CN113007415B - Low flow resistance flange cast steel straight cut-off valve - Google Patents
Low flow resistance flange cast steel straight cut-off valve Download PDFInfo
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- CN113007415B CN113007415B CN202110300292.0A CN202110300292A CN113007415B CN 113007415 B CN113007415 B CN 113007415B CN 202110300292 A CN202110300292 A CN 202110300292A CN 113007415 B CN113007415 B CN 113007415B
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- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 10
- 239000000945 filler Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 6
- 210000004907 gland Anatomy 0.000 claims description 6
- 229920000544 Gore-Tex Polymers 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012856 packing Methods 0.000 description 7
- 230000007123 defense Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to a low flow resistance flange cast steel straight-through stop valve, which comprises a valve body, a valve disc, a valve rod and a valve cover, wherein a medium inlet and a medium outlet are respectively arranged on two sides of the valve body; the inner cavity of the valve body is provided with a plurality of circular arc transitions from the medium inlet to the medium outlet. The invention has advanced design, reasonable structure, good sealing effect and long service life, meets the requirement of the system on the flow resistance coefficient of the straight-through stop valve, reduces the medium energy loss caused by the structure of the system, reduces the medium circulation resistance, reduces the interference on the medium flow, and can reduce the flow resistance coefficient by less than 50 percent under the condition that the valve disc is opened at a constant height.
Description
Technical Field
The invention belongs to the technical field of valves, and relates to a low-flow-resistance flange cast steel straight-through stop valve.
Background
With the continuous development of shipbuilding technology and national defense safety requirements, china must continuously improve the overall operational capacity of ships, and thus, higher requirements are also put forward on the overall system of the ships.
The valve is an important device in a ship system, and the performance and the quality of the valve play a very important role in a pipeline system. The performance parameters of the valve, such as tightness, reliability, low flow resistance and the like, can directly influence the reliability of the ship and even influence the fight force. The flow resistance coefficient of a valve is one of the important indicators for measuring the power consumption in a pipe system, and when flowing through the valve of the pipe system, a local resistance is generated, and excessive energy is required to overcome the resistance. Because of the structural characteristics and the excellent performance of the flange cast steel straight-through stop valve, the flange cast steel straight-through stop valve cannot be replaced by other valves in a ship system, and particularly in a fuel oil pipeline system of the ship. The internal structure of the valve body cavity of the conventional flange cast steel straight-through stop valve is characterized in that: the medium flows in from the inlet in the horizontal direction, then changes to the vertical direction, flows through the sealing surface of the middle opening, then changes to the horizontal direction from the vertical direction, and finally flows out from the outlet, and the pressure loss caused by the flowing mode is large, and particularly in a hydraulic device, the pressure loss is obvious due to high flow resistance. Valves are part of a pipe system and a change in resistance of one element can cause a change or redistribution of resistance throughout the system, i.e. the medium flow through the pipe sections is interactive. In order to reduce the energy loss in a pipeline system, in order to improve the national equipment manufacturing level, particularly in the national defense field of ships and the like, the flow resistance coefficient of the flange cast steel straight-through stop valve is required to be reduced, the energy consumption is reduced, and the open sea combat capability of ships and the like is enhanced, so that the method has important significance for national defense of our country.
The flow resistance coefficient of the flange cast steel straight cut-off valve used at present is much larger than that of a gate valve and a ball valve, and is generally about 4-10 or even larger according to different nominal calibers. As shown in fig. 5, which is a schematic diagram of the valve body structure of the flange cast steel straight-through stop valve in the prior art, the radian and chamfer of the internal structure of the valve body are not paid enough attention in the prior art. In order to reduce the flow resistance coefficient of the flange cast steel straight-through stop valve and reduce the energy loss caused by the defect of self equipment design in a pipeline system, the valve structure must be optimized again according to domestic technical strength and industrial basis, and the required high-performance product is developed. Therefore, development of a new flange cast steel straight-through stop valve is necessary according to the requirements of new types of equipment.
Disclosure of Invention
Object of the Invention
The invention provides a low-flow-resistance flange cast steel straight-through stop valve in a pipeline system, which can meet the requirements of low flow resistance coefficient and high flow coefficient.
Technical proposal
The low flow resistance flange cast steel straight-through stop valve comprises a valve body, a valve disc, a valve rod and a valve cover, wherein a medium inlet and a medium outlet are respectively arranged on two sides of the valve body, the upper end of the valve body is fixedly connected with the valve cover, the valve cover vertically penetrates through the valve rod, the valve disc is fixedly arranged at the lower end of the valve rod, the valve disc can isolate the medium inlet from the medium outlet, and the central lines of the medium inlet and the medium outlet are coincident; the inner cavity inlet section of the valve body is bent downwards from the medium inlet and is bent and transited to two outer sides, the arc radius of the lower side and the two sides is R 11, and the arc radius of the upper side is R 3; The inner cavity of the valve body is bent upwards and two sides are bent towards the middle for transition, the radius of the arc on the two sides is R 8, the radius of the arc on the upper side is R 2, and the radius of the arc on the lower side is R 4; then, taking the arc radius R 4 as a guide line and taking R 10 as a contour to carry out upward bending transition; Then, the arc radius of the lower side of the inner cavity middle opening section of the valve body is R 5, the arc radius is R 5, and the line radius before rounding is R 9; then the circumference is transited upwards by an arc radius R 1, and the arc radius R 1 is tangent to the central lines of the medium inlet and the medium outlet; then vertically and upwardly transiting; then the outlet section of the inner cavity of the valve body obliquely downwards takes the arc radius R 6 as a guide line and takes the obliquely downwards straight line as the guide line for transition; and finally, transiting to the medium outlet by using the arc radius R 7. The valve cover comprises an upper traversing structure and a lower traversing structure, a valve rod nut is fixed on the inner periphery of the traversing structure on the upper side of the valve cover in a threaded manner, the valve rod is in threaded fit with the valve rod nut, a sealing ring and a filler are arranged on the inner periphery of the traversing structure on the lower side of the valve cover, the sealing ring is located on the lower side of the filler, and a filler gland is fixed on the upper side of the filler.
The upper end of the valve rod is provided with a square opening, and a hand wheel is fixed outside the square opening.
And a set screw is screwed between the valve cover and the valve rod nut.
The filler comprises an upper layer and a lower layer, wherein the filler of the upper layer and the lower layer is woven by 100% GORE-TEX fibers, and the filler of the middle layer is woven by 100% GFO fibers.
The diameter of the inner cavity middle opening section of the valve body is d 1, the diameters of the medium inlet and the medium outlet are DN, the distance between the outer end surfaces of the medium inlet and the medium outlet is L, the lifting height of the valve disc is H,R1：8-18mm,R2：28-42mm,R3：80-150mm,R4：86-235mm,R5：3-8mm,R6：90-190mm,R7：20-45mm,R8：55-650mm or no round angle ,R9：38-120mm,R10：37.5-130mm,R11：35-45mm,H：22-60mm,L：290-600mm,d1：Φ73-Φ220mm,, wherein H is 1/4-1/3 of d 1, and d 1 = 110% -DN-115% -DN.
Advantages and effects
The invention has advanced design, reasonable structure, good sealing effect and long service life, meets the requirement of the system on the flow resistance coefficient of the straight-through stop valve, reduces the medium energy loss caused by the structure of the system, reduces the medium circulation resistance, reduces the interference on the medium flow, and can reduce the flow resistance coefficient by less than 50 percent under the condition that the valve disc is opened at a constant height.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
FIG. 1 is a schematic view of the overall assembly structure of the present invention;
FIG. 2 is a schematic front view of a valve body;
FIG. 3 is a schematic view of a valve body in left side view, A-A, in half cross section;
FIG. 4 is a schematic top view of the valve body;
Fig. 5 is a schematic diagram of the structure of a valve body of a prior art flange cast steel straight cut-off valve.
Reference numerals illustrate: 1. valve body, 2, valve disc, 3, valve rod, 4, valve cover, 5, packing, 6, packing gland, 7, valve rod nut, 8, hand wheel, 9, square mouth, 10, set screw, 11, sealing ring, 12, gasket, 13, sealing ring, 14, gland bolt, 15, valve cover bolt, 16, medium inlet, 17, medium outlet.
Detailed Description
As shown in fig. 1, 2,3 and 4, the low flow resistance flange cast steel straight-through stop valve comprises a valve body 1, a valve disc 2, a valve rod 3 and a valve cover 4, wherein a medium inlet 16 and a medium outlet 17 are respectively arranged on two sides of the valve body 1, the upper end of the valve body 1 is fixedly connected with the valve cover 4 through a valve cover bolt 15, a gasket 12 is arranged between the valve cover 4 and the valve body 1, the valve cover 4 vertically penetrates through the valve rod 3, the lower end of the valve rod 3 is fixedly provided with the valve disc 2, the lower end of the valve disc 2 is provided with a sealing ring 13 used for contacting and sealing with the valve body 1, the valve cover 4 comprises an upper penetrating structure and a lower penetrating structure, a valve rod nut 7 is fixedly arranged on the inner circumference of the penetrating structure on the upper side of the valve cover 4, a set screw 10 is screwed between the valve cover 4 and the valve rod nut 7, for reinforcing the connection between the bonnet 4 and the valve stem nut 7, preventing the valve stem nut 7 from rotating. The valve rod 3 is in threaded fit with the valve rod nut 7, the inner periphery of the passing structure of the lower side of the valve cover 4 is provided with a sealing ring 11 and a packing 5, the sealing ring 11 is positioned on the lower side of the packing 5, the upper side of the packing 5 is connected with the valve cover 4 through a gland bolt 14 to be fixed with a packing gland 6, and the functions of the packing 5 and the sealing ring 11 are to prevent media from leaking through the valve rod 3. The filler 5 comprises an upper layer and a lower layer, the filler of the upper layer and the lower layer is woven by 100% GORE-TEX fiber, and the filler of the middle layer is woven by 100% GFO fiber. The upper end of valve rod 3 is equipped with square mouth 9, and square mouth 9 external fixation has hand wheel 8, and square mouth 9's upper end is the threaded rod, and hand wheel 8 is fixed through the nut of screw in on the threaded rod. The valve disc 2 can isolate the medium inlet 16 from the medium outlet 17, and the center lines of the medium inlet 16 and the medium outlet 17 are coincident; the inner cavity inlet section of the valve body 1 is downwards bent from the medium inlet 16 and is bent and transited to two outer sides, the arc radius of the lower side and the two sides is R 11, and the arc radius of the upper side is R 3; the inner cavity of the valve body 1 is bent upwards and two sides are bent towards the middle for transition, the radius of the circular arc at the two sides is R 8, the radius of the circular arc at the upper side is R 2, and the radius of the circular arc at the lower side is R 4; Then, taking the arc radius R 4 as a guide line and taking R 10 as a contour to carry out upward bending transition; then, the arc radius of the lower side of the inner cavity middle opening section of the valve body 1 is R 5, the arc radius is R 5, and the line radius before rounding is R 9; Then the circumference is transited upwards by an arc radius R 1, and the arc radius R 1 is tangent to the central lines of the medium inlet 16 and the medium outlet 17; then vertically and upwardly transiting; then the outlet section of the inner cavity of the valve body 1 is obliquely downwards used as a guide line with the arc radius R 6, and is transited by using an obliquely downwards straight line as the guide line; finally, the medium is transited to the medium outlet 17 by an arc radius R 7.
The diameter of the inner cavity middle opening section of the valve body 1 is D 1, the diameters of the medium inlet 16 and the medium outlet 17 are DN, the diameters of the outer flanges of the medium inlet 16 and the medium outlet 17 are D, the distance from the central line of the medium inlet 16 and the medium outlet 17 to the top end of the valve body 1 is H 1, the distance from the outer end surface of the medium inlet 16 and the medium outlet 17 is L, the height capable of being lifted by the valve disc 2 is H,R1：8-18mm,R2：28-42mm,R3：80-150mm,R4：86-235mm,R5：3-8mm,R6：90-190mm,R7：20-45mm,R8：55-650mm or no round angle ,R9：38-120mm,R10：37.5-130mm,R11：35-45mm,H：22-60mm,L：290-600mm,d1：Φ73-Φ220mm,, wherein H is 1/4-1/3 of D 1, D 1 = 110% -DN-115% -DN.
Working principle: in fig. 1G and K represent the height symbols engraved on the valve cover 4 for reference to the lifting height of the valve stem 3 as a reference. The hand wheel 8 is rotated to drive the valve rod 3 to rotate, so that the valve disc 2 can move up and down along the axis of the sealing surface of the valve seat, and the valve disc can be opened or closed in a pipeline, and a medium flows out from the medium outlet 17 after passing through the medium inlet 16 and the medium outlet sealing surface.
The flow resistance coefficient of the straight-through stop valve is related to the size and structure of a product and the geometric shape of a medium internal flow passage, and can be considered to be divided into four resistance stages from an inlet to an outlet through a large number of finite element analysis and experimental calculation, namely: the inlet section, the middle port sealing section, the middle cavity section and the outlet section, so the pressure head loss in the valve is approximately equal to the sum of the pressure head losses of the various stages of the valve. The key of influencing the flow resistance coefficient of the flange cast steel straight-through stop valve is the flow passage structure of the valve body and the shape of the valve seat. A large number of analyses are carried out on the traditional straight-through stop valve through a finite element method, and positions of the valve, which affect medium flow under the full-open condition, are found out, so that local head loss is large, and further structural optimization design is carried out, namely: the flow passage area of the inlet section of the valve body is gradually increased, all sections of the flow passage are smoothly transited, each intersection point is tangential, as shown in figures 2, 3 and 4, the R 10 (R represents a round angle and the numerical value represents a serial number) in the section A-A is tangential to the vertical inner wall surface; the horizontal center line of the middle opening section of the valve body coincides with the lower end surface of the sealing opening, and the lower end surfaces are rounded off into R 1 and R 5; a mid-port seal section; the diameter of the middle cavity section is slightly larger than that of the sealing port; the outlet section is tangent to the middle cavity, smoothly transits, and the flow passage area is gradually reduced to the outlet area; the burrs and sharp corners of the inner cavity are polished smoothly, and the natural color of the metal is exposed. The purpose of the design is to reduce the interference of the valve to the fluid and the pressure difference at two ends due to the self structural characteristics of the straight-through stop valve, so as to reduce the flow resistance coefficient, finally reduce the energy loss and promote the power supply of the system.
As shown in Table 1, compared with the traditional flange cast steel straight-through stop valve, the low-flow resistance flange cast steel straight-through stop valve reduces system energy consumption, improves medium circulation capacity, and can be widely applied to pipeline systems of naval vessel equipment, aerospace, petroleum industry, nuclear power and the like.
Table 1 flange cast steel straight-through stop valve optimization front and rear flow resistance coefficient versus table
As shown in table 2, the 7 optimized flow resistance coefficients ζ in table 1 correspond to the respective critical dimension values in table 2.
TABLE 2 values of various important dimensions for optimized parameters
| Sequence number | DN | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | R10 | R11 | H | L | d1 | H |
| 1 | 65 | 8 | 35 | 80 | 86 | 3 | 100 | 20 | - | 38 | 37.5 | 40 | 22 | 290 | 75 | 22 |
| 2 | 80 | 8 | 30 | 82 | 100 | 3 | 90 | 35 | 55 | 48 | 55 | 38 | 24 | 310 | 90 | 24 |
| 3 | 100 | 8 | 30 | 93 | 130 | 3 | 90 | 35 | 65 | 60 | 65 | 35 | 30 | 350 | 110 | 30 |
| 4 | 125 | 11 | 28 | 100 | 146 | 3 | 132 | 38 | 395 | 76 | 82 | 38 | 40 | 400 | 140 | 41 |
| 5 | 150 | 14 | 35 | 120 | 172 | 3 | 150 | 35 | 382 | 90 | 101 | 40 | 44 | 480 | 165 | 44 |
| 6 | 175 | 14 | 35 | 135 | 198 | 5 | 150 | 38 | 608 | 102 | 110 | 38 | 50 | 540 | 195 | 50 |
| 7 | 202 | 18 | 42 | 150 | 235 | 8 | 190 | 45 | 650 | 120 | 130 | 45 | 60 | 600 | 222 | 50.5 |
Note that: the nominal caliber DN meets the tolerance requirement of the standard GB/T6414-2014 casting dimensional tolerance, geometric tolerance and machining allowance, and the method is adoptedThe structural length meets the requirement of the standard GB/T12221 Metal valve structural length-Flange connection valve structural length basic series. DN and d 1 in the table are diameters.
It should be understood that the foregoing embodiments of the present invention are merely illustrative of the present invention and not limiting, and that various other changes and modifications can be made by one skilled in the art based on the above description, and it is not intended to be exhaustive of all embodiments, and all obvious changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (2)
1. The utility model provides a low flow resistance flange cast steel straight-through stop valve, includes valve body (1), valve disc (2), valve rod (3) and valve gap (4), and the both sides of valve body (1) are equipped with medium entry (16) and medium outlet (17) respectively, and the upper end fixedly connected with valve gap (4) of valve body (1), valve gap (4) are vertical to pass has valve rod (3), and the lower extreme of valve rod (3) is fixed with valve disc (2), and valve disc (2) can be with isolated opening of medium entry (16) and medium outlet (17), its characterized in that: the centre lines of the medium inlet (16) and the medium outlet (17) are coincident; the inner cavity inlet section of the valve body (1) is downwards bent from the medium inlet (16) and is bent and transited to two outer sides, the arc radius of the lower side and the two sides is R 11, and the arc radius of the upper side is R 3; The inner cavity of the valve body (1) is bent upwards and two sides are bent towards the middle for transition, the radius of the arc on the two sides is R 8, the radius of the arc on the upper side is R 2, and the radius of the arc on the lower side is R 4; then, taking the arc radius R 4 as a guide line and taking R 10 as a contour to carry out upward bending transition; Then, the arc radius of the lower side of the inner cavity middle opening section of the valve body (1) is R 5, the arc radius is R 5, and the line radius before rounding is R 9; then the circle is transited upwards by an arc radius R 1, and the arc radius R 1 is tangent to the central lines of the medium inlet (16) and the medium outlet (17); Then vertically and upwardly transiting; then, the outlet section of the inner cavity of the valve body (1) obliquely downwards takes the arc radius R 6 as a contour and takes an obliquely downwards straight line as a guide line for transition; finally, the arc radius R 7 is used for transition to the medium outlet (17);
The valve cover (4) comprises an upper traversing structure and a lower traversing structure, wherein a valve rod nut (7) is fixed on the inner periphery of the traversing structure on the upper side of the valve cover (4) through threads, the valve rod (3) is in threaded fit with the valve rod nut (7), a sealing ring (11) and a filler (5) are arranged on the inner periphery of the traversing structure on the lower side of the valve cover (4), the sealing ring (11) is positioned on the lower side of the filler (5), and a filler gland (6) is fixed on the upper side of the filler (5);
A set screw (10) is screwed between the valve cover (4) and the valve rod nut (7);
the filler (5) comprises an upper layer and a lower layer, wherein the filler of the upper layer and the filler of the lower layer are woven by 100% GORE-TEX fibers, and the filler of the middle layer is woven by 100% GFO fibers;
The diameter of the inner cavity middle opening section of the valve body (1) is d 1, the diameters of the medium inlet (16) and the medium outlet (17) are DN, the distance between the outer end surfaces of the medium inlet (16) and the medium outlet (17) is L, the lifting height of the valve disc (2) is H,R1：8-18mm,R2：28-42mm,R3：80-150mm,R4：86-235mm,R5：3-8mm,R6：90-190mm,R7：20-45mm,R8：55-650mm or no round angle ,R9：38-120mm,R10：37.5-130mm,R11：35-45mm,H：22-60mm,L：290-600mm,d1：Φ73-Φ220mm,, wherein H is 1/4-1/3 of d 1, d 1 =110%DN-115%DN.
2. The low flow resistance flange cast steel straight through shut-off valve of claim 1, wherein: the upper end of the valve rod (3) is provided with a square opening (9), and a hand wheel (8) is fixed outside the square opening (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110300292.0A CN113007415B (en) | 2021-03-22 | 2021-03-22 | Low flow resistance flange cast steel straight cut-off valve |
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| CN202110300292.0A CN113007415B (en) | 2021-03-22 | 2021-03-22 | Low flow resistance flange cast steel straight cut-off valve |
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| CN113007415B true CN113007415B (en) | 2024-06-25 |
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| CN215521985U (en) * | 2021-03-22 | 2022-01-14 | 抚顺职业技术学院 | Low flow resistance flange cast steel straight-through stop valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE69912651T2 (en) * | 1999-12-21 | 2004-09-30 | Sanjeev Maini | VALVE |
| CN103511635A (en) * | 2012-06-26 | 2014-01-15 | 江苏兴亚船用阀门有限公司 | Flange cast steel through shut-off valve |
| CN105782464A (en) * | 2016-05-30 | 2016-07-20 | 江苏金晟元特种阀门股份有限公司 | Direct current type full-lining stop valve for chloro-alkali |
| CN206958352U (en) * | 2017-06-19 | 2018-02-02 | 浙江精嘉阀门有限公司 | High Temperature Pressure Power Station Globe Valves |
| CN211924901U (en) * | 2020-03-27 | 2020-11-13 | 荆门美中美阀门有限公司 | Self-sealing stop valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN215521985U (en) * | 2021-03-22 | 2022-01-14 | 抚顺职业技术学院 | Low flow resistance flange cast steel straight-through stop valve |
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