CN114962663A - Method for preventing rotation of flap valve from being blocked - Google Patents

Method for preventing rotation of flap valve from being blocked Download PDF

Info

Publication number
CN114962663A
CN114962663A CN202210505087.2A CN202210505087A CN114962663A CN 114962663 A CN114962663 A CN 114962663A CN 202210505087 A CN202210505087 A CN 202210505087A CN 114962663 A CN114962663 A CN 114962663A
Authority
CN
China
Prior art keywords
valve
valve body
plate
avoiding
rod
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
CN202210505087.2A
Other languages
Chinese (zh)
Inventor
赵树起
范亚荣
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.)
Tianjin Qichang Valve Manufacture Co ltd
Original Assignee
Tianjin Qichang Valve Manufacture Co ltd
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 Tianjin Qichang Valve Manufacture Co ltd filed Critical Tianjin Qichang Valve Manufacture Co ltd
Priority to CN202210505087.2A priority Critical patent/CN114962663A/en
Publication of CN114962663A publication Critical patent/CN114962663A/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
    • 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
    • F16K1/226—Shaping or arrangements of the sealing
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/46—Mechanical actuating means for remote operation

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a method for preventing a flap valve from being blocked in rotation, which comprises a valve body, an automatic control assembly and a sediment filtering assembly, wherein a driving box is installed at the top of the valve body, the automatic control assembly is installed inside the driving box, the sediment filtering assembly which is symmetrically arranged with respect to the driving box is installed inside the valve body, a U-shaped valve plate is arranged inside the valve body, a valve rod penetrates through the U-shaped valve plate, the top of the valve rod penetrates through the top of the valve body, the automatic control assembly comprises a top plate, a motor base, a driving motor, a screw and a turbine, the top plate is installed at the top of the driving box, and the motor base is installed at the top of the top plate. Need not the switching of manual control valve body, can realize the switching of remote control valve body with the help of remote control equipment control driving motor, can filter the silt in the fluid, avoid silt to cause U type valve plate acutely to abrade and reduce the leakproofness of valve body, be convenient for regularly clear up filterable silt.

Description

Method for preventing rotation of flap valve from being blocked
Technical Field
The invention relates to the technical field of butterfly valves, in particular to a method for preventing a flap valve from being blocked in rotation.
Background
The butterfly valve is also called a flap valve, is a regulating valve with simple structure, and can be used for the switch control of low-pressure pipeline media. Can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metal, radioactive media and the like. The pipe mainly plays a role in cutting off and throttling.
Application number CN202022254832.X discloses an electronic headless butterfly valve belongs to valve technical field, which comprises a valve body, valve body right side outer wall is seted up flutedly, recess bottom surface inner wall is pegged graft there is the one end of valve rod, just the other end of valve rod extends to the valve opening inside and valve plate outer fixed surface is connected, valve body internally mounted has the motor, motor bottom surface inner wall sliding connection has the one end of rotation axis. According to the invention, the vertical rod and the valve rod can be detached by rotating the bolt, the vertical rod can vertically move upwards along the clamping groove by tightly holding the handle, the baffle can be separated from the valve body and the gear B to be separated from the gear A, then the vertical rod and the valve rod can be detachably connected by rotating the bolt along the insertion hole, and the valve plate can be driven to rotate under the action of the vertical rod and the valve rod by tightly holding the handle, so that the on-off of the valve hole can be regulated and controlled, the electric butterfly valve can be manually used when an accident happens, and is suitable for being widely popularized and used.
The electric headless butterfly valve of the above technology has the following disadvantages: because there can be material such as silt in the fluid, so pile up silt easily in the valve plate position to make the rotation of valve plate obstructed, make the butterfly valve take place to block up after long-term the use easily, not only can influence the permeability of butterfly valve like this, cause the butterfly valve can not open and close, can reduce the life of butterfly valve in addition.
To this end, we propose a method to avoid the rotation of the flap valve from being blocked.
Disclosure of Invention
The invention mainly aims to provide a method for preventing a flap valve from being blocked in rotation, which can effectively solve the problems in the background art.
In order to realize the purpose, the invention adopts the technical scheme that:
a method for avoiding rotation blocking of a flap valve comprises a valve body, an automatic control assembly and a sediment filtering assembly, wherein a driving box is installed at the top of the valve body, the automatic control assembly is installed inside the driving box and used for remotely controlling the opening and closing of a headless butterfly valve, a valve rod does not need to be manually rotated to control the opening and closing of the headless butterfly valve, the sediment filtering assembly is installed inside the valve body and symmetrically arranged relative to the driving box, the sediment filtering assembly is used for intercepting sediment entering the headless butterfly valve in a pipeline and avoiding the sediment from being accumulated at a U-shaped valve plate, and the U-shaped valve plate is seriously abraded to influence the opening and closing effect of the U-shaped valve plate for a long time;
the inside of valve body is provided with U type valve plate, the valve rod is worn to be equipped with in the inside of U type valve plate, the top of valve body is run through at the top of valve rod, and the area of contact of U type valve plate ratio traditional circular valve plate and valve body is littleer, consequently receives the leakproofness influence of contact site less to improve the leakproofness of headless butterfly valve.
Further, the automatic control subassembly includes roof, motor cabinet, driving motor, screw rod and turbine, the top at the drive case is installed to the roof, the motor cabinet is installed at the top of roof, install driving motor in the motor cabinet, driving motor's output shaft tip passes through the end connection of belt with the screw rod, the periphery meshing of screw rod is connected with the turbine, the periphery at the valve rod is installed to the turbine, and driving motor's output shaft drives the screw rod and rotates, and the screw rod makes the turbine drive the valve rod and rotates to through the switching of U type valve plate control valve body, the switching that can remote control driving motor's start control valve body.
Further, silt filtering component is including sealed shell, handle, end block, sealed cassette, inner ring and filter screen, the periphery at the valve body is laminated to the sealed shell, sealed cassette is installed to the interior week of sealed shell, the inner ring is installed to the interior week of sealed cassette, the filter screen is installed to the interior week of inner ring, the both ends of sealed shell all are connected with end block through integrated into one piece, end block passes through bolt and valve body fixed connection, the handle is installed at the top of sealed shell, and silt flows into the valve internal back, receives the interception of filter screen, and silt piles up the surface at the filter screen, regularly takes off the bolt on the end block, can lift silt filtering component on the whole and clear up the silt on the filter screen, avoids silt to pile up the velocity of liquid flow that influences in the valve body.
Further, the angle positioning dish that is located the turbine below is installed to the periphery of valve rod, the angle sensor who is located the drive incasement side is installed at the top of valve body, angle sensor sets up in the below of angle positioning dish, and angle sensor can discern the angle marking line on the angle positioning dish to confirm the turned angle of valve rod and U type valve plate.
Furthermore, spacing is installed to the inner wall of drive case, spacing passes through the bearing frame and is connected with the screw rod rotation, and stability when spacing is used for improving the valve rod rotation.
Furthermore, the two ends of the valve body are connected with flange plates through integrated forming, circular through holes distributed in an annular array are formed in the peripheries of the flange plates, and the valve body and the pipeline are connected and fixed conveniently through the flange plates.
Compared with the prior art, the invention has the following beneficial effects: through the arranged automatic control assembly, the valve body is not required to be manually controlled to be opened and closed, and the valve body can be remotely controlled to be opened and closed by controlling the work of the driving motor through remote control equipment; through the silt filtering component who sets up, can filter the silt in the fluid, avoid silt to cause the violent wearing and tearing of U type valve plate and lead to the leakproofness of valve body to reduce, silt filtering component easy to assemble and dismantlement are convenient for regularly clear up filterable silt simultaneously.
Drawings
Fig. 1 is a schematic overall structure diagram of a method for preventing rotation of a flap valve from being blocked according to the invention.
Fig. 2 is a cross-sectional view of a method of preventing rotation of a flap valve from being hindered according to the present invention.
Fig. 3 is an enlarged view of a structure at a in fig. 2 of a method for preventing rotation of the flap valve from being hindered according to the present invention.
In the figure: 1. a valve body; 2. sealing the shell; 3. a handle; 4. an end-block; 5. sealing the card seat; 6. an inner ring; 7. a filter screen; 8. a drive box; 9. a top plate; 10. a motor base; 11. a drive motor; 12. a limiting strip; 13. a screw; 14. a valve stem; 15. a U-shaped valve plate; 16. an angle positioning plate; 17. an angle sensor; 18. a turbine; 19. a flange plate.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-3, a method for preventing rotation of a flap valve from being blocked includes a valve body 1, an automatic control assembly and a sediment filter assembly, wherein a driving box 8 is installed at the top of the valve body 1, the automatic control assembly is installed inside the driving box 8, the automatic control assembly is used for remotely controlling the open and close of a headless butterfly valve, the open and close of the headless butterfly valve are controlled without manually rotating a valve rod 14, the sediment filter assembly is installed inside the valve body 1 and symmetrically arranged with respect to the driving box 8, and the sediment filter assembly is used for intercepting sediment entering the headless butterfly valve in a pipeline and preventing the sediment from accumulating at a U-shaped valve plate 15, so that the open and close effects of the U-shaped valve plate 15 are influenced due to serious abrasion of the U-shaped valve plate 15 in the past for a long time;
the inside of valve body 1 is provided with U type valve plate 15, valve rod 14 is worn to be equipped with in the inside of U type valve plate 15, the top of valve body 1 is run through at the top of valve rod 14, and U type valve plate 15 is littleer than traditional circular valve plate and the area of contact of valve body 1, consequently receives the leakproofness influence of contact site less to improve headless butterfly valve's leakproofness.
Further, the automatic control assembly comprises a top plate 9, a motor base 10, a driving motor 11, a screw 13 and a turbine 18, the top plate 9 is installed at the top of the driving box 8, the motor base 10 is installed at the top of the top plate 9, the driving motor 11 is installed in the motor base 10, the end part of an output shaft of the driving motor 11 is connected with the end part of the screw 13 through a belt, the turbine 18 is connected with the periphery of the screw 13 in a meshed mode, the turbine 18 is installed at the periphery of the valve rod 14, the output shaft of the driving motor 11 drives the screw 13 to rotate, the screw 13 enables the turbine 18 to drive the valve rod 14 to rotate, and therefore the opening and closing of the valve body 1 can be controlled through the U-shaped valve plate 15, and the opening and closing of the valve body 1 can be controlled through the starting of the driving motor 11.
Wherein, silt filtering component includes sealed shell 2, handle 3, end block 4, sealed cassette 5, inner ring 6 and filter screen 7, the periphery at valve body 1 of laminating of sealed shell 2, sealed cassette 5 is installed to the interior week of sealed shell 2, inner ring 6 is installed to the interior week of sealed cassette 5, filter screen 7 is installed to the interior week of inner ring 6, the both ends of sealed shell 2 all are connected with end block 4 through integrated into one piece, end block 4 passes through bolt and 1 fixed connection of valve body, handle 3 is installed at the top of sealed shell 2, and silt flows into valve body 1 interior back, receives the interception of filter screen 7, and silt is piled up on the surface of filter screen 7, regularly takes off the bolt on end block 4, can wholly lift silt filtering component and clear up the silt on filter screen 7, avoids silt to pile up the velocity of liquid flow that influences in the valve body 1.
Wherein, the angle positioning disk 16 that is located turbine 18 below is installed to the periphery of valve rod 14, the angle sensor 17 that is located the drive box 8 inboard is installed at the top of valve body 1, angle sensor 17 sets up the below at angle positioning disk 16, and angle sensor 17 can discern the angle mark line on the angle positioning disk 16 to confirm the turned angle of valve rod 14 and U type valve plate 15.
Wherein, spacing strip 12 is installed to the inner wall of drive box 8, spacing strip 12 rotates through bearing frame and screw rod 13 to be connected, and stability when spacing strip 12 is used for improving valve rod 14 and rotates.
The two ends of the valve body 1 are connected with a flange 19 through integrated forming, circular through holes distributed in an annular array are formed in the periphery of the flange 19, and the valve body 1 is connected and fixed with a pipeline through the flange 19 conveniently.
It should be noted that the invention is a method for preventing the rotation of a flap valve from being blocked, a flange 19 is fixedly connected with a pipeline by using bolts, a remote control device is additionally arranged on a valve body 1 for controlling a circuit of a driving motor 11, when the opening and closing of the pipeline are required to be controlled, the power supply of the driving motor 11 is switched on by the remote control device, an output shaft of the driving motor 11 drives a screw 13 to rotate through a belt, the screw 13 drives a turbine 18 to rotate when rotating, so as to drive a valve rod 14 to rotate, a U-shaped valve plate 15 rotates along with the valve rod 14, so as to control the opening and closing of the valve body 1, when liquid flows through the interior of the valve body 1, silt is intercepted by a filter screen 7 and cannot penetrate through the U-shaped valve plate 15, the abrasion caused by the abrasion of the silt when the U-shaped valve plate 15 rotates is avoided, the bolt on an end block 4 is periodically detached, a handle 3 is held to lift a sealing shell 2 upwards, and a sealing clamping seat 5, an inner ring 6 and the filter screen 7 are intensively taken out, and the silt on the filter screen 7 is cleaned and then is installed and fixed.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The method for avoiding the rotation obstruction of the flap valve comprises a valve body (1) and is characterized by further comprising an automatic control assembly and a sediment filtering assembly, wherein a driving box (8) is installed at the top of the valve body (1), the automatic control assembly is installed inside the driving box (8), and the sediment filtering assembly which is symmetrically arranged relative to the driving box (8) is installed inside the valve body (1);
the valve is characterized in that a U-shaped valve plate (15) is arranged inside the valve body (1), a valve rod (14) penetrates through the U-shaped valve plate (15), and the top of the valve rod (14) penetrates through the top of the valve body (1).
2. The method for avoiding the rotation resistance of the flap valve according to claim 1, characterized in that: the automatic control assembly comprises a top plate (9), a motor base (10), a driving motor (11), a screw rod (13) and a turbine (18), the top of a driving box (8) is installed on the top plate (9), the motor base (10) is installed on the top of the top plate (9), the driving motor (11) is installed in the motor base (10), the end portion of an output shaft of the driving motor (11) is connected with the end portion of the screw rod (13) through a belt, the turbine (18) is connected with the periphery of the screw rod (13) in a meshed mode, and the periphery of the valve rod (14) is installed on the turbine (18).
3. The method for avoiding the rotation resistance of the flap valve according to claim 1, characterized in that: silt filtering component includes sealed shell (2), handle (3), end block (4), sealed cassette (5), inner ring (6) and filter screen (7), the periphery at valve body (1) is laminated in sealed shell (2), sealed cassette (5) are installed to the interior week of sealed shell (2), inner ring (6) are installed to the interior week of sealed cassette (5), filter screen (7) are installed to the interior week of inner ring (6), the both ends of sealed shell (2) all are connected with end block (4) through integrated into one piece, end block (4) pass through bolt and valve body (1) fixed connection, handle (3) are installed at the top of sealed shell (2).
4. The method for avoiding the rotation resistance of the flap valve according to claim 1, characterized in that: the angle positioning disc (16) that are located turbine (18) below is installed to the periphery of valve rod (14), angle sensor (17) that are located drive box (8) inboard are installed at the top of valve body (1), angle sensor (17) set up the below at angle positioning disc (16).
5. The method for avoiding the rotation resistance of the flap valve according to claim 1, characterized in that: spacing strip (12) are installed to the inner wall of drive box (8), spacing strip (12) are connected with screw rod (13) rotation through the bearing frame.
6. The method for avoiding the rotation resistance of the flap valve according to claim 1, characterized in that: the two ends of the valve body (1) are connected with a flange plate (19) through integral forming, and circular through holes distributed in an annular array are formed in the periphery of the flange plate (19).
CN202210505087.2A 2022-05-10 2022-05-10 Method for preventing rotation of flap valve from being blocked Pending CN114962663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210505087.2A CN114962663A (en) 2022-05-10 2022-05-10 Method for preventing rotation of flap valve from being blocked

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210505087.2A CN114962663A (en) 2022-05-10 2022-05-10 Method for preventing rotation of flap valve from being blocked

Publications (1)

Publication Number Publication Date
CN114962663A true CN114962663A (en) 2022-08-30

Family

ID=82970535

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210505087.2A Pending CN114962663A (en) 2022-05-10 2022-05-10 Method for preventing rotation of flap valve from being blocked

Country Status (1)

Country Link
CN (1) CN114962663A (en)

Similar Documents

Publication Publication Date Title
CN113280133B (en) High barrier propterty butterfly valve
CN113944762B (en) Three-eccentric bidirectional butterfly valve sealing structure
CN114962663A (en) Method for preventing rotation of flap valve from being blocked
CN215410234U (en) Silt-proof butterfly valve
CN217234431U (en) Prevent deposiing obstructed butterfly valve
CN210123019U (en) Pneumatic butterfly valve
CN212986222U (en) Sealed corrosion-resistant butterfly valve
CN113685573A (en) Liquid accumulation prevention ball valve
CN117847243B (en) Eccentric butterfly valve
CN214287206U (en) Prevent silt jam formula butterfly valve
CN210566287U (en) Prevent that valve body from blockking up electronic angle formula mud valve
CN220891219U (en) Hidden rod gate valve with filtering function
CN218118629U (en) Rotary opening and closing butterfly valve with silt prevention function
CN215763336U (en) Center line double-flange opposite clamping type butterfly valve
CN220488434U (en) Full lining rubber full lining fluorine butterfly valve
CN116146727B (en) Valve with anti-blocking function
CN219062461U (en) Electric butterfly valve
CN215487677U (en) Large flow stop valve
CN220488454U (en) Groove soft sealing hidden rod gate valve
CN219472781U (en) Hydraulic gate for dredging and discharging mud
CN214367828U (en) Track type hard sealing butterfly valve
CN221033994U (en) Dual-channel butterfly valve
CN220488308U (en) Butterfly valve with self-locking function for nuclear power
CN201108773Y (en) Filtering element end cap capable of closing oil inlet valve automatically
CN214404720U (en) Novel energy-saving wafer butterfly valve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication