KR20140136099A - Cylindrical Multi Helical One Step Stage Trim, Flow Control Valve - Google Patents

Abstract

The present invention relates to a valve of a helical one-step trim flow control device. The valve (9) of a helical one-step trim flow control device is classified into two kinds according to high-temperature and high-pressure operational condition of fluid by plant systems, which are 1) a helical one-step trim flow control device (32) of a six-stage cylinder used for controlling a HP level control valve of six inches and 1500 pounds; and 2) a helical one-step trim flow control device (34) of a four-stage cylinder used for controlling a water supply heater level control valve of four inches and 900 pounds for controlling a high-pressure water supply heater. According to the present invention, the valve of a helical one-step trim flow control device can prevent noise and vibration inside the valve by installing a speed reducing trim and absorbing shockwave energy of high-temperature and high-pressure fluid.

Description

[0001] Cylindrical Multi Helical One Step Stage Trim, Flow Control Valve [0002]

If the pressure control range of the valve is large or a high differential pressure is to be controlled by the valve in the operation of the fluid system, the flow rate at the disk and seat of the plug, which is the control throttle of the valve, .

At this time, the valve trim is accompanied by various energy conversion characteristics of the fluid, that is, cavitation, frac- turing or choking, and during this process, the valve trim is damaged on the surface due to continuous impingement of the fluid holder.

Most control valve trim has a difference in degree but the fluid accompanied by high-temperature high-pressure steam over saturated water is subject to damage due to erosion. Periodically check the degree of erosion so as to regularly replace the trim with the pre- It is very severe.

Therefore, the trim in severe operating conditions of the control valve is required not only for wear resistance and internal corrosion but also for strong corrosion resistance.

A globe-type control valve used in a nuclear power plant, a thermal power plant, an oil refining chemical plant, etc., and more particularly, to a spiral one-step trim flow control valve ( 9 ) supplying the flow control apparatus (9) power plant a high temperature of the grid by the fluid, depending on the high-pressure operating conditions are classified into two types, ① 6 dan spiral one-step trim flow control apparatus (32) of the cylinder (feed) or control 6 The control conditions for the HP Level Control Valve are as follows: steam temperature 320 ° C, valve flow 200 ton / hr, shear pressure 145 bar, delta p 2 bar ) ≪ / RTI >

The spiral one- step-trimmed flow control device 34 of the four-stage cylinder is a 4-inch 900-pound feedwater heater level control valve for high-pressure feedwater heat control used to heat the boiler feedwater by extracting steam from the turbine. (FW HTR No. 8 Level Control Valve) The operating conditions are as follows: Steam temperature 287 ° C, valve flow 64 ton / hr, shear pressure 75 bar and ΔP 1.5 bar Used in conditions.

In addition, the rate at which the case of a power plant fluid to the valve to be used for the purpose of flow rate control in the system using the vapor of high temperature and high pressure, by increasing the the number of winding turns (Turn) having multi-stage cylinder and the winding length to form a high pressure difference The pressure reducing type trim is installed to absorb the shock wave energy possessed by the high temperature and high pressure fluid to prevent noise and vibration in the valve. By applying the technique of the present invention, the outer diameter of the flow control device is minimized, To a spiral one-step trim flow control valve ( 9 ) for flow control purposes.

Globe valves for fluid control, ie fluid pressure, temperature, flow and differential pressure control, are commonly referred to as control valves, and there are numerous internal valve (trim) types for control purposes. The type of trim of the control globe valve varies according to the shape characteristics of each trim. However, the control characteristics of the control valve, that is, the control system of the control valve, can be summarized in terms of flow rate and differential pressure. Therefore, the first thing to consider when designing a 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, ie, temperature, pressure, differential pressure in the valve.

The types of trim can be classified into pressure control type and speed control type,

The pressure- controlled trim uses a phenomenon in which a differential pressure is formed while repeating that the fluid passes through the orifice stop and loses pressure and then recovers.

For example , a large number of through holes of 5 ¢ or less are provided on the outer side of the two-stage cylinder structure and the inner cylinder, and a groove (annular chamber, recovery chamber) is provided in the outer cylinder inner diameter portion and the inner cylinder outer diameter portion. It is a representative example of trim.

A speed- controlled trim is a trim that controls the fluid by using pressure loss by passing through a meandering labyrinth by a frictional resistance.

As a representative example, a disk stack is used as a multi-layer disk.

11 (A) and 11 (B) illustrate a forward step-like structure in which about 50% of the flow rate is used, and a stepped flow path, In the worst case, breakage of the inner cylinder occurs very badly. In the worst case, there is a case where plug (1) is plugged up or down due to broken bending, It is true.

The invention differentiate sequential step structure or a curved flow path of the groove form of the prior art as a cylinder structure of a multi-stage, and while forming the differential pressure increase applied to the multi-stage cylinder system of satisfying the large flow rate condition, a combination of a circular hole 12 configuring each of the cylinders so that the overlapping area of overlap of 50%, and source consisting of a circular hole 12 in the six-cylinder in order to increase the differential pressure effect step flow path 22 has six four-cylinder 44 from cylinder 46 , A refinery furnace is formed which overlaps in the form of a descending step, From the third stage cylinder 43, to apply the technique to yeokyu which a fluid is abruptly bent in a 90 degree direction, in the formed of a three-stage cylinder 43 from the first stage an innermost cylinder (41) yeokyu up to overlap the rising step-shaped and it was developed in a spiral one-step trim flow control valve device (9) to form the 6-round hole (12) one-step flow path 22 consisting of a cylinder constituted by a combination of the reverse flow in the refinery.

Ideal flow control or pressure control valves are designed for differential pressure to less than 10% of the pressure before and after the system and make large flow conditions to miniaturize the valve. Therefore, in order to solve the problems of the related art and to improve the performance and extend the life of the valve to save energy, the spiral one-step trim flow control valve 9 valve has become the background of the invention.

11 (A) shows a stepped differential pressure flow path having a three-stage cylindrical structure and temporarily absorbs the shock wave energy of the high-temperature and high-pressure fluid for the purpose of controlling the flow rate.

To the Fig. 11 (B) is there is a respective hole shapes that the cylinder through the 6-cylinder structure in order to increase the differential pressure as a second through-hole of the end structure, and apart from the technique of FIG. 11 (A).

11A is characterized in that a plurality of circular through holes having the same shape are formed on the outer surface of each cylinder by a three-stage cylindrical cylinder structure with a stacking area of about 50% , and a bending in the helical direction It is a stepped Trim that forms a flow path and is suitable for large flow conditions.

In addition, the forward stepwise structure in the spiral direction causes the fluid accompanied by the high temperature and high pressure to swirl around the concentric circle of the plug 1 , causing a vortex effect (vortex) to swing the outer diameter portion of the plug 1 , Has a feature of turning the collision of the plug 1 , and is a technique suitable for large flow rate control by simple fabrication.

Another advantage is that the forward stepped depressurizing (bending) flow path forming a differential pressure with a plurality of cylinder-shaped circular through holes has the advantage that a large number of through holes can be formed in the inner surface area of the fluid (cylinder).

Disadvantages of the prior art of FIG. 11 (A) is a three-stage structure may be slightly bunch for forming the differential pressure, and pressure than the prior art illustrates other in six structures of (B) in Fig. 11 (a differential pressure) is effective (△ = 30kg / ㎠ or more), the minimum number of cylinders must be 4 or more ( more than 4 bending turns). Therefore, the application of the high differential pressure system In the process of maintaining the differential pressure, the problem of frequent occurrence of the problem of maintaining the balanced differential pressure at the rear end of the valve due to expansion or breakage of the outlet flow path of the first-stage innermost cylinder due to steam cutting occurred frequently.

The prior art feature of Fig. 11 (B) is that in order to form a differential pressure with a six-stage cylindrical structure, two through holes (large holes, small holes) of the same shape are formed in a plurality of through holes for each cylinder, each of the cylinders overlapping area of a step-like Trim form a curved flow path of the forward stepwise by 50%.

In addition, the forward stepwise structure in the spiral direction causes the fluid accompanied by the high temperature and high pressure to swirl around the concentric circle of the plug 1 , causing a vortex effect (vortex) to swing the outer diameter portion of the plug 1 , Has a feature of turning the collision of the plug 1 , and is a technique suitable for large flow rate control by simple fabrication.

Another advantage is that the forward stepped depressurizing (bending) flow path forming a differential pressure with a plurality of cylinder-shaped circular through holes has the advantage that a large number of through holes can be formed in the inner surface area of the fluid (cylinder).

The disadvantage of the prior art of Fig. 11 (B) is that, in manufacturing two-step through holes (large holes, small holes) with a large number of through holes for each cylinder, the two- Possibility of mistakes, production costs and production time are high.

A feature of the prior art of Fig. 11 (C) is that it has a five-stage cylindrical cylinder structure, in which a plurality of small slot holes and a large slot hole arrangement are combined on each outer side, A helical Trim .

Another feature is that the shape of the slot hole has an area twice or more than that of the model of the other model, so that the large flow rate supply condition is provided, but the arrangement of the slot hole in the spiral direction is a factor for increasing the production cost. The configuration method is different.

The disadvantage of the prior art of FIG. 11 (C) is that the first, third, and fifth stage cylinders, which are odd-numbered cylinders, are machined into helical slot holes having a small width and the second- The slot hole machining in the helical direction can not be made in the general universal milling, and the slot hole machining in the helical direction can not be performed in the three-dimensional (Machining center), etc., processing cost increase factor and program setting process are added, and the production period takes much time and cost compared to other models.

11 (D) is characterized in that the outermost five-stage cylinder, the intermediate-side three-stage cylinder, and the innermost one-stage cylinder are arranged in a circular hole, and the four-stage intermediate cylinder and the two- This is a two-step trim that is placed in the middle cylinder to generate a breakage due to differential pressure. It has no differential pressure fluctuation and has a very long service life.

Of the prior art Fig. 11 (A) and FIG. 11 (C) is a technology that is much applied to the system to a large flow rate under the condition, of a differentiated present invention and the prior art technique in Fig. 8 and Fig. 3 As shown in the one- step flow paths 22 and 24 composed of the circular holes 12 of the six-stage and the four-stage cylinders, the circular holes and the circular holes are mixed for each cylinder, Thereby increasing the differential pressure effect and developing a spiral one-step trim flow control valve 9 .

In order to develop a spiral one-step trim flow control valve (9) that can secure the above three prior art advantages and be applicable to a variety of valve classes from 600 pounds (LB) to 2500 pounds (LB) However,

Compared with the prior art, the technique of the present invention is to solve the problems of the prior arts as follows. &Quot; While supplying a large flow amount while forming a differential pressure higher and maintaining a balanced differential pressure that does not cause a differential pressure difference, And the technology to miniaturize the valve by minimizing the height of the fluid relative to the outer diameter of the fluid and the driving force (maximum allowable stroke)

Spiral one-step trim flow control system of the valve 9 in the design conditions to minimize the outer diameter size and light weight valve, ① increasing the number of winding turns (Turn) of the flow path of the differential pressure conditions and ② for the plurality of input flow conditions, the outlet passage (3) Prevent bottleneck area (stagnation flow) for fine flow control. Minimize the outer diameter of the flow control device while satisfying the above three conditions, lighten the valve while keeping the proper height so as not to be restricted by the driving stroke do.

In applying the flow control device to the control valve, considering the relationship between the pressure loss structure of the piping system and the pressure loss (differential pressure, ΔP) under high temperature and high pressure operating conditions of the fluid, So as to reduce the weight of the flow control device.

