CN203335872U - Secondary sealing stop valve - Google Patents
Secondary sealing stop valve Download PDFInfo
- Publication number
- CN203335872U CN203335872U CN2013201625612U CN201320162561U CN203335872U CN 203335872 U CN203335872 U CN 203335872U CN 2013201625612 U CN2013201625612 U CN 2013201625612U CN 201320162561 U CN201320162561 U CN 201320162561U CN 203335872 U CN203335872 U CN 203335872U
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- Prior art keywords
- valve
- spool
- sealing
- seal
- sealing area
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
- F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The utility model discloses a secondary sealing stop valve which comprises a valve body (15), a valve rod (7), valve elements (3) and a valve seat assembly. The secondary sealing stop valve is characterized in that the valve elements and the valve seat assembly are arranged in the valve body (15) and are communicated with an inlet and an outlet of the valve body (15) to form a fluid channel where fluids enter from the top and flow out from the bottom, the lower portion of the valve seat assembly is provided with a first sealing surface, the upper portion of the valve seat assembly is provided with a second sealing surface, the valve elements include the first valve element (3) and the second valve element (5), the first valve element (3) and the second valve element (5) are coaxially sleeved and can relatively slide, the first valve element (3) is matched with the first sealing surface to form primary sealing, the second valve element (5) is matched with the second sealing surface to form secondary sealing, and a sealing cavity capable of being sealed is formed between the first sealing surface and the second sealing surface. The secondary sealing stop valve has the advantages of being good in sealing effect, simple in structure, easy and convenient to operate, convenient to maintain, long in service life and the like.
Description
Technical field
The utility model relates to a kind of valve, particularly a kind of secondary seal stop valve.
Background technique
Stop valve also claims isolating valve, refers at a time, ducted medium is blocked or make the valve of medium circulation, is widely used in electric power, oil, chemical industry, the industries such as Aeronautics and Astronautics.Be divided into high-temperature high pressure valve by purposes, medium temperature and medium pressure valve and low-temp low-pressure valve, be divided into hard sealing and soft seal by the sealing surface material.The working pressure of low-temp low-pressure valve is generally below 2.5MPa, and maximum temperature is generally 150 degree left and right.Its spool, valve seat mostly adopt nonmetallic material, adopt the sealed material of soft seal.The plasticity of soft seal is large, and good sealing effect is arranged, and manufactures simply, and cost is low, but intensity difference, under the working state that contains impurity at medium or after long-time the use, easily distortion, aging, poorly sealed, working life is not long.In addition, the soft seal material can't adapt to usage requirement under high temperature and high pressure condition, is unable to undergo to wash away, destroy.And high-temperature high pressure valve generally can only adopt the primary seal form of hard sealing, sealing surface structure is conical surface seal, plane sealing or ball face sealing etc.
When above-mentioned high-temperature high pressure valve is used in the High Temperature High Pressure system, due to severe working condition, once have impurity on sealing surface or damage arranged, or valve body is with temperature, STRESS VARIATION and changing, make the valve seat shape also produce deformation thereupon and become ellipticity, or surface roughness is bad, be washed very soon, cavitation erosion, once have, wash away, valve can be destroyed within the extremely short time, in producing, leak, start to produce the valve of interior leakage, wash away more and more severe, cause making up, save, lose valve function, due to medium in high temperature, high pressure, large flow rate regime, before and after valve, pressure reduction is large, its only being sealed in together under above-mentioned bad working environments is easier to lose efficacy, working life is very short, not only to the user, bring great economic loss, but also there is great potential safety hazard.
On the other hand, the aspects such as above-mentioned valve processing cost also have problems: one sealed high-temp high-pressure stop valve exists following shortcoming: A, the independent part of spool for can independently processing as the aforementioned, but valve seat adopts the special material built-up welding on valve body, then forms processing, processing difficulties, deep hole is difficult to built-up welding, valve body built-up welding place heat treatment is very difficult, and sealing surface adopts special substance machining difficulty, and cost is high, even after machining, its measurement, the check also very inconvenient.B, can not repair online, washing away serious valve must repair welding, then machining, and therefore, valve must cut off from pipeline, on lathe, process, and built-up welding, heat treatment, reprocessing, difficulty is very large, expense is high, engineering time is long, can not meet consumers' demand.
