[go: up one dir, main page]

CN111609164A - Steel gate valve - Google Patents

Steel gate valve Download PDF

Info

Publication number
CN111609164A
CN111609164A CN202010538357.0A CN202010538357A CN111609164A CN 111609164 A CN111609164 A CN 111609164A CN 202010538357 A CN202010538357 A CN 202010538357A CN 111609164 A CN111609164 A CN 111609164A
Authority
CN
China
Prior art keywords
positioning
sleeve
guide
valve
pressing ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010538357.0A
Other languages
Chinese (zh)
Inventor
蓝晶晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010538357.0A priority Critical patent/CN111609164A/en
Publication of CN111609164A publication Critical patent/CN111609164A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
    • F16K3/14—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces with special arrangements for separating the sealing faces or for pressing them together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
    • F16K27/047—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members with wedge-shaped obturating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/316—Guiding of the slide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

The invention relates to the technical field of gate valves, in particular to a steel gate valve which comprises a valve body, a valve cover, a valve rod and a gate plate. According to the invention, the space between the guide fork and the inlet guide sheet and the space between the guide fork and the outlet guide sheet are respectively controlled through the medium pressure change formed by opening and closing the flashboard, so that the guide forks extended and arranged at two sides of the flashboard are mutually matched with the positioning rod and the positioning device, the positioning rod and the guide fork can only move up and down along the guide assembly, the flashboard is prevented from shaking, the vibration of the flashboard caused by medium impact is reduced, and the service life of the flashboard is prolonged.

