CN215521985U - Low flow resistance flange cast steel straight-through stop valve - Google Patents
Low flow resistance flange cast steel straight-through stop valve Download PDFInfo
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- CN215521985U CN215521985U CN202120573666.1U CN202120573666U CN215521985U CN 215521985 U CN215521985 U CN 215521985U CN 202120573666 U CN202120573666 U CN 202120573666U CN 215521985 U CN215521985 U CN 215521985U
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Abstract
The utility model 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; from the medium inlet to the medium outlet, the inner cavity of the valve body has a plurality of circular arc transitions. The utility model 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 in a pipeline system, reduces the medium flow resistance, reduces the interference on the medium flow, and can reduce the flow resistance coefficient by less than 50 percent under the condition of unchanged opening height of the valve disc.
Description
Technical Field
The utility model 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 and development of shipbuilding technology and the need of national defense safety, China must continuously improve the overall operational capacity of the naval vessels, thus providing higher requirements for the overall system of the naval vessels.
The valve is an important device in a naval vessel system, and the performance and the quality of the valve play an important role in a pipeline system. The performance parameters of the valve, such as tightness, reliability, low flow resistance and the like, directly influence the reliability of the naval vessel and even influence the fighting capacity. The flow resistance coefficient of a valve is one of the important indicators for measuring the power consumption in a pipe system, and when a flowing medium flows through the valve of the pipe system, a local resistance is generated, and the resistance is overcome, so that excessive energy is consumed. Due to 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 naval vessel system, particularly in a fuel pipeline system of the naval vessel. The internal structure of the valve body cavity of the conventional flange cast steel straight-through stop valve is characterized in that: the pressure loss caused by the flowing mode is large, particularly in a hydraulic device, because the pressure loss is obvious due to high flow resistance. The valve is part of a pipe system, and a change in the resistance of one element causes a change or redistribution of the resistance in the overall system, i.e. the media flow through the pipe sections is influenced by each other. In order to reduce energy loss in a pipeline system and improve the equipment manufacturing level of the country, particularly in the field of national defense such as ships and warships, the flow resistance coefficient of the flange cast steel straight-through stop valve must be reduced, energy consumption is reduced, and the far-sea fighting capacity of the ships is enhanced, which has important significance for national defense of our country.
The flow resistance coefficient of the flange cast steel straight-through stop valve used at present is much larger than that of a gate valve and a ball valve, and generally the flow resistance coefficient is about 4-10 or even larger according to the difference of nominal caliber. As shown in FIG. 5, the valve body structure of the prior art cast steel straight-through stop valve is a schematic diagram, and the prior art has not paid enough attention to the radian and chamfer angle of the internal structure of the valve body. 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 insufficient design of the equipment in a pipeline system, the valve structure must be re-optimized according to the domestic technical strength and the industrial foundation to develop the required high-performance product. Therefore, it is necessary to develop a new cast steel straight-through stop valve according to the requirements of new type equipment.
SUMMERY OF THE UTILITY MODEL
Purpose of the utility model
In order to solve the problem of high flow resistance coefficient of the flange cast steel straight-through stop valve in the prior art, the utility model provides the 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 scheme
A 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 inlet section of the inner cavity of the valve body is bent downwards from the medium inlet and is bent and transited to two outer sides, and the radius of the circular arc at the lower side and the two sides is R11Radius of upper arc is R3(ii) a The inner cavity of the valve body is bent upwards and the two sides are bent and transited to the middle part, and the radius of the circular arc at the two sides is R8And the radius of the upper arc is R2Circle of lower sideArc radius of R4(ii) a Then with the radius of the circular arc R4As a guide line, with R10The profile is in upward bending transition; then the radius of the circular arc at the lower side of the middle opening section of the inner cavity of the valve body is R5Transition with arc radius R5Line radius before rounding is R9(ii) a Then the circle has a circular arc radius of R1Upward transition with a circular arc radius of R1Is tangential to the centre lines of the medium inlet and the medium outlet; then making a transition vertically upwards; then the inner cavity outlet section of the valve body is inclined downwards with a circular arc radius R6Is a guide line, and takes a downward straight line as a guide line for transition; finally, the radius of the arc is R7And (4) transitioning to a medium outlet. The valve gap contains upper and lower two structures of passing through, and the internal peripheral screw thread of the structure of passing through of valve gap upside is fixed with the valve rod nut, and valve rod nut screw-thread fit, the internal peripheral of the structure of passing through of valve gap downside are equipped with sealing ring and filler, and the sealing ring is located the downside of filler, and the upside of filler is fixed with gland.