Be provided with the sealing effect that Multi-level sealing structure can significantly improve valve, but how it can tightly turn-off and smooth opening, especially High Temperature High Pressure hard sealing structure valve used, its raising of spending orientation problem, operability and working life is the technical problems that those skilled in the art constantly explore always.The mistake orientation problem more stages soft seal of especially multistage hard sealing more is difficult to resolve certainly.For soft sealing valve, its two-stage spool, valve seat directly can overcome location by nonmetal distortion, its material, manufacture require also relatively simple, cost is lower, as the Chinese patent that number of patent application is 200580032809.1, it adopts the two-stage soft seal, and MEDIA FLOW is to being high in and low out, the spool material adopts rubber plate, and valve seat is ordinary metallic material.Rubber plate as the two-stage spool is coaxial with valve rod, but first order spool and valve rod are to be flexibly connected, the second spool is that cutting ferrule coordinates with valve rod, therefore do not form and contact directly between two spools, during valve closing, the solenoid valve dead electricity, rely on the pressure of medium itself and the elastic compression second valve central layer of spring, second valve central layer and valve rod down promote first order spool simultaneously and compress valve seat, realize sealing, and the two-stage spool is almost to contact with valve seat simultaneously.During valve opening, solenoid valve obtains electric, on valve rod, move, spring-compressed, spring and the step of first order spool and valve rod head play time-lag action, in the situation that overcome spring force, first open the second spool, the second spool and valve rod move on continuing, and jointly pull first order spool to lift off a seat, and realize valve opening.But there is following problem in it: the first spool and the second spool and valve seat are poor short time of contact, and two-stage spool and valve rod coaxality are poor, and deviation each and that valve seat offsets is large, although two-stage is sealed on same valve rod, but, when pressure is higher, greatly, sealing effect is poor for rubber plate intensity difference, distortion.During valve opening, the second spool will overcome the effect of pressure medium and elastic force, and the amount that the second spool and valve seat are opened is limited, affects flow.For large bore valves, because medium adopts the high in and low out mode, while driving valve, the rubber plate area is large, and the pressure born is large, and solenoid valve needs enough large lifting force, and the valve rod axially loaded is also large simultaneously, easily damages component, and working life is not long.Therefore above-mentioned Multi-stage sealing valve be only suitable for that pressure medium is low, temperature also low occasion use.
A kind of " three grades of sealing erosion prevention cut-off valves " arranged in prior art, and it is to make three kinds of multi-form sealing surfaces on same cross section, and spool, valve seat all adopt hard sealing.There is following problem in it: three grades of seal form more easily produced location, caused the sealing surface location inaccurate; Seal bad; Processing, manufacture difficulty, maintenance difficult, more can't repair online, and cost is high.
The model utility content
The purpose of this utility model: be the deficiency for prior art, a kind of secondary seal stop valve is provided, it has good sealing effect, simple in structure, easy and simple to handle, easy to maintenance, the characteristics such as long service life.
The technical solution of the utility model is:
This secondary seal stop valve, comprise valve body 15, valve rod 7, spool 3 and valve component, it is characterized in that, described spool, valve component is arranged in valve body 15, import and export with valve body 15 fluid passage that UNICOM forms bottom in and top out, described valve component bottom is provided with primary sealing area, top is provided with secondary sealing area, described spool comprises coaxial fit, but the first spool 3 of relative sliding and the second spool 5, described the first spool 3 coordinates the sealing of the formation first order with primary sealing area, described the second spool 5 coordinates the sealing of the formation second level with secondary sealing area, form closed Seal cage between described primary sealing area and secondary sealing area.
As to further improvement of the utility model, described the first spool 3 and the coaxial shrink-fit structure of the second spool 5 are: described the second spool 5 lower ends are provided with the guide rod 19 through described the first spool 3 center holes; The relative sliding of described the first spool 3 and the second spool 5 is controlled as meeting the second sealing prior to the first unseal by being sheathed on the outer elastomer stage clip of guide rod 19 13, lags behind the requirement of the first seal closure.
As to further improvement of the utility model, described the second spool 5 is the curved surface sealing surface with the fitting surface of secondary sealing area, and described the first spool 3 is plane sealing face or curved surface sealing surface with the fitting surface of primary sealing area.
As to further improvement of the utility model, described the first spool 3 has from primary sealing area and coaxially extends and be placed in the shutoff ring 20 outside guide rod 19 along guide rod 19; The length of described shutoff ring 20 and guide rod 19 meets the requirement that can stretch under the valve closing state in the entrance of described valve component fluid passage.
As to further improvement of the utility model, described shutoff ring 20 lower ends are provided with and are placed in shutoff ring 20 and are sheathed on the outer locking nut 14 of guide rod 19, and described locking nut 14 lower end surfaces are the crown sphere that diameter is less than valve component fluid passage entrance internal diameter; The lower end surface of described guide rod 19 is sphere, between described the first spool 3 and guide rod 19, by flexible graphite packing B17, realizes radial seal.
As to further improvement of the utility model, described valve component is detachable the connection with valve body 15, described valve component is by fixing with detachable fixing fitting seat 6 pressure holdings of valve body 15, described fitting seat 6 has the inner chamber be connected with the valve component Seal cage, the top of described fitting seat 6 is provided with valve rod fitting seat 6, described valve rod fitting seat 6 is provided with flexible graphite packing C18 to realize the sealing of fitting seat 6 bore seal and valve rod 7, is provided with flexible graphite packing A (16) between described valve seat 2 and valve body 15 and realizes radial seal.
As to further improvement of the utility model, described valve component is columnar structured, the inner chamber of described fitting seat 6 is cylindrical shape and is coaxial docking with the valve component Seal cage, described primary sealing area is the plane sealing face be arranged in valve component lower shaft tangent plane, the secondary sealing area of described valve component is the conical seal surface that is arranged at edge on valve component, on the sidewall of described fitting seat 6 cylindrical cavities, is provided with the fluid output be communicated with valve body 15; Described the second spool 5 is controlled in fitting seat 6 inner chambers and is slided by valve rod 7, and described the first spool 3 slides in the Seal cage of valve component, realizes that the unlatching of fluid passage is with closed.
As to further improvement of the utility model, described valve component comprises disc valve seat 2 and the cylindrical shape seal ring 4 of lower end pressure holding on described valve seat 2 embedded in valve body 15, described seal ring 4 upper ends and fitting seat 6 lower ends offset, and internal diameter approximately is less than the internal diameter of fitting seat 6 inner chambers so that upper-end surface forms internal conical surface, the outer surface of described the second spool 5 lower ends is the outer conical surface coordinated with seal ring 4, and the lower surface of the upper surface of described valve seat 2 and the first spool 3 forms the primary sealing area of plane sealing.
As to further improvement of the utility model, described secondary seal stop valve is the hard sealed stop valve of High Temperature High Pressure, and the equal built-up welding of internal conical surface of described the first spool 3 lower surfaces and valve seat 2 upper surfaces, the second spool 5 outer conical surface and seal ring 4 has the sealing layer of cemented carbide material.
As to further improvement of the utility model, described secondary seal stop valve is the low-temp low-pressure valve, and the sealing surface of described spool, valve seat 2 is the soft seal layer, and described soft seal layer material is rubber or teflon.
As to further improvement of the utility model, when the nominal diameter DN of described secondary seal stop valve is 10-100mm, spring free length L
1for 0.65-0.8DN, spring compresses rear height L fully
2for 0.5-0.6DN, the height difference H of described primary sealing area and secondary sealing area
1for 1.2-1.5DN, the open amount H of spool
2for 3-3.5DN, when the nominal diameter DN of described secondary seal stop valve is 100-300mm, spring free length L
1for 0.8-1.0DN, spring compresses rear height L fully
2for 0.6-0.7DN, the height difference H of primary sealing area and secondary sealing area
1for 1.4-1.5DN, the open amount H of spool
2for 1.5-2.DN.
The beneficial effects of the utility model are:
Secondary seal stop valve provided by the utility model, be provided with the secondary seal structure on the fluid passage of bottom in and top out due to it, the secondary seal structure can form the Seal cage of sealing, be conducive to improve sealing effect, in using process, can be by the control to sealing chamber forming process, the effective control of realization to valve closing and opening process medium pressure, after the end face and valve component primary sealing area fitted seal of the first spool, fluid passage is closed substantially, now in Seal cage substantially without media flow, without pressure reduction, the second spool coordinates with the secondary sealing area of valve component afterwards, again realize sealing, play leading seal action.Second level curved surface sealing state is good, can realize tight shutoff, can protect again first order sealing, so the utility model can realize extremely strong sealing effect, and long service life, especially is adapted to use under pressure reduction is large before and after valve operating mode.But spool of the present utility model adopts the first spool and second spool of coaxial fit relative sliding, by same valve rod, driven, with the two seals face of coaxial setting, coordinate respectively, be conducive to the process control that Seal cage forms, easy to operate, simple in structure, manufacture cost is lower.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
The structural representation that Fig. 2 is the utility model spool.
Fig. 3 is the structural representation of opening position of the present utility model.
Fig. 4 is working principle schematic diagram of the present utility model.
In figure: 1-high pressure sealing pad I, 2-valve seat, the 3-the first spool, 4-seal ring, the 5-the second spool, 6-fitting seat, 7-valve rod, 8-bolt connection piece, 9-handwheel, 10-nut, 11-valve rod fitting seat, 12-high pressure sealing pad II, 13-stage clip, 14-locking nut, 15-valve body, 16-flexible graphite packing A, 17-flexible graphite packing B, 18-flexible graphite packing C, 19-guide rod, 20-shutoff ring.
Embodiment
Clearer for technical problem, technological scheme and beneficial effect that model utility is solved, below in conjunction with drawings and Examples, model utility is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain model utility, and be not used in the restriction model utility.
Embodiment 1:
A kind of secondary seal stop valve, as shown in Figures 1 to 4, be the hard sealed stop valve of High Temperature High Pressure that nominal size is DN50, comprise valve body 15, valve rod 7, spool and valve component, valve body 15 materials are 1Cr18Ni9Ti, and the import center of valve body 15 and export center are in the same horizontal line.Valve component is arranged in valve body 15, import and export with valve body 15 fluid passage that UNICOM forms bottom in and top out, the valve component bottom is provided with primary sealing area, top is provided with secondary sealing area, spool comprises coaxial fit, but the first spool 3 of relative sliding and the second spool 5, the body material of the first spool 3 and the second spool 5 is preferably stainless steel, the first spool 3 coordinates the formation plane sealing with primary sealing area, the second spool 5 coordinates the formation conical surface seal with the secondary sealing area of valve component, form closed Seal cage between primary sealing area and secondary sealing area.
