CN112113008B - Double-plate butterfly check valve - Google Patents

Double-plate butterfly check valve Download PDF

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Publication number
CN112113008B
CN112113008B CN202011007926.5A CN202011007926A CN112113008B CN 112113008 B CN112113008 B CN 112113008B CN 202011007926 A CN202011007926 A CN 202011007926A CN 112113008 B CN112113008 B CN 112113008B
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CN
China
Prior art keywords
valve
shaft
rotating shaft
convex ring
valve clack
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Active
Application number
CN202011007926.5A
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Chinese (zh)
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CN112113008A (en
Inventor
苏凤霞
刘天昌
王月慧
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Shenzhen Jingdi Information Technology Co ltd
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Shenzhen Jingdi Information Technology Co ltd
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Priority to CN202011007926.5A priority Critical patent/CN112113008B/en
Publication of CN112113008A publication Critical patent/CN112113008A/en
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Publication of CN112113008B publication Critical patent/CN112113008B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/223—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves with a plurality of valve 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/224—Details of bearings for the axis of rotation
    • F16K1/225—Details of bearings for the axis of rotation the axis of rotation having only one bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise

Abstract

The invention discloses a double-plate butterfly check valve, which comprises a valve body, wherein a valve cavity and a valve hole communicated with the valve cavity are arranged in the valve body, the valve hole is divided into a left valve hole and a right valve hole by a partition plate, a rotating shaft parallel to the partition plate is arranged at the position, close to the partition plate, of the valve cavity, a right valve clack is arranged on the rotating shaft, a shaft sleeve is rotatably connected to the rotating shaft, and a left valve clack is arranged on the shaft sleeve; the rotating shaft is sleeved with a torsional spring; a sliding rod is arranged in the valve cavity along the axial direction of the rotating shaft, the rotating shaft is connected with a pressing plate in a sliding mode at a position close to the lower end of the rotating shaft, and the pressing plate is connected to the sliding rod in a sliding mode; a third spring is sleeved on the rotating shaft and the sliding rod in the valve cavity, a first transmission assembly connected with the pressing plate is arranged on the shaft sleeve, and a second transmission assembly connected with the pressing plate is arranged on the rotating shaft; the double-plate butterfly check valve is reasonable in structure, reliable in use, and capable of being opened quickly, closed slowly and prevented from impact.

Description

Double-plate butterfly check valve
Technical Field
The invention belongs to the technical field of pipeline valves, and particularly relates to a double-plate butterfly check valve.
Background
The butterfly check valve is a valve that automatically opens and closes a valve plate depending on the flow of a medium itself to prevent the backflow of the medium, and is also called a check valve, a back-flow valve, and a back-pressure valve. The check valve is an automatic valve, and mainly has the functions of preventing media from flowing backwards, preventing the pump and the driving motor from reversing and discharging the media of a container. The butterfly check valve may also be used to provide make-up to auxiliary systems where the pressure may rise above the system pressure. Butterfly check valves can be divided into two main categories: one is a double plate type, and the other is a single plate type.
The double-plate butterfly check valve has the working characteristics of large load change, small opening and closing frequency, long application period once the double-plate butterfly check valve is put into a closed or opened state, and no movement of a moving part is required. Because the medium flows in the direction at the closing moment of the double-plate butterfly check valve, the medium is rapidly reduced to zero from the maximum backflow speed along with the closing of the valve plate, and the pressure is rapidly increased, namely, a water hammer phenomenon which can damage a pipeline system is generated. For a high-pressure pipeline system applicable to parallel connection of a plurality of pumps, the water hammer problem of the double-plate butterfly check valve is more prominent. The water hammer is a kind of pressure wave in the instantaneous flow in the pressure pipeline, and is a hydraulic impact phenomenon that the pressure rises or falls due to the change of the flow velocity of the fluid in the pressure pipeline. The physical reasons for this are the combined effect of the fluid's incompressibility, the inertia of fluid movement and the elasticity of the pipe. The water hammer phenomenon is objectively existed in a pipeline for transporting liquid, and the destructiveness of the water hammer phenomenon is large, so that the pressure intensity in the pipeline is uneven, the pipe is broken or collapsed, and the valve clack and a fixing piece are also destroyed; and because the closing speed is too fast when the check valve clack is closed, the valve clack collides with the valve seat, so that the sealing surface of the valve seat is easily damaged by collision, and the sealing performance of the check valve is reduced.
Disclosure of Invention
The invention aims to provide a double-plate butterfly check valve which is reasonable in structure and reliable in use, and the left valve clack and the right valve clack can be opened quickly, closed slowly and prevented from impact.
In order to achieve the purpose, the invention provides the following technical scheme:
a double-plate butterfly check valve comprises a valve body, wherein a valve cavity and a valve hole communicated with the valve cavity are arranged in the valve body, the valve hole is divided into a left valve hole and a right valve hole by a partition plate, a rotating shaft parallel to the partition plate is arranged at a position, close to the partition plate, of the valve cavity, a right valve clack used for controlling the on-off of the right valve hole is arranged on the rotating shaft, a shaft sleeve is rotatably connected on the rotating shaft, and a left valve clack used for controlling the on-off of the left valve hole is arranged on the shaft sleeve; the rotating shaft is sleeved with a torsion spring which is used for forcing the left valve clack to close the left valve hole and forcing the right valve clack to close the right valve hole; a sliding rod is arranged in the valve cavity along the axial direction of the rotating shaft, the rotating shaft is connected with a pressing plate in a sliding mode at a position close to the lower end of the rotating shaft, and the pressing plate is connected to the sliding rod in a sliding mode; a third spring for forcing the pressing plate to move upwards is sleeved on the rotating shaft and the sliding rod in the valve cavity, a first transmission assembly connected with the pressing plate is arranged on the shaft sleeve, a second transmission assembly connected with the pressing plate is arranged on the rotating shaft, and the first transmission assembly and the second transmission assembly control the pressing plate to be in an initial position in the process that the left valve clack and the right valve clack are completely closed to be completely opened; and in the process of completely opening the left valve clack and the right valve clack to close, the first transmission assembly and the second transmission assembly control pressure plate compress the third spring, and when the left valve clack and the right valve clack are completely closed, the first transmission assembly and the second transmission assembly control pressure plate return to the initial position.
Furthermore, a semicircular convex ring is arranged on the outer side of the rotating shaft on the pressing plate, a first spiral convex ring and a second spiral convex ring are symmetrically arranged on the semicircular convex ring, a first annular groove is formed in the position, close to the upper end of the semicircular convex ring, of the inner side wall of the first spiral convex ring, and a second annular groove is formed in the position, close to the upper end of the semicircular convex ring, of the inner side wall of the second spiral convex ring; the first transmission assembly comprises a first convex shaft, a first mounting groove is formed in the outer side of the shaft sleeve along the radial direction, the first convex shaft is located in the first mounting groove, and a first spring used for forcing the first convex shaft to extend out of the first mounting groove is arranged in the first mounting groove; the second transmission assembly comprises a second convex shaft, a second mounting groove is formed in the outer side of the rotating shaft along the radial direction, the second convex shaft is located in the second mounting groove, and a second spring used for forcing the second convex shaft to extend out of the second mounting groove is arranged in the second mounting groove; in the process that the left valve clack and the right valve clack are completely closed to be completely opened, the first convex shaft slides to a position between the first spiral convex ring and the second spiral convex ring from the upper end of the semicircular convex ring through the first annular groove, and the second convex shaft slides to a position between the first spiral convex ring and the second spiral convex ring from the upper end of the semicircular convex ring through the second annular groove; in the process that the left valve clack and the right valve clack are completely opened to closed, the first convex shaft pushes the pressing plate to move downwards along the first spiral convex ring, the second convex shaft pushes the pressing plate to move downwards along the second spiral convex ring, and when the left valve clack and the right valve clack are completely closed, the first convex shaft and the second convex shaft both move to the semicircular convex ring.
Furthermore, a third annular groove is formed in the shaft sleeve, and the second protruding shaft is located in the third annular groove.
Furthermore, a spring hole is formed in the valve cavity at the position of the sliding rod and the rotating shaft, and the lower end of the third spring abuts against the bottom of the spring hole.
Furthermore, be equipped with left sealing washer on the valve clack of a left side, all be equipped with right sealing washer on the valve clack of the right side.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the left valve clack and the right valve clack are slowed down by the pressure plate and the third spring when being closed, so that the water hammer phenomenon can be relieved, and the force of closing the left valve clack and the right valve clack can be reduced, so that the valve clack and the valve seat are protected;
2. make left valve clack and right valve clack not receive the effort of buffering third spring when opening through using first annular and second annular groove structure, can not influence opening of left valve clack and right valve clack like this, when left valve clack and right valve clack are closed through first protruding axle and first spiral bulge loop to and the cooperation of second protruding axle and second spiral bulge loop, can receive the resistance of third spring when making left valve clack and right valve clack move and use, close and cushion left valve clack and right valve clack.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIGS. 4-5 are block diagrams of the platens;
FIG. 6 is a front view of the platen;
FIG. 7 is a left side view of the platen;
FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7;
FIG. 9 is a cross-sectional view in the direction C-C of the check valve of FIG. 1 when closed;
fig. 10 is a cross-sectional view in the direction C-C of the check valve of fig. 1 when fully opened.
Detailed Description
Referring to fig. 1-10, a double-plate butterfly check valve includes a valve body 1, a valve cavity 1a and a valve hole communicated with the valve cavity 1a are provided in the valve body 1, the valve hole is divided into a left valve hole 1b and a right valve hole 1c by a partition plate 1d, a rotating shaft 4 parallel to the partition plate 1d is provided at a position close to the partition plate 1d in the valve cavity 1a, a right valve flap 2b for controlling the on-off of the right valve hole 1c is provided on the rotating shaft 4, the rotating shaft 4 is rotatably connected with a shaft sleeve 5, and a left valve flap 2a for controlling the on-off of the left valve hole 1b is provided on the shaft sleeve 5; the rotating shaft 4 is sleeved with a torsion spring 3, and the torsion spring 3 is used for forcing the left valve clack 2a to close the left valve hole 1b and forcing the right valve clack 2b to close the right valve hole 1 c; a sliding rod 11 is arranged in the valve cavity 1a along the axial direction of the rotating shaft 4, a pressing plate 9 is connected to the position, close to the lower end, of the rotating shaft 4 in a sliding mode, and the pressing plate 9 is connected to the sliding rod 11 in a sliding mode; a third spring 10a for forcing the pressing plate 9 to move upwards is sleeved on the rotating shaft 4 and the sliding rod 11 in the valve cavity 1a, a first transmission assembly connected with the pressing plate 9 is arranged on the shaft sleeve 5, a second transmission assembly connected with the pressing plate 9 is arranged on the rotating shaft 4, and the first transmission assembly and the second transmission assembly control the pressing plate 9 to be in an initial position in the process that the left valve clack 2a and the right valve clack 2b are completely closed to be completely opened; the first and second transmission assembly control pressure plates 9 compress the third springs 10a during the process of the left and right valve flaps 2a and 2b from being fully opened to being closed, and the first and second transmission assembly control pressure plates 9 are reset to the initial position when the left and right valve flaps 2a and 2b are fully closed.
A semicircular convex ring 9c is arranged on the outer side of the rotating shaft 4 on the pressing plate 9, a first spiral convex ring 9d and a second spiral convex ring 9b are symmetrically arranged on the semicircular convex ring 9c, a first annular groove 9e is formed in the position, close to the upper end of the semicircular convex ring 9c, of the inner side wall of the first spiral convex ring 9d, and a second annular groove 9a is formed in the position, close to the upper end of the semicircular convex ring 9c, of the inner side wall of the second spiral convex ring 9 b; the first transmission assembly comprises a first protruding shaft 6, a first mounting groove 51 is formed in the outer side of the shaft sleeve 5 along the radial direction, the first protruding shaft 6 is located in the first mounting groove 51, and a first spring 8a for forcing the first protruding shaft 6 to extend out of the first mounting groove 51 is arranged in the first mounting groove 51; the second transmission assembly comprises a second protruding shaft 7, a second mounting groove 41 is arranged on the outer side of the rotating shaft 4 along the radial direction, the second protruding shaft 7 is positioned in the second mounting groove 41, and a second spring 8b for forcing the second protruding shaft 7 to extend out of the second mounting groove 41 is arranged in the second mounting groove 41; in the process of completely closing the left valve clack 2a and the right valve clack 2b to completely opening the left valve clack, the first convex shaft 6 slides between the first spiral convex ring 9d and the second spiral convex ring 9b from the upper end of the semicircular convex ring 9c through the first annular groove 9e, and the second convex shaft 7 slides between the first spiral convex ring 9d and the second spiral convex ring 9b from the upper end of the semicircular convex ring 9c through the second annular groove 9 a; during the process of completely opening the left valve clack 2a and the right valve clack 2b to close, the first convex shaft 6 pushes the pressing plate 9 to move downwards along the first spiral convex ring 9d, the second convex shaft 7 pushes the pressing plate 9 to move downwards along the second spiral convex ring 9b, and when the left valve clack 2a and the right valve clack 2b are completely closed, the first convex shaft 6 and the second convex shaft 7 both move onto the semicircular convex ring 9 c.
The shaft sleeve 5 is provided with a third annular groove 5a, and the second protruding shaft 7 is located in the third annular groove 5 a. The valve cavity 1a is internally provided with a spring hole 1f at the sliding rod 11 and the rotating shaft 4, and the lower end of the third spring 10a is abutted against the bottom of the spring hole 1 f. And a left sealing ring 2c is arranged on the left valve clack 2a, and a right sealing ring 2d is arranged on the right valve clack 2 b.
When the check valve needs to be opened in a pipeline, a medium pushes the left valve clack 2a to open the left valve hole 1b, the right valve clack 2b opens the right valve hole 1c, then the rotating shaft 4 and the shaft sleeve 5 rotate along with the rotation, the shaft sleeve 5 drives the first convex shaft 6 to rotate anticlockwise, the rotating shaft 4 drives the second convex shaft 7 to rotate clockwise (as shown in figures 9 and 10), the first convex shaft 6 enters the first annular groove 9e when the first convex shaft 6 rotates, the second convex shaft 7 enters the second annular groove 9a when the second convex shaft 7 rotates, the torsion spring 3 is compressed along with the rotation of the left valve clack 2a and the right valve clack 2b, the first convex shaft 6 and the second convex shaft 7 move towards the center until the left valve clack 2a and the right valve clack 2b are completely opened, the first convex shaft 6 extends between the first spiral convex ring 9d and the second spiral convex ring 9b under the action of the first spring 8a, the second convex shaft 7 extends between the first spiral convex ring 9d and the second spiral convex ring 9b under the action of the second spring 8b, this time as shown in fig. 10. When a medium in a pipeline flows reversely, the left valve clack 2a and the right valve clack 2b are pushed to rotate, when the check valve is closed, the first convex shaft 6 rotates to be matched with the spiral surface of the first spiral convex ring 9d, meanwhile, the second convex shaft 7 rotates to be matched with the spiral surface of the second spiral convex ring 9b, the pressure plate 9 is pushed to overcome the two third springs 10a to push the pressure plate 9 to move downwards, the rotating left valve clack 2a and the rotating right valve clack 2b are buffered, the closing speed is slowed down, and therefore collision between the valve clacks and the valve seat can be relieved, and the water hammer phenomenon is relieved; when the left valve clack 2a and the right valve clack 2b are completely closed, the first convex shaft 6 is separated from the spiral surface of the first spiral convex ring 9d and is pressed on the upper end of the semicircular convex ring 9c under the action of the first spring 8a, and the second convex shaft 7 is separated from the spiral surface of the second spiral convex ring 9b and is pressed on the upper end of the semicircular convex ring 9c under the action of the second spring 8b, and the positions are restored to the positions shown in fig. 2, so that circulation is formed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (4)