As applied in the present invention, the cylinder type is adopted to satisfy the large flow rate condition "large diameter (10 ¢ or more) circular holes 12 in each cylinder to satisfy a plurality of inlet and outlet flow paths"

Looking out a spiral one-step trim flow control valve device (9) 6-and 4 won consisting of a circular hole 12 of the flow path cylinder step process (22, 24) to form and composition of the features,

The holes formed in the surfaces of the respective cylinders are provided with a plurality of circular holes 12 and are formed in the circular holes 12 of the four-stage cylinder of FIG. 4 and FIG. 8 in order to protect the valves from shock wave energy of high temperature and high pressure In forming the one- step flow paths 22 and 24 , the respective cylinders are constituted so that the overlapping areas are overlapped by 50% (1/2) by the combination of the respective cylinder circular holes 12 and the circular holes 12 ,

Based on the overlapping area of the one-step flow path 22 and 24 shown in Figure 10 in flow direction of the fluid is the fluid source comprised of a circular hole 12 of the cylinder 6 based on the incoming direction into the valve flow path step (22) and it is formed to overlap with the essential oil by lowering stepwise from 6-cylinder 46 by four-stage cylinder 44, From the third stage cylinder 43, to apply the technique to yeokyu which a fluid is abruptly bent in a 90 degree direction, in the formed of a three-stage cylinder 43 from the first stage an innermost cylinder (41) yeokyu up to overlap the rising step-shaped , And a one- step flow path (22) composed of a circular hole (12) of a six-stage cylinder constituted by a combination of the refinery furnace and a reverse flow path,

As shown in FIGS. 4 and 7, the assembling fin through-hole 13 for forming the one- step flow paths 22 and 24 made of the circular holes 12 in the plurality of cylinders has a plurality of cylinder top surfaces (side surfaces) to 4 ¢ provided a through-hole (13) below, and a plurality of cylinder by a pin assembly for a combination to be formed with 6 and 4 won consisting of a circular hole 12 of the step cylinder passage (22, 24) Respectively.

A plurality of circular holes 12 provided on the surfaces of the plurality of cylinders 41 to 46 constituting the spiral one- step-step flow control valve 9 are arranged at a plurality of odd division angles 16 based on the concentric circle of the plug 1 , in the and a structure in which five or more rising arranged in the vertical direction, the plurality of even-numbered divided angle (17) to the structure and arranged in five or more lowered in the vertical direction, bottlenecks (congestion generated during opening rate control operation flow) a one-step flow path (22, 24) have upper and lower spiral one-step which comprises a structure formed of repetition of the staggered stream flow controller valve 9 for preventing.

As shown in FIG. 10, the process of forming the one- step flow path 22 consisting of the circular hole 12 of the six-stage cylinder will be described in detail. The flow direction of the fluid is the outermost 6 An essential oil path is formed from the single cylinder 46 to the four-stage cylinder 44 so as to overlap each other in the form of a descending step, From the third stage cylinder 43, to apply the technique to yeokyu which a fluid is abruptly bent in a 90 degree direction, in the formed of a three-stage cylinder 43 from the first stage an innermost cylinder (41) yeokyu up to overlap the rising step-shaped , A one- step flow path (22) consisting of a circular hole (12) of a six-stage cylinder constituted by a combination of the refinery furnace and a reverse flow path is formed,

The process of forming the one- step flow path 24 including the circular holes 12 of the four-stage cylinder shown in FIG. 10 will be described in detail. The flow direction of the fluid is defined by the direction of the fluid entering the valve, ( 44 ) to the three-stage cylinder ( 43 ) is formed with a refining furnace for overlapping in the form of a descending step, From the third stage cylinder 43, to apply the technique to yeokyu which a fluid is abruptly bent in a 90 degree direction, in the formed of a three-stage cylinder 43 from the first stage an innermost cylinder (41) yeokyu up to overlap the rising step-shaped , A one- step flow path (24) composed of a circular hole (12) of a four-stage cylinder constituted by the combination of the refinery oil path and the reverse flow path is formed,

The spiral one-step trim flow control device valve 9 plant systems by be classified into two types according to the high temperature of the fluid, the high-pressure operating conditions, ① 6 dan spiral circle of the cylinder step trim flow control apparatus 32 is 6 inches 1500 It is used for controlling the HP Level Control Valve of the pound,

The spiral one- step-trimmed flow control device 34 of the four-stage cylinder is used for controlling a 4-inch 900-pound water heater level control valve for a high-pressure water heater (FW HTR No. 8 Level Control Valve) spiral one-step trim flow control device valve 9 by be used to keep the fluctuation differential pressure to balance the pressure difference and give the focus to the stream ruptured portion of the differential pressure loss in the intermediate cylinder 21, the 6-and 4-round hole of the end cylinder (12 The fluid introduced through the one- step flow paths 22 and 24 constituted by the one- step flow paths 22 and 24 is composed of a fluid having shock energy with high destructive force under high temperature and high pressure conditions by an up- The swinging effect (swirl) is generated while the fluctuating differential pressure is kept in the balanced differential pressure and flowing in the diagonal direction of the spiral with reference to the concentric circle of the plug 1, Times by using mitigate collisions of the plug (1) from a strong shock wave energy in the fluid has, the valve protection from noise, vibration, and was developed with a spiral one-step trim flow control valve device (9) to reduce the size of the valve.

The control valve with the spiral one step-step flow control valve 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) at the valve under high temperature and high pressure operating conditions of the fluid To a spiral one- step-trim-flow control valve ( 9 ) having differential pressure conditions and large flow conditions within the valve,

As shown in Figs. 11 (A) and 11 (B), the prior art is characterized in that, when the pressure is lowered to maintain the valve protection, suppression of noise and vibration, and balanced differential pressure of the downstream pressure, A weak point was found in the inner part of the trim (the innermost part of the cylinder) that the breakage or steam cutting was generated most frequently, and the problem that the sting cutting was frequently generated inside the trim was that the pressure difference was not maintained, There arises no problem that the stick (valve operation disabled) phenomenon occurs when the plug 1 is raised or lowered when the cutting is generated.

The structure of the spiral one- step-step flow control valve 9 according to the present invention is such that the flow pressure is maintained while the flow path is turned in the 90-degree direction from the center portion of the trim (middle portion of the cylinder), and the resulting sting cutting is also performed at the center portion It is designed to prevent occurrence of stick phenomenon and to prevent rise of rear end pressure to maintain balanced differential pressure.

Thus, the flow control apparatus (9) power plant systems by be classified into two types according to the high temperature and pressure operating conditions of the fluid, ① 6 dan spiral circle of the cylinder step trim flow control apparatus 32 is eyichipi 6 inch 1500 lbs The operating conditions for the level control valve (HP Level Control Valve) are as follows: steam temperature 320 ° C, valve flow 200 ton / hr, shear pressure 145 bar, and delta P 2 bar .

The spiral one- step-trimmed flow control device 34 of the four-stage cylinder is a 4-inch 900-pound feedwater heater level control valve for high-pressure feedwater heat control used to heat the boiler feedwater by extracting steam from the turbine. (FW HTR No. 8 Level Control Valve) The operating conditions are as follows: Steam temperature 287 ° C, valve flow 64 ton / hr, shear pressure 75 bar and ΔP 1.5 bar Used in conditions.

1 is an overall sectional view in which a spiral one- step-trimmed flow control valve 9 , excluding a driver part, is assembled and mounted on a component in a valve.
FIG. 2 is an isometric perspective view of a six-stage cylindrical circular hole 12 spiral one-step trim 32. FIG.
3 is an isometric perspective view of the flow path shown on the cut side of the six-step six-cylinder circular hole 12 spiral one-step trim 32. FIG.
4 is an isometric perspective view of the one-step cylinder assembled with the first, second, and third stages 41, 42, 43 and the one-step cylinder assembled with the fourth, fifth , and sixth stages 44, 45, 46.
5 is a front view of a six-step cylindrical circular hole 12 helical one-step trim 32. FIG.
6 is a plan view of the six-step cylindrical circular hole 12 helical one-step trim 32 in cross-section direction AA in FIG.
Figure 7 is a four-cylinder circular hole 12 of the other form a spiral one-step stream 34 is an isometric perspective view.
8 is an isometric perspective view of the flow path shown on the cut surface of another type of four-stage cylindrical circular hole 12 helical one-step trim 34. FIG.
9 is a front view of another form of a four-step cylindrical circular hole 12 helical one-step trim 34. [
Left flow path shape of Fig. 10 is a six-round hole (12) one-step passage (22) passage flow and is indicated a hole arrangement isometric view, FIG right flow path shape of the 10 four-circular hole (12) one-step passage of Is an isometric view showing the flow path and hole arrangement of the flow path (24).
11A is an isometric view showing a constant step trim conformal perspective view in a spiral direction constituted by a three-stage cylindrical circular hole and a lower stage is an isometric view showing a flow of a forward stepped channel.
The prior art of FIG. 11 (B) is a six-stage cylinder structure in which each cylinder has a two-stage circular hole in a spiral direction in a constant step-trim conformal perspective view, and the lower stage is an isosceles- .
11C is an isometric view of a helical trim in which a flow path is formed by a combination of a slot hole having a small width and a slot hole having a large width on the surface of each cylinder, It is an isometric view to easily recognize the flow of the flow of the trim.
11 (D) is a five-stage cylinder structure in which the outermost five-stage cylinder, the intermediate three-stage cylinder, and the innermost one-stage cylinder are made of a plurality of circular holes, The cylinder is an isometric perspective view of a downstep stage differential pressure type flow control device 9 which is formed by a slot hole having a small width on the surface and formed by a combination of a circular hole and a slot hole, Is an isometric view that is readily recognizable.

1 is an overall sectional view in which a spiral one- step-trimmed flow control valve 9 , excluding a driver part, is assembled and mounted on a component in a valve.

Figure 2 and Figure 3, 4, 5, 66 a spiral circle of the cylinder shown in a circle composed of the step-stream flow control apparatus (32) 6 circular hole 12 of the short cylinder constituting the step-flow path (22) The process of forming the differential pressure type flow path of FIG.

The shape of the holes provided on the surface of each cylinder constituting the flow control device 9 includes a plurality of circular holes 12 to form a one- step flow path 22 composed of a circular hole 12 of a six- , based on each of the overlapping area of the cylinder the circular hole 12 and a circular hole configuration for each cylinder 12, the overlapping area by the combination to 50% (1/2) of the overlap, and the one-step flow path (22) The fluid flow direction is formed by forming an oil flow path from the six-stage cylinder 46 to the four-stage cylinder 44 in the form of a descending step with reference to the direction in which the fluid enters the valve, A reverse oil passage is formed by overlapping the three-stage cylinder 43 to the first-stage innermost cylinder 41 in an ascending step by applying a reverse-flow technique in which fluid suddenly curves in the direction of 90 degrees from the three-stage cylinder 43 , And a one- step flow path (22) composed of a circular hole (12) of a six-stage cylinder constituted by the combination of the refinery oil path and the reverse flow path is formed.

A plurality of circular holes (12) provided on the plurality of surface cylinder (41 to 46) As shown in Figure the arrangement method according to the divided angle 6 of a one-step flow path 22 of the above, based on the concentric circles of the plug (1) In the multiple odd division angles 16 , five or more upwardly arranged structures are arranged in the vertical direction. In the multiple even division angles 17 , five or more downward arrangement structures are arranged in the vertical direction, One-step flow paths 22 and 24 for preventing stagnation flow generated during operation are formed by repeating upward and downward zigzag .

The pressure differential type flow path of the one- step flow path 24 constituted by the circular holes 12 of the four-stage cylinder constituting the helical one- step-step flow control device 34 of the four-stage cylinder shown in Figs. 7, 8, The process is as follows.