In the utility model, the first spool 3 and the coaxial shrink-fit structure of the second spool 5 are: the second spool 5 lower ends are provided with the guide rod 19 through the center hole of the first spool 3; The relative sliding of the first spool 3 and the second spool 5 is controlled by being sheathed on the outer elastomer stage clip of guide rod 19 13, and the material of stage clip 13 is the INCONELX-750 refractory alloy.
In the present embodiment, the first spool 3 has from primary sealing area and coaxially extends and be placed in the shutoff ring 20 outside guide rod 19 along guide rod 19; Be provided with flexible graphite packing B17 between the first spool 3 and guide rod 19 and realize radial seal.Elastomer stage clip 13 is arranged at the axial clearance between the lower surface of the upper surface of the first spool 3 and the second spool 5, guide rod 19 pressure sealing ring 4 centers are through also stretching in valve seat 2 runner imports, shutoff ring 20 can stretch in valve seat 2 runner imports in company with guide rod 19, and the length of shutoff ring 20 and guide rod 19 meets the requirement that can stretch into when valve closing in the entrance of valve component fluid passage.
In the present embodiment, shutoff ring 20 lower ends also are provided with in shutoff ring 20 and are sheathed on the locking nut 14 outside guide rod 19, to being arranged at the flexible graphite packing B17 radial compaction sealing between the first spool 3 and guide rod 19.Described locking nut 14 can coaxially be fixed in the first spool 3 lower surfaces with shutoff ring 20, described locking nut 14 also can be fixed in shutoff ring 20 lower ends with shutoff ring 20 internal surface threaded connection modes, as shown in Figure 4, described locking nut 14 lower end surfaces are the crown sphere that diameter is less than valve component fluid passage entrance internal diameter; The lower end surface of guide rod 19 is similarly sphere, the STL cemented carbide of equal built-up welding resistance to erosion on the crown sphere of the sphere of guide rod 19 and locking nut 14.
In the present embodiment, valve component is detachable the connection with valve 15, and valve component is by fixing with detachable fixing fitting seat 6 pressure holdings of valve body 15, and fitting seat 6 has the inner chamber be connected with the valve component Seal cage.Further, the detachable connecting structure of valve component and valve body 15 can be following structure, but is not limited to this.
Particularly, valve component is columnar structured, the inner chamber of fitting seat 6 is cylindrical shape and is coaxial docking with the valve component Seal cage, primary sealing area is arranged in the axial section of valve component bottom, the secondary sealing area of valve component is arranged at the top of valve component, on the sidewall of fitting seat 6 cylindrical cavities, is provided with the fluid output be communicated with valve body 15; The second spool 5 is controlled in fitting seat 6 inner chambers and is slided by valve rod 7, and the first spool 3 slides in the Seal cage of valve component, realizes that the unlatching of fluid passage is with closed.
In the utility model, the parameter of described valve component, the first spool 3, the second spool 5 and the relevant parameter of stage clip 13 are determined according to relevant parameters such as the nominal diameter of valve, working pressures.When the nominal diameter DN of described secondary seal stop valve is 10-100mm, the free length L of stage clip 13
1for 0.65-0.8DN, height L after stage clip 13 compresses fully
2for 0.5-0.6DN, the height difference H of described primary sealing area and secondary sealing area
1for 1.2-1.5DN, the open amount H of spool
2for 3-3.5DN.When the nominal diameter DN of described secondary seal stop valve is 100-300mm, stage clip 13 free length L
1for 0.8-1.0DN, height L after stage clip 13 compresses fully
2for 0.6-0.7DN, the height difference H of primary sealing area and secondary sealing area
1for 1.4-1.5DN, the open amount H of spool
2for 1.5-2.DN.
In the present embodiment, the distance after the two-stage sealing seals fully is 62mm, the free length L of stage clip 13
1when satisfied the first spool 3 contacts with primary sealing area, the distance of the second spool 5 lower end conical surface seal faces and the second sealing surface of seat is the requirement of 13.6-16mm, and the compression fully of stage clip 13 is height L afterwards
2be about 24mm, after guaranteeing that the second spool, valve seat seal fully, stage clip 13 is compressed to 26-27mm length simultaneously, and therefore, after the second level has sealed, stage clip 13 should stay 2-3mm to continue decrement, to guarantee the tight seal of sealing surface.In the present embodiment, during valve closing, the first sealing is first closed, and after the second sealing, closes.During valve opening, the second sealing is first opened, and after the first sealing, opens, and guarantees that two seals has successively been moved the regular hour poor.
Valve component can be following structure, but be not limited to this, particularly, valve component comprises disc valve seat 2 and the cylindrical shape seal ring 4 of lower end pressure holding on valve seat 2 embedded in valve body 15, seal ring 4 upper ends and fitting seat 6 lower ends offset, and internal diameter is less than the internal diameter of fitting seat 6 inner chambers, the upper-end surface of seal ring 4 is internal conical surface, the outer surface of the second spool 5 lower ends is outer conical surface, the secondary sealing area formed is conical surface seal, the upper surface of valve seat 2 is plane (being the axial section of seal ring 4), the primary sealing area formed with the lower surface of the first spool 3 is plane sealing.Built-up welding STL cemented carbide on the internal conical surface of valve seat 2 upper surfaces and seal ring 4.
