CN103968093B - Propped open type parallel dual-gate valve with deflector hole - Google Patents

Abstract

The invention discloses a propped open type parallel dual-gate valve with a deflector hole. The propped open type parallel dual-gate valve with the deflector hole is technically characterized in that a main gate disc and an auxiliary gate disc are attached to each other with a single inclined plane, and the main gate disc and the auxiliary gate disc are provided with slightly protruding circular bosses which are smaller than a sealing face in inner diameter to serve as the fitting faces of the main gate disc and the auxiliary gate disc respectively. Gate disc hooking T-shaped grooves which are hooked mutually through T-shaped structures are formed in the upper side and the lower side of the circular boss of the main gate disc and the circular boss of the auxiliary gate disc. The deflector hole is formed in the lower end of the main gate disc, and the deflector hole is aligned to a valve channel hole when the valve is opened. A limiting boss is arranged at the upper end of the auxiliary gate disc, and the lower side face of the limiting boss makes contact with the upper side limiting plane of an inlet valve seat when the valve is closed. A spring seat is arranged on the main gate disc, and spring force acts on the auxiliary gate disc in the direction of the inclined plate downwards. The valve has the advantages that the valve has low flow resistance characteristics, has good sealing performance and sealing reliability, and is long in service life, the phenomenon of sticking is not prone to occurring, the structure is simple and reasonable, opening and closing actions are reliable, and maintenance is convenient to carry out.

Description

Band pod apertures expansion type parallel double-gate-plate gate valve

Technical field

The present invention relates to a kind of valve mechanism is and in particular to a kind of structure of the parallel double-flashboard gate valve with pod apertures.

Background technology

In large-scale fluids process system, if the scale of system and larger, pipeline the cumulative length of capacity are longer, join The valve quantity of set is more, then when carrying out the type selecting of mating valve, except sealability and the sealed reliable of valve to be considered Property outside, simultaneously it should also be taken into account that selected valve should have alap flow resistance coefficient, to reduce the pressure loss, reduce energy Consumption.A set of Large-scale machine set or device need supporting plurality of valve, if not considering this point in terms of valve selection, The pressure of numerous valves and energy loss are accumulated in together, and will bring impact to the energy consumption of system and efficiency index.Therefore, from reason For upper, the restriction that the multiplication strains of valve brought discounting for existing valve products series, Large-scale machine set or Main technique pipeline in device and equipment especially operating mode medium are supporting on the process pipe of medium and high temperature medium and equipment Valve when carrying out type selecting, preferable valve should be: there is as ball valve low flow resistance characteristic well, as stop valve, Gate valve equally has good sealability and sealing reliability and high-temperature adaptability.

In large-scale thermal power machine group and large-scale petrochemical device, install and use substantial amounts of valve.Choosing for valve Type, needs according to requirements possible selection to be compared and weigh, although ball valve have low flow resistance, low pressure loss excellent Gesture, but due to being restricted by sealing member material and sealing structure, its sealability and sealing reliability and high-temperature adaptability, with Sealing surface is metallic sealing section, external force can be relied on to compare come the Wedge Gate Valves to increase sealing force, also there is larger gap；And Although Wedge Gate Valves sealing and heatproof two aspect can preferably meet use requirement, valve in opening, by valve The impact of inner flow passage form can make the medium turbulization of flowing and big vortex, produces flow resistance and the pressure loss, and main technique Flow resistance and crushing produced by substantial amounts of valve on pipeline and equipment, undoubtedly can increase the energy consumption of unit and device, reduce efficiency. At present, in existing valve products series, temporarily also it is difficult to find that at flow resistance and the aspect such as sealing, temperature tolerance and is making Valency, reliability and service life aspect can preferably meet using the product of needs can be used for select and supporting.Existing rank The bore that section is used on the main technique pipeline and equipment of large-scale thermal power machine group and large-scale petrochemical device is larger Valve typically with based on Wedge Gate Valves, especially medium and high temperature operating mode, then can only be carried out supporting from gate valve, such as big Capacity fired power generating unit includes, in the tubings such as the main feedwater of super (super-) critical unit, main steam, reheated steam, generally selecting at present It is used for supporting with pressure-tight high pressure Wedge Gate Valves.Although selecting Wedge Gate Valves in the sealing of valve and the aspect energy such as high temperature resistant Enough satisfactions use needs, but the flow resistance coefficient of valve and crushing are bigger than normal, are the problems that needs take in and solve.

There is the valve of low flow resistance characteristic, its closure member should be provided with diameter suitable with valve import and export flow diameter Water conservancy diversion pore structure.

The valve with above-mentioned requirements be closer to pod apertures and in sealing and the aspect such as high temperature resistant is bracing type double flat Plate gate valve.Bracing type gate valve with two flat plates (also known as expansion sluice valve, as shown in Figure 1 and Figure 2) is at present in api6d petroleum natural gas pipeline At most, an application in addition is geothermal vapour pipeline for upper application.If using the valve of this structure as large-scale thermal power Block valve on unit and the main process pipe of large-scale petrochemical device and equipment uses, and especially as Large-scale fire-electricity unit, master gives The high-temperature high pressure valve of the tubings such as water, main steam, reheated steam uses, and there are several shortcomings as follows: 1, flashboard assembly is , easily there is wedge dead phenomenon when worst hot case uses, lead to valve can not normally open and close in full rigidity structure；2nd, main gate-board and auxiliary gate-board The laminating size on inclined-plane and scope excessive, when the error because of angle or there is impurity clamping stagnation to lead to valve seal secondary on inclined-plane When identical property is not good enough, substantially uncompensated ability；3rd, the laminating inclined-plane of main gate-board and auxiliary gate-board is typically formed by bulk material processing, Anti-scuffing function is poor, although some producers also use nitriding, nickel plating or qpq process, the base because of strengthening layer thinner thickness Body material is excessively soft, anti scuffing destroy ability nor fully meet use requirement；Once laminating inclined-plane produces scratch, then rub Coefficient can sharply increase, and along with the product of some producers domestic and international is fitted, natively ratio is close through grind for the roughness on inclined-plane The roughness of front cover is low many, and when can lead to open, main gate-board is forced to drive auxiliary gate-board to rise together, causes import and export both sides Sealing pair open during exist all the time high specific pressure power friction so that produce sealing surface scratch, simultaneously valve open Open moment of torsion and also have larger increase；4th, flashboard assembly is double inclined surface structure, bulky, weight weight；5th, complex structure, zero Number of packages amount is many, reduces the dependability of product；6th, the less part of some sizes on flashboard assembly for example bearing pin, rocking arm, The driving members such as slide block, straight pin, when running into jam during valve opens and closes and needing to be operated with high-torque, in intensity and reliability Property aspect is it is possible that problem；7th, bearing pin, straight pin typically using interference fit press-in, be threaded into or spot welding by the way of solid Fixed, easily deviate from after by larger active force；8th, it is provided with pod apertures on main gate-board and auxiliary gate-board, flashboard assembly is opened simultaneously Open, after spreading, main gate-board pod apertures are difficult to ensure that to be verified completely with auxiliary gate-board pod apertures and valve passage hole, thus is also unfavorable for Reduce valve flow resistance to greatest extent；9th, supreme sealing surface on valve rod, is unfavorable for sealing and the maintenance at filler position；10th, bore Smaller bracing type gate valve with two flat plates typically to assist auxiliary gate-board to reset when opening using torsion spring, due to torsion spring force direction It is closer to Self-locking angle and the impact of laminating bevel friction power, sometimes do not ensure that auxiliary gate-board energy reliable reset.

In addition to Wedge Gate Valves, strut the parallel double-flashboard gate valve of two flashboards in Water of Power Plant and jet chimney by spring There is certain application, therefore Ye You producer Development and Production crosses the parallel double-flashboard gate valve with pod apertures.Although this valve solves Resistance coefficient problem, but also limit in place of the existing some shortcomings in structure and performance of existing parallel double-flashboard gate valve This product is further applied: 1, parallel double-flashboard gate valve relies primarily on the work to outlet side flashboard for the medium when using Exert oneself to realize to seal, and can not as Wedge Gate Valves, can rely on simultaneously additional wedging power come to improve sealing property and The sealing condition improving valve during certain leakage by increasing additional wedging power in valve；2nd, parallel double-flashboard gate valve is being opened When opening state, the sealing surface of flashboard and valve seat still has the laminating of certain area, in the disturbance of flow media and the impact of vibration Under, the position especially edge that sealing surface contacts with each other may produce and weigh wounded, once have weigh wounded after opening with valve Close, damage can expand to other positions of sealing surface so that sealing surface comparatively fast lost efficacy.

Content of the invention

In place of overcoming the above-mentioned some shortcomings existing for existing product, the present invention proposes one kind and has low flow resistance Characteristic, have that good sealability and sealing reliability, service life are more longlasting, be not susceptible to when high temperature operating mode uses The dead phenomenon of wedge, simple and reasonable, switching motion reliability, expansion type parallel double-gate-plate gate valve easy to maintenance.

To achieve these goals, the present invention employs the following technical solutions:

A kind of band pod apertures expansion type parallel double-gate-plate gate valve, including valve body, outlet valve seat, import valve seat, main gate-board, pair Flashboard, spring, spring base, clamp, valve gap, valve rod, outlet valve seat and import valve seat are welded on valve body, the sealing surface of two valve seats It is parallel to each other, main gate-board is located at valve outlet side.Its basic structure and major technique it is critical only that: main gate-board and auxiliary gate-board are with list Inclined-plane fits, main gate-board and auxiliary gate-board are respectively arranged with diameter be less than sealing surface of seat internal diameter, slightly protrude from around table The circular bosses in face, boss plane is the binding face of major and minor flashboard；The upper and lower sides being located at circular bosses in main gate-board and auxiliary gate-board set Be equipped with mutually hooked together with t shape slot structure, the main gate-board as horizontal direction for the bearing of trend hooks together t groove and auxiliary gate-board hooks together t groove, main switch Plate hook closes t groove and auxiliary gate-board and hooks together the groove inner face of t groove and leaves and can allow auxiliary gate-board along the incline direction of major and minor flashboard binding face The enough gaps moving up and down；The lower end of main gate-board is provided with pod apertures, when main gate-board moves to open position, pod apertures with Valve passage hole substantially aligns and leaves between the both ends of the surface of pod apertures and outlet valve seat sealing surface and import sealing surface of seat Little gap；The upper end of auxiliary gate-board is provided with positive stop lug boss, the plane on the downside of positive stop lug boss is displaced downwardly to close stance in auxiliary gate-board Plane --- the spacing plane contact of auxiliary gate-board when putting and on the upside of import valve seat.

In order to the function of this product being better achieved, improving the Performance And Reliability of product, the present invention also adds following Some further technical schemes:

Valve rod is connected with t shape groove connected mode with main gate-board, the upper end of main gate-board be provided with extend perpendicularly to close The t shape groove of front cover.

In the upper end position of auxiliary gate-board, positioned at positive stop lug boss both sides, two spring bases being fixed on main gate-board, bullet are set The main part of spring abutment --- counterbore directed downwardly is had on pedestal, in counterbore, places spring, counterbore is parallel with the axis direction of spring Direction in the laminating inclined-plane of main gate-board and auxiliary gate-board；Auxiliary gate-board be located at lower spring end corresponding position be machined with perpendicular to The plane in axle of spring direction --- spring force pressure-bearing surface, this plane the side perpendicular to main gate-board, the laminating inclined-plane of auxiliary gate-board To.

Above-mentioned spring base is in the fixation on main gate-board in the following way: has two on main gate-board perpendicular to sealing The rectangular through holes in face direction, the right-hand member of spring base is to may be inserted into rectangular through holes, length the side more than rectangular through holes Body, spring base is located at the longitudinal cross-section scope of the pedestal part of square body left end more than the section of square body, stretches in the square body of spring base The part going out rectangular through holes right-hand member vertically has stopper slot；The bottom of the t shape groove of main gate-board is provided with clamp fixed Position groove, the width of t-shaped, platy structure its plate body part of clamp is suitable with the width of the clamp locating slot on main gate-board and pacifies It is loaded in clamp locating slot, the position setting of the stopper slot that the end of clamp right-hand member ledge is located on spring base at it is limited Position flange, when clamp is installed, defining flange can snap in stopper slot, and after valve assembling, the lower surface of valve rod is located at the upper of clamp Side.

The circular bosses on circular bosses and auxiliary gate-board on main gate-board be using wear-resistant, anti scuffing hard material built-up welding and The overlaying surface being formed after processing.

Certain limit within the sealing surface side of the sealing surface side of main gate-board and auxiliary gate-board, sealing surface internal diameter, is all provided with Put the recessed structure removing certain material, the bottom surface of recessed portion is ramped bottom surface the inclined-plane of fitting with main gate-board, auxiliary gate-board Incline direction consistent.

The connection of valve body and valve gap and sealing structure are adopted and with stud, nut, flange in body, lid and sealing member are carried out tightly Solid bolt attachment structure.

Guide frame that main gate-board moves up and down in valve body adopts: arranges in setting guiding rib on main gate-board, valve body and leads To groove.

Position setting anti-rotation guide frame outside valve rod is located at valve body cavity, described anti-rotation guide frame includes solid It is scheduled on the guide plate on valve rod, the column on the upside of valve gap, guide plate can slide up and down along column.

Adopt at the plane on the downside of the positive stop lug boss of the spacing plane of auxiliary gate-board on the upside of inlet valve seat and/or auxiliary gate-board Form overlaying surface with after wear-resistant, anti scuffing hard material built-up welding and processing.

In the upper side and lower side of the convex shoulder of valve stem nut, disk spring is set.

The bottom of body cavity is set to semispherical surface.The basic configuration of the outer surface at this position is also hemispherical simultaneously Surface.

The invention has the beneficial effects as follows: valve have low flow resistance characteristic, the crushing that can effectively reduce unit and system and Energy consumption, has good sealability and sealing reliability, and service life is more longlasting, is not susceptible to when high temperature operating mode uses The dead phenomenon of wedge, simple and reasonable, switching motion is reliable, easy to maintenance.

Brief description

It is the schematic diagram of two kinds of typical structures of existing bracing type gate valve with two flat plates shown in Fig. 1 and Fig. 2.

Fig. 3 is that the structure of an embodiment with pod apertures expansion type parallel double-gate-plate gate valve proposed by the invention is shown It is intended to.

Fig. 4 is that the partial enlargement at the flashboard assembly position of an embodiment of valve mechanism proposed by the invention is illustrated Figure.

Fig. 5 is the main switch plate structure schematic diagram of embodiment.

Fig. 6 is the auxiliary gate-board structural representation of embodiment.

Fig. 7 is the schematic diagram of fixed form on main gate-board for the spring base.

Fig. 8 is the schematic diagram of the valve body gathering sill of embodiment.

In figure, 1, valve body, the spacing plane of 1-1, auxiliary gate-board, 1-2, gathering sill；2nd, outlet valve seat, 2-1, sealing surface；3rd, enter Mouth valve seat, 3-1, sealing surface；4th, main gate-board, 4-1, sealing surface, 4-2, pod apertures, 4-3, t shape groove, 4-4, circular bosses, 4-5, master Flashboard hooks together t groove, 4-6, rectangular through holes, 4-7, clamp locating slot, 4-8, guiding rib；5th, auxiliary gate-board, 5-1, sealing surface, 5-2, Positive stop lug boss, 5-3, circular bosses, 5-4, auxiliary gate-board hook together t groove, 5-5, spring force pressure-bearing surface；6th, spring；7th, spring base, 7-1, seat Body, 7-2, square body, 7-3, stopper slot；8th, clamp, 8-1, plate body part, 8-2, defining flange；9th, valve gap；10th, valve rod；11st, lead To plate；12nd, column；13rd, valve stem nut；14th, disk spring.

Specific embodiment

With reference to the accompanying drawings and examples technical scheme is further elaborated.

Valve as designed by Fig. 3 is that the structure of 1000mw extra-supercritical unit water supply system heat pump outlet electric gate valve is shown It is intended to.Design pressure/the temperature of valve is 40.92mpa/302.4 DEG C, latus rectum dn400, the material of valve body, valve gap and major-minor flashboard Expect for wb36 steel, valve body is to process after solid forging.

As shown in Fig. 3～Fig. 6, it is the concrete structure schematic diagram of valve, its major part includes valve body (1), outlet valve seat (2), import valve seat (3), main gate-board (4), auxiliary gate-board (5), spring (6), spring base (7), clamp (8), valve gap (9), valve rod (10) etc., outlet valve seat (2) and import valve seat (3) are welded on valve body (1), after the completion of welding weld seam together with valve internal channel on Lathe with nothing left one time it is ensured that passage have minimum flow resistance；The sealing surface of two valve seats is parallel to each other, and main gate-board (4) is located at valve body Outlet side.The basic technical scheme of this valve and major technique it is critical only that: main gate-board (4) and auxiliary gate-board (5) are with monocline face phase Laminating, is respectively arranged with the 50%-60% of a diameter of sealing surface of seat internal diameter on main gate-board (4) and auxiliary gate-board (5), slightly protrudes In circular bosses (4-4) and the circular bosses (5-3) of circumferential surface, boss plane is the binding face of major and minor flashboard；In main gate-board (4) and auxiliary gate-board (5) be located at circular bosses upper and lower sides be provided with mutually hooked together with t shape slot structure, bearing of trend is as horizontal direction Main gate-board hook together t groove (4-5) and auxiliary gate-board hooks together t groove (5-4), main gate-board hooks together t groove (4-5) and auxiliary gate-board hooks together t groove (5- 4) groove inner face leaves and can allow auxiliary gate-board (5) along enough gaps of the incline direction up and down motion of major and minor flashboard binding face； The lower end of main gate-board (4) is provided with pod apertures (4-2), when main gate-board (4) moves to open position, pod apertures (4-2) and valve Door hole substantially aligns and the both ends of the surface of pod apertures (4-2) and outlet valve seat sealing surface (2-1) and import sealing surface of seat (3-1) leave little gap between；The upper end of auxiliary gate-board (5) is provided with positive stop lug boss (5-2), on the downside of positive stop lug boss (5-2) Plane when auxiliary gate-board (5) is displaced downwardly to closed position with import valve seat (3) on the upside of plane --- auxiliary gate-board spacing plane (1- 1) contact.

During valve closing, on the upside of plane on the downside of the positive stop lug boss (5-2) on auxiliary gate-board (5) and import valve seat (3) During the spacing plane of auxiliary gate-board (1-1) contact, auxiliary gate-board (5) just stops moving down and main gate-board (4) continues to decline, and main gate-board (4) leads to Cross two circular bosses (4-4) and the effect on (5-3) inclined-plane promotes the sealing surface (5-1) of auxiliary gate-board (5) to be affixed to the close of import valve seat (3) Front cover (3-1) is simultaneously adjacent to, meanwhile, main gate-board (4) also sealing surface with outlet valve seat (2) under wedging power and pressure medium effect (2-1) it is adjacent to and reach sealing state；Flashboard by split pattern the major and minor flashboard structure master that two circular bosses are constituted simultaneously, The diameter of the contact surface of the auxiliary gate-board less 50%-60% of sealing surface of seat internal diameter (only), this will be helpful to process in the angle of wedge Certain compensating thus being conducive to the sealing of valve can be produced during the identical property having micro error impact sealing pair.Major and minor lock On plate, the inside and outside opposite of setting hooks together t groove, and can constrain auxiliary gate-board (5) can only be along tiltedly in the state of pressing close to main gate-board (4) Face direction moves up and down, and when auxiliary gate-board (5) moves down with respect to main gate-board (4), the shelves of opening of flashboard assembly zoom in, can be at two Smoothly move between the sealing surface of valve seat.After valve opening, the pod apertures (4-2) of main gate-board (4) and valve body, valve base channel hole pair Just, constitute and there is to media flow relatively low flow resistance and the pressure loss, the preferable runner as direct piping.

Additionally, the present embodiment also has some other to be intended to be better achieved the function of this product, improve product simultaneously The additional further technical scheme of Performance And Reliability, these specific technical schemes and its effect or action principle are as follows State:

Valve rod (10) is connected with t shape groove connected mode with main gate-board (4), and the upper end of main gate-board (4) is provided with extension side To t shape groove (4-3) perpendicular to sealing surface.Compared with by the way of threaded, t shape groove connected mode avoids in flashboard The uneven stress of the valve rod being brought by inevitable foozle after closing or even elasticity or plastic bending deformation.

Upper end position in auxiliary gate-board (5), positive stop lug boss (5-2) both sides are provided with two it are fixed on main gate-board (4) On spring base (7), the main part of spring base (7) --- have counterbore directed downwardly on pedestal (7-1), place spring in counterbore (6), the axis direction of counterbore and spring (6) is parallel to the direction on the laminating inclined-plane of main gate-board (4) and auxiliary gate-board (5)；In secondary lock Plate (5) be located at spring (6) lower end corresponding position be machined with perpendicular to spring (6) axis direction plane --- spring force holds Pressure surface (5-5), this plane the direction perpendicular to main gate-board (4), the laminating inclined-plane of auxiliary gate-board (5).Described spring base (7) exists Fixed form on main gate-board (4) is: has two rectangular through holes (4- perpendicular to sealing surface direction on main gate-board (4) 6) (referring to Fig. 5 and Fig. 7), the right-hand member of spring base (7) is to may be inserted into rectangular through holes (4-6), length and lead to more than rectangle The square body (7-2) in hole (4-6), the longitudinal cross-section scope that spring base (7) is located at pedestal (7-1) part of square body (7-2) left end is big The section of Yu Fangshen (7-2), stretches out the part of rectangular through holes (4-6) right-hand member along Vertical Square in the square body (7-2) of spring base (7) To having stopper slot (7-3)；The bottom of t shape groove (4-3) of main gate-board (4) is provided with clamp locating slot (4-7), t-shaped, plate The width of its plate body part (8-1) of clamp (8) of shape structure is suitable with the width of the clamp locating slot (4-7) on main gate-board (4) And be installed in clamp locating slot (4-7), the end of clamp (8) right-hand member ledge is spacing on it is positioned at spring base (7) The position of groove (7-3) is provided with defining flange (8-2), and when clamp (8) is installed, defining flange (8-2) can snap in stopper slot (7- 3), in, after valve assembling, the lower surface of valve rod (10) is located at the upside of clamp (8).

Spring (6) is that during valve opening, auxiliary gate-board (5) is at this along bevel direction downwards to the thrust direction of auxiliary gate-board (5) Hooking together under the constraint of t groove (4-5) and (5-4) of thrust and major and minor flashboard, moves down along bevel direction and is maintained at lowest order Put, so that the shelves of opening of flashboard assembly is drawn in as minimum, so that can be between two sealing surface of seats in closing and opening process Smoothly move.Valve, in assembling, can be blocked through rectangular through holes (4-6) by the defining flange (8-2) on clamp (8) Spring base (7) guarantee that it does not fall out, valve rod (10) withstands clamp (8) after loading, and that clamp (8) can be made to be maintained at is set again Position will not shift.Spring base (7) is fixed using this fixed form, and structure is simply reliable, and assembling, maintenance are all very square Just.

The circular bosses (5-3) on circular bosses (4-4) and auxiliary gate-board (5) on main gate-board (4) are using wear-resistant, anti-wiping The overlaying surface being formed after hindering hard material built-up welding and processing.Its master of many products of existing expansion type parallel double-gate-plate gate valve, The laminating inclined-plane of auxiliary gate-board generally individually processes using by bulk material, and anti-scuffing function is poor, after surface oxidation corrosion simultaneously Also coefficient of friction can be greatly increased makes the switching motion of valve become unreliable；Although some producers also take simple surface Protective treatment but because strengthening layer thinner thickness, matrix material are excessively soft, anti scuffing destroy ability actually nor fully meet Require；If laminating inclined-plane produces scratch, the switching motion making valve is gone wrong, or even make sealing surface produce scratch, valve Door is opened moment of torsion and is also had larger increase.Therefore, the present invention carries out heap postwelding reprocessing circle at major and minor flashboard laminating inclined-plane Boss, one is antirust, and two is to improve wear-resistant, antifraying property.

Sealing surface (5-1) side of sealing surface (4-1) side of main gate-board (4) and auxiliary gate-board (5), sealing surface internal diameter with Interior certain limit, is provided with the recessed structure removing certain material, the bottom surface of recessed portion is ramped bottom surface and main gate-board (4), the incline direction on the laminating inclined-plane of auxiliary gate-board (5) is consistent.Main gate-board (4) and auxiliary gate-board (5) both sides are designed as recessed work With, in addition to removing unnecessary material and mitigating weight, main purpose is in order to appropriateness reduces the rigidity of flashboard, in sealing surface Micro elastic compensating can be had to act on when identical property is slightly worse, act on and reduce two flashboards laminatings by this elastic compensating tiltedly The contact range in face and area, employ the comprehensive function of double disc this three of structure, can preferably improve sealing during closing Secondary identical state, improves the sealing of valve.

The connection of valve body (1) and valve gap (9) and sealing structure are with stud, nut, flange in body, lid and sealing member to be entered The bolt attachment structure of row fastening.Why body, the connection of lid and sealing do not adopt pressure sealing structure to connect using bolt Structure, its purpose has the axial location that two: is its valve gap of pressure sealing structure to be in quick condition it is difficult to ensure that valve rod is opened Open the proper alignment of rear flashboard pod apertures and valve passage hole, and bolt attachment structure and then there is not this problem；Two be due to Sealing reliability using the pressure sealing structure of stress metal sealing ring is not relatively good enough --- abroad as velan valve company In high pressure valve product, flange is mainly namely based on this reason using bolt attachment structure, can during attachment structure using bolting With at metal o-ring using multi-sealing structure so that body, lid junction have excellent sealing property.Using bolt Attachment structure also reduces valve body middle chamber height and valve whole height simultaneously, simplifies valve mechanism, and is also more convenient dimension Repair.

The guide frame that main gate-board (4) moves up and down in valve body (1) is: main gate-board (4) upper setting guiding rib (4-8), Setting gathering sill (1-2) (referring to Fig. 5 and Fig. 8) in valve body (1).On flashboard setting guiding rib and on valve body setting gathering sill be for Reduce the size of guide frame on flashboard, facilitate the structure design of flashboard, reduce overall dimensions and the weight of flashboard.

Position setting anti-rotation guide frame outside valve rod (10) is located at valve body cavity, described anti-rotation guide frame bag Include the guide plate (11) being fixed on valve rod (10), the column (12) on the upside of valve gap (9), guide plate (11) can be along column (12) slide up and down.Valve rod upper end arranges anti-rotation guide frame, and flashboard assembly can be avoided to be subject to valve rod to pass through t shape when closed The torsion that groove location applies produces interference and shadow noon it is ensured that valve reliably working to closing motion.

Positive stop lug boss (5- in the spacing plane of the auxiliary gate-board (1-1) on the upside of inlet valve seat (3) and/or auxiliary gate-board (5) 2) form overlaying surface after adopting wear-resistant, anti scuffing hard material built-up welding and processing at the plane on the downside of.This two planes are being closed Exist when closing and relatively slide, for more important valve, contact surface is wear-resistant, scratch-resistant hard surface will be favourable In the reliability improving valve closing action.

In the upper side and lower side of the convex shoulder of valve stem nut (13), disk spring (14) is set.Valve stem nut convex shoulder upper, Downside is respectively provided with disk spring, and its effect is in order to avoid in valve closing and unlatching, because valve rod is because of the change of temperature And expansion or shrinkage, lead to flashboard wedge extremely or valve rod is dead with sealing surface wedge on valve gap.The upper sealing surface of valve rod and valve gap therefore and After the dead phenomenon of wedge will not be produced, relievedly upper sealing surface can be opened foot, wedging during valve opening, except valve packing can be improved Outside the sealing reliability at letter position, protection filler, it is also beneficial to make the pod apertures of main gate-board and valve passage hole proper alignment.

The bottom of the inner chamber of valve body (1) is processed as semispherical surface.The basic configuration of the outer surface at this position is also simultaneously Semispherical surface.Compared with during current forging body cavity bottom processing how using flat pattern, pressure pocket end is hemisphere Shape surface makes the stress in high pressure operating mode for the valve body more reasonable, and stress distribution is uniform, thus security reliability is higher, weight simultaneously Lighter, profile is more attractive.

Above in association with an embodiment and corresponding accompanying drawing, the specific embodiment of the present invention is described, but these Explanation can not be considered as limiting the scope of the present invention.Those skilled in the art should know, the present invention is not subject to State the restriction of embodiment, its protection domain is defined by appending claims, any without departing from the claims in the present invention Book defined in the range of various changes, the technical scheme that formed of modification, all spirit without departing from the present invention and technology Essence, still can belong within scope of the presently claimed invention.

Claims (12)

1. a kind of band pod apertures expansion type parallel double-gate-plate gate valve, including valve body (1), outlet valve seat (2), import valve seat (3), master Flashboard (4), auxiliary gate-board (5), spring (6), spring base (7), clamp (8), valve gap (9), valve rod (10), outlet valve seat (2) and entering Mouth valve seat (3) is welded on valve body (1), and the sealing surface of two valve seats is parallel to each other, and main gate-board (4) is located at valve body (1) outlet side, its It is characterised by: main gate-board (4) is fitted with monocline face with auxiliary gate-board (5), main gate-board (4) and auxiliary gate-board (5) are respectively provided with Diameter is had to be less than sealing surface of seat internal diameter, the circular bosses (4-4) and the auxiliary gate-board that slightly protrude from the main gate-board (4) of circumferential surface (5) circular bosses (5-3) on, based on two circular bosses planes, the binding face of auxiliary gate-board；In main gate-board (4) positioned at main gate-board (4) the upper side and lower side of circular bosses (4-4) on, the upside of the circular bosses (5-3) on auxiliary gate-board (5) of auxiliary gate-board (5) And downside, be provided with mutually hooked together with t shape slot structure, the main gate-board as horizontal direction for the bearing of trend hooks together t groove (4-5) and secondary lock Plate hook closes t groove (5-4), and main gate-board hooks together t groove (4-5) and auxiliary gate-board hooks together the groove inner face of t groove (5-4) and leaves and can allow secondary lock Plate (5) is along enough gaps of the incline direction up and down motion of major and minor flashboard binding face；It is provided with the lower end of main gate-board (4) and lead Discharge orifice (4-2), when main gate-board (4) moves to open position, pod apertures (4-2) and valve passage hole align and pod apertures substantially (4-2) leave little gap between both ends of the surface and outlet valve seat sealing surface (2-1) and import sealing surface of seat (3-1)；In pair The upper end of flashboard (5) is provided with positive stop lug boss (5-2), and the plane on the downside of positive stop lug boss (5-2) is displaced downwardly to closing in auxiliary gate-board (5) With the plane on the upside of import valve seat (3) --- the spacing plane of auxiliary gate-board (1-1) contacts during position.

2. band pod apertures expansion type parallel double-gate-plate gate valve according to claim 1 it is characterised in that: valve rod (10) with main Flashboard (4) with t shape groove connected mode connect, the upper end of main gate-board (4) be provided with extend perpendicularly to outlet valve seat (2) and T shape groove (4-3) of the sealing surface of import valve seat (3).

3. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: in auxiliary gate-board (5) Upper end position, be provided with two spring bases (7) being fixed on main gate-board (4), spring base positioned at positive stop lug boss (5-2) both sides (7) have counterbore directed downwardly on main part --- pedestal (7-1), in counterbore, place spring (6), the axle of counterbore and spring (6) Line is oriented parallel to the direction on the laminating inclined-plane of main gate-board (4) and auxiliary gate-board (5)；It is located at spring (6) lower end in auxiliary gate-board (5) Corresponding position is machined with the plane perpendicular to spring (6) axis direction --- spring force pressure-bearing surface (5-5), and this plane is vertical The straight direction in main gate-board (4), the laminating inclined-plane of auxiliary gate-board (5).

4. according to claim 3 with pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: described spring base (7) in the fixed form on main gate-board (4) it is: have two on main gate-board (4) perpendicular to outlet valve seat (2) and import valve seat (3) rectangular through holes (4-6) in sealing surface direction, the right-hand member of spring base (7) is insertion rectangular through holes (4-6) and length More than the square body (7-2) of rectangular through holes (4-6), spring base (7) is located at pedestal (7-1) part of square body (7-2) left end to degree Outside the section of at least one side side of protruding from body (7-2) in longitudinal cross-section, stretch out length in the square body (7-2) of spring base (7) The part of square through hole (4-6) right-hand member vertically has stopper slot (7-3)；Bottom in t shape groove (4-3) of main gate-board (4) Portion is provided with clamp locating slot (4-7), the width of t-shaped, platy structure its plate body part (8-1) of clamp (8) and main gate-board (4) width of the clamp locating slot (4-7) on quite and is installed in clamp locating slot (4-7), clamp (8) right-hand member ledge The position of stopper slot (7-3) that is located on spring base (7) at it of end be provided with defining flange (8-2), when clamp (8) is installed Defining flange (8-2) snaps in stopper slot (7-3), and after valve assembling, the lower surface of valve rod (10) is located at the upside of clamp (8).

5. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: on main gate-board (4) Circular bosses (4-4) and auxiliary gate-board (5) on circular bosses (5-3) be using wear-resistant, anti scuffing hard material built-up welding and plus The overlaying surface being formed after work.

6. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: in main gate-board (4) Sealing surface (4-1) side and sealing surface (5-1) side of auxiliary gate-board (5), the internal diameter of two sealing surfaces within certain limit, Be provided with the recessed structure removing certain material, the bottom surface of recessed structure be ramped bottom surface and with main gate-board (4), auxiliary gate-board (5) incline direction on laminating inclined-plane is consistent.

7. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: valve body (1) and valve The connection of lid (9) and sealing structure are that bolt flange in body, lid and sealing member being fastened with stud, nut connects knot Structure.

8. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: main gate-board (4) exists The guide frame moving up and down in valve body (1) is: main gate-board (4) is upper to arrange guiding rib (4-8), valve body (1) interior setting gathering sill (1-2).

9. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: in valve rod (10) position Position setting anti-rotation guide frame outside valve body cavity, described anti-rotation guide frame includes being fixed on valve rod (10) Guide plate (11), the column (12) on the upside of valve gap (9), guide plate (11) can slide up and down along column (12).

10. according to claim 1 band pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: positioned at import Adopt at plane on the downside of the positive stop lug boss (5-2) of the spacing plane of the auxiliary gate-board (1-1) on the upside of valve seat (3) and/or auxiliary gate-board (5) Form overlaying surface after wear-resistant, anti scuffing hard material built-up welding and processing.

11. according to claim 9 band pod apertures expansion type parallel double-gate-plate gate valves it is characterised in that: positioned at valve gap (9) With the top position of column (12), the valve stem nut (13) that is installed on valve rod (10) top, the upper side and lower side of its convex shoulder, setting There is disk spring (14).

12. according to claim 1 with pod apertures expansion type parallel double-gate-plate gate valve it is characterised in that: valve body (1) interior The bottom in chamber is semispherical surface, and the basic configuration of the outer surface at this position is also semispherical surface simultaneously.