Description

Steel gate valve
Technical Field
The invention relates to the technical field of gate valves, in particular to a steel gate valve.
Background
The gate valve is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like.
The wedge gate valve has a good sealing effect because the sealing surface of the valve forms a certain angle with the vertical center line, so that the wedge gate valve can bear larger pressure.
In the prior art, a valve rod of a wedge gate valve is freely connected with a flashboard (namely, a gap is reserved between a pull head and a pull sleeve). When a gate valve is used as a control valve, a stop valve, a control valve, or a bypass valve, the half-opened gate plate is used for control in a half-opened throttle state, and the half-opened gate plate is subjected to impact during flow, so that violent vibration is likely to occur, and the end portion of the valve stem (i.e., the slider) is likely to be broken by abrasion.
Disclosure of Invention
The invention aims to overcome the defects and provide a steel gate valve.
In order to achieve the purpose, the technical solution of the invention is as follows: a steel gate valve comprises a valve body, a valve cover, a valve rod and a gate plate, wherein the valve cover is arranged on the valve body and is connected with the valve body to form a middle cavity; the flashboard is arranged in the valve body, and a pull sleeve is arranged on the flashboard; the lower end of the valve rod is provided with a pull head matched with the pull sleeve; the lower end of the valve rod penetrates through the valve cover and is positioned in the middle cavity, so that the pull head is arranged on the pull sleeve; the flashboard divides the interior of the valve body into an inlet cavity and an outlet cavity.
Two guide forks are arranged on the lower portion of the flashboard in a manner of radially extending outwards and are symmetrically arranged.
The inner wall of the upper part of the valve body is provided with a step surface, and the step surface is positioned on the guide fork; a positioning device is arranged in the valve body; the positioning device comprises a cylinder sleeve and a positioning rod.
The cylinder sleeve is arranged on the step surface; breathing holes which penetrate through the valve body and the cylinder sleeve are formed in the side wall of the valve body and the side wall of the cylinder sleeve; the inner port of the breathing hole is communicated with the lower part in the cylinder sleeve, so that the inside of the cylinder sleeve is communicated with the outside of the valve body, and the piston can move downwards conveniently.
A cylinder cover is fixedly arranged at the top of the cylinder sleeve, and an upper through hole is formed in the cylinder cover; an upper pressing ring is arranged below the upper through hole; a lower through hole is formed below the cylinder sleeve, and a lower pressing ring is arranged on the lower through hole; an inner positioning sleeve is arranged between the upper pressing ring and the lower pressing ring; and a flange is arranged at the lower end of the inner positioning sleeve radially outwards.
A positioning rod is longitudinally arranged in the middle of the inner positioning sleeve; the upper end part of the positioning rod extends upwards through the upper pressing ring and the upper through hole and is positioned on the cylinder cover; the lower end of the positioning rod penetrates through the lower pressing ring and the lower through hole and is connected with the guide fork.
A piston is arranged in the cylinder sleeve and is positioned between the upper through hole and the breathing hole; the middle of the piston is provided with a piston pipe in an upward protruding manner; the piston pipe is sleeved outside the inner positioning sleeve, and the axial length of the piston pipe is smaller than that of the inner positioning sleeve; the piston pipe is positioned below the upper pressing ring; and a vertical push spring is arranged between the flange and the piston.
A positioning column is arranged below the piston, and the outer diameter of the lower part of the positioning column is gradually increased from bottom to top; the lower pressing ring is provided with an upper positioning hole matched with the positioning column; and the bottom wall of the cylinder sleeve is provided with a lower positioning hole corresponding to the upper positioning hole.
An inner table top is arranged in the middle of the inner wall of the cylinder sleeve, and a transverse plate is fixedly arranged on the inner table top; the transverse plate is sleeved outside the piston tube in a hollow way; a piston cavity is formed between the transverse plate and the piston; the middle part of the side wall of the cylinder sleeve is provided with a pressure guide hole; the pressure guide hole is communicated with the piston cavity.
And a guide assembly is arranged below the positioning device and fixed in the valve body.
Preferably, the guide fork comprises a positioning piece, a pushing piece and a transverse pushing spring; the transverse push spring is arranged between the positioning sheet and the push sheet; the locating plate is fixedly connected with the flashboard.