The top of fitting seat 6 is provided with valve rod fitting seat 11, in the present embodiment, fitting seat 6 is provided with outer bulge loop, by this outer bulge loop and valve rod fitting seat 11 with valve body 15 is superimposed and be fixed into one by bolt connection piece 8, make valve rod fitting seat 11 along axial upright extension of fitting seat 6, valve rod fitting seat 11 is provided with flexible graphite packing C18 with the sealing that realizes fitting seat 6 inner chambers and the sealing of valve rod; Be provided with high pressure sealing pad II 12 on the radial engagement face of valve rod fitting seat 11 and fitting seat 6.
Be filled with flexible graphite packing A16 between seal ring 4 and valve body 15, be provided with high pressure sealing pad I 1 between valve seat 2 and valve body 15, in the present embodiment, high pressure sealing pad I 1 and high pressure sealing pad II 12 are all to add the graphite packing coiling by the 1Cr18Ni9Ti Stainless Steel Band to form, guarantee that the high pressure sealing pad had not only had good intensity, but also had certain plasticity, can effectively avoid the problem of location.Filler in flexible graphite packing A16 and flexible graphite packing B17 is all that graphite packing adds the braided packing composition.
Be fixed with trapezoidal thread nut 10 on valve rod fitting seat 11, valve rod 7 is two sections formula structures, and valve rod 7 lower ends are connected with the second spool 5 screw thread cutting ferrules, and left trapezoid thread is arranged in the upper end of valve rod 7.Be provided with the anti-rotation block that prevents valve rod 7 rotations on valve rod 7.Therefore, valve rod 7 left trapezoid threads coordinate with copper trapezoidal nut 10, and handwheel 9 drives nut 10 rotations moves up and down valve rod 7, can be also that electric actuator drives nut 10 rotations, valve rod 7 is slide type with respect to the motion of valve body 15, by anti-rotation block, prevents that valve rod 7 from rotating.
Therefore, the utility model low in and high out passage concrete structure is: valve component bottom is provided with the fluid inlet UNICOM (hang down into) of fluid inlet and valve body 15, the fluid inlet of valve component is specially the center hole of valve seat 2, be provided with fluid output (exceeding) on fitting seat 6 cylindrical cavity sidewalls, link with the fluid passage of valve body 15, form the low in and high out fluid passage.As shown in Figure 1, A point on fitting seat 6 cylindrical cavity sidewalls enters seal point for second level spool, the second spool 5 is controlled in cylindrical shape fitting seat 6 inner chambers and is slided by valve rod 7, the first spool 3 coaxial sleeves are located on the second spool 5 and in the Seal cage of valve component and are slided, and realize that the unlatching of fluid passage is with closed.
The utility model is work like this:
Valve opening: be rotated counterclockwise handwheel 9, nut 10 is rotated counterclockwise, left-handed thread valve rod 7 moves up, now, the first spool 3 is because the chip hold down of stage clip 13 can not promote rapidly in the very first time, so primary sealing area can not open immediately, and at the elastic force F of stage clip 13
bulletwith screw mandrel lifting force F
bareffect under, the second spool 5 takes the lead in separating with the second cross section sealing ring 4, first opens secondary seal.When valve rod 7 carries, the second spool 5 moves on constantly, stage clip 13 elastic force F
bulletwhile reducing gradually, at hydrodynamic pressure F
be situated betweenwith valve rod 7 lifting force F
barunder the effect of making a concerted effort, by the first spool 3 and the formed spool integral jacking of stage clip 13, i.e. F
be situated between+ F
bar>F
bulletthe time, the first spool 3 separates with valve seat 2, opens primary seal.Cutoff hole is opened after crossing the A point in the lower end surface of the second spool 5, and medium is in circulation status, and when the upper-end surface of the second spool 5 reaches fitting seat 6 endoporus tops, valve is opened fully.As shown in Figure 3, stage clip 13 free length L
1for 37.6mm, mangetic core assembly open amount H
2for 157mm.