The hole shape provided on the surface of each cylinder constituting the flow control device 9 has a plurality of circular holes 12 to form a one- step flow path 24 composed of a circular hole 12 of a four- , based on each of the overlapping area of the cylinder the circular hole 12 and a circular hole configuration for each cylinder 12, the overlapping area by the combination to 50% (1/2) of the overlap, and the one-step flow path (24) The fluid flow direction is formed by forming an oil path in which the fluid flows from the four-stage cylinder 44 to the three-stage cylinder 43 in the form of a descending step with reference to the direction in which the fluid enters the valve, A reverse oil passage is formed by overlapping the three-stage cylinder 43 to the first-stage innermost cylinder 41 in an ascending step by applying a reverse-flow technique in which fluid suddenly curves in the direction of 90 degrees from the three-stage cylinder 43 , And a one- step flow path (24) composed of a circular hole (12) of a four-stage cylinder constituted by a combination of the refinery oil path and the reverse flow path is formed.

As shown in FIGS. 4, 7 and 8 , the assembly pin through-hole 13 for forming the one- step flow paths 22 and 24 made of the circular holes 12 in the plurality of cylinders has a plurality of A through hole 13 of 4 ¢ or less is provided on the uppermost surface (side surface) of the cylinder, and a plurality of cylinders are combined by the assembly pin to form one step flow path 22 , 24 are formed.

In terms of flow analysis, the design of the fluid piping in the power plant determines the pipe diameter to be less than 5 m / s, the high pressure pipe schedule (SCH.) 160 and the low pressure pipe schedule pipe number .

Speed-controlled trim is recommended to be 50 ft / sec (15.3 m / s) or less when there is no differential pressure before or after the valve,

When there is a differential pressure before or after the valve or when attempting to form a differential pressure for the purposes of valve miniaturization and valve protection, the internal speed of the trim or flow control device 9 is adjusted to 65 ft / sec (20 m / sec) or less.

The following formula for calculating the number of valve flowmeters applies the steam of saturated water temperature condition as follows.

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

The glove type plug 1 is a part that moves the valve plug 1 upward and downward by receiving a driving force by a spring force mounted on a driver in the case of an actuator stem or a fail to close method, Stem is installed through Bonnet Assembly ( 6 ) as a part to control flow rate and pressure according to the opening, closing and opening rate of operating condition.

Valve seat-ring ( 2 ) is a component that is installed for sealing purposes, to prevent fluid leakage when the plug is seated in the valve body.

The packing box 5 is a part that blocks the fluid from leaking out of the bonnet through the valve stem. The packing material is classified into a wide range of materials such as a wiper packing, a Teflon, a graphite mold packing ring [Graphite Mold Packing Rings], and carbon bushings [Carbon Sleeves].

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

Down-flow type, the flow-to-close (Down Flow, Flow to close) (14) is a pipe and a valve body (Body) (7) of the installation direction is 1 chajjok pressure of the fluid valve body of the valve plug (disk) in the closing direction And the fluid flows.

The upflow type flow-to-open type valve 15 has a structure in which the installation direction of the piping and the valve body 7 is such that the primary pressure of the fluid flows in the direction of opening the valve plug And a flow path through which the fluid flows.

DESCRIPTION OF REFERENCE NUMERALS
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 (Body)
9: Spiral One Step Trim Flow Control Valve
12: Thru Holes
13: Pin hole for assembly
14: Down Flow (Flow to close)
15: Up Flow (Flow to open)
16: odd division angle
17: even division angle
22: source consisting of six circular holes 12 of the single flow path cylinder step
24: a one- step flow path consisting of a circular hole 12 of a four-
32: 6-spiral circle of the cylinder step trim flow control device
34: 4-speed spiral circle of the cylinder step trim flow control device
41: 1st stage inner cylinder
42: Two-stroke cylinder
43: Three-stage cylinder
44: Four-stroke cylinder
45: 5-speed cylinder
46: 6-speed cylinder

Claims (3)

In applying the flow control device to the control valve, the differential pressure condition and the large flow condition are satisfied 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 operating conditions of the fluid A helical one step-trim flow control valve ( 9 )

The flow control device 9 is classified into two types according to the high temperature and high pressure operating conditions of the fluid in each power plant system. ( 1 ) The spiral one step step flow control device 32 of the six-stage cylinder has a 6 inch 1500 pound- It is used for controlling the HP Level Control Valve. It is operated at steam temperature of 320 ° C, valve flow rate of 200 ton / hr, shear pressure of 145 bar and ΔP 2 bar. do.
The spiral one- step-trimmed flow control device 34 of the four-stage cylinder is a 4-inch 900-pound feedwater heater level control valve for high-pressure feedwater heat control used to heat the boiler feedwater by extracting steam from the turbine. (FW HTR No. 8 Level Control Valve) The operating conditions are as follows: Steam temperature 287 ° C, valve flow 64 ton / hr, shear pressure 75 bar and ΔP 1.5 bar Used in conditions.

The holes formed on the surface of each cylinder are provided with a plurality of circular holes 12, and one- step flow passages 22, 22 constituted by circular holes 12 of six-stage and four-stage cylinders for protecting the valve from high- as it forms a 24), including that the respective configurations of each of the cylinders overlapping area by combining 50% (1/2) of the cylinder so as to overlap a circular hole 12 and the circular hole 12,

The one-step flow path, based on the overlapping area of the flow path direction of the fluid flow path one step (22) consisting of a six-round hole 12 of the cylinder relative to the incoming direction of the fluid into the valve 22 and 24 is 6-Cylinder (46) to the four-stage cylinder (44) is formed with a refining furnace which overlaps with each other in the form of a descending step, From the third stage cylinder 43, to apply the technique to yeokyu which a fluid is abruptly bent in a 90 degree direction, in the formed of a three-stage cylinder 43 from the first stage an innermost cylinder (41) yeokyu up to overlap the rising step-shaped , A one- step flow path (22) consisting of a circular hole (12) of a six-stage cylinder constituted by a combination of the refinery furnace and a reverse flow path is formed,

The assembling fin through hole 13 for forming the one- step flow paths 22 and 24 constituted by the circular holes 12 in the plurality of cylinders is provided with a through hole 13 of 4 ¢ or less on the uppermost surface And a step of forming a one- step flow path ( 22 , 24 ) composed of circular holes (12) of six-step and four-step cylinders by combining a plurality of cylinders by an assembly pin,

6 , the plurality of circular holes 12 provided on the surfaces of the plurality of cylinders 41 to 46 constituting the spiral one- step-step flow control valve 9 are arranged in the form of a plurality of circular holes 12 on the basis of the concentric circle of the plug 1 in the odd-numbered divided angle (16), and a structure in which five or more rising arranged in the vertical direction, the plurality of even-numbered divided angle (17) to the structure and arranged in five or more lowered in the vertical direction, bottlenecks (opening ratio during control operation generated stagnant flow) one-step flow path (22, 24) for preventing the upper and lower spiral one-step trim comprises a structure formed of repetition of the zigzag flow control device valve 9 The method according to claim 1,
The fluid drawn through the one- step flow paths 22 and 24 constituted by the circular holes 12 of the six-stage and four-stage cylinders is subjected to a high-temperature, high-pressure A swirling effect is generated while flowing in the diagonal direction of the spiral with respect to the concentric circle of the plug 1 while keeping the differential pressure of the fluid with the shock wave energy having a strong destructive force of the condition at a balanced differential pressure so that the outer diameter portion of the plug 1 is turned A spiral one- step-trimmed flow control valve 9 for relieving the impact of the plug 1 from the strong shock wave energy of the fluid and protecting the valve against noise and vibration, The method according to claim 1,
The spiral one-step trim flow control device valve 9 plant systems by be classified into two types according to the high temperature of the fluid, the high-pressure operating conditions, ① 6 dan spiral circle of the cylinder step trim flow control apparatus 32 is 6 inches 1500 It is used for controlling the HP Level Control Valve of the pound,
The spiral one- step-trimmed flow control device 34 of the four-stage cylinder is used for controlling a 4-inch 900-pound water heater level control valve for a high-pressure water heater (FW HTR No. 8 Level Control Valve) Spiral One Step Trim Flow Control Valve ( 9 )

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