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 structure and a lower layer structure, the fillers of the upper layer and the lower layer are woven by 100% GORE-TEX fibers, and the fillers of the middle layer are woven by 100% GFO fibers.
The diameter of the middle opening section of the inner cavity of the valve body is d1The diameters of the medium inlet and the medium outlet are DN, the distance between the outer end faces of the medium inlet and the medium outlet is L, and the height which can be lifted by the valve disc is H and 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: phi 73-phi 220mm, wherein H is d11/4-1/3, d1＝110％DN～115％DN。
Advantages and effects
The utility model 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 in a pipeline system, reduces the medium flow resistance, reduces the interference on the medium flow, and can reduce the flow resistance coefficient by less than 50 percent under the condition of unchanged opening height of the valve disc.
Drawings
The utility model is further described with reference to the following figures and detailed description. The scope of the utility model is not limited to the following expressions.
FIG. 1 is a schematic view of the overall assembly structure of the present invention;
FIG. 2 is a schematic front view of the valve body;
FIG. 3 is a schematic left view A-A of a valve body in half section;
FIG. 4 is a schematic top view of the valve body;
fig. 5 is a schematic structural diagram of a valve body of a flange cast steel straight-through stop valve in the prior art.
Description of reference numerals: 1. the valve comprises a valve body, a valve disc 2, a valve rod 3, a valve cover 4, a packing 5, a packing gland 6, a valve rod nut 7, a hand wheel 8, a square opening 9, a set screw 10, a sealing ring 11, a gasket 12, a sealing ring 13, a gland bolt 14, a valve cover bolt 15, a medium inlet 16 and a medium outlet 17.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3 and fig. 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 rod 3 vertically penetrates through the valve cover 4, the valve disc 2 is fixed at the lower end of the valve rod 3, a sealing ring 13 used for being in contact sealing with the valve body 1 is arranged at the lower end of the valve disc 2, the valve cover 4 comprises an upper penetrating structure and a lower penetrating structure, a valve rod nut 7 is fixed on the inner peripheral thread of the penetrating structure on the upper side of the valve cover 4, and a set screw 10 is screwed between the valve cover 4 and the valve rod nut 7 for reinforcing the connection between the valve cover 4 and the valve rod nut 7 and preventing the rotation of the valve rod nut 7. Valve stem 3 andvalve rod nut 7 screw-thread fit, the interior week of structure of walking of valve gap 4 downside is equipped with sealing ring 11 and packing 5, and sealing ring 11 is located the downside of packing 5, and the upside of packing 5 is fixed with gland 6 through gland bolt 14 connection valve gap 4, and the effect of packing 5 and sealing ring 11 is to prevent that the medium from leaking through valve rod 3. The filler 5 comprises an upper layer and a lower layer, the fillers of the upper layer and the lower layer are woven by 100 percent GORE-TEX fibers, and the fillers of the middle layer are woven by 100 percent GFO fibers. The upper end of the valve rod 3 is provided with a square opening 9, a hand wheel 8 is fixed outside the square opening 9, the upper end of the square opening 9 is a threaded rod, and the hand wheel 8 is fixed through a nut screwed in the threaded rod. The valve disc 2 can isolate the medium inlet 16 from the medium outlet 17, 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 bent downwards from the medium inlet 16 and is bent and transited to two outer sides, and the arc radiuses of the lower side and the two sides are R11Radius of upper arc is R3(ii) a The inner cavity of the valve body 1 is bent upwards and the two sides are bent and transited to the middle part, and the radius of the circular arc at the two sides is R8And the radius of the upper arc is R2The radius of the arc on the lower side is R4(ii) a Then with the radius of the circular arc R4As a guide line, with R10The profile is in upward bending transition; the radius of the circular arc at the lower side of the middle opening section of the inner cavity of the valve body 1 is R5Transition with arc radius R5Line radius before rounding is R9(ii) a Then the circle has a circular arc radius of R1Upward transition with a circular arc radius of R1Tangential to the centre lines of the medium inlet 16 and the medium outlet 17; then making a transition vertically upwards; then the inner cavity outlet section of the valve body 1 is inclined downwards with a circular arc radius R6Is a guide line, and takes a downward straight line as a guide line for transition; finally, the radius of the arc is R7Transitioning to the media outlet 17.
The diameter of the middle opening section of the inner cavity of the valve body 1 is d1The 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, and 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 H1The distance between the outer end faces of the medium inlet 16 and the medium outlet 17 is L, the height which the valve disc 2 can lift 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: phi 73-phi 220mm, wherein H is d11/4-1/3, d1＝110％DN～115％DN。
The working principle is as follows: in fig. 1, G and K represent height symbols engraved on the valve cover 4 for reference of the lift height of the valve stem 3 as a reference. The rotary hand wheel 8 can drive the valve rod 3 to rotate, so that the valve disc 2 can do lifting motion along the axis of the sealing surface of the valve seat, the valve disc has an opening and closing function in a pipeline, namely opening or closing, and a medium flows out from the medium outlet 17 through the medium inlet 16 and the middle sealing surface.
The flow resistance coefficient of the straight-through stop valve is related to the size and the structure of a product and the geometric shape of a flow passage in a medium, and is obtained through a large number of finite element analysis and experiments, the inner cavity of the valve body is divided into four resistance stages from an inlet to an outlet, namely: the inlet section, the middle sealing section, the middle cavity section and the outlet section, so that the head loss in the valve is approximately equal to the sum of the head losses of all the stages of the valve. The key influencing the flow resistance coefficient of the flange cast steel straight stop valve lies in the flow passage structure of the valve body and the shape of the valve seat. Carry out a large amount of analyses to traditional through stop valve through the finite element method, find out the valve under the full-open condition, which positions influence the medium and flow, it is great to produce local head loss, and then carry out structure optimal design, promptly: the area of the flow passage at the inlet section of the valve body is gradually increased, the sections of the flow passage are in smooth transition, and each intersection point is tangent, as shown in figures 2, 3 and 4, R in the section A-A10(R represents a fillet, and the numerical value represents a serial number) must be tangent to the vertical inner wall surface; the horizontal central line of the middle opening section of the valve body coincides with the lower end surface of the sealing opening, and the lower end surface is rounded1And R5(ii) a A middle opening sealing section; the diameter of the middle cavity section is slightly larger than that of the sealing opening; the outlet section is tangent to the middle cavity, smooth transition is realized, and the flow passage area is gradually reducedTo the exit area; and (4) polishing burrs and sharp corners of the inner cavity smoothly to expose the natural color of the metal. 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, further reduce the flow resistance coefficient, finally reduce the energy loss and improve the power supply of the system.
As shown in table 1, compared with the conventional flange cast steel straight-through stop valve, the low-flow-resistance flange cast steel straight-through stop valve reduces the energy consumption of the system, improves the medium flow capacity, and can be widely applied to pipeline systems such as naval vessel equipment, aerospace, oil industry and nuclear power.
TABLE 1 optimized front and back flow resistance coefficient pair of flange cast steel straight-through stop valve
As shown in Table 2, the 7 optimized coefficients ξ of flow resistance in Table 1 correspond to the important dimensional values in Table 2.
TABLE 2 important dimensional values corresponding to the optimized parameters
Note: the nominal caliber DN meets the tolerance requirements of casting dimensional tolerance, geometric tolerance and machining allowance of standard GB/T6414-2014
The structure length meets the requirements of the standard GB/T12221 basic series of metal valve structure length-flange connection valve structure length. DN and d in the table1Is the diameter.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the utility model, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and obvious changes and modifications included in the technical solutions of the present invention are within the scope of the present invention.
Claims (6)
1. The utility model provides a low flow resistance flange cast steel through stop valve, including valve body (1), valve disc (2), valve rod (3) and valve gap (4), the both sides of valve body (1) are equipped with medium entry (16) and medium export (17) respectively, the upper end fixedly connected with valve gap (4) of valve body (1), valve gap (4) are vertical to be passed there is valve rod (3), the lower extreme of valve rod (3) is fixed with valve disc (2), valve disc (2) can be with medium entry (16) and medium export (17) isolated division, its characterized in that: the centre lines of the medium inlet (16) and the medium outlet (17) are coincident; the inlet section of the inner cavity of the valve body (1) is bent downwards from the medium inlet (16) and is bent and transited to two outer sides, and the radius of the circular arc at the lower side and the two sides is R11Radius of upper arc is R3(ii) a The inner cavity of the valve body (1) is bent upwards and the two sides are bent and transited to the middle part, and the radius of the circular arcs at the two sides is R8And the radius of the upper arc is R2The radius of the arc on the lower side is R4(ii) a Then with the radius of the circular arc R4As a guide line, with R10The profile is in upward bending transition; the radius of the circular arc at the lower side of the middle opening section of the inner cavity of the valve body (1) is R5Transition with arc radius R5Line radius before rounding is R9(ii) a Then the circle has a circular arc radius of R1Upward transition with a circular arc radius of R1Is tangential to the centre lines of the medium inlet (16) and the medium outlet (17); then making a transition vertically upwards; then the inner cavity outlet section of the valve body (1) is inclined downwards with a circular arc radius R6Taking a straight line which is inclined downwards as a profile and transiting by taking the straight line as a guide line; finally, the radius of the arc is R7And the transition is carried out towards the medium outlet (17).
2. The low flow resistance flanged cast steel straight-through stop valve as claimed in claim 1, wherein: valve gap (4) contain upper and lower two department structure of passing through, valve rod nut (7) are fixed with in the interior circumference screw thread of the structure of passing through of valve gap (4) upside, valve rod (3) and valve rod nut (7) screw-thread fit, are equipped with sealing ring (11) and filler (5) in the interior circumference of the structure of passing through of valve gap (4) downside, and sealing ring (11) are located the downside of filler (5), and the upside of filler (5) is fixed with gland (6).
3. The low flow resistance flanged cast steel straight-through stop valve as claimed in claim 2, 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).
4. The low flow resistance flanged cast steel straight-through stop valve as claimed in claim 2, wherein: and a set screw (10) is screwed between the valve cover (4) and the valve rod nut (7).
5. The low flow resistance flanged cast steel straight-through stop valve as claimed in claim 2, wherein: the filler (5) comprises an upper layer structure and a lower layer structure, the fillers of the upper layer and the lower layer are woven by 100% GORE-TEX fibers, and the fillers of the middle layer are woven by 100% GFO fibers.
6. The low flow resistance flanged cast steel straight-through stop valve as claimed in claim 1, wherein: the diameter of the middle opening section of the inner cavity of the valve body (1) is d1The diameters of the medium inlet (16) and the medium outlet (17) are DN, the distance between the outer end faces of the medium inlet (16) and the medium outlet (17) is L, the height which can be lifted by the valve disc (2) is H, and R is1：8-18mm，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: phi 73-phi 220mm, wherein H is d11/4-1/3, d1＝110％DN～115％DN。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120573666.1U CN215521985U (en) | 2021-03-22 | 2021-03-22 | Low flow resistance flange cast steel straight-through stop valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120573666.1U CN215521985U (en) | 2021-03-22 | 2021-03-22 | Low flow resistance flange cast steel straight-through stop valve |
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| CN215521985U true CN215521985U (en) | 2022-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007415B (en) * | 2021-03-22 | 2024-06-25 | 抚顺职业技术学院 | Low flow resistance flange cast steel straight cut-off valve |
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2021
- 2021-03-22 CN CN202120573666.1U patent/CN215521985U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007415B (en) * | 2021-03-22 | 2024-06-25 | 抚顺职业技术学院 | Low flow resistance flange cast steel straight cut-off valve |
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