Valve closing: the handwheel 9 that turns clockwise, trapezoidal nut 10 is clockwise rotated, left-handed thread valve rod 7 moves down, the second spool 5 moves downward, and stage clip 13 starts compression, and elastic force increases gradually, (now between two spools apart from 0.65-0.8DN) at this moment because medium thrust F
be situated betweenbe greater than elastic force F
bullet, i.e. F
be situated between>F
bullet, the first spool 3 wouldn't move.Along with mangetic core assembly moves down, at first the crown spherical surface body of locking nut 14 and guide rod 19 spheres enter in the runner of valve seat 2 endoporus, runner import sectional area diminishes, formed " damming " in " barrier lake ", play dam, the effect of step-down, simultaneously, because guide rod 19 and locking nut 14 front ends are sphere, medium is when axially rushing at sphere, and above-mentioned sphere can make the active force of medium produce scattering, has played good buffer function.In addition, before two-stage sealing unsealing, " damming " still moves down, and formed medium circulation is more and more less, alleviated the pressure of two-stage sealing.Along with the first spool 3 moves down with valve seat 2, contact afterwards, the first spool 3 is increasing with the power that valve seat 2 offsets, and the second spool 5 is at fitting seat 6 inner chamber down slidings, after entering the A point, and valve rod 7 thrust F
barbe greater than elastic force F
bullet, as elastic force F
bulletwith valve rod 7F
barquite, and the two be greater than again with joint efforts medium thrust F
be situated betweenthe time, i.e. F
bar+ F
bullet>F
be situated between, now stage clip 13 constantly compresses, and the lower surface of the first spool 3 and the primary sealing area of valve component are that the upper surface of valve seat 2 forms plane sealing, complete first order sealing.After first order hermetically closing, the second spool 5 is the distance that seal ring 4 also has 0.2-0.3DN with the secondary sealing area of valve component, and before the second level is sealed in unsealing, stage clip 13 still has certain decrement, and stage clip 13 can also compressed 2-3mm.When the second spool 5 continues descendingly under the effect of valve rod 7, in this process, stage clip 13 still, in compression, and meets F
bullet>F
be situated between, again due to F
bar>F
bullet, until contacting, the internal conical surface that the second spool 5 is seal ring 4 upper ends with the secondary sealing area of valve component forms conical surface seal, complete sealing for the second time.As shown in Figure 4, now, after valve closing, the about 24mm of height after stage clip 13 compression, two sealing surfaces apart from 62mm.
In a word, secondary seal stop valve provided by the utility model, be provided with the secondary seal structure on the fluid passage of bottom in and top out due to it, the secondary seal structure can form the Seal cage of sealing, be conducive to improve sealing effect, in using process, can be by the control to sealing chamber forming process, the effective control of realization to valve closing process medium pressure, after the end face and valve component primary sealing area fitted seal of the first spool, fluid passage is closed substantially, now in Seal cage substantially without media flow, without pressure reduction, the second spool coordinates with the secondary sealing area of valve component afterwards, again realize sealing, play leading seal action.Second level curved surface sealing state is good, can realize tight shutoff, can protect again first order sealing; therefore the utility model can be realized extremely strong sealing effect, also avoids two seals to be washed simultaneously, simultaneously destroyed; long service life, especially be adapted to use under pressure reduction is large before and after valve operating mode.But spool of the present utility model adopts the first spool and second spool of coaxial fit relative sliding, by same valve rod, driven, with the two seals face of coaxial setting, coordinate respectively, be conducive to the process control that Seal cage forms, the good concentricity of two spools, can solve the integrity problem in the Reusability process, easy to operate, simple in structure, cost is lower.
In the utility model, the top seal face of Seal cage is defined as the curved surface sealing, no matter the lower seal face is plane or curved surface sealing, all can be in certain scope the concentricity of capable of regulating curved surface sealing, the sealing effect of two sealing surfaces can be guaranteed simultaneously, makes the sealing effect of two sealing surfaces all in tight state.
Further, the utility model arranges stage clip at the first spool and the second valve core chamber, can make the motion of two spools form organic connections, realizes interactive, effectively control closing sequence and the time interval of two sealing surfaces, guarantee closing or the satisfied design in opening time interval needs of two sealing surfaces.In the utility model, during valve closing, the sealing of the first of bottom is first closed, afterwards the second hermetically closing on top.During valve opening, the second sealing is first opened, and after the first sealing, opens, and therefore, no matter valve is open or close, and the second sealing is protected all the time.
Because two place's sealing surfaces all adopt metal wound gasket as sealing gasket, the sealing pad is than other hard sealed materials in prior art, even thickness is identical, under the power effect of identical dynamics, the amount of deformation at its each position also can be different, to adapt to the sealing needs that radial clearance is different, and intensity is enough, solved well the problem of crossing location.
Further, the utility model arranges shutoff ring in the first spool lower end, therefore, in the valve closing process, when the guide rod under the second spool and crown spherical surface body stretch in the valve seat fluid inlet, can play for the first time dam, hypotensive effect, when the lower end of the first spool shutoff ring stretches in valve seat, inlet area diminishes again, and flow descends again, the flow velocity of fluid reduces, and plays Second Interception, hypotensive effect.
Its locking nut is set to crown sphere; after in it enters fluid passage holes in company with shutoff ring; fluid is flushed to this sphere; produce scattering, can effectively avoid valve seat and sealing surface directly to be washed away, described crown sphere is middle mobile in the valve seat fluid passage; " damming " of " barrier lake " formula of formation; form " damming " effect, as shown in Figure 5, played well dam, the effect of step-down, buffering, protection.
Further, valve component adopts demountable structure, directly built-up welding is not on valve body for seat material, and valve body is made independent part, and the fitting seat of valve inner, seal ring, valve seat also all become independent part, greatly facilitate and manufacture processing, be conducive to improve precision, after assembling, can effectively transmit impacting force by fitting seat, be fitting seat press seal ring, seal ring compresses valve seat again.Assemble simply, convenient disassembly, as long as change key component in valve body, accomplish convenience, timely, reliable during maintenance.
