CN109826970B - Hidden rod flat valve without flange and bolt connection valve cover structure - Google Patents
Hidden rod flat valve without flange and bolt connection valve cover structure Download PDFInfo
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- CN109826970B CN109826970B CN201910232363.0A CN201910232363A CN109826970B CN 109826970 B CN109826970 B CN 109826970B CN 201910232363 A CN201910232363 A CN 201910232363A CN 109826970 B CN109826970 B CN 109826970B
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- 238000007789 sealing Methods 0.000 claims abstract description 102
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 210000004907 gland Anatomy 0.000 claims description 17
- 229920001971 elastomer Polymers 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 230000000712 assembly Effects 0.000 abstract description 3
- 238000000429 assembly Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Details Of Valves (AREA)
Abstract
The invention discloses a blind rod flat valve without a flange and a bolt connection valve cover structure, which comprises a valve body, a flashboard and a driving device, wherein an inflow channel and an outflow channel are arranged on the valve body, a valve cavity is arranged between the inflow channel and the outflow channel, the flashboard is arranged in the valve cavity, valve seat assemblies are arranged at the flashboard near the inflow channel end and the outflow channel end, and the blind rod flat valve is characterized in that the valve body is formed into a complete closed valve cavity by a lower valve body and a valve cover matched with the lower valve body, the self-tightening sealing device (4) is of a lip-shaped structure, the cross section of the self-tightening sealing device is of an inverted U-shaped structure, the self-tightening sealing device is formed by superposing and combining a sealing outer ring (41) and a sealing inner ring (42), guide plates (8) are respectively arranged at two sides of an up-down movement position of the flashboard (9), and a plurality of reinforcing ribs (105) which are horizontally distributed are arranged in the lower valve body (111), and the blind rod flat valve has the advantages of good sealing performance.
Description
Technical Field
The invention relates to the field of valves, belongs to a fluid control universal mechanical product, and is widely applied to pipeline fluid transportation and control in petroleum, chemical industry, natural gas and other industries; in particular to a hidden rod flat valve without a flange and a bolt connection valve cover structure.
Background
The gate valve is classified according to the structural type of the gate plate, and is mainly divided into two main types of wedge gate plates and parallel gate plates at present, namely wedge gate valves and parallel gate valves (called flat valve for short), and the existing scheme similar to the invention is mainly composed of a valve body, a valve cover, a valve seat assembly, parallel gate plates (with or without diversion holes), a valve rod and gate plate connecting piece (the rising stem), a valve rod and valve cover sealing filler assembly, a valve cover bracket (the rising stem), a valve rod nut, a switch hand wheel or a valve operator, a valve body valve cover connecting bolt and the like. The valve body and the valve cover are formed by casting, the valve body is cylindrical or flat cylindrical and is provided with a valve diameter connecting pipe and a connecting flange, the upper part of the valve body is provided with a connecting flange and a valve cover flange which are connected through bolts to form a closed valve cavity for accommodating internal parts such as a flashboard, valve seat components and the like, the valve seat components are arranged at the inner ends of two connecting pipes of a valve cavity, the flashboard is arranged between the two valve seat components, guide rails are cast on two sides of a middle cavity of a valve cavity in the valve cavity so as to control the deflection of the movement process of the flashboard, a rising stem valve rod is connected with the flashboard through a connecting piece, a hidden stem valve rod is connected with the valve rod through a valve rod nut, the valve rod penetrates through the valve cover, a sealing filler is filled between the valve cover and the valve rod to ensure the valve rod to seal, a pair of valve seat components are oppositely clamped and attached to the flashboard under the action of a group of spring force, a valve cover bracket (rising stem) is arranged on the valve cover, a valve rod nut is filled at the upper part of the bracket, a trapezoid thread section of the upper part of the valve rod is screwed into the valve rod nut (rising stem), a hand wheel or a valve driver is sleeved into the valve rod nut to drive the valve rod to rotate anticlockwise or clockwise so that the valve rod is driven to drive the valve rod to be screwed up to move upwards (left-handed threads) to open the valve, or downwards to close the valve; the open-close movement of the open-stem flat valve is that the valve stem nut rotates to drive the valve stem to move up and down with the flashboard, the valve stem does not rotate, the open-close position of the valve can be seen through the open-close position of the valve stem which leaks outwards, the open-close movement of the hidden-stem flat valve is that the valve stem rotates to drive the valve stem nut in the valve cavity to move up and down with the flashboard, the valve stem nut does not rotate, and the flashboard open-close position of the valve cannot be seen outside the valve.