Preferably, the guide assembly comprises an inlet guide sheet close to the inlet chamber, and an outlet guide sheet close to the outlet chamber; a guide gap is arranged between the inlet side guide sheet and the outlet side guide sheet, and the width of the guide gap is not less than that of the guide fork; the positioning piece is close to the inlet side guide piece; the push sheet is close to the leading-out side guide sheet; the lower end part of the positioning rod penetrates through the guide gap and is connected with the positioning sheet.
Preferably, the number of the positioning columns is two, and the two positioning columns correspond to the side inlet guide sheet and the side outlet guide sheet respectively.
Preferably, a plurality of lower steel coins are arranged between the lower pressing ring and the flange, and the lower steel coins are arranged on the lower pressing ring; the upper end face of the steel coin is higher than the upper end face of the lower pressing ring; the axial direction of the downward steel coin is perpendicular to the expansion direction of the lateral pushing spring.
Preferably, a plurality of upper coins are arranged between the upper pressing ring and the cylinder cover, and the upper coins are arranged on the upper pressing ring; the upper end face of the upper steel coin is higher than the upper end face of the upper pressing ring; the axial direction of the steel coin is vertical to the expansion direction of the horizontal push spring.
Preferably, the cylinder sleeve is fixedly mounted on the inner wall of the valve body through a connecting bolt.
Preferably, an outer positioning sleeve is arranged in the cylinder sleeve and is positioned on the transverse plate; the axial height of the outer positioning sleeve is equal to the distance between the transverse plate and the cylinder cover; the inner diameter of the outer positioning sleeve is larger than the outer diameter of the upper pressing ring.
Preferably, a support is arranged on the valve cover, and a threaded sleeve is arranged at the upper end of the support; the screw sleeve is upwards provided with an extending part; the upper part of the valve rod is in threaded connection with the threaded sleeve; and a hand wheel is arranged outside the extension part of the screw sleeve.
Preferably, a packing structure is arranged between the valve rod and the valve cover; the packing structure comprises packing, a gland and a loose joint bolt; an inwards concave filling groove is formed in the valve cover, and the filling is filled in the filling groove; the lower part of the gland is matched with the packing groove and is used for compressing the packing in the packing groove; the gland and the valve cover are fixedly connected through a loose joint bolt.
In the traditional wedge gate valve, a guide shin is arranged on the wall part of a cavity in a valve body, and due to machining or installation errors, in order to ensure that two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a flashboard and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a valve seat can form sealing simultaneously, a gap must be reserved between the outer side of the flashboard and the guide shin, interference cannot be formed, and a valve rod of the wedge gate valve is freely connected with the flashboard (namely, a gap is reserved between a pull head and a pull sleeve), and interference cannot be formed.
When the valve is closed, namely two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the flashboard and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat can form sealing simultaneously, a gap must be reserved between the guide fork and the guide assembly without interference, and a valve rod of the wedge type gate valve is freely connected with the flashboard (namely the gap is reserved between the pull head and the pull sleeve), so that interference is not formed. When the valve is opened, the positioning rod is matched with the positioning device, so that the positioning rod can only move up and down and cannot move left and right back and forth, the flashboard is further fixed, the flashboard is prevented from shaking, when the semi-opened flashboard is impacted by a medium in the flowing process, violent vibration cannot be caused, and the end part (namely a pull head) of the valve rod can be broken due to abrasion.
Description of the principles of the invention:
when the flashboard is opened, the inlet cavity is communicated with the middle cavity and the outlet cavity, a medium in the middle cavity enters the piston cavity through the pressure guide hole to push the piston and the positioning column to move downwards, the positioning column enters the upper positioning hole and the lower positioning hole to prevent the lower pressing ring from moving transversely, so that the positioning rod is fixed to move transversely and can only move upwards and downwards, the flashboard is fixedly connected with the guide fork, the guide fork is fixedly connected with the positioning rod respectively, and finally the flashboard can only move upwards and downwards, and when the flashboard which is half opened in the flow is impacted by the medium, the flashboard cannot cause violent vibration.
When the flashboard is closed, because the guide fork comprises the positioning piece, the transverse pushing spring and the pushing piece, under the action of the pushing piece, the contact between the inlet side sealing surface of the flashboard and the inlet side sealing surface of the valve seat is formed earlier than the contact between the outlet side sealing surface of the flashboard and the outlet side sealing surface of the valve seat. Therefore, when the inlet side sealing surface of the gate plate is contacted with the inlet side sealing surface of the valve seat, the medium of the inlet cavity flows to the middle cavity at a flow rate which is smaller than the medium of the middle cavity flows to the outlet cavity. At the moment, the medium pressure in the middle cavity is reduced, so that the medium pressure in the piston cavity is reduced, the piston and the positioning column move upwards under the pushing action of the vertical pushing spring, the positioning column is separated upwards from the lower pressing ring, the positioning column and the lower pressing ring can move transversely along with the guide fork and the flashboard, and the sealing surfaces (the inlet sealing surface and the outlet sealing surface) on the two sides of the flashboard form sealing with the two sealing surfaces (the inlet sealing surface and the outlet sealing surface) of the valve seat respectively along with the downward movement of the flashboard.
By adopting the technical scheme, the invention has the beneficial effects that: according to the invention, the space between the guide fork and the inlet guide sheet and the space between the guide fork and the outlet guide sheet are respectively controlled through the medium pressure change formed by opening and closing the flashboard, so that the guide forks extending from two sides of the flashboard are mutually matched with the positioning rod and the positioning device, the positioning rod and the guide fork can only move up and down along the guide assembly, the flashboard is prevented from shaking, the vibration of the flashboard caused by medium impact is reduced, and the service lives of the flashboard and the valve rod are prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic sectional view taken along line D-D in FIG. 2;
fig. 4 is an enlarged view of the guide fork of fig. 3.
Description of the main reference numerals: 1. a valve body; 3. a shutter plate; 4. an inlet chamber; 5. a slider; 6. pulling the sleeve; 7. a valve cover; 8. a valve stem; 9. a filler; 10. loose joint bolts; 11. a gland; 12. a support; 13. a threaded sleeve; 14. a hand wheel; 15. a middle cavity; 16. an outlet chamber; 17. a valve seat; 18. a connecting bolt; 19. a breathing hole; 20. a positioning device; 21. a guide assembly; 22. positioning a rod; 23. a guide fork; 29. a side guide sheet is fed; 30. positioning plates; 31. transversely pushing the spring; 32. pushing the sheet; 33. a leading-out guide sheet; 34. a guide gap; 35. a lower through hole; 36. a lower positioning hole; 37. an upper positioning hole; 38. a positioning column; 39. a piston; 40. a piston cavity; 41. a pressure guide hole; 42. a transverse plate; 43. a cylinder liner; 44. an outer locating sleeve; 45. an upper pressing ring; 46. a steel coin up; 47. a cylinder cover; 48. an upper through hole; 49. an inner positioning sleeve; 50. a vertical push spring; 51. dropping steel coins; 52. pressing a ring; 53. a step surface; 54. a flange; 55. a piston tube; 56. an inner table-board; 57. and (4) a packing groove.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments. The directional phrases used in this disclosure include, for example: the directional terms such as up, down, left, right, inner, outer, etc. are used only with reference to the orientation of the attached FIG. 1 of the specification. Accordingly, the directional terminology used is intended to be illustrative only and is not intended to be limiting of the invention.
As shown in fig. 1-4, the steel gate valve of the present invention comprises a valve body 1, a valve cover 7, a valve rod 8 and a gate plate 3, wherein the valve cover 7 is installed on the valve body 1, and the valve cover 7 is connected with the valve body 1 to form a middle cavity 15; the flashboard 3 is arranged in the valve body 1, and a pull sleeve 6 is arranged on the flashboard 3; the lower end of the valve rod 8 is provided with a pull head 5 matched with the pull sleeve 6. The lower end of the valve rod 8 penetrates through the valve cover 7 and is positioned in the middle cavity 15, so that the pull head 5 is installed on the pull sleeve 6.
A bracket 12 is arranged on the valve cover 7, and a threaded sleeve 13 is arranged at the upper end part of the bracket 12; the screw sleeve 13 is upwards provided with an extending part; the upper part of the valve rod 8 is in threaded connection with a threaded sleeve 13; a hand wheel 14 is arranged outside the extension part of the screw sleeve 13.
A packing 9 structure is arranged between the valve rod 8 and the valve cover 7; the packing 9 structure comprises a packing 9, a gland 11 and a loose joint bolt 10; an inwards concave filling groove 57 is formed in the upper surface of the valve cover 7, and the filling 9 is filled in the filling groove 57; the lower part of the gland 11 is matched with the packing groove 57 and is used for pressing the packing 9 in the packing groove 57; the gland 11 and the valve cover 7 are fixedly connected through a loose joint bolt 10.
The shutter plate 3 divides the interior of the valve body 1 into an inlet chamber 4 and an outlet chamber 16.
Two guide forks 23 extend outwards in the radial direction at the lower part of the gate plate 3, and the two guide forks 23 are symmetrically arranged. The guide fork 23 comprises a positioning sheet 30, a pushing sheet 32 and a transverse pushing spring 31; the transverse push spring 31 is arranged between the positioning sheet 30 and the push sheet 32; the positioning plate 30 is fixedly connected with the shutter 3.
A step surface 53 is arranged on the inner wall of the upper part of the valve body 1, and the step surface 53 is positioned on the guide fork 23; a positioning device 20 is arranged in the valve body 1; the positioning device 20 comprises a cylinder sleeve 43 and a positioning rod 22.
The cylinder sleeve 43 is mounted on the step surface 53; the cylinder sleeve 43 is fixedly installed on the inner wall of the valve body 1 through the connecting bolt 18. Breathing holes 19 which penetrate through the valve body 1 and the cylinder sleeve 43 to communicate are formed in the side wall of the valve body 1 and the side wall of the cylinder sleeve 43; the inner port of the breathing hole 19 is communicated with the lower part in the cylinder sleeve 43.
A cylinder cover 47 is fixedly installed at the top of the cylinder sleeve 43, and an upper through hole 48 is formed in the cylinder cover 47; an upper pressing ring 45 is arranged below the upper through hole 48; a lower through hole 35 is formed below the cylinder sleeve 43, and a lower pressing ring 52 is arranged above the lower through hole 35; an inner positioning sleeve 49 is arranged between the upper pressing ring 45 and the lower pressing ring 52; the lower end of the inner sleeve 49 is provided with a flange 54 radially outwardly.
A positioning rod 22 is longitudinally arranged in the middle of the inner positioning sleeve 49; the upper end part of the positioning rod 22 extends upwards through the upper pressing ring 45 and the upper through hole 48 and is positioned on the cylinder cover 47; the lower end of the positioning rod 22 passes through the lower pressing ring 52 and the lower through hole 35 and is connected with the guide fork 23.
A piston 39 is arranged in the cylinder sleeve 43, and the piston 39 is positioned between the upper through hole 48 and the breathing hole 19; a piston pipe 55 is arranged in the middle of the piston 39 in an upward protruding mode; the piston pipe 55 is sleeved outside the inner positioning sleeve 49, and the axial length of the piston pipe 55 is smaller than that of the inner positioning sleeve 49; the piston tube 55 is located below the upper clamping ring 45; a vertical push spring 50 is mounted between the flange 54 and the piston 39.
A positioning column 38 is arranged below the piston 39, and the outer diameter of the lower part of the positioning column 38 is gradually increased from bottom to top; the positioning post 38 has an inverted cone shape. The lower pressing ring 52 is provided with an upper positioning hole 37 matched with the positioning column 38; the bottom wall of the cylinder sleeve 43 is provided with a lower positioning hole 36 corresponding to the upper positioning hole 37.
An inner table-board 56 is arranged in the middle of the inner wall of the cylinder sleeve 43, and a transverse plate 42 is fixedly arranged on the inner table-board 56; the transverse plate 42 is sleeved outside the piston tube 55; a piston cavity 40 is formed between the transverse plate 42 and the piston 39; the middle part of the side wall of the cylinder sleeve 43 is provided with a pressure guide hole 41; the pilot pressure hole 41 communicates with the piston chamber 40. An outer positioning sleeve 44 is arranged in the cylinder sleeve 43, and the outer positioning sleeve 44 is positioned on the transverse plate 42; the axial height of the outer positioning sleeve 44 is equal to the distance between the transverse plate 42 and the cylinder cover 47; the inner diameter of the outer positioning sleeve 44 is larger than the outer diameter of the upper clamping ring 45.
A guide assembly 21 is arranged below the positioning device 20, and the guide assembly 21 is fixed in the valve body 1. The guide assembly 21 comprises an inlet guide vane 29 adjacent the inlet chamber 4, an outlet guide vane 33 adjacent the outlet chamber 16; a guide gap 34 is arranged between the leading-in guide sheet and the leading-out guide sheet 33 at intervals, and the width of the guide gap 34 is not less than that of the guide fork 23; the positioning piece 30 is close to the inlet guide piece; the push piece 32 is close to the leading-out guide piece 33; the lower end of the positioning rod 22 passes through the guide gap 34 and is connected to the positioning piece 30.
Two positioning columns 38 are provided, and correspond to the inlet guide piece 29 and the outlet guide piece 33 respectively.
A plurality of lower steel coins 51 are arranged between the lower pressing ring 52 and the flange 54, and the lower steel coins 51 are arranged on the lower pressing ring 52; the upper end face of the lower steel coin 51 is higher than the upper end face of the lower pressing ring 52; the axial direction of the steel coin 51 is perpendicular to the expansion and contraction direction of the lateral push spring 31.
A plurality of upper coins 46 are arranged between the upper pressing ring 45 and the cylinder cover 47, and the upper coins 46 are arranged on the upper pressing ring 45; the upper end face of the upper steel coin 46 is higher than the upper end face of the upper pressing ring 45; the axial direction of the upper steel coin 46 is perpendicular to the expansion and contraction direction of the lateral pushing spring 31.
In the traditional wedge gate valve, a guide shin is arranged on the wall part of a cavity 15 in a valve body 1, and due to machining or installation errors, in order to ensure that two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a flashboard 3 and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a valve seat 17 can form sealing simultaneously, a gap must be reserved between the outer side of the flashboard 3 and the guide shin, interference cannot be formed, and a valve rod 8 of the wedge gate valve is freely connected with the flashboard 3 (namely, the gap is reserved between a pull head 5 and a pull sleeve 6), and interference cannot be formed.
When the valve is closed, namely two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the gate plate 3 and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat 17 can form sealing simultaneously, a gap is required to be reserved between the guide fork 23 and the guide assembly 21 without forming interference, and the valve rod 8 of the wedge type gate valve is freely connected with the gate plate 3 (namely the gap is reserved between the pull head 5 and the pull sleeve 6) without forming interference. When the valve is opened, the positioning rod 22 is matched with the positioning device 20, so that the positioning rod 22 can only move up and down and can not move left and right back and forth, the flashboard 3 is further fixed, the flashboard 3 is prevented from shaking, when the flashboard 3 which is half opened in the flowing process is impacted by a medium, violent vibration can not be caused, and the end part (namely the pull head 5) of the valve rod 8 is easy to break without abrasion.
Description of the principles of the invention:
when the gate plate 3 is opened, the inlet cavity 4 is communicated with the middle cavity 15 and the outlet cavity 16, a medium in the middle cavity 15 enters the piston cavity 40 through the pressure guiding hole 41 to push the piston 39 and the positioning column 38 to move downwards, the positioning column 38 enters the upper positioning hole 37 and the lower positioning hole 36 to prevent the lower pressing ring 52 from moving transversely, so that the positioning rod 22 is fixed to move transversely, the positioning rod 22 can only move up and down, the gate plate 3 is fixedly connected with the guide fork 23, the guide fork 23 is respectively and fixedly connected with the positioning rod 22, the gate plate 3 is finally controlled to move up and down, and when the half-opened gate plate 3 in the flow is impacted by the medium, the gate plate 3 cannot cause violent vibration.
When the shutter 3 is closed, since the guide fork 23 includes the positioning piece 30, the lateral pushing spring 31, and the pushing piece 32, contact is made between the inlet side sealing surface of the shutter 3 and the inlet side sealing surface of the valve seat 17 by the pushing piece 32 earlier than between the outlet side sealing surface of the shutter 3 and the outlet side sealing surface of the valve seat 17. Therefore, when the inlet side sealing surface of the shutter plate 3 is in contact with the inlet side sealing surface of the valve seat 17, the flow rate of the medium flowing from the inlet chamber 4 to the middle chamber 15 is smaller than the flow rate of the medium flowing from the middle chamber 15 to the outlet chamber 16. At this time, the medium pressure in the middle chamber 15 is reduced, so that the medium pressure in the piston chamber 40 is reduced, the piston 39 and the positioning column 38 move upward under the urging action of the vertical urging spring 50, the positioning column 38 is separated upward from the lower pressing ring 52, the positioning rod 22 and the lower pressing ring 52 can move laterally along with the guide fork 23 and the shutter 3, and the sealing surfaces (the inlet sealing surface and the outlet sealing surface) on both sides of the shutter 3 form sealing with the two sealing surfaces (the inlet sealing surface and the outlet sealing surface) of the valve seat 17 along with the downward movement of the shutter 3.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the present invention, and all equivalent variations and modifications made in the claims of the present invention should be included in the scope of the present invention.

Claims (10)

1. A steel gate valve comprises a valve body, a valve cover, a valve rod and a gate plate, wherein the valve cover is arranged on the valve body and is connected with the valve body to form a middle cavity; the flashboard is arranged in the valve body, and a pull sleeve is arranged on the flashboard; the lower end of the valve rod is provided with a pull head matched with the pull sleeve; the lower end of the valve rod penetrates through the valve cover and is positioned in the middle cavity, so that the pull head is arranged on the pull sleeve; the gate plate divides the interior of the valve body into an inlet cavity and an outlet cavity; the method is characterized in that: two guide forks are arranged at the lower part of the flashboard in a radially outward extending manner and are symmetrically arranged;
the inner wall of the upper part of the valve body is provided with a step surface, and the step surface is positioned on the guide fork; a positioning device is arranged in the valve body; the positioning device comprises a cylinder sleeve and a positioning rod;
the cylinder sleeve is arranged on the step surface; breathing holes which penetrate through the valve body and the cylinder sleeve are formed in the side wall of the valve body and the side wall of the cylinder sleeve; the inner port of the breathing hole is communicated with the lower part in the cylinder sleeve;
a cylinder cover is fixedly arranged at the top of the cylinder sleeve, and an upper through hole is formed in the cylinder cover; an upper pressing ring is arranged below the upper through hole; a lower through hole is formed below the cylinder sleeve, and a lower pressing ring is arranged on the lower through hole; an inner positioning sleeve is arranged between the upper pressing ring and the lower pressing ring; a flange is arranged at the lower end of the inner positioning sleeve radially outwards;
a positioning rod is longitudinally arranged in the middle of the inner positioning sleeve; the upper end part of the positioning rod extends upwards through the upper pressing ring and the upper through hole and is positioned on the cylinder cover; the lower end of the positioning rod penetrates through the lower pressing ring and the lower through hole and is connected with the guide fork;
a piston is arranged in the cylinder sleeve and is positioned between the upper through hole and the breathing hole; the middle of the piston is provided with a piston pipe in an upward protruding manner; the piston pipe is sleeved outside the inner positioning sleeve, and the axial length of the piston pipe is smaller than that of the inner positioning sleeve; the piston pipe is positioned below the upper pressing ring; a vertical push spring is arranged between the flange and the piston;
a positioning column is arranged below the piston, and the outer diameter of the lower part of the positioning column is gradually increased from bottom to top; the lower pressing ring is provided with an upper positioning hole matched with the positioning column; the bottom wall of the cylinder sleeve is provided with a lower positioning hole corresponding to the upper positioning hole;
an inner table top is arranged in the middle of the inner wall of the cylinder sleeve, and a transverse plate is fixedly arranged on the inner table top; the transverse plate is sleeved outside the piston tube in a hollow way; a piston cavity is formed between the transverse plate and the piston; the middle part of the side wall of the cylinder sleeve is provided with a pressure guide hole; the pressure guide hole is communicated with the piston cavity;
and a guide assembly is arranged below the positioning device and fixed in the valve body.
2. A steel gate valve according to claim 1, characterized in that: the guide fork comprises a positioning piece, a pushing piece and a transverse pushing spring; the transverse push spring is arranged between the positioning sheet and the push sheet; the locating plate is fixedly connected with the flashboard.
3. A steel gate valve according to claim 2, characterized in that: the guide assembly comprises a side inlet guide sheet close to the inlet cavity and a side outlet guide sheet close to the outlet cavity; a guide gap is arranged between the inlet side guide sheet and the outlet side guide sheet, and the width of the guide gap is not less than that of the guide fork; the positioning piece is close to the inlet side guide piece; the push sheet is close to the leading-out side guide sheet; the lower end part of the positioning rod penetrates through the guide gap and is connected with the positioning sheet.
4. A steel gate valve according to claim 3, characterized in that: the number of the positioning columns is two, and the two positioning columns respectively correspond to the side inlet guide sheet and the side outlet guide sheet.
5. A steel gate valve according to claim 2, characterized in that: a plurality of lower steel coins are arranged between the lower pressing ring and the flange and are arranged on the lower pressing ring; the upper end face of the steel coin is higher than the upper end face of the lower pressing ring; the axial direction of the downward steel coin is perpendicular to the expansion direction of the lateral pushing spring.
6. A steel gate valve according to claim 2, characterized in that: a plurality of upper coins are arranged between the upper pressing ring and the cylinder cover and are arranged on the upper pressing ring; the upper end face of the upper steel coin is higher than the upper end face of the upper pressing ring; the axial direction of the steel coin is vertical to the expansion direction of the horizontal push spring.
7. A steel gate valve according to claim 1, characterized in that: the cylinder sleeve is fixedly installed on the inner wall of the valve body through a connecting bolt.
8. A steel gate valve according to claim 1, characterized in that: an outer positioning sleeve is arranged in the cylinder sleeve and is positioned on the transverse plate; the axial height of the outer positioning sleeve is equal to the distance between the transverse plate and the cylinder cover; the inner diameter of the outer positioning sleeve is larger than the outer diameter of the upper pressing ring.
9. A steel gate valve according to claim 1, characterized in that: a support is arranged on the valve cover, and a threaded sleeve is arranged at the upper end part of the support; the screw sleeve is upwards provided with an extending part; the upper part of the valve rod is in threaded connection with the threaded sleeve; and a hand wheel is arranged outside the extension part of the screw sleeve.
10. A steel gate valve according to claim 1, characterized in that: a packing structure is arranged between the valve rod and the valve cover; the packing structure comprises packing, a gland and a loose joint bolt; an inwards concave filling groove is formed in the valve cover, and the filling is filled in the filling groove; the lower part of the gland is matched with the packing groove and is used for compressing the packing in the packing groove; the gland and the valve cover are fixedly connected through a loose joint bolt.
CN202010538357.0A 2020-06-12 2020-06-12 Steel gate valve Pending CN111609164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010538357.0A CN111609164A (en) 2020-06-12 2020-06-12 Steel gate valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010538357.0A CN111609164A (en) 2020-06-12 2020-06-12 Steel gate valve

Publications (1)

Publication Number Publication Date
CN111609164A true CN111609164A (en) 2020-09-01

Family

ID=72202545

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010538357.0A Pending CN111609164A (en) 2020-06-12 2020-06-12 Steel gate valve

Country Status (1)

Country Link
CN (1) CN111609164A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100862A1 (en) * 1991-01-14 1992-07-16 Schilling H Eisenwerk Shut-off valve with bellows sealing - has two internal bellows, one softer than other, activated by shoulder on positioning rod
JP2000170954A (en) * 1998-12-07 2000-06-23 Jgc Corp Flow control system and gate valve device
CN2685672Y (en) * 2003-11-21 2005-03-16 林德宽 Gate valve with adjustable combined spool
CN101328979A (en) * 2006-10-30 2008-12-24 韦特柯格雷公司 Floating plug gate valve
CN203067812U (en) * 2013-02-04 2013-07-17 慕乃道 Sealable self-adjusting type flashboard valve
CN103307295A (en) * 2013-07-05 2013-09-18 天津百利展发集团有限公司 Low friction flat gate valve
CN203926867U (en) * 2014-06-09 2014-11-05 浙江贝托阀门有限公司 A kind of wedge-type rotary double-face forced seal gate valve
CN207584139U (en) * 2017-12-04 2018-07-06 上海冠钻精密工具有限公司 A kind of gate valve of adjustable flow and nano material making apparatus
CN207848462U (en) * 2017-12-29 2018-09-11 浙江挺宇流体设备股份有限公司 A kind of novel medium voltage parallel double-flashboard gate valve

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100862A1 (en) * 1991-01-14 1992-07-16 Schilling H Eisenwerk Shut-off valve with bellows sealing - has two internal bellows, one softer than other, activated by shoulder on positioning rod
JP2000170954A (en) * 1998-12-07 2000-06-23 Jgc Corp Flow control system and gate valve device
CN2685672Y (en) * 2003-11-21 2005-03-16 林德宽 Gate valve with adjustable combined spool
CN101328979A (en) * 2006-10-30 2008-12-24 韦特柯格雷公司 Floating plug gate valve
CN203067812U (en) * 2013-02-04 2013-07-17 慕乃道 Sealable self-adjusting type flashboard valve
CN103307295A (en) * 2013-07-05 2013-09-18 天津百利展发集团有限公司 Low friction flat gate valve
CN203926867U (en) * 2014-06-09 2014-11-05 浙江贝托阀门有限公司 A kind of wedge-type rotary double-face forced seal gate valve
CN207584139U (en) * 2017-12-04 2018-07-06 上海冠钻精密工具有限公司 A kind of gate valve of adjustable flow and nano material making apparatus
CN207848462U (en) * 2017-12-29 2018-09-11 浙江挺宇流体设备股份有限公司 A kind of novel medium voltage parallel double-flashboard gate valve

Similar Documents

Publication Publication Date Title
CN202746185U (en) Dual-guide conical valve with non-metallic seal and hydraulic cylinder body structure thereof
CN101982680B (en) Stop valve
CN202090892U (en) Cylindrical pressure return valve
CN111609164A (en) Steel gate valve
CN201057279Y (en) Sleeve regulating valve
CN115306342A (en) Glue injection guiding sealing blowout preventer
CN113217703A (en) Quick-release safety control mechanism for valve body
CN102767512B (en) A kind of two nonmetal sealing mitre velve of guidance tape and liquid cylinder structure thereof
CN220286589U (en) High-pressure diaphragm type hydraulic control valve
CN111894559B (en) Inner channel decompression restrictor
CN103603962B (en) A kind of plunger-type throttle valve
CN111609162B (en) Pipeline gate valve
CN115306340B (en) Single-cylinder four-well wellhead oil production device
RU2234595C1 (en) Borehole shutoff valve
CN206754403U (en) A kind of pilot-operated type self-locking stop valve
CN207162103U (en) A kind of bell-shaped floater type steam trap
CN106949264A (en) A kind of underground check-valves
RU93451U1 (en) DOUBLE PREVENTOR
CN201581878U (en) Cast-free dead-opening eccentric water distributor
CN202832382U (en) Safety valve of ground hydraulic control water injection well
CN201269071Y (en) Novel pressure balance control apparatus for operation under pressure
CN201190627Y (en) Water turbine with valve servo
CN105370935A (en) Y-shaped stop-check valve
CN114370258B (en) Single-valve differential pressure type drainage gas production plunger
CN119195688B (en) A leak-proof wellhead gate valve for oil mining

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200901