1. A double-plate butterfly check valve comprises a valve body, wherein a valve cavity and a valve hole communicated with the valve cavity are arranged in the valve body, the valve hole is divided into a left valve hole and a right valve hole by a partition plate, a rotating shaft parallel to the partition plate is arranged at a position, close to the partition plate, of the valve cavity, a right valve clack used for controlling the on-off of the right valve hole is arranged on the rotating shaft, a shaft sleeve is rotatably connected on the rotating shaft, and a left valve clack used for controlling the on-off of the left valve hole is arranged on the shaft sleeve; the rotating shaft is sleeved with a torsion spring which is used for forcing the left valve clack to close the left valve hole and forcing the right valve clack to close the right valve hole; the valve is characterized in that a sliding rod is arranged in the valve cavity along the axial direction of a rotating shaft, the rotating shaft is connected with a pressing plate in a sliding mode at a position close to the lower end of the rotating shaft, and the pressing plate is connected to the sliding rod in a sliding mode; a third spring for forcing the pressing plate to move upwards is sleeved on the rotating shaft and the sliding rod in the valve cavity, a first transmission assembly connected with the pressing plate is arranged on the shaft sleeve, a second transmission assembly connected with the pressing plate is arranged on the rotating shaft, and the first transmission assembly and the second transmission assembly control the pressing plate to be in an initial position in the process that the left valve clack and the right valve clack are completely closed to be completely opened; in the process that the left valve clack and the right valve clack are completely opened to closed, the first transmission assembly and the second transmission assembly control pressure plate compress the third spring, and when the left valve clack and the right valve clack are completely closed, the first transmission assembly and the second transmission assembly control pressure plate to reset to the initial position;
a semicircular convex ring is arranged on the outer side of the rotating shaft on the pressing plate, a first spiral convex ring and a second spiral convex ring are symmetrically arranged on the semicircular convex ring, a first annular groove is formed in the position, close to the upper end of the semicircular convex ring, of the inner side wall of the first spiral convex ring, and a second annular groove is formed in the position, close to the upper end of the semicircular convex ring, of the inner side wall of the second spiral convex ring; the first transmission assembly comprises a first convex shaft, a first mounting groove is formed in the outer side of the shaft sleeve along the radial direction, the first convex shaft is located in the first mounting groove, and a first spring used for forcing the first convex shaft to extend out of the first mounting groove is arranged in the first mounting groove; the second transmission assembly comprises a second convex shaft, a second mounting groove is formed in the outer side of the rotating shaft along the radial direction, the second convex shaft is located in the second mounting groove, and a second spring used for forcing the second convex shaft to extend out of the second mounting groove is arranged in the second mounting groove; in the process that the left valve clack and the right valve clack are completely closed to be completely opened, the first convex shaft slides to a position between the first spiral convex ring and the second spiral convex ring from the upper end of the semicircular convex ring through the first annular groove, and the second convex shaft slides to a position between the first spiral convex ring and the second spiral convex ring from the upper end of the semicircular convex ring through the second annular groove; in the process that the left valve clack and the right valve clack are completely opened to closed, the first convex shaft pushes the pressing plate to move downwards along the first spiral convex ring, the second convex shaft pushes the pressing plate to move downwards along the second spiral convex ring, and when the left valve clack and the right valve clack are completely closed, the first convex shaft and the second convex shaft both move to the semicircular convex ring.
2. The dual plate butterfly check valve of claim 1 wherein said sleeve has a third annular groove therein, said second protruding shaft being positioned in said third annular groove.
3. The double-plate butterfly check valve of claim 1, wherein a spring hole is formed in the valve cavity at the sliding rod and the rotating shaft, and a lower end of the third spring abuts against a bottom of the spring hole.
4. The dual plate butterfly check valve of claim 1, wherein a left seal ring is disposed on the left flap and a right seal ring is disposed on the right flap.
CN202011007926.5A 2020-09-23 2020-09-23 Double-plate butterfly check valve Active CN112113008B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011007926.5A CN112113008B (en) 2020-09-23 2020-09-23 Double-plate butterfly check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011007926.5A CN112113008B (en) 2020-09-23 2020-09-23 Double-plate butterfly check valve

Publications (2)

Publication Number Publication Date
CN112113008A CN112113008A (en) 2020-12-22
CN112113008B true CN112113008B (en) 2022-05-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1076671A (en) * 1965-04-26 1967-07-19 Teddington Aircraft Controls L Improvements in non-return valves
JPH10281314A (en) * 1997-04-08 1998-10-23 Tomoe Gijutsu Kenkyusho:Kk Dual plate check valve
CN204756032U (en) * 2015-05-08 2015-11-11 上海沪航阀门有限公司 Butt clamp butterfly check valve
CN207921410U (en) * 2018-02-27 2018-09-28 温州威蓝阀门有限公司 A kind of check-valves that fastness is high
CN111677919A (en) * 2020-06-19 2020-09-18 黄洪刚 Butterfly check valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1076671A (en) * 1965-04-26 1967-07-19 Teddington Aircraft Controls L Improvements in non-return valves
JPH10281314A (en) * 1997-04-08 1998-10-23 Tomoe Gijutsu Kenkyusho:Kk Dual plate check valve
CN204756032U (en) * 2015-05-08 2015-11-11 上海沪航阀门有限公司 Butt clamp butterfly check valve
CN207921410U (en) * 2018-02-27 2018-09-28 温州威蓝阀门有限公司 A kind of check-valves that fastness is high
CN111677919A (en) * 2020-06-19 2020-09-18 黄洪刚 Butterfly check valve

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