The structure is complex, the upper part of the middle cavity of the valve body is provided with a flange plate, the valve cover is also of a half cavity structure with the flange plate, the valve body is connected with the valve cover by a plurality of sets of bolt nuts to connect the flange on the middle cavity of the valve body with the flange of the valve cover in a pressing way, the sealing between the flanges is realized by the forced force of bolts, and when the bolts are not uniformly pre-tightened or loosened one by one, leakage can occur between the flanges; (2) the upper flange of the middle cavity of the valve body is connected with the flange of the valve cover in a plane butt clamp manner, a matched positioning spigot is not arranged between the two flanges, the positions of the upper bolt holes and the lower bolt holes are aligned during assembly, the dimensional deviation is large, the intersection of the axis of the valve rod and the axis of the valve body pipeline, namely the diameter of the valve seat assembly, cannot be ensured after assembly, and the centering of the flashboard and the eccentric wear of the valve rod are influenced by the offset; (3) limiting guide slide ways on two sides of the flashboard are cast integrally with the valve body in the up-and-down opening and closing movement process of the flashboard in the valve body, and because the cast guide rails cannot be machined and have uncontrollable casting dimensional tolerance, the gap size between the side of the flashboard and the slide way is larger than the dimensional tolerance range allowed by connection and matching between a valve rod and the flashboard, and when the guide rails on one side are deviated in the up-and-down movement process of the flashboard, the valve rod is inclined, sealing filler is eccentrically worn and leakage is generated; (4) the limit of the flashboard descending closing valve is that a T-shaped block connected with the flashboard by a valve rod touches the outer circle upper edge of the valve seat mounting aperture channel, and the size is uncontrollable because the part is a casting rough surface and cannot be machined, so that the switch limit of the valve is inaccurate, and particularly, the electric operator cannot uniformly adjust the limit position; (5) the prior hidden-rod flat valve is generally provided with no switch position indicator, and the switch position state of the valve cannot be identified from the appearance.
Disclosure of Invention
The invention aims to provide a blind rod flat valve without a flange and a bolt connection valve cover structure, which solves the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the blind rod flat valve is characterized in that the valve body is formed by a lower valve body and a valve cover matched with the lower valve body in a complete airtight valve cavity, an upper opening connected with the lower valve body is of a horizontal U-shaped lip structure, the lower valve body is of a rectangular cylinder shape, a lip opening, a gland contact table and a boss positioning stop opening are arranged at the top of the lower valve body, the gland contact table is positioned at the center of the lip opening, and the boss positioning stop opening is positioned at the center of the top surface of the gland contact table; the valve cover is arranged in the lip-shaped opening, the outer edge size of the valve cover is larger than the inner opening size of the lip-shaped opening, the upper end surface of the outer edge of the valve cover is contacted with the inner bottom plane of the lip-shaped opening, a sealing ring is arranged at the contact position of the upper end surface and the inner bottom plane of the lip-shaped opening, and the center of the valve cover is provided with a concentric counter bore formed by a positioning disc positioning groove and a valve rod hole; the positioning disc is arranged on the gland contact table through a set screw, an end face positioning boss is arranged at the bottom of the positioning disc, an indicator sleeve positioning boss is arranged at the upper part of the positioning disc, a positioning disc valve rod hole and a bearing groove are arranged at the center of the positioning disc to form a concentric counter bore structure, the end face positioning boss is matched and positioned with a boss positioning spigot at the upper part of a lip of a lower valve body, the end face positioning boss is arranged in a positioning groove at the center of the valve cover, an outer sealing ring is arranged on the matched side face of the end face positioning boss and the positioning groove, a self-tightening sealing device is arranged at the end face position, the positioning disc and the valve cover are simultaneously fastened and fixed through the set screw, the end face positioning boss at the bottom of the positioning disc is inserted into the positioning groove at the center of the valve cover to be concentrically matched with the positioning groove, and the set screw is screwed, the upper end face of the outer edge of the valve cover is completely contacted with the inner bottom plane of the lip, and the valve body and the valve cover form a complete closed valve cavity.
According to the technical scheme, the upper opening of the valve body connected with the valve cover is of a horizontal U-shaped lip structure, the valve cover is of an oblong shape, when the valve cover is assembled, the projection size of the inclined side of the valve cover is shortened and is narrowed to be smaller than the size of the long and short shafts of the inner opening of the valve body lip so as to be assembled into the lip opening of the valve body, when the valve cover integrally enters the inner cavity of the lip opening of the valve body and is then laid flat, a valve cover sealing ring and a lip-shaped self-tightening sealing ring are assembled in the outer edge sealing groove of the valve cover and the valve rod mounting hole, the positioning disc is assembled into an inner hole positioning spigot of the convex circle at the upper part of the lip of the valve body and is matched with a positioning disc end face positioning boss, an O-shaped ring is assembled into a concentric inner small hole and a bottom convex circle hole of the positioning disc, the positioning disc is screwed in, the positioning disc is fastened by a hexagonal fastening screw, the valve cover is horizontally pulled up, the bottom convex circle of the positioning disc is inserted into the valve rod mounting hole at the center of the valve cover to be concentrically matched with the valve body lip opening, and the plane at the outer edge of the valve cover is completely contacted with the inner plane of the lip opening of the valve body, and the valve cover is completely contracted, and the sealing ring in the sealing groove is completely in a pre-tightly pressed state, and the valve cover is formed by the valve cover; the technical scheme of the oblong flangeless and bolt-connected valve cover structure is that the oblong flangeless and bolt-connected valve cover structure is combined with a horizontal U-shaped lip-shaped opening of a flangeless upper end of a valve body matched with the oblong flangeless and bolt-connected valve cover structure in the invention through the mode, so that the joint sealing force between a valve cover and the valve body is not completed by the prior bolt external force, when the valve cover is assembled, the upper end plane of the outer edge of the valve cover is fully contacted with the inner plane of the lip-shaped opening of the valve body by a pre-tightening screw, the sealing ring in the sealing groove of the valve cover is in a pre-tightening state, so that the sealing ring has initial sealing capability, and when the valve is in operation, the sealing force is realized by medium pressure in the valve cavity, and the sealing force is enhanced along with the increase of the medium pressure.
As a further preferable scheme of the self-tightening sealing device, the self-tightening sealing device is in a lip shape, the cross section of the self-tightening sealing device is in an inverted U-shaped structure, the self-tightening sealing device is formed by overlapping and combining a sealing outer ring and a sealing inner ring, the sealing outer ring is made of non-metal materials and is made of any one of rubber or PTFE, and the sealing inner ring is a U-shaped metal sheet spring, so that the inner lip and the outer lip of the self-tightening sealing device are always tightly adhered to a valve rod and an outer hole wall.
By adopting the technical scheme, the lip-shaped self-tightening sealing ring for sealing the valve rod has the technical scheme that the cross section of the lip-shaped self-tightening sealing ring is in an inverted U shape, the external material of the lip-shaped ring can be rubber or PTFE (polytetrafluoroethylene) and the like, the U-shaped metal sheet spring is arranged on the inner side of the lip-shaped self-tightening sealing ring, the inner lip and the outer lip of the lip-shaped self-tightening sealing ring are always attached to the valve rod and the outer hole wall under the action of the spring to ensure the initial sealing force of double-side sealing, and the sealing force of the sealing ring is stronger when the medium pressure is higher.
As a further preferable scheme of the invention, the valve seat assembly comprises a valve seat ring, a first valve seat O-shaped ring, a second valve seat O-shaped ring, a sealing ring and an elastic body, wherein the first valve seat O-shaped ring and the second valve seat O-shaped ring are arranged on the outer side face of the valve seat ring, the valve seat ring is provided with the sealing ring close to the flashboard end, a plurality of elastic bodies are arranged close to the inflow channel end and the outflow channel end of the valve body, one end of each elastic body is arranged in a valve seat groove on the valve seat ring, and the other end of each elastic body is in contact with the inner cavity wall of the valve body, so that the end face of each sealing ring is always attached to the flashboard.
By adopting the technical scheme, the valve seat assembly is arranged between the two valve seat assemblies, the two valve seat assemblies clamp the flashboard under the action of a group of spring force at each tail part, so that the sealing end face of the valve seat is always attached to the flashboard, and the valve seat can move along the channel direction in the deformation range of the spring, and has a piston effect, namely: as the pressure of the pipeline medium increases, the sealing specific pressure between the valve seat and the flashboard increases.
As a further preferable scheme of the invention, two sides of the up-down movement position of the flashboard are respectively provided with a guide plate, two guide plate bodies are respectively arranged on an inflow channel and an inflow channel flange positioning spigot at the upper and lower stream of the inner cavity of the lower valve body, and the fit clearance between the two sides of the flashboard and the guide plates can be controlled within 0.5 mm.
According to the technical scheme, the machined part guide rail is used for replacing the casting guide rail which cannot be machined in the past, a modern sheet metal technology is utilized, namely, a steel plate is cut, bent and formed through a laser cutting machine and a numerical control bending machine, the bent guide plate is arranged on a pipe flange positioning spigot on the upper and lower sides of an inner cavity of a machined valve body, the matching dimensional precision of two sides of the flashboard and the bent guide plate can be controlled within 0.5mm, the flashboard can accurately move up and down, in addition, the horizontal upper edge of the guide plate is a stop position when the flashboard is closed in a descending mode, namely, when a right-handed hand wheel is used for closing a valve, the flashboard is in a descending mode, and a bottom plane of a valve rod nut which is longer than the thickness part of the flashboard in a valve cavity is contacted with the horizontal upper edge of the guide plate, namely, the flashboard is closed in a position.
As a further preferable scheme of the invention, the screw indicating device comprises an indicating needle and an indicating needle sleeve, wherein the upper section of the valve rod is also provided with indicating threads, the indicating needle sleeve is sleeved on the upper section of the valve rod, an indicating groove is formed in the side surface of the indicating needle sleeve, the indicating groove is parallel to the valve rod, one end of the indicating needle is positioned in the indicating groove, the other end of the indicating needle is provided with internal threads sleeved on the indicating threads, and the indicating needle sleeve is fixed on the positioning disc through a fastener; the lower section of the valve rod is provided with a working thread, the working thread is a trapezoid thread, the indicating thread is a fine thread, and the pitch of the indicating thread is smaller than that of the working thread; and the lower bearing is arranged in a positioning boss hole of the indicator sleeve on the positioning disk and fixed by a bearing gland, and the valve rod is driven by the rotary driving device to realize the movement of the flashboard to cut off the channel.
According to the technical scheme, the hidden rod valve switch position indicator is characterized in that the valve travel distance and the valve rod screw pitch are converted to obtain the number of turns of the valve rod multiplied by the thin thread screw pitch which is reduced in proportion when the valve is closed or opened, the thin thread is processed on the upper portion of the valve rod by the length which is larger than the obtained shortened distance, a nut with an indicating needle is screwed in, the switch proportional position which is co-located with a flashboard is adjusted, a sleeve with the indicating needle for displaying and anti-rotation slots is sleeved on the valve rod proportional thread section to make switch position line marks, and the sleeve is fixed, so that the actual travel distance of the valve and the switch position where the valve is located are accurately displayed in proportion by a short distance, and the outer size of the valve is increased to a limited extent.
As a further preferable scheme of the invention, a plurality of reinforcing ribs which are horizontally distributed are arranged in the lower valve body.
By adopting the technical scheme, the design technical scheme of the reinforcing rib in the valve body is that the reinforcing rib is arranged in the valve cavity under the premise of meeting the strength requirement from the aspects of casting technology and smooth and attractive appearance, and the reinforcing rib is compact in external dimension and space-saving in use.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a second cross-sectional view of the present invention;
FIG. 3 is view A-A of FIG. 2;
FIG. 4 is a schematic view of a valve body;
FIG. 5 is a detailed view of a gland;
FIG. 6 is a schematic diagram of a lip self-sealing structure;
FIG. 7 is a schematic diagram of a switch indication device;
FIG. 8 is a front view of a valve seat assembly of the present invention;
FIG. 9 is a left cross-sectional view of a valve seat assembly of the present invention;
FIG. 10 is a view of the valve cover;
FIG. 11 is a schematic view of the structure of a guide plate;
in the figure: 1-valve body, 111-lower valve body, 102-boss positioning spigot, 103-lip mouth, 104-gland contact table, 105-reinforcing rib, 2-valve cover, 201-positioning groove, 202-valve rod hole, 3-positioning disk, 301-end face positioning boss, 302-indicator sleeve positioning boss, 303-positioning disk valve rod hole, 304-bearing groove;
4-self-tightening sealing device, 5-outer sealing ring, 6-bearing, 7-sealing ring, 8-guide plate, 9-flashboard, 10-valve seat assembly, 101-valve seat ring, 102-first valve seat O-ring, 103-second valve seat O-ring, 104-sealing ring, 105-elastomer, 11-valve rod, 1101-indicating thread, 1102-trapezoidal thread, 12-screw indicating device, 121-indicating needle, 122-indicator sleeve, 13-driving device and 14-set screw.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The utility model provides a combination is shown in fig. 1, 2, 4, 9, a blind rod flat valve of flangeless and bolted connection valve gap structure, including valve body (1), flashboard (9) and drive arrangement (13), be equipped with inflow channel and outflow passageway on valve body (1), be equipped with the valve pocket between inflow channel and the outflow passageway, be equipped with flashboard (9) in the valve pocket, flashboard (9) are close to inflow channel end and outflow channel end and all are equipped with disk seat subassembly (10), and threaded connection structure is constituteed with the screw thread mouth on the flashboard to valve rod (11) one end, and valve body (1) are worn out through screw rod indicating device (12) to the other end is connected with drive arrangement (13), its characterized in that: the valve body (1) is a complete closed valve cavity formed by a lower valve body (111) and a valve cover (2) matched with the lower valve body, wherein an upper opening of the lower valve body (111) connected with the valve cover (2) is of a horizontal U-shaped lip structure, the lower valve body (111) is of a rectangular cylinder shape, a lip opening (1003), a gland contact table (1004), the gland contact table (1004) and a boss positioning spigot (1002) are arranged at the top of the lower valve body (111), the gland contact table (1004) is positioned in the center of the lip opening (1003), and the boss positioning spigot (1002) is positioned in the center of the top surface of the gland contact table (1004); the valve cover (2) is arranged in the lip-shaped opening (1003), the outer edge size of the valve cover (2) is larger than the inner opening size of the lip-shaped opening (1003), the upper end surface of the outer edge of the valve cover (2) is in contact with the plane of the inner bottom of the lip-shaped opening (1003), a sealing ring (7) is arranged at the contact position of the upper end surface and the inner bottom of the lip-shaped opening (1003), and a concentric counter bore formed by a positioning disc positioning groove (201) and a valve rod hole (202) is arranged in the center of the valve cover (2); the positioning disc (3) is installed on the gland contact table (1004) through a set screw (14), an end face positioning boss (301) is arranged at the bottom of the positioning disc (3), an indicator sleeve positioning boss (302) is arranged on the upper portion of the positioning disc, a positioning disc valve rod hole (303) and a bearing groove (304) are arranged at the center of the positioning disc (3) to form a concentric counter bore structure, the end face positioning boss (301) is matched with a boss positioning spigot (1002) on the upper portion of a lip-shaped lower valve body (111) to be positioned in a matched mode, the end face positioning boss (301) is installed in a positioning groove (201) in the center of a valve cover (2), an outer sealing ring (5) is arranged on the matched side face of the end face positioning boss (301) and the positioning groove (201), a self-tightening sealing device (4) is arranged at the end face position, and the end face positioning boss (301) and the valve cover (2) are simultaneously fastened and fixed through the set screw (14), so that the end face positioning boss (301) at the bottom of the positioning disc (3) is inserted into the positioning groove (201) in the center of the valve cover (2) to be matched with the valve cover in a concentric mode, the end face positioning boss (14), the end face positioning boss (1003) is enabled to be completely screwed with the inner bottom of the valve body, and the lip-shaped upper end face is completely contacted with the valve body, and the valve cover is completely screwed with the inner bottom.
In the embodiment, the upper opening of the valve body (1) and the valve cover (2) are of a horizontal U-shaped lip structure, the valve cover (2) is of an oblong shape, the projection size of the valve cover (2) needs to be shortened and narrowed by the inclined side of the valve cover (2) to be smaller than the inner length shaft size of the lip opening (103) of the lower valve body (111) during assembly so as to be arranged at the lip opening (103) of the lower valve body (111), the valve cover (2) is laid flat after being integrally put into the inner cavity of the lip opening (103) of the lower valve body (111), at the moment, a sealing ring (7) and a self-tightening sealing device (4) are arranged in the sealing groove at the outer edge of the valve cover (2) and in the valve rod hole, the positioning disk (3) is arranged in an inner hole positioning spigot (102) of a convex lip shape at the upper part of the lower valve body (111) to be matched with a positioning boss (301) at the upper end surface of the positioning disk (3), an O-shaped ring is arranged in a concentric indicator sleeve positioning boss (302) of the positioning disk (3) and a valve rod hole (303) of the bottom positioning disk, the positioning disk (3) is fastened by screwing in an inner hexagonal fastening screw, the valve rod hole (303) of the bottom positioning disk (3) of the positioning disk is horizontally pulled up to be inserted into a valve rod hole (202) at the center of the valve cover (2) to be concentrically matched with the valve rod hole, the inner hexagonal pre-tightening screw is screwed, the plane at the upper end of the outer edge of the valve cover (2) is completely contacted with the plane in the lip shape opening (103) of the lower valve body (111), the sealing ring (7) in the sealing groove of the valve cover (2) is completely in a pre-compression state, and the valve body and the valve cover form a complete closed valve cavity; the technical scheme of the oblong flangeless and bolted valve cover structure is that the horizontally U-shaped lip-shaped mouth without a flange at the upper end of the valve body matched with the horizontally U-shaped lip-shaped mouth is assembled into a complete sealed valve cavity in the mode, the attaching sealing force between the valve cover (2) and the valve body (1) is not completed by the prior external force of the bolts, the valve cover (2) is lifted upwards to enable the upper end plane of the outer edge of the valve cover (2) to be completely contacted with the inner plane of the lip-shaped mouth (103) of the lower valve body (111) by a pre-tightening screw during assembly, the sealing ring (7) in the sealing groove of the valve cover (2) is in a pre-tightening state, so that the sealing capability is provided, the sealing force required during working is realized by the pressure of medium in the valve cavity, and the sealing force is enhanced along with the improvement of the pressure of the medium.
Referring to fig. 2 and 6, in order to realize the replacement seal, the self-tightening sealing device (4) has a lip shape, the cross section of which is of an inverted U-shaped structure, and is formed by overlapping and combining a sealing outer ring (41) and a sealing inner ring (42), wherein the sealing outer ring (41) is made of a nonmetallic material and is made of any one of rubber or PTFE, and the sealing inner ring (42) is a U-shaped metal sheet spring, so that the inner lip and the outer lip of the self-tightening sealing device are always adhered to the valve rod and the outer hole wall; in the technical scheme of the lip-shaped self-tightening sealing ring for sealing the valve rod, the cross section of the lip-shaped self-tightening sealing ring is in an inverted U shape, the external material of the lip-shaped sealing outer ring (41) can be rubber or PTFE (polytetrafluoroethylene) and the like, the U-shaped metal sheet spring is arranged on the inner side of the lip-shaped sealing inner ring (42), the inner lip and the outer lip of the lip-shaped self-tightening sealing ring are always tightly attached to the valve rod (11) and the outer hole wall under the action of the spring to ensure the initial sealing force of double-side sealing, and the higher the medium pressure is, the stronger the self-sealing force is, so that the technical scheme is reliable in sealing, the torque of the valve rod is small, and the filler-type sealing is replaced.
Referring to fig. 1 and 8, in order to achieve a zero leakage sealing effect, the valve seat assembly (10) includes a valve seat ring (101), a first valve seat O-ring (102), a second valve seat O-ring (103), a sealing ring (104) and an elastomer (105), wherein the first valve seat O-ring (102) and the second valve seat O-ring (103) are disposed on an outer side surface of the valve seat ring (101), the valve seat ring (101) is provided with the sealing ring (104) near a gate plate (9), inflow channel ends and outflow channel ends near the valve body (1) are provided with a plurality of elastomers (105), one end of each elastomer (105) is disposed in a valve seat groove (1001) on the valve seat ring (101), and the other end of each elastomer is in contact with an inner cavity wall of the valve body (1) so that the end surface of the sealing ring (104) is always attached to the gate plate (9); in this embodiment, the flashboard (9) is placed between two valve seat components (10), the two valve seat components (10) clamp the flashboard (9) under the action of the spring force of a group of elastic bodies (105) at each tail part, so that the valve seat sealing end face is always attached to the flashboard (9), the valve seat components (10) can move along the channel direction in the deformation range of the spring, and the piston effect is that is: as the pressure of the pipeline medium increases, the sealing specific pressure between the valve seat assembly (10) and the flashboard (9) increases.
As shown in fig. 2, 3 and 10, two sides of the up-and-down movement position of the gate plate (9) are respectively provided with a guide plate (8), two guide plates (8) are respectively arranged on an inflow channel and an inflow channel flange positioning spigot at the upper and lower sides of the inner cavity of the lower valve body (111), and the fit clearance between two sides of the gate plate (9) and the guide plates (8) can be controlled within 0.5 mm. In the embodiment, a machined part guide rail is used for replacing a casting guide rail which cannot be machined in the past, a modern sheet metal technology is utilized, namely, a steel plate is cut, bent and formed through a laser cutting machine and a numerical control bending machine, a bending guide plate (8) is arranged on a pipe flange positioning spigot on the upper and lower sides of an inner cavity of a machined valve body (1), the matching dimensional precision of two sides of a flashboard (9) and the bent guide plate (8) can be controlled within 0.5mm, the flashboard (9) can precisely move up and down, in addition, the horizontal upper edge of the guide plate (8) is a stop position when the flashboard (9) is closed in a descending mode, namely, when a right-handed driving device (13) closes a valve, the flashboard (9) descends, and meanwhile, a bottom plane of a valve rod (11) nut in a valve cavity, which is longer than a flashboard thickness part, touches the horizontal upper edge of the guide plate (8), namely, the flashboard (9) is closed in place.
Referring to fig. 2 and 7, the screw indicating device (12) comprises an indicating needle (121) and an indicating needle sleeve (122), an indicating thread (1101) is further arranged on the upper section of the valve rod (11), the indicating needle sleeve (122) is sleeved on the upper section of the valve rod (11), an indicating groove (1221) is formed in the side face of the indicating needle sleeve (122), the indicating groove (1221) is parallel to the valve rod (11), one end of the indicating needle (121) is located in the indicating groove (1221), an internal thread sleeve is arranged at the other end of the indicating needle (121) and screwed on the indicating thread (1101), and the indicating needle sleeve (122) is fixed on the positioning disc (3) through a fastener; the lower section of the valve rod 11 is provided with a working thread 1102, the working thread (1102) is a trapezoid thread, the indicating thread (1101) is a fine thread, and the pitch of the indicating thread (1101) is smaller than that of the working thread (1102); the lower bearing (6) is arranged in the hole of the indicator sleeve positioning boss (302) on the positioning disc (3), and is fixed by a bearing gland, and the valve rod (11) is driven by the rotary driving device (13) to realize the movement of the flashboard (9) to cut off the channel; the principle of the embodiment is that the valve travel distance and the screw pitch of the valve rod (11) are converted to obtain the rotation circle number of the valve rod (11) multiplied by the scaled fine thread pitch when the valve is closed or opened, the fine thread is processed on the upper part of the valve rod by the length which is larger than the obtained shortened distance, a nut with an indicating needle (121) is screwed in, the switch proportion position which is in the same position as the flashboard (9) is adjusted, an indicating groove (1221) with the indicating needle (121) for displaying and preventing the rotation of the groove is sleeved on the proportional thread section of the valve rod (11), the mark of the switch position is made, the sleeve is fixed, the actual travel distance of the valve and the switch position where the valve is positioned are accurately displayed in proportion by a short distance, and the increase of the outer dimension height of the valve is limited.
As shown in fig. 2, in order to meet the strength requirement, from the viewpoints of a casting process, smooth and attractive appearance and light weight, a plurality of reinforcing ribs (105) which are horizontally distributed are arranged in the lower valve body (111), so that the external dimension is compact in use and space is saved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a blind rod flat valve of flangeless and bolted connection valve gap structure, includes valve body (1), flashboard (9) and drive arrangement (13), be equipped with inflow channel and outflow passageway on valve body (1), be equipped with the valve pocket between inflow channel and the outflow passageway, be equipped with flashboard (9) in the valve pocket, flashboard (9) are close to inflow channel end and outflow channel end all are equipped with disk seat subassembly (10), and threaded connection structure is constituteed with the screw thread mouth on the flashboard to valve rod (11) one end, and valve body (1) are worn out through screw rod indicating device (12) to the other end is connected with drive arrangement (13), its characterized in that: the valve body (1) is a complete closed valve cavity formed by a lower valve body (111) and a valve cover (2) matched with the lower valve body, wherein an upper opening of the lower valve body (111) connected with the valve cover (2) is of a horizontal U-shaped lip structure, the lower valve body (111) is of a rectangular cylinder shape, a lip opening (1003), a gland contact table (1004) and a boss positioning spigot (1002) are arranged at the top of the lower valve body (111), the gland contact table (1004) is positioned at the center of the lip opening (1003), and the boss positioning spigot (1002) is positioned at the center of the top surface of the gland contact table (1004);
the valve cover (2) is arranged in the lip-shaped opening (1003), the outer edge size of the valve cover (2) is larger than the inner opening size of the lip-shaped opening (1003), the upper end surface of the outer edge of the valve cover (2) is in contact with the plane of the inner bottom of the lip-shaped opening (1003), a sealing ring (7) is arranged at the contact position of the upper end surface and the inner bottom of the lip-shaped opening (1003), and a concentric counter bore formed by a positioning disc positioning groove (201) and a valve rod hole (202) is arranged in the center of the valve cover (2);
the positioning disc (3) is installed on the gland contact table (1004) through a set screw (14), an end face positioning boss (301) is arranged at the bottom of the positioning disc (3), an indicator sleeve positioning boss (302) is arranged on the upper portion of the positioning disc, a positioning disc valve rod hole (303) and a bearing groove (304) are arranged at the center of the positioning disc (3) to form a concentric counter bore structure, the end face positioning boss (301) is matched with a boss positioning spigot (1002) on the upper portion of a lip-shaped lower valve body (111) to be positioned in a matched mode, the end face positioning boss (301) is installed in a positioning groove (201) in the center of a valve cover (2), an outer sealing ring (5) is arranged on the matched side face of the end face positioning boss (301) and the positioning groove (201), a self-tightening sealing device (4) is arranged at the end face position, and the end face positioning boss (301) and the valve cover (2) are simultaneously fastened and fixed through the set screw (14), so that the end face positioning boss (301) at the bottom of the positioning disc (3) is inserted into the positioning groove (201) in the center of the valve cover (2) to be matched with the valve cover in a concentric mode, the end face positioning boss (14), the end face positioning boss (1003) is enabled to be completely screwed with the inner bottom of the valve body, and the lip-shaped upper end face is completely contacted with the valve body, and the valve cover is completely screwed with the inner bottom.
2. The blind rod flat valve with the flange-free and bolt-connected valve cover structure according to claim 1, wherein the self-tightening sealing device (4) is of a lip shape, the cross section of the blind rod flat valve is of an inverted U-shaped structure, the blind rod flat valve is formed by overlapping and combining a sealing outer ring (41) and a sealing inner ring (42), the sealing outer ring (41) is made of a nonmetallic material and is any one of rubber or PTFE, and the sealing inner ring (42) is a U-shaped metal sheet spring, so that the inner lip and the outer lip of the self-tightening sealing device are always abutted against a valve rod and an outer hole wall.
3. The blind rod flat valve with the flange-free and bolt-connected valve cover structure according to claim 1, wherein the valve seat assembly (10) comprises a valve seat ring (101), a first valve seat O-shaped ring (102), a second valve seat O-shaped ring (103), a sealing ring (104) and an elastic body (105), wherein the first valve seat O-shaped ring (102) and the second valve seat O-shaped ring (103) are arranged on the outer side surface of the valve seat ring (101), the valve seat ring (101) is provided with the sealing ring (104) close to the end of the flashboard (9), a plurality of elastic bodies (105) are arranged close to the inflow channel end and the outflow channel end of the valve body (1), one end of each elastic body (105) is arranged in a valve seat groove (1001) on the valve seat ring (101), and the other end of each elastic body is in contact with the inner cavity wall of the valve body (1), so that the end face of the sealing ring (104) is always attached to the flashboard (9).
4. The blind rod flat valve with the flange-free and bolt-connected valve cover structure according to claim 1, wherein guide plates (8) are respectively arranged on two sides of the up-and-down movement position of the gate plate (9), two guide plates (8) are respectively arranged on an inflow channel and an inflow channel flange positioning spigot on the upper and lower sides of the inner cavity of the lower valve body (111), and the fit clearance between two sides of the gate plate (9) and the guide plates (8) can be controlled within 0.5 mm.
5. The blind rod flat valve without flange and bolt connection valve cover structure according to claim 1, characterized in that the screw indicating device (12) comprises an indicating needle (121) and an indicating needle sleeve (122), the upper section of the valve rod (11) is further provided with an indicating thread (1101), the indicating needle sleeve (122) is sleeved on the upper section of the valve rod (11), an indicating groove (1221) is arranged on the side surface of the indicating needle sleeve (122), the indicating groove (1221) is parallel to the valve rod (11), one end of the indicating needle (121) is positioned in the indicating groove (1221), the other end of the indicating needle (121) is provided with an internal thread sleeved on the indicating thread (1101), and the indicating needle sleeve (122) is fixed on the positioning disc (3) through a fastener; the lower section of the valve rod (11) is provided with a working thread (1102), the working thread (1102) is a trapezoid thread, the indication thread (1101) is a fine thread, and the pitch of the indication thread (1101) is smaller than that of the working thread (1102); and the lower bearing (6) is arranged in the hole of the indicator sleeve positioning boss (302) on the positioning disc (3), and is fixed by a bearing gland, and the valve rod (11) is driven by the rotary driving device (13) to realize the movement of the flashboard (9) to cut off the channel.
6. A blind rod flat valve without flange and bolted valve cover structure according to claim 3, wherein:
a plurality of reinforcing ribs (105) which are horizontally distributed are arranged in the lower valve body (111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232363.0A CN109826970B (en) | 2019-03-26 | 2019-03-26 | Hidden rod flat valve without flange and bolt connection valve cover structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232363.0A CN109826970B (en) | 2019-03-26 | 2019-03-26 | Hidden rod flat valve without flange and bolt connection valve cover structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109826970A CN109826970A (en) | 2019-05-31 |
| CN109826970B true CN109826970B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910232363.0A Active CN109826970B (en) | 2019-03-26 | 2019-03-26 | Hidden rod flat valve without flange and bolt connection valve cover structure |
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| Country | Link |
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| CN (1) | CN109826970B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116498760B (en) * | 2023-06-26 | 2023-08-22 | 什邡慧丰采油机械有限责任公司 | Flat valve with combined double-valve-seat precise sealing structure and working method |
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| CN109424756A (en) * | 2017-08-23 | 2019-03-05 | 永嘉县信诚科技服务有限公司 | Self-sealing stop valve |
| CN210600231U (en) * | 2019-03-26 | 2020-05-22 | 良工阀门集团有限公司 | Non-rising stem flat valve without flange and bolted connection valve cover structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9746095B2 (en) * | 2013-07-17 | 2017-08-29 | Fisher Controls International Llc | Apparatus to attach a fluid valve bonnet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737514A (en) * | 2008-11-07 | 2010-06-16 | 浙江西麦克阀门制造有限公司 | Wedge type abrasion resistant plug valve |
| CN203604684U (en) * | 2013-12-03 | 2014-05-21 | 南通市电站阀门有限公司 | Main water supply forged steel gate valve with ultra-large caliber |
| CN204961867U (en) * | 2015-01-24 | 2016-01-13 | 浙江华大阀门有限公司 | Power station is with novel high temperature high pressure sluice valve |
| CN205101589U (en) * | 2015-10-21 | 2016-03-23 | 南通市电站阀门有限公司 | Forge economical orifice plate gate valve entirely |
| CN109424756A (en) * | 2017-08-23 | 2019-03-05 | 永嘉县信诚科技服务有限公司 | Self-sealing stop valve |
| CN210600231U (en) * | 2019-03-26 | 2020-05-22 | 良工阀门集团有限公司 | Non-rising stem flat valve without flange and bolted connection valve cover structure |
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| CN109826970A (en) | 2019-05-31 |
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Address after: 325000 Zhejiang province Wenzhou Longwan District Yongxing Street Hong Kong Road 32 Patentee after: Lianggu Valve Group Co.,Ltd. Address before: 325000 Zhejiang province Wenzhou Longwan District Yongxing Street Hong Kong Road 32 Patentee before: LIANGGONG VALVE GROUP CO.,LTD. |