The utility model according to damming, step-down, sealing, the order of sealing again, use the principle of " damming ", realized closing and opening of valve.
On sealing surface due to described the first spool lower surface and valve seat upper surface, on the sealing surface of the internal conical surface of the second spool outer conical surface and seal ring 4 all built-up welding cemented carbide is arranged, be applicable to the High Temperature High Pressure occasion and use.
Embodiment 2:
This secondary seal stop valve, for low-temp low-pressure soft seal stop valve, structure is identical with embodiment 1, and difference is that the sealing surface of spool, valve seat is the soft seal layer, the soft seal layer is rubber or teflon material etc., and seal form has the various ways such as O type circle.Because its valve seat is all nonmetal, easily distortion, amount of deformation is large, has overcome the problem of crossing location, is applicable to the low-temp low-pressure occasion and uses.
The experiment proved that, the hard sealed stop valve of the utility model embodiment 1 High Temperature High Pressure can meet JB/T3595-2002, the test requirements documents such as JB/T9092 standard, and relevant parameters is as follows:
These are only the preferred embodiment of model utility, not in order to limit model utility, any modification of doing within all spirit in model utility and principle, be equal to and replace and improvement etc., within all should being included in the protection domain of model utility.
Claims (10)
1. a secondary seal stop valve, comprise valve body (15), valve rod (7), spool (3) and valve component, it is characterized in that: described spool, valve component is arranged in valve body (15), import and export with valve body (15) fluid passage that UNICOM forms bottom in and top out, described valve component bottom is provided with primary sealing area, top is provided with secondary sealing area, described spool comprises coaxial fit, but first spool (3) of relative sliding and the second spool (5), described the first spool (3) coordinates the sealing of the formation first order with primary sealing area, described the second spool (5) coordinates the sealing of the formation second level with secondary sealing area, form closed Seal cage between described primary sealing area and secondary sealing area.
2. a kind of secondary seal stop valve according to claim 1 is characterized in that: the coaxial shrink-fit structure of described the first spool (3) and the second spool (5) is: described the second spool (5) lower end is provided with the guide rod (19) through described the first spool (3) center hole; The relative sliding of described the first spool (3) and the second spool (5) is controlled as meeting the second sealing prior to the first unseal by being sheathed on the outer elastomer stage clip (13) of guide rod (19), lags behind the requirement of the first seal closure.
3. a kind of secondary seal stop valve according to claim 2, it is characterized in that: described the second spool (5) is the curved surface sealing surface with the fitting surface of secondary sealing area, and described the first spool (3) is plane sealing face or curved surface sealing surface with the fitting surface of primary sealing area.
4. a kind of secondary seal stop valve according to claim 3 is characterized in that: described the first spool (3) has from primary sealing area and coaxially extends and be placed in the shutoff ring (20) outside guide rod (19) along guide rod (19); The length of described shutoff ring (20) and guide rod (19) meets the requirement that can stretch under the valve closing state in the entrance of described valve component fluid passage.
5. a kind of secondary seal stop valve according to claim 4, it is characterized in that: described shutoff ring (20) lower end is provided with and is placed in shutoff ring (20) and is sheathed on the outer locking nut (14) of guide rod (19), and described locking nut (14) lower end surface is the crown sphere that diameter is less than valve component fluid passage entrance internal diameter; The lower end surface of described guide rod (19) is sphere, between described the first spool (3) and guide rod (19) by flexible graphite packing B(17) realize radial seal.
6. a kind of secondary seal stop valve according to claim 1 and 2, it is characterized in that: described valve component is detachable the connection with valve body (15), described valve component is by fixing with the detachable fixing fitting seat of valve body (15) (6) pressure holding, described fitting seat (6) has the inner chamber be connected with the valve component Seal cage, the top of described fitting seat (6) is provided with valve rod fitting seat (6), described valve rod fitting seat (6) is provided with flexible graphite packing C(18) to realize the sealing of fitting seat (6) bore seal and valve rod (7), be provided with flexible graphite packing A (16) between described valve seat (2) and valve body (15) and realize radial seal.
7. a kind of secondary seal stop valve according to claim 6, it is characterized in that: described valve component is columnar structured, the inner chamber of described fitting seat (6) is cylindrical shape and is coaxial docking with the valve component Seal cage, described primary sealing area is the plane sealing face be arranged in valve component lower shaft tangent plane, the secondary sealing area of described valve component is the conical seal surface that is arranged at edge on valve component, on the sidewall of described fitting seat (6) cylindrical cavity, is provided with the fluid output be communicated with valve body (15); Described the second spool (5) is controlled in fitting seat (6) inner chamber and is slided by valve rod (7), and described the first spool (3) slides in the Seal cage of valve component, realizes that the unlatching of fluid passage is with closed.
8. a kind of secondary seal stop valve according to claim 6, it is characterized in that: described valve component comprises disc valve seat (2) and the cylindrical shape seal ring (4) of lower end pressure holding on described valve seat (2) embedded in valve body (15), described seal ring (4) upper end and fitting seat (6) lower end offset, and internal diameter approximately is less than the internal diameter of fitting seat (6) inner chamber so that upper-end surface forms internal conical surface, the outer surface of described the second spool (5) lower end is the outer conical surface coordinated with seal ring (4), the lower surface of the upper surface of described valve seat (2) and the first spool (3) forms the primary sealing area of plane sealing.
9. a kind of secondary seal stop valve according to claim 8, it is characterized in that: described secondary seal stop valve is the hard sealed stop valve of High Temperature High Pressure, and the equal built-up welding of internal conical surface of described the first spool (3) lower surface and valve seat (2) upper surface, the second spool (5) outer conical surface and seal ring (4) has the sealing layer of cemented carbide material.
10. a kind of secondary seal stop valve according to claim 2 is characterized in that: when the nominal diameter DN of described secondary seal stop valve is 10-100mm, and spring free length L
1for 0.65-0.8DN, spring compresses rear height L fully
2for 0.5-0.6DN, the height difference H of described primary sealing area and secondary sealing area
1for 1.2-1.5DN, the open amount H of spool
2for 3-3.5DN, when the nominal diameter DN of described secondary seal stop valve is 100-300mm, spring free length L
1for 0.8-1.0DN, spring compresses rear height L fully
2for 0.6-0.7DN, the height difference H of primary sealing area and secondary sealing area
1for 1.4-1.5DN, the open amount H of spool
2for 1.5-2.DN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201625612U CN203335872U (en) | 2012-09-21 | 2013-04-03 | Secondary sealing stop valve |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220486124 | 2012-09-21 | ||
| CN201220486124.1 | 2012-09-21 | ||
| CN2013201625612U CN203335872U (en) | 2012-09-21 | 2013-04-03 | Secondary sealing stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203335872U true CN203335872U (en) | 2013-12-11 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201625612U Expired - Lifetime CN203335872U (en) | 2012-09-21 | 2013-04-03 | Secondary sealing stop valve |
| CN201310114075.8A Active CN104006165B (en) | 2012-09-21 | 2013-04-03 | Secondary seal stop valve |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310114075.8A Active CN104006165B (en) | 2012-09-21 | 2013-04-03 | Secondary seal stop valve |
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| Country | Link |
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| CN (2) | CN203335872U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006165A (en) * | 2012-09-21 | 2014-08-27 | 张轶 | Two-stage seal stop valve |
| CN105257829A (en) * | 2015-10-15 | 2016-01-20 | 上海市计量测试技术研究院 | Ultrahigh-pressure stop valve |
| CN107269862A (en) * | 2016-04-06 | 2017-10-20 | 上海电站阀门厂有限公司 | One kind can change twin-core stop valve |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110094513B (en) * | 2018-01-31 | 2022-12-16 | 浙江三花商用制冷有限公司 | Electric valve |
| CN109838564B (en) * | 2019-03-28 | 2024-05-03 | 西峡龙成特种材料有限公司 | Double-seal high-temperature sealing valve and high-temperature combustible gas conveying system |
| CN114508594B (en) * | 2022-02-16 | 2024-05-31 | 一汽解放汽车有限公司 | Electromagnetic actuator and electromagnetic execution system |
| CN117231749B (en) * | 2023-11-10 | 2024-03-29 | 三峡金沙江云川水电开发有限公司 | Water filling valve for hydropower station gate |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69625344T2 (en) * | 1996-07-15 | 2003-09-18 | Toyo Stainless Steel Ind Co | Double seat valve |
| CN100529485C (en) * | 2004-07-29 | 2009-08-19 | 三浦工业株式会社 | Cutoff valve |
| CN201100418Y (en) * | 2007-09-18 | 2008-08-13 | 黄祥胜 | An erosion prevention cut-off valve |
| CN201568591U (en) * | 2009-12-30 | 2010-09-01 | 固安沃克流体控制有限公司 | Composite stop valve with double valve cores |
| CN203335872U (en) * | 2012-09-21 | 2013-12-11 | 张轶 | Secondary sealing stop valve |
-
2013
- 2013-04-03 CN CN2013201625612U patent/CN203335872U/en not_active Expired - Lifetime
- 2013-04-03 CN CN201310114075.8A patent/CN104006165B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006165A (en) * | 2012-09-21 | 2014-08-27 | 张轶 | Two-stage seal stop valve |
| CN104006165B (en) * | 2012-09-21 | 2016-05-11 | 张轶 | Secondary seal stop valve |
| CN105257829A (en) * | 2015-10-15 | 2016-01-20 | 上海市计量测试技术研究院 | Ultrahigh-pressure stop valve |
| CN107269862A (en) * | 2016-04-06 | 2017-10-20 | 上海电站阀门厂有限公司 | One kind can change twin-core stop valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104006165A (en) | 2014-08-27 |
| CN104006165B (en) | 2016-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131211 Effective date of abandoning: 20160511 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |