapes of holes arranged on the surface of each cylinder are different. In a section where an opening stoke is 20% or less, multiple small slots(13) of which curved length is the largest are matched with small circular holes(16) to maintain uniform differential pressure. In a section where the opening stroke is 60% or less, middle slots(12) and middle circular holes(15) are arranged. In a section where the opening stroke is 60% or more, large slots(11) and large circular holes(14) are arranged so that supply flow rate can be more than tripled.

Description

Down Step Stage Differential Pressure Flow Control Valve {Cylindrical Multi Down Step Stage Trim, Delta Pressure Control Valve}

If the pressure control range of the valve is large in the operation of the fluid system or if the high differential pressure is to be controlled from the valve, the flow rate at the disc and seat of the plug, which is the control throttle of the valve, may be energy at a tremendous speed exceeding the speed of sound in some cases. Is changed.

At this time, the valve trim is accompanied by all the energy conversion characteristics of the fluid, such as cavitation, flashing, or choking, and during this process, the valve trim is damaged on the surface by the continuous collision of the fluid owners.

Most control valve trims vary in degree, but fluids with high temperature and high pressure steam above saturation water are subject to erosion damage. Very bad.

Therefore, the trim under severe operating conditions of the control valve requires not only wear and corrosion resistance but also strong corrosion resistance.

The present invention relates to a down-step stage differential pressure type flow control valve for a globe type control valve used in a nuclear power plant, a thermal power plant, a refinery chemical plant, and the like. (Feed) or controlled steam or saturated water flow control valve ( Steam & Feed) A flow control device applied to a water control valve ) , wherein a valve used for flow control in a system in which a fluid uses high-temperature, high-pressure steam includes the number of turns and the length of the turn of the cylinder. By installing a pressure-reducing type trim with a high differential pressure to increase the pressure, the shock wave energy of the high temperature and high pressure fluid is absorbed to prevent noise and vibration in the valve, and by applying the technique of the present invention, the outer diameter of the flow control device is minimized. It relates to the differential pressure for flow rate control of the variation system and reduce the size of the valve to the step-down stage differential pressure type flow control valve apparatus of interest.

Globe valves for fluid control, ie, pressure, temperature, flow rate and differential pressure control of fluids are commonly referred to as control valves (control valves), and there are many types of internal valves (trims) depending on the control purpose. The type of trim of the control globe valve varies according to the shape characteristics of each trim, but first, the control characteristics of the control valve, ie, the control valve, can be summarized in terms of flow rate and differential pressure. Therefore, the first consideration in designing the control valve is to examine the relationship between the pressure loss structure of the piping system, the supply flow rate, and the pressure loss (differential pressure, ΔP) in the control valve.

The globe valve is a structure that can design the internal shape of the valve to meet all the difficult conditions such as the operating conditions of the fluid, that is, the temperature, pressure, differential pressure conditions in the valve.

The type of trim can be divided into pressure control type and speed control type.

Pressure- controlled trim takes advantage of the phenomenon that the differential pressure builds up as the fluid loses pressure and recovers again as it passes through the orifice throttle,

For example , a pressure controlled type trim is used in which a plurality of through-holes of 5 mm or less are formed in the outer and inner cylinders of a two-stage cylinder structure, and a groove space (an annular chamber, a recovery chamber) is provided in the outer cylinder inner diameter and the inner cylinder outer diameter. It is a representative example of trim.

Speed- controlled trim is a trim controlled by the loss of pressure as the fluid passes through a maze meandered by flow friction resistance.

A representative example is a disk stack that uses a disk in multiple layers.

The present invention is a multi-stage cylinder structure, which differentiates a sequential staircase structure or a grooved curved flow path of the prior art and forms a high differential pressure, and has a slot hole ( 11 , 12 , 13 ) applying a multi-stage cylinder method to satisfy a large flow condition. A downstep stage differential pressure type flow control device 9 was formed in which a curved flow path of a descending step shape having the largest bending length by the combination of circular holes 14 , 15 , and 16 was formed.

In particular, in the case of thermal power plants, when the boiler is heated above 380 ℃ in order to save fuel such as coal, oil and gas, the pressure is increased by about 220 kg / cm2 to produce superheated steam to rotate the turbine and supply water to the boiler accordingly. The Boiler Feed Water Pump (aka BFP), which transfers chemically-cleaned water to the boiler in a circulating water tank (heats up to 180 ° C to reach 9.2kg / ㎠), supplies The discharge pressure of 40 ~ 50 kg / ㎠ is 270 kg / ㎠, which is supplied to the boiler main feed water storage tank (Boiler Main Feed Water Storage Tank) located at the front of the boiler, for the purpose of adjusting the flow rate between the BFP pump and the storage tank . boiler water control valve feet (boiler Feed water Flow control valve) will be installed, in the case of a nuclear power plant thermal power is lower than the temperature and pressure used for safety reasons, but the main feedwater pumps , And the flow rate control main feed water feed water control valve used in a rear end, wherein the valve device is used is applied to a step-down stage differential pressure type flow control apparatus (9) of the valve intended to involve a large flow rate condition.

For the high temperature boiler feet accompanied by a large flow rate condition of the high-pressure system water control valve (Boiler Feed Water Flow Control Valve) is formed excessively on the flow control apparatus, such as a disk stack, increasing the pressure differential when it tree off the valve rear end pressure BFP pump The overload of the valve may cause the pressure at the front end of the valve to drop or the pressure at the rear of the valve may increase, and the back pressure may occur. The ideal flow regulating valve has a pressure of 15 before and after the system. To design differential pressures below% and to create large flow conditions to miniaturize valves. Therefore, solving the problem of the conventional technique, and improves performance by contributing to the energy saving and extend the life of the valve, the step-down stage was the background of the differential pressure type flow control apparatus (9) valves invention.

Figure 14 (A) of the following has been presented for the purpose of controlling the large flow rate by forming a stepped differential pressure passage of a three-stage cylinder structure to temporarily absorb the shock wave energy of the high temperature and high pressure fluid,

In the following FIG. 14 (B) , the hole shape through which each cylinder penetrates the six-stage cylinder structure is used as a two-stage through hole for the purpose of increasing the differential pressure, and is differentiated from the technique of FIG. 14A .

A characteristic feature of the prior art of Fig. 14A is a three-stage cylindrical cylinder structure, in which the helical direction is formed by a combination of cylinders in a forward stepped arrangement in which a plurality of circular through-holes of the same shape overlap each other on the outer surface of each cylinder. Trim applied to the low differential pressure system under high flow conditions , which forms a curved flow path.

In addition, the spiral forward stepped structure causes the fluid having a variable differential pressure to rotate based on the concentric circle of the plug 1 , causing a whirlwind effect (swirl) and turning the plug ( 1 ) to the outer diameter of the plug. It has a feature to implement large flow control of the low differential pressure system to prevent the vibration of (1) to prevent vibration. Of the prior art of FIG. 14 (A) Another advantage is that, a forward stepwise pressure-flow passage of the overlapping structure of forming the differential pressure into a plurality of circular through-hole of the cylinder system is be a large number of through holes on an outer side area of the fluid (cylinder) It has the advantage of being able to meet large flow conditions .

The disadvantage of the prior art of Fig. 14 (A) is that the bending length forming the differential pressure overlaps the circular hole and the circular hole provided in each cylinder by about 1/2 to form the differential pressure, which is because the overlapping bending length is short and the differential pressure Is formed low, the three-stage cylinder structure is also somewhat unreasonable in forming the differential pressure, and the decompression (differential pressure) effect is inferior to that of the prior art example of FIG. 14 (B) , and the other FIG. 15 (C) and ( D) The differential pressure effect is lower than that of the structure, and it is inevitable to be applied to the system without the differential pressure, and in order to form a high differential pressure, at least 10 cylinders ( more than 10 bending turns) must be combined.

A characteristic of the prior art in Fig. 14B is that a six stage cylindrical cylinder structure is provided with a plurality of two stage through holes (large holes, small holes) for each cylinder to form a high differential pressure, and thus a plurality of two However, this trim is applied to the low differential pressure system under high flow conditions , which has formed a spirally curved path by a combination of cylinders in the forward staircase arrangement that overlaps the through holes by 1/2.

In addition, the spiral forward stepped structure causes the fluid having a variable differential pressure to rotate based on the concentric circle of the plug 1 , causing a whirlwind effect (swirl) and turning the plug ( 1 ) to the outer diameter of the plug. It has a feature to implement large flow control of the low differential pressure system to prevent vibration by mitigating the collision of (1). Of the prior art of FIG. 14 (B) Another advantage is that, a forward stepwise pressure-flow passage of the overlapping structure of forming the differential pressure into a plurality of circular through-hole of the cylinder system is be a large number of through holes on an outer side area of the fluid (cylinder) It has the advantage of being able to meet large flow conditions .

The disadvantage of the prior art of Fig. 14 (B) is that the bending length for forming the differential pressure is to form a differential pressure so that the two-stage small circular hole provided in each cylinder and the two-stage large circular hole overlap by about 1/2. The overlapping bending length is short, so the differential pressure is low , and in manufacturing a large number of two-stage through holes (large and small holes) for each cylinder , the two-stage through-hole shape itself is complicated, so it is possible It takes a lot of production time.

A prior art feature of FIG. 15C is a trim applied to a differential pressure system , having a three-stage cylinder structure , in which a forward curved flow path is formed on the outer surface of each cylinder by a combination of a plurality of grooves & through-hole arrangements. .

The structure of (C) of Figure 15, the outer and inner cylinder, and the through-hole coming in the fluid out of the intermediate cylinder flow path pattern shape "b" character, "c" shaped curved groove and point out body inner cylinder of Through holes were combined to form a curved flow path.

A disadvantage of (C) of Figure 15, the take up provided the intermediate flow passage area of the pattern flow path shape is wide in the cylinder to form a pressure difference, may be constrained within the limited space hagieneun reduce the size of the valve fluid, hagieneun meet the large flow rate condition There are limitations, and the differential pressure is also somewhat unreasonable to be applied to the high differential pressure system because the number of four turns of the three-stage cylinder (Turn).

Fig. 15D is a differential pressure type trim, in which [L] design, manufacture, test run, and A / S of a power generation equipment control valve. The characteristic is a three-stage cylindrical cylinder structure , which is provided on the outer surface of each cylinder. Reverse direction due to combination of groove & through hole arrangement Trim applied to the differential pressure system that formed the bent flow path .

The structure of (D) of Figure 15, the outer and inner cylinder has a through hole and, the intermediate layer and the flow path pattern shape from the inner cylinder enters the fluid out "-" Here, b "Here," c "shaped bent groove of And through holes were combined to form a reversed bend channel.

The disadvantage of the (D) of FIG. 15, take up the intermediate layer and the flow path pattern shape a large flow passage area of the inner cylinder provided for forming the differential pressure, it can be limited in a limited space hagieneun reduce the size of the valve the fluid, a large flow rate condition There is a limit to satisfy, and considering the reverse flow path with 6 differential turns and 6 turns of three-stage cylinders, the differential pressure is △ P = 10 kg / ㎠ or less, so it is too difficult to apply to high differential pressure system. .

14 (A) and 14 (B) of the prior art have a disadvantage in that the bending length is very short and is applied to a low differential pressure system by forming a stepped shape with the overlapping structure of the circular hole and the circular hole provided in each cylinder. The advantage is that the structure is not limited to providing a circular hole associated with a plurality of inlet and outlet flow paths on each cylinder side, a technique that is widely applied to a system subject to a large flow rate.

However, when the overlap length of each cylinder circular hole and the circular hole is increased to be applied to the high differential pressure system, there is another problem that the supply flow rate is insufficient.

Of the prior art of FIG. 15 (C) and FIG. 15 (D) is a flow control apparatus diameter in order that applied to the solid one-flow system is a differential pressure effective to form a pressure difference by placing a curved groove in the intermediate layer or the inner cylinder side This has the disadvantage that the valve is enlarged because it must be large.

A characteristic of the present invention is to divide the differential pressure and the flow rate control section into three stages by placing the small slot holes 11 provided in the respective cylinders to increase the bending length in a section of 20% or less in which the opening ratio is very variable. The bending path by the combination of the holes 16 formed the largest bending flow path to form a speed reducing type flow path that maintains the balanced differential pressure, and the bending length was about 5 in the middle of the flow rate (pressure) control section at each cylinder intermediate position. However, the cylinder middle flow rate (medium differential pressure) downstep flow passage 22 is disposed, and the 5-stage cylinder large flow rate (low differential pressure) downstep flow passage 21 having a small bending length is disposed and supplied to prevent the shortage of the flow rate control section. The downstep stage differential pressure type flow control device 9 of the present invention has been developed, which is composed of three stages of downstep flow passages 21, 22, and 23 in consideration of the flow rate and the differential pressure characteristic for increasing the flow rate.

The present invention is directed to the development of a downstep stage differential pressure type flow control device ( 9 ) which secures the advantages and disadvantages of the four prior arts and which can be applied from valve grade 900 pounds (LB) to 1500 pounds (LB). Was created,

Compared with the prior art, the technique of the present invention solves the problems of the prior art, by minimizing the fluid height related to the fluid outer diameter and the driving force (maximum allowable stroke) while supplying a large flow rate while forming a higher differential pressure. Technology "

Down step stage Differential pressure type flow control device ( 9 ) As a design condition for minimizing the outer diameter size and reducing the weight of the valve , (1) Increasing the number of bending turns in the flow path under differential pressure conditions and (2) Multiple inlet and outlet conditions Arrange the flow path, and prevent bottlenecks (static flow) for fine flow control.Make sure to maintain the proper height while minimizing the outer diameter of the flow control device while maintaining the above three conditions while satisfying the above three conditions. Lightweight.

In addition, in applying the flow control device to the control valve, the differential pressure condition and the large flow condition in the valve are considered in consideration of the relationship between the pressure loss structure of the piping system and the pressure loss (differential pressure, ΔP) at the valve under high temperature and high pressure operation conditions of the fluid. It is provided with a light weight control device.

As applied in the present invention, the cylinder system is adopted to satisfy the large flow conditions "large diameter (more than 10 ￠) slot holes 11 and circular holes 14 at the upper end of each cylinder. It was.

Down step stage differential pressure type flow control device ( 9 ) of the present invention is formed by dividing the hole shape provided in each cylinder surface into three stages of flow rate and differential pressure control step, to protect the valve from shock wave energy of high temperature and high pressure In forming the differential pressure flow path, a plurality of small slot holes 13 having the largest bending length are formed in the small circular hole 16 to prevent high vibration in a section of 20% or less of the opening operation stroke having a very high differential pressure . To maintain the balanced differential pressure, and to provide the middle slot hole 12 and the circular hole 15 with a moderate bending length in the flow rate (pressure) adjustment section of 60% or less of the opening operation stroke . Forming a flow rate (pressure) control section by satisfying the medium flow rate (medium differential pressure) condition, and having a small bending length for a slot opening 11 and a large opening for stroke opening of 60% or more in preparation for the insufficient supply flow rate at the rear end of the valve . won Was constructed that by having the holes 14 increase the supply flow rate three times or more configurations for each cylinder according to its flow characteristics,

2 and 3, 4, 5, 6, a down step the 5-stage step of configuring the differential pressure type flow control apparatus (9) the cylinder that flow shown in 7 (high differential pressure) down step passage (23 In the process of forming the differential pressure type flow path and the configuration method and characteristics ,

In maintaining the balanced differential pressure by three times increasing the differential pressure formation of the variable differential pressure section below 20% of the opening operation, a plurality of small circular shapes are provided in the five-stage cylinder 45 based on the direction in which the high temperature and high pressure fluid enters the valve (plug). The high temperature and high pressure fluid introduced into the hole ( 16 ) is connected to the right side of the plurality of small slot holes ( 13 ) provided in the four-stage cylinder ( 44 ), so that the fluid is diverted by 90 degrees to form a first curved flow path .

By the plurality of small circular holes 16 provided in the three-stage cylinder 43 connected through the left side of the slot hole is turned 90 degrees to form a secondary bend flow path ,

Connected to the right side of the plurality of small slot holes 13 provided in the second stage cylinder 42 connected through the circular hole, the fluid is turned 90 degrees to form a tertiary bend flow path ,

Fluid passing through is connected to a plurality of small round holes 16 provided on the first-stage cylinder 41 is connected to the left side of the slot opening is 90 degrees, the direction is switched quaternary bent flow path is formed bending length is the largest descent stairs A differential pressure type flow path of a five-stage cylinder low flow rate ( high differential pressure ) downstep flow path 23 is formed in which a curved flow path of the shape is formed by each cylinder combination.

2 and 3, 4, 5, 6, the five-cylinder fuel oil amount (of the differential pressure) Fig. 2, step constituting the down step-stage differential pressure type flow control apparatus 9 shown in 7 down step passage (22 Looking at the process of forming the differential pressure and flow control flow path and configuration method and features ,

The high-temperature and high-pressure fluid entering the plurality of circular holes 15 in the five-stage cylinder 45 , which is used for differential pressure formation and simultaneous flow regulation, is provided in the four-stage cylinder 44 . Connected to the right side of the plurality of slot holes ( 12 ) is the first bend flow path is formed while the fluid is turned 90 degrees,

The secondary bend flow path is formed by being turned 90 degrees by a plurality of circular holes 15 provided in the three-stage cylinder 43 connected through the left side of the slot hole,

Connected to the right side of the plurality of slot holes 12 provided in the second stage cylinder 42 connected through the circular hole, the fluid is turned 90 degrees to form a tertiary bend flow path ,

The fluid that is connected to and passed through the plurality of circular holes 15 provided in the first stage cylinder 41 connected to the left side of the slot hole is turned 90 degrees and has a bend length to form a fourth bend flow path. A flow path for adjusting the differential pressure and flow rate of the five-stage cylinder medium flow rate ( medium differential pressure ) downstep flow passage 22 , in which the intermediate downward stepped bend flow passage is formed by each cylinder combination, is formed.

2 and 3, 4, 5, 6, a down step-stage differential pressure type three-phase constituting the flow control apparatus (9) of five cylinder-Flow (low differential) shown in FIG down step passage (21 The process of forming the differential pressure and flow rate supply flow path and the configuration method and characteristics ,

High-temperature high-pressure fluid enters into a plurality of large circular hole 14 which is used a differential pressure formed simultaneously with the supply flow rate of the opening operation more than 60% of the large flow rate region for the purpose of increasing three times, the 5-stage cylinder 45 is a four-stage Connected to the right side of the plurality of large slot holes 11 provided in the cylinder 44 , the first bend flow path is formed while the fluid is turned 90 degrees,

The secondary bend flow path is formed by being turned 90 degrees by a plurality of large circular holes 14 provided in the three-stage cylinder 43 connected through the left side of the slot hole,

Connected to the right side of the plurality of large slot holes 11 provided in the second stage cylinder 42 connected through the circular hole, the fluid is turned 90 degrees to form a third bend flow path ,

Fluid passing through is connected to the first-stage cylinder 41, a plurality of large circular hole 14 provided in connected to the left side of the slot opening is 90 degrees, the direction is switched quaternary winding passage is a small curved length falling is formed step-shaped The flow path for supplying the differential pressure and the large flow rate of the five-stage cylinder large flow rate ( low differential pressure ) downstep flow passage 21 formed by each cylinder combination is formed.

The method of arranging the downstep flow paths 21, 22, and 23 by the dividing angle, and includes a large, medium, and small slot hole penetrating the respective cylinder surface (side surface) on the basis of the concentric circle of the plug 1 ( 11 , 12 , 13 ) and the large, medium and small circular holes ( 14 , 15 , 16 ) are changed according to the system operating conditions at the first division angle zero, and the 5-stage cylinder low flow rate (high differential pressure) downstep flow path 23 is arranged at the lower end of two or more up and down, five-stage cylinder heavy flow rate (medium differential pressure) downstep flow passage 22 is arranged three or more up and down in the middle, the five-stage cylinder large flow rate (low differential pressure) ) The downstep flow passage 21 has a structure in which three or more of the downstep flow passages 21 are arranged at the top and bottom thereof .

In the second dividing angle, the plurality of slot holes and the circular holes are arranged in an up-and-down zigzag arrangement method for preventing bottlenecks ( congestion flow generated during opening rate control operation ), and holes and holes arranged by the first dividing angle. Arrangement holes by the second dividing angle are arranged in the interspace, and in the third dividing angle, they are arranged in the same manner as the first hole arrangement shape, and the fourth dividing angle is arranged in the same manner as the second hole arrangement shape. It is formed in a structure arranged in a zigzag up and down.

One assembly pin through hole ( 17 ) of 6 mm or less is provided in the front of each cylinder's uppermost surface (side surface) on the basis of the divided angle at which the downstep flow passages (21, 22, 23) are formed. By this combination, the downstep flow passages 21, 22, and 23 are automatically formed.

In the manufacturing method of the down-step stage differential pressure type flow control device ( 9 ), each cylinder outer cylindrical surface, inner cylindrical surface and length machining is completed after the first rough machining on a general-purpose lathe, a rotating machine dedicated machine for low manufacturing cost, In the general-purpose milling machine, which is a plane processing machine equipped with an index angle dividing device, a plurality of holes and slot through-holes provided on each cylinder side are processed secondly, and the inner and outer surfaces are finished on the final universal lathe.

Another method is to shorten the production time if the secondary machining area to be implemented in general milling is processed in the multi-axis machine center, which is a three-axis machine that connects CAD and CAM.

When the technology of the three-stage downstep flow passage of the multi-stage cylinder structure shown in Figs. 2, 3, 4, 5, 6, and 7 is implied,

① The differential pressure flow path of the 5-stage low flow ( high differential pressure ) downstep flow path 23 is formed to maintain the balanced differential pressure by tripled the differential pressure formation of the variable differential pressure section of 20% or less of the opening operation . 5 is used as a driving pressure difference is formed simultaneously with the flow control of more than 60% the flow rate adjustment period purpose cylinder fuel oil amount (of the differential pressure) down step is formed in the differential pressure and the flow rate regulating passage of the flow path (22), ③ the opening operation more than 60% A differential pressure and a large flow rate supply passage of a five-stage cylinder large flow rate ( low differential pressure ) downstep flow passage 21 , which is used for the purpose of forming a differential pressure in a large flow rate section and a threefold increase in the simultaneous supply flow rate, is formed. A downstep stage differential pressure type flow control device 9 is formed by a combination of two techniques.

According to the operation condition of the power generation control valve, the trim which forms the downstep flow path of the multi-stage cylinder structure is classified into two types,

First, the five-stage cylinder downsteps (21, 22, 23) differential pressure trim (31) applied to the medium pressure and the high flow conditions shown in FIGS. 2, 3, 4, 5, 6, and 7 ,

Second, the three-stage cylinder downsteps 24, 25, 26 and the large flow rate trim 32, etc., which are applied to the low differential pressure and the large flow conditions shown in FIGS. 8 and 9, 10, 11, 12, and 13 The downstep stage differential pressure type flow control apparatus 9 classified as follows is classified.

2 and 3, 4, 5, 6, 7 , the flow drawn through the multi-stage cylinder downstep flow passage (21, 22, 23) shown in the descending step of the fluid suddenly bent in the 90 degree direction by a down step flow path shaped high temperature, maintaining the change differential pressure of the fluid that breakout force is accompanied by a strong shock wave energy of the high-pressure condition to balance the pressure difference, and the plug 1 as the basis of concentric flow in an oblique direction of the helical vortex effect (vortex ), the plug (1) outer diameter by the turning portion to mitigate the impact of the plug (1) from a strong shock wave energy in the fluid with noise protection for the valve from the vibration and down step-stage differential pressure type flow to reduce the size of the valve control unit causes ( 9).

The control valve having the downstep stage differential pressure type flow control device 9 according to the present invention takes into account the relationship between the pressure loss structure of the piping system and the pressure loss (differential pressure, ΔP) in the valve under high temperature and high pressure operation conditions of the fluid. And a downstep stage differential pressure type flow control device ( 9 ) having a differential pressure condition and a large flow rate condition in a valve,

According to the operation condition of the power generation control valve, the trim which forms the downstep flow path of the multi-stage cylinder structure is classified into two types,

First, the five-stage cylinder down step (21, 22, 23) of the differential pressure type trim 31 is formed by dividing the flow rate and the differential pressure adjustment step into three stages of the hole shape provided in each cylinder surface, five stage cylinder structure In the lower part of the flow control device where the fluctuation differential pressure in the opening of the lower part corresponding to 4 turns and the lower part corresponding to the first stage is 20% or less Is designed to be 3 times higher to maintain a balanced differential pressure, and the fluid drawn through the downstep flow passages 21, 22, and 23 is accompanied by shock wave energy having high destructive force under high temperature and high pressure conditions by the downstep flow passage having the shape of a descending staircase. It is effective to maintain the variable differential pressure of a fluid at a balanced differential pressure.

In addition, the flow control section under 60% of the opening operation of the middle part of the second stage is used for differential pressure formation and simultaneous flow control, and has a fine flow control effect.

Is formed for flow passage by a combination of a large slot hole 11 and the large circular hole 14, a pressure difference is formed simultaneously with the supply flow rate of the third stage, the upper end of the opening operation more than 60% of the large flow rate region for the purpose of increase of 3-fold In addition, there is an effect of supplying a practical large flow rate according to the supply flow rate shortage of the flow control section.

Moreover, landscaped fed through the step-flow path (21,22,23) is a fluid plug (1) as a concentric circle relative to the flow in an oblique direction of the spiral caused by the vortex effect (vortex) turning part plug (1) outer diameter of the fluid Five-stage cylinder downstep (21, 22, 23) differential pressure type applied to medium differential pressure and large flow conditions with the effect of mitigating the impact of the plug ( 1 ) from the strong shock wave energy, and protecting the valve from noise and vibration. Trim 31.

Second, three-stage cylinder down step (24, 25, 26) The large flow rate trim 32 is formed in each of the cylinder shape is divided into three stages flow rate and differential pressure control step, three-stage cylinder structure Trim is applied to low differential pressure and high flow conditions with two turns.

Although the differential pressure effect is less than that of the 5-stage cylinder method, it is excellent in supplying a large flow rate of the medium temperature and the medium pressure system below the valve grade of 900 pounds (LB).

In addition, the fluid inlet down through the step (24,25,26) of the plug flow path (1) as a concentric circle relative to the flow in an oblique direction of the spiral caused by the vortex effect (vortex) turning part plug (1) outer diameter of the fluid The large flow rate of the three-stage cylinder downstep (24, 25, 26) applied to low differential pressure and large flow conditions, with the effect of mitigating the impact of the plug ( 1 ) from the strong shock wave energy, which has the effect of protecting the valve from noise and vibration. Trim 32.

1 is an overall cross-sectional view of a downstep stage differential pressure type flow control device 9 excluding the actuator part mounted and assembled to a component in a valve.
2 and 3, 4, 5, 6, and 7 The process of forming the downstep flow paths 21, 22, and 23 of the five-stage cylinder downsteps 21, 22, and 23 differential pressure type trim 31 is as follows.
2 is an isometric view of the five-stage cylinder downsteps 21, 22, 23 differential pressure trim 31;
Fig. 3 is an isometric view in which slotted holes and circular holes are shown on the cut surfaces of the cylinders of the five-stage cylinder downsteps 21, 22, and 23 differential pressure trim 31;
Fig. 4 is an isometric view in which the five-stage high flow rate (low differential pressure) downstep flow passage 21 is displayed on the cut surface of the five-stage cylinder downsteps 21, 22, and 23 differential pressure trim 31;
5 is a front view of the five-stage cylinder downstep 21, 22, 23 differential pressure trim 31;
Fig. 6 is an isometric view in which the five-stage large flow rate (low differential pressure) downstep flow passage 21 is displayed on the cut plane of the five-stage cylinder downsteps 21, 22, and 23 differential pressure trim 31;
Fig. 7 is an isometric view in which the five-stage heavy flow rate (medium differential pressure) downstep flow passage 22 is displayed on the cut plane of the five-stage cylinder downsteps 21, 22, and 23 differential pressure trim 31;
8 and 9, 10, 11, 12, and 13 , the down-step flow paths 24, 25, 26 of the large-stage trim 32 of the three-stage cylinder downsteps 24, 25, 26 are formed. The process is as follows.
8 is an isometric view of a three-stage cylinder downstep 24, 25, 26 large flow rate trim 32;
Fig. 9 is an isometric view in which slotted holes and circular holes are shown on the cut surfaces of the cylinders of the three-stage cylinder downsteps 24, 25 and 26 large flow rate trim 32;
Fig. 10 is an isometric view in which the three-stage large flow rate (low differential pressure) downstep flow passage 24 is shown on the cut surface of the three-stage cylinder downstep 24, 25, 26 large flow rate trim 32;
11 is a front view of the three-stage cylinder downstep 24, 25, 26 large flow rate trim 32;
Fig. 12 is an isometric view in which the three-stage large flow rate (low differential pressure) downstep flow passage 24 is shown in the cut plane of the three-stage cylinder downsteps 24, 25, 26 large flow rate trim 32;
FIG. 13 is an isometric view in which the three-stage heavy flow rate (medium differential pressure) downstep flow path 25 is shown in the cut plane of the three-stage cylinder downstep 24, 25, 26 large flow rate trim 32;
Prior art (A) of Fig. 14 is a spirally downward stepped trim isometric view in a spiral direction composed of a circular hole in a three-stage cylinder structure and a spiral positive step in which each cylinder is combined in a downward stepped arrangement so that the circular holes overlap. Isometric view of the flow path of the trim
The prior art (B) of FIG. 14 is a spiral step forward trim isometric view in a six-stage cylinder structure, each stage having a two-stage circular hole in each cylinder, and a six-cylinder two-stage through-hole. An isometric view of the flow
Another prior art (C) of FIG. 15 is a trim front view composed of a forward flow path of a three-stage cylinder structure.
Another prior art (D) of FIG. 15 is a trim front view composed of a reverse flow path of a three-stage cylinder structure.

1 is an overall cross-sectional view of a downstep stage differential pressure type flow control device 9 excluding the actuator part mounted and assembled to a component in a valve.

2 and 3, 4, 5, 6, and 7 5 cylinder down step 23, the differential pressure type stream 31, the five-cylinder low-flow rate in the in-cylinder bottom step of the configuration (and the differential pressure) down step process in which a differential pressure type flow path of flow passage 23 is formed is to the same.

Connected to the right side of the plurality of small slot holes 13 provided in the four-stage cylinder 44 in which the plurality of small circular holes 16 and the flow path are connected to the five-stage cylinder 45 , and the flow path is diverted first 90 degrees; A plurality of small circular holes 16 provided in the three-stage cylinder 43 connected through the left side of the slot hole redirects the flow path to the second 90 degrees, and the two-stage cylinder 42 connected through the circular hole. A plurality of small circular holes 16 provided in the first stage cylinder 41 connected to the right side of the plurality of small slot holes 13 provided in the first direction, and the flow path is turned 90 degrees in the third direction, and connected to the left side of the slot holes. ) five-cylinder low-flow-rate is flow connected to the 90 switching the direction as quaternary is bent flow path is bent flow path of the shape bent a length of the largest falling staircase formed is configured by a respective cylinder combination (high differential pressure) down step A flow path 23 is formed.

The five-stage cylinder heavy flow rate located in the two stages of the cylinder stop portion constituting the five-stage cylinder downstep 22 differential pressure trim 31 shown in FIGS. 2 and 3, 4, 5, 6, and 7 ( Medium differential pressure) The process of forming the differential pressure of the down-step flow path 22 and the flow volume adjustment flow path is as follows.

Connected to the right side of the plurality of middle slot holes 12 provided in the four-stage cylinder 44 in which the plurality of middle circular holes 15 and the flow path are connected to the five-stage cylinder 45 , and the flow path is diverted first 90 degrees; by a three-stage cylinder a plurality of circular holes (15) of the provided at 43 which is connected through the left side of the slot opening a flow path secondary 90 is switched direction, two-stage cylinder (42 is connected via the circular hole Is connected to the right side of the plurality of slot holes 12 of the plurality of circular holes ( 12 ), the flow path is turned 90 degrees in the third direction, the plurality of middle circular holes ( 15 ) provided in the first stage cylinder 41 connected to the left side of the slot hole ) is connected to the flow path in the fourth 90 ° direction is switched bent flow path is a curved length which is formed bent flow path of the descending step-shaped medium is down, five-cylinder fuel oil amount (of the differential pressure) that is constituted by a respective cylinder combination forming a step passage (22) The.

Five-stage cylinder flow rate (lower) located in the upper three stages of the cylinder constituting the five-stage cylinder downstep 21 differential pressure trim 31 shown in FIGS. 2, 3, 4, 5, 6, and 7 Differential pressure) The process of forming the differential pressure and the large flow rate supply flow path of the down-step flow path 21 is as follows.

Connected to the right side of the plurality of large slot holes 11 provided in the four-stage cylinder 44 in which the plurality of large circular holes 14 and the flow path are connected to the five-stage cylinder 45 , the flow path is diverted to the first 90 degrees, by a plurality of large circular hole 14 provided in the third stage cylinder 43 is connected through the left side of the slot opening a flow path secondary 90 is switched direction, two-stage cylinder (42 is connected via the circular hole Is connected to the right side of the plurality of large slot holes 11 provided in the plurality of holes , and the flow path is turned 90 degrees in the third direction, and the plurality of large circular holes ( 14 ) provided in the first stage cylinder 41 connected to the left side of the slot holes. ) connected to the flow path 90 direction is switched five cylinder-flow that is bent flow path is bent flow path of the small winding length falling staircase shape is formed composed of the respective cylinder combination (low differential to fourth) the down step euro ( 21 ) is formed.

2 and 3, 4, 5, 6, and 7 the arrangement method by the divided angle constituting the downstep flow path of the differential pressure trim 31 of the five-stage cylinder downsteps (21, 22, 23) shown in FIG. to,

The large, medium and small slot holes 11 , 12 and 13 and the large, medium and small circular holes 14 , 15 and 16 which penetrate the respective cylinder surfaces (sides) are formed at the first dividing angle zero. The five-stage cylinder low flow rate (high differential pressure) downstep flow passage 23 is arranged at the lower end two or more, and the five-stage cylinder medium flow rate (medium differential pressure) downstep flow passage 22 is three up and down in the middle. The five-stage cylinder large flow rate (low differential pressure) downstep flow passage 21 is arranged in the upper and lower portions at the upper end thereof, and the plurality of slot holes and the circular holes are formed at the second dividing angle. The holes arranged by the second dividing angle are arranged in the space between the holes and the holes arranged by the first dividing angle, and the third dividing angle is arranged in the same manner as the first hole array shape, and the fourth dividing angle is It is arranged in the same shape as the second hole array shape, and it is repeatedly Geujae is formed from a structure in which an array thereof.

Three-stage cylinder low flow rate located at the bottom of the cylinder, which is the first stage constituting the three-stage cylinder downstep 26 large flow rate trim 32 shown in FIGS. 8 and 9, 10, 11, 12, 13 (high Differential pressure) The process of forming the differential pressure type flow path of the down-step flow path 26 is as follows.

Connected to the right side of the plurality of small slot holes 13 provided in the two-stage cylinder 42 in which the plurality of small circular holes 16 and the flow path are connected to the three-stage cylinder 43 , and the flow path is diverted to the first 90 degrees; 90 ° direction is switched a large bending length of the curved flow path falling staircase shape is connected to a plurality of small round holes 16 provided on the first-stage cylinder 41 is connected through the left side of the slot opening a passage to the secondary A three-stage cylinder low flow rate (high differential pressure) downstep flow passage 26 is formed in which the bend flow path of is formed by each cylinder combination.

Three-stage cylinder heavy flow (located at the middle of the cylinder stop, which constitutes the three-stage cylinder downstep 25 large flow rate trim 32 shown in FIGS. 8 and 9, 10, 11, 12, 13 ) differential pressure) down differential pressure and flow rate adjustment process of the flow path formed of the step passage (25) is as follows.

Connected to the right side of the plurality of middle slot holes 12 provided in the second stage cylinder 42 in which the plurality of middle circular holes 15 and the flow path are connected to the three-stage cylinder 43 , and the flow path is first-turned 90 degrees; The bending length that is connected to the plurality of circular holes 15 provided in the first-stage cylinder 41 connected through the left side of the slot hole and the flow path is secondarily rotated 90 degrees to form a bend flow path is intermediately lowered. A three-stage cylinder medium flow rate ( medium differential pressure ) downstep flow passage 25 is formed in which a stepped curved flow path is formed by each cylinder combination.

A three-stage cylinder high flow rate ( low low) located at the top of the cylinder in three stages constituting the three-stage cylinder downstep 24 high flow rate trim 32 shown in FIGS. 8, 9, 10, 11, 12, and 13 . differential pressure) down differential pressure and flow rate adjustment process of the flow path formed of the step passage (24) is as follows.

Connected to the right side of the plurality of large slot holes 11 provided in the two-stage cylinder 42 in which the plurality of large circular holes 14 and the flow path are connected to the three-stage cylinder 43 , and the flow path is diverted first 90 degrees; The shortest descending step of bending length is connected to a plurality of large circular holes 14 provided in the first-stage cylinder 41 connected through the left side of the slot hole, and the flow path is second- turned 90 degrees to form a bending flow path. A three-stage cylinder large flow rate ( low differential pressure ) downstep flow passage 24 is formed in which the curved flow passage of the shape is constituted by each cylinder combination.

8 and 9, 10, 11, 12, and 13 arrangement method by the divided angle constituting the downstep flow path of the large flow rate trim 32 of the three-stage cylinder downstep (24, 25, 26) to,

The large, medium and small slot holes 11 , 12 and 13 and the large, medium and small circular holes 14 , 15 and 16 which penetrate the respective cylinder surfaces (sides) are formed at the first dividing angle zero. 3-cylinder low-flow-rate (high differential pressure) down step passage (26) are arranged onto the lower end, at least two up and down, the 3-cylinder fuel oil amount (of the differential pressure) down step passage (25) is the in the middle and down 3 The three-stage cylinder large flow rate (low differential pressure) downstep flow passage 24 is arranged in the upper and lower portions at the upper end thereof, and the plurality of slot holes and the circular holes are formed at the second dividing angle. The holes arranged by the second dividing angle are arranged in the space between the holes and the holes arranged by the first dividing angle, and the third dividing angle is arranged in the same manner as the first hole array shape, and the fourth dividing angle is It is arranged in the same shape as the second hole array shape, and it is repeatedly Geujae is formed from a structure in which an array thereof.

In terms of flow analysis, the fluid piping design in the power plant is determined to be 5 m / s or less, and the high pressure piping uses schedule (SCH.) 160, and the low pressure piping uses piping with smaller schedule number, depending on the working pressure class. .

Speed-controlled trims with no differential pressure before and after the valve are recommended to be designed to be 50 ft / sec (15.3 m / s) or less.

When there is a differential pressure before and after the valve, or when a differential pressure is to be formed for the purpose of miniaturizing the valve and protecting the valve, the internal speed of the trim or flow control device ( 9 ) is increased by 30% to 65 ft / sec (20 Allow valves up to m / sec) to design valves.

The following valve flow coefficient calculation formula is applied to the steam in saturated water temperature conditions as follows.

The flow control apparatus of the present invention will be described with reference to FIG. 1 in that a valve body is formed in combination with the following valve components.

The globe type plug ( 1 ) is an actuator stem or a fail-to-close type that receives the driving force by a spring force mounted on the upper part of the actuator, and moves the valve plug 1 upward and downward. The flow rate and pressure are adjusted according to the opening, closing and opening rate of the operating conditions. The stem is installed through the Bonnet Assembly 6 .

The valve seat ring ( 2 ) is a component which is installed for the purpose of sealing and preventing the leakage of fluid when the plug is seated in the valve body.

Packing box ( 3 ) is a part that blocks the fluid from following the valve stem and leaks out of the bonnet. The packing box is largely classified into the material of the packing. [Graphite Mold Packing Rings], Carbon Bushings [Carbon Sleeves].

Bonnet ( 6 ) is located between the valve body and yoke and consists of a packing and a packing box, and together with the body to seal the pressure and fluid of the process Have.

Down flow, flow to close ( 19 ) is the installation direction of the piping and the valve body ( 7 ) in the direction in which the primary pressure of the fluid closes the valve plug (disc). Is a flow path through which fluid is installed, the application technology of the present invention is described as a downflow 19 .

Up Flow, Flow to open ( 20 ) is the installation direction of piping and valve body ( 7 ) and the valve body in the direction that the primary pressure of the fluid opens the valve plug (disc). Refers to the flow path through which the fluid is installed.

** Explanation of symbols for main parts of drawings **
1: Globe type Balancing Plug
2: Valve Seat-ring
3: Seat-ring Gasket
4: Bonnet Gasket
5: Packing Box
6: Bonnet Assembly
7: valve body
9: downstep stage differential pressure type flow control device
(Cylindrical Multi Down Step Stage Trim)
11: Slot Large Holes
12: Slot Middle Holes
13: Slot Small Holes
14: Large Large Holes
15: Circle Middle Holes
16: Circle Small Holes
17: Pin Holes for Assembly
18: Down Flow, Flow to close
19: Up Flow, Flow to open
21: 5-stage cylinder large flow rate (low differential pressure) downstep flow path
22: 5-stage cylinder medium flow rate (medium differential pressure) downstep flow path
23: 5 cylinder low flow rate (high differential pressure) downstep flow path
24: Three-stage cylinder large flow rate (low differential pressure) downstep flow path
25: Three-stage cylinder medium flow rate (medium differential pressure) downstep flow path
26: Three-cylinder low flow rate (high differential pressure) downstep flow path
31: 5-stage cylinder down step (21, 22, 23) differential pressure trim
32: 3-stage cylinder down step (24, 25, 26) large flow rate trim
41: 1st stage cylinder
42: two stage cylinder
43: three stage cylinder
44: four stage cylinder
45: 5-stage cylinder

Claims (3)

In applying the flow control device to the control valve, the differential pressure condition and the large flow rate condition in the valve are considered in consideration of the relationship between the pressure loss structure of the piping system and the pressure loss (differential pressure, ΔP) at the valve under high temperature and high pressure operation conditions of the fluid. As for the downstep stage differential pressure type flow control apparatus 9 ,

The hole shape provided on the surface of each cylinder is divided into three stages of flow rate and differential pressure control step, and the opening pressure stroke with high fluctuation differential pressure in forming differential pressure flow path to protect the valve from shock wave energy of high temperature and high pressure. (Stroke) In the section of 20% or less, a plurality of small slot holes 13 having the largest bending length are arranged in combination with the small circular holes 16 to prevent high vibration, thereby maintaining a balanced differential pressure and opening stroke. In the flow rate (pressure) adjustment section of 60% or less, the medium length (mid-pressure) condition is provided by providing the middle slot hole (12) and the circular hole (15) with a moderate bending length. And the large slot hole 11 and the large circular hole 14 having a small bend length increase the supply flow rate by three times or more at a stroke opening of 60% or more in preparation for the insufficient supply flow rate at the rear end of the valve. With structure Each cylinder is configured for each flow characteristic,

In maintaining the balanced differential pressure by three times increasing the differential pressure formation of the variable differential pressure section below 20% of the opening operation, a plurality of small circular shapes are provided in the five-stage cylinder 45 based on the direction in which the high temperature and high pressure fluid enters the valve (plug). The high temperature and high pressure fluid introduced into the hole ( 16 ) is connected to the right side of the plurality of small slot holes ( 13 ) provided in the four-stage cylinder ( 44 ), so that the fluid is diverted by 90 degrees to form a first curved flow path .
By the plurality of small circular holes 16 provided in the three-stage cylinder 43 connected through the left side of the slot hole is turned 90 degrees to form a secondary bend flow path ,
Connected to the right side of the plurality of small slot holes 13 provided in the second stage cylinder 42 connected through the circular hole, the fluid is turned 90 degrees to form a tertiary bend flow path ,
Fluid passing through is connected to a plurality of small round holes 16 provided on the first-stage cylinder 41 is connected to the left side of the slot opening is 90 degrees, the direction is switched quaternary bent flow path is formed bending length is the largest descent stairs A differential pressure flow path of a five-stage low flow (high differential pressure) downstep flow passage ( 23 ) in which a curved flow path of the shape is constituted by each cylinder combination is formed,

The high-temperature and high-pressure fluid entering the plurality of circular holes 15 in the five-stage cylinder 45 , which is used for differential pressure formation and simultaneous flow regulation, is provided in the four-stage cylinder 44 . leads to the slot hole 12 of a plurality of provided in the plurality of slot holes 12 and the third stage cylinder 43 is a plurality of circular holes 15 and the two-stage cylinder 42 is provided in, first-stage cylinder ( 41 is a five-stage cylinder in which a fluid flow path connected to a plurality of circular holes 15 is formed by a combination of cylinders having a downward stepped bend path with a medium bending length to form a fourth bend flow path. The flow rate for adjusting the differential pressure and flow rate of the medium flow rate (medium differential pressure) downstep flow passage 22 is formed.

High-temperature high-pressure fluid enters into a plurality of large circular hole 14 which is used a differential pressure formed simultaneously with the supply flow rate of the opening operation more than 60% of the large flow rate region for the purpose of increasing three times, the 5-stage cylinder 45 is a four-stage followed by a plurality of stand-slot opening (11) and a plurality of large circular hole 14 and the two-stage cylinder 42, a plurality of large slot hole 11 provided in the provided in the third stage cylinder 43 is provided in the cylinder 44 The fluid that is connected to and passed through the plurality of large circular holes 14 provided in the first stage cylinder 41 is formed by the combination of cylinders having a small downward stepped bend path in which the fourth bend flow path is formed. A five-stage cylinder large flow rate (low differential pressure) downstep flow passage 21 is formed and a flow path for supplying a large flow rate

The method of arranging the downstep flow paths 21, 22, and 23 by the dividing angle, and includes a large, medium, and small slot hole penetrating the respective cylinder surface (side surface) on the basis of the concentric circle of the plug 1 ( 11 , 12 , 13 ) and the large, medium and small circular holes ( 14 , 15 , 16 ) are changed according to the system operating conditions at the first division angle zero, and the 5-stage cylinder low flow rate (high differential pressure) downstep flow path 23 is arranged at the lower end of two or more up and down, five-stage cylinder heavy flow rate (medium differential pressure) downstep flow passage 22 is arranged three or more up and down in the middle, the five-stage cylinder large flow rate (low differential pressure) ) The downstep flow passage 21 has a structure in which three or more of the downstep flow passages 21 are arranged at the top and bottom thereof .
In the second dividing angle, the plurality of slot holes and the circular holes are arranged in an upper and lower zigzag arrangement method for preventing bottlenecks (congestion flow rate generated during opening control), and holes and holes arranged by the first dividing angle. Arrangement holes by the second dividing angle are arranged in the interspace, and in the third dividing angle, they are arranged in the same manner as the first hole arrangement shape, and the fourth dividing angle is arranged in the same manner as the second hole arrangement shape. Including a structure arranged in a zigzag up and down,

One assembly pin through hole ( 17 ) of 6 mm or less is provided in the front of each cylinder's uppermost surface (side surface) on the basis of the divided angle at which the downstep flow passages (21, 22, 23) are formed. Combined to cause the downstep flow passages 21, 22, 23 to be formed,

When implying the technology of the creative technology of the three-step downstep flow passage having the multi-stage cylinder structure as described above, the five-stage cylinder maintains the balanced differential pressure by doubling the differential pressure formation of the variable differential pressure section of 20% or less of the opening operation. The differential pressure type flow path of the low flow rate (high differential pressure) downstep flow path 23 is formed . The differential pressure and flow rate adjustment flow paths of the downstep flow passage 22 are formed, and the 5-stage cylinder large flow rate ( 3) is used for the purpose of increasing the differential pressure and the simultaneous supply flow rate in the large flow rate section of 60% or more of the opening operation. Low differential pressure) A downstep stage differential pressure type flow control device (9), in which a differential pressure and a large flow rate supply passage of the downstep passage ( 21 ) are formed, and are formed by a combination of the above three techniques. The method of claim 1,
According to the operation condition of the power generation control valve, the trim which forms the downstep flow path of the multi-stage cylinder structure is classified into two types,
First, the five-stage cylinder downsteps (21, 22, 23) differential pressure trim (31) applied to the differential pressure and the large flow conditions;
Second, the downstep stage differential pressure type flow control device 9 classified into three-stage cylinder downsteps 24, 25, 26, large flow rate trim 32, and the like applied to low differential pressure and large flow conditions. The method of claim 1,
The fluid introduced through the multi-stage cylinder downstep flow passages 21, 22, and 23 is accompanied by a shock wave energy having a high destructive force under high temperature and high pressure conditions by a downward stepped downstep flow passage in which the fluid suddenly bends in the 90 degree direction. keeping the fluctuation differential pressure of a fluid to balance the pressure difference, and the plug 1 as the basis of concentric flow in an oblique direction of a spiral by causing a vortex effect (vortex) turning part plug (1) the outer diameter from a strong shock wave energy in the fluid have A downstep stage differential pressure type flow control device (9) which reduces the collision of the plug ( 1 ), protects the valve from noise and vibration, and miniaturizes the valve.

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