CN115247714A - Buffering type long-service-life high-cleanness diaphragm valve - Google Patents

Buffering type long-service-life high-cleanness diaphragm valve Download PDF

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Publication number
CN115247714A
CN115247714A CN202210948458.4A CN202210948458A CN115247714A CN 115247714 A CN115247714 A CN 115247714A CN 202210948458 A CN202210948458 A CN 202210948458A CN 115247714 A CN115247714 A CN 115247714A
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CN
China
Prior art keywords
valve
diaphragm
valve body
sets
piece
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
CN202210948458.4A
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Chinese (zh)
Inventor
方贤乐
方凤竹
林莲平
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.)
Teflon Group Co ltd
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Teflon Group 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 Teflon Group Co ltd filed Critical Teflon Group Co ltd
Priority to CN202210948458.4A priority Critical patent/CN115247714A/en
Publication of CN115247714A publication Critical patent/CN115247714A/en
Pending legal-status Critical Current

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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
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • 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
    • 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
    • F16K15/14—Check valves with flexible valve members
    • F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery
    • 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
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0236—Diaphragm cut-off apparatus
    • 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
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • 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
    • F16K31/60—Handles

Abstract

The invention discloses a buffer type long-life high-cleanness diaphragm valve, which comprises: a valve body; the valve cover is fixedly arranged on the valve body through a fixing bolt and is communicated with the inside of the valve body; the valve rod is arranged inside the valve body and the valve cover; the valve comprises a valve rod, a valve clack, a floating nut, a connecting rod and a pressing sheet, wherein the valve clack is arranged at one end of the valve rod, a cavity is formed in the valve clack, one end of the valve rod is located in the cavity, the floating nut is arranged in the cavity of the valve clack, the lower end of the floating nut is provided with the connecting rod, and the pressing sheet is integrally formed at one end of the connecting rod; the pressing piece is connected with the split diaphragm. The invention can freely adjust the thrust nut, thereby controlling the stroke of the valve rod, limiting the thrust of the valve seat and preventing the additional damage of the membrane caused by misoperation.

Description

Buffering type long-service-life high-cleanness diaphragm valve
Technical Field
The invention belongs to the technical field of diaphragm valves, and particularly relates to a buffer type long-life high-cleanness diaphragm valve.
Background
The diaphragm valve is a stop valve which uses a diaphragm as an opening and closing piece to close a flow passage, cut off fluid and separate an inner cavity of a valve body from an inner cavity of a valve cover. The diaphragm valve is a special type of cut-off valve, and its opening and closing member is a diaphragm made of soft material, and can separate the inner cavity of valve body from the inner cavity of valve cover and driving component, so that it is called diaphragm valve. The most prominent characteristic is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the parts such as the valve rod and the like above the diaphragm are not corroded by the medium, the packing sealing structure is omitted, and the medium is not leaked.
The diaphragm and the valve clack of the existing diaphragm valve are mostly directly connected, no buffer mechanism is arranged, so that when the valve is closed, loads directly reach the valve clack and the diaphragm, the loads are distributed unevenly, the diaphragm is damaged easily, the service life of the whole diaphragm valve is shortened, and the buffer type long-life high-cleanness diaphragm valve is provided for solving the problems existing in the prior art.
Disclosure of Invention
The invention aims to provide a buffer type long-life high-cleanness diaphragm valve to solve the problems that load distribution is not uniform, a diaphragm is easy to damage and the service life of the whole diaphragm valve is shortened in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
high clean diaphragm valve of buffering formula long-life includes:
a valve body;
the valve cover is fixedly arranged on the valve body through a fixing bolt and is communicated with the interior of the valve body;
the valve rod is arranged inside the valve body and the valve cover;
the valve comprises a valve rod, a valve clack, a floating nut, a connecting rod and a pressing sheet, wherein the valve clack is arranged at one end of the valve rod, a cavity is formed in the valve clack, one end of the valve rod is located in the cavity, the floating nut is arranged in the cavity of the valve clack, the lower end of the floating nut is provided with the connecting rod, and the pressing sheet is integrally formed at one end of the connecting rod;
the pressing piece is connected with the split diaphragm.
Preferably, the split diaphragm includes:
the end parts of the upper EPDM sheet and the lower PFA sheet are fixedly connected;
a hollow convex block is arranged at the upper end of the lower PFA piece and at the central position of the lower PFA piece, the pressing piece is positioned inside the hollow convex block, and an annular sealing ring is arranged at the lower end of the lower PFA piece;
the lower surface of the upper EPDM sheet is provided with a clamping groove matched with the hollow bump, and a gap is formed between the upper EPDM sheet and the lower PFA sheet.
Preferably, the diaphragm valve further comprises:
the hand wheel, the upper end of valve rod is provided with the screw thread post, be provided with thrust nut on the screw thread post, the hand wheel cover is located on the thrust nut.
Preferably, the diaphragm valve further comprises:
and the combining cap is sleeved on the threaded column, and one end of the threaded column penetrates through the combining cap and is positioned outside the combining cap.
Preferably, the diaphragm valve further comprises:
the filter structure is positioned at the water inlet of the valve body, and the backwater prevention component is positioned at the water outlet of the valve body;
the filter structure includes:
the annular limiting block is arranged at the water inlet of the valve body and is integrally formed with the valve body;
the outer walls of the two groups of fixing rings are provided with elastic rubber rings, and the elastic rubber rings are attached to the inner wall of the water inlet of the valve body;
install two sets of cylindrical filter screen between the solid fixed ring, cylindrical filter screen sets up the closed cylindrical filter screen of one end opening other end, cylindrical filter screen open-ended one end is relative with the rivers direction.
Preferably, the backwater prevention assembly includes:
two groups of arc-shaped mounting blocks fixed on the inner wall of the water outlet of the valve body;
be fixed in two sets ofly respectively two sets of elastic rubber piece on the arc installation piece, it is two sets of elastic rubber piece's tip sets up to half-circular arc, and two sets of elastic rubber piece's tip is inconsistent.
Preferably, be provided with a plurality of groups of fixed plates on the cylindrical filter screen, the draw-in groove has been seted up on the fixed plate, and is two sets of all be provided with the joint subassembly on solid fixed ring's the inner wall, the inside of the draw-in groove that the joint subassembly card was located.
Preferably, the water inlet and the water outlet of the valve body are both provided with a connecting flange plate, and the connecting flange plate is provided with a plurality of groups of connecting holes in an annular array.
Preferably, the clamping assembly includes:
the steel ball is attached to one side of the sliding block, one side of the sliding block is fixedly connected to one end of the compression spring, the two groups of baffles are arranged, and the sliding block and the compression spring are located between the two groups of baffles.
The invention has the technical effects and advantages that: compared with the prior art, the buffer type diaphragm valve with long service life and high cleanness provided by the invention has the following advantages:
the thrust nut can be freely adjusted, so that the stroke of the valve rod is controlled, the thrust of the valve seat is limited, and the additional damage to the diaphragm caused by misoperation is prevented;
according to the buffer type floating connection design, the floating nut with the pressing block is used as the intermediate connecting piece of the diaphragm and the valve clack, when the valve is closed, the load is firstly transferred to the floating nut and then transferred to the diaphragm through the valve clack, so that the load is uniformly distributed to the diaphragm, the stress of the diaphragm is more uniform, and the service life of the diaphragm is prolonged; when the valve rod is quickly closed, in order to prevent the diaphragm from being impacted at a high speed, the buffer type floating connection can enable the load to be uniformly increased, the pre-placed diaphragm floating nut can effectively reduce the stress at the connection part of the diaphragm bolt, so that the diaphragm bolt cannot fall off or be punctured, meanwhile, the diaphragm is stressed more uniformly, and the service life of the diaphragm is prolonged;
the invention adopts the combined design of the split upper EPDM sheet and the lower PFA sheet, under the condition of continuously changing temperature, the two materials keep respective contraction ratio and expansion coefficient, still keep the dimensional stability, have higher fatigue resistance under reverse bending pressure, and improve the service life of the diaphragm;
the invention adopts the annular sealing ring for sealing, better limits the space area of the medium cavity and avoids the residue of the medium in the sealing gap which is difficult to clean.
Drawings
FIG. 1 is a schematic view of a buffer type long-life high-cleanness diaphragm valve according to the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the construction of the valve flap of the present invention;
FIG. 4 is a schematic structural view of a filter structure according to the present invention;
FIG. 5 is a schematic view of a latch assembly of the present invention.
In the figure: 1. a valve body; 2. a valve cover; 3. a valve stem; 6. a valve clack; 7. a floating nut; 8. a connecting rod; 9. tabletting; 10. a split diaphragm; 11. an upper EPDM sheet; 12. a PFA sheet is arranged; 13. a hollow bump; 14. a hand wheel; 15. a threaded post; 16. a thrust nut; 17. and capping; 18. a filter structure; 19. a backwater prevention component; 20. an annular seal ring; 21. an annular stop block; 22. a fixing ring; 23. an elastic rubber ring; 24. a cylindrical screen; 25. an arc-shaped mounting block; 26. an elastic rubber sheet; 27. a fixing plate; 28. a card slot; 29. a clamping assembly; 30. connecting a flange plate; 31. connecting holes; 32. steel balls; 33. a slider; 34. a compression spring; 35. and a baffle plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides the structure shown in FIGS. 1-5
High clean diaphragm valve of buffering formula long-life includes:
the water inlet and the water outlet of the valve body 1 are both provided with a connecting flange 30, and a plurality of groups of connecting holes 31 are arranged on the connecting flange 30 in an annular array;
the valve cover 2 is fixedly arranged on the valve body 1 through a fixing bolt, and the valve cover 2 is communicated with the interior of the valve body 1;
the valve rod 3 is arranged inside the valve body 1 and the valve cover 2;
the valve comprises a valve clack 6 arranged at one end of a valve rod 3, wherein a cavity is arranged in the valve clack 6, one end of the valve rod 3 is positioned in the cavity, a floating nut 7 is arranged in the cavity of the valve clack 6, a connecting rod 8 is arranged at the lower end of the floating nut 7, and a pressing sheet 9 is integrally formed at one end of the connecting rod 8;
set up at the inside components of a whole that can function independently diaphragm 10 of valve body 1, preforming 9 is connected with components of a whole that can function independently diaphragm 10, and components of a whole that can function independently diaphragm 10 includes:
the end parts of the upper EPDM sheet 11 and the lower PFA sheet 12 are connected and fixed;
a hollow convex block 13 is arranged at the upper end of the lower PFA piece 12 and at the central position of the lower PFA piece 12, the pressing piece 9 is positioned inside the hollow convex block 13, an annular sealing ring 20 is arranged at the lower end of the lower PFA piece 12, the annular sealing ring 20 is used for sealing, the space area of a medium cavity is better limited, and the medium is prevented from remaining in a sealing gap which is difficult to clean;
the lower surface of the upper EPDM sheet 11 is provided with a clamping groove matched with the hollow bump 13, a gap is arranged between the upper EPDM sheet 11 and the lower PFA sheet 12, the split type upper EPDM sheet 11 and the split type lower PFA sheet 12 combined design is adopted, under the condition of continuous temperature change, the two materials keep respective contraction ratio and expansion coefficient, the size stability is still kept, the anti-fatigue strength is higher under reverse bending pressure, and the service life of the diaphragm is prolonged.
In the buffer type floating connection design, a floating nut with a press block is adopted as an intermediate connecting piece between the split diaphragm 10 and the valve clack 6, when the valve is closed, the load is firstly transferred to the floating nut and then transferred to the split diaphragm 10 by the valve clack 6, so that the load is uniformly distributed to the split diaphragm 10, the stress of the split diaphragm 10 is more uniform, and the service life of the split diaphragm 10 is prolonged; and when the valve rod 3 is closed quickly, in order to prevent the split diaphragm 10 from being impacted at high speed, the buffer type floating connection can enable the load to be increased uniformly, the split diaphragm 10 and the floating nut 7 which are placed in advance can effectively reduce the stress at the bolt connection part of the split diaphragm 10, so that the bolts of the split diaphragm 10 cannot fall off or puncture, meanwhile, the stress of the split diaphragm 10 is more uniform, and the service life of the split diaphragm 10 is prolonged.
Further, the diaphragm valve further includes:
the upper end of the valve rod 3 is provided with a threaded column 15, the threaded column 15 is provided with a thrust nut 16, and the hand wheel 14 is sleeved on the thrust nut 16; the thrust nut 16 can be freely adjusted, so that the stroke of the valve rod 3 is controlled, the thrust of the valve seat is limited, and the additional damage to the split diaphragm 10 caused by misoperation is prevented;
further comprising:
the combining cap 17, the combining cap 17 is sleeved on the threaded column 15, and one end of the threaded column 15 penetrates through the combining cap 17 and is positioned outside the combining cap 17;
further comprising:
a filtering structure 18 positioned at the water inlet of the valve body 1 and a backwater prevention component 19 positioned at the water outlet of the valve body 1;
the filter structure 18 includes:
an annular limiting block 21 which is arranged at the water inlet of the valve body 1 and is integrally formed with the valve body 1;
the outer walls of the two groups of fixing rings 22 are provided with elastic rubber rings 23, and the elastic rubber rings 23 are attached to the inner wall of the water inlet of the valve body 1;
the cylindrical filter screen 24 is arranged between the two groups of fixing rings 22, the cylindrical filter screen 24 is provided with a cylindrical filter screen with one open end and the other closed end, the open end of the cylindrical filter screen 24 is opposite to the water flow direction, the cylindrical filter screen 24 is provided with a plurality of groups of fixing plates 27, the fixing plates 27 are provided with clamping grooves 28, the inner walls of the two groups of fixing rings 22 are provided with clamping components 29, and the clamping components 29 are clamped in the clamping grooves 28;
the clip assembly 29 includes:
the steel ball 32 is attached to one side of the sliding block 33, one side of the sliding block 33 is fixedly connected to one end of the compression spring 34, two groups of baffles 35 are arranged, and the sliding block 33 and the compression spring 34 are located between the two groups of baffles 35.
It is worth mentioning that the backwater prevention assembly 19 includes:
two groups of arc-shaped mounting blocks 25 fixed on the inner wall of the water outlet of the valve body 1;
two sets of elastic rubber pieces 26 fixed on the two sets of arc-shaped mounting blocks 25 respectively, the end parts of the two sets of elastic rubber pieces 26 are arranged to be semi-arc-shaped, and the end parts of the two sets of elastic rubber pieces 26 are mutually inconsistent.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (9)

1. High clean diaphragm valve of buffering formula long-life, its characterized in that includes:
a valve body (1);
the valve cover (2) is fixedly arranged on the valve body (1) through a fixing bolt, and the valve cover (2) is communicated with the interior of the valve body (1);
the valve rod (3) is arranged inside the valve body (1) and the valve cover (2);
the valve clack (6) is arranged at one end of the valve rod (3), a cavity is arranged in the valve clack (6), one end of the valve rod (3) is located in the cavity, a floating nut (7) is arranged in the cavity of the valve clack (6), a connecting rod (8) is arranged at the lower end of the floating nut (7), and a pressing sheet (9) is integrally formed at one end of the connecting rod (8);
the pressing piece is characterized by comprising a split diaphragm (10) arranged inside the valve body (1), and the pressing piece (9) is connected with the split diaphragm (10).
2. The buffered long life high cleanliness diaphragm valve of claim 1, wherein: the split diaphragm (10) includes:
the EPDM comprises an upper EPDM sheet (11) and a lower PFA sheet (12), wherein the end parts of the upper EPDM sheet (11) and the lower PFA sheet (12) are fixedly connected;
a hollow bump (13) is arranged at the upper end of the lower PFA piece (12) and at the center of the lower PFA piece (12), the pressing piece (9) is arranged inside the hollow bump (13), and an annular sealing ring (20) is arranged at the lower end of the lower PFA piece (12);
the lower surface of the upper EPDM sheet (11) is provided with a clamping groove matched with the hollow bump (13), and a gap is formed between the upper EPDM sheet (11) and the lower PFA sheet (12).
3. The buffered long life high clean diaphragm valve of claim 1, wherein: the diaphragm valve further includes:
the valve rod structure comprises a hand wheel (14), a threaded column (15) is arranged at the upper end of the valve rod (3), a thrust nut (16) is arranged on the threaded column (15), and the thrust nut (16) is sleeved with the hand wheel (14).
4. The buffered long life high clean diaphragm valve of claim 1, wherein: the diaphragm valve further includes:
and the combining cap (17) is sleeved on the threaded column (15), and one end of the threaded column (15) penetrates through the combining cap (17) and is positioned outside the combining cap (17).
5. The buffered long life high clean diaphragm valve of claim 1, wherein: the diaphragm valve further includes:
the filter structure (18) is positioned at the water inlet of the valve body (1), and the backwater prevention component (19) is positioned at the water outlet of the valve body (1);
the filtering structure (18) comprises:
an annular limiting block (21) which is arranged at the water inlet of the valve body (1) and is integrally formed with the valve body (1);
the outer walls of the two groups of fixing rings (22) are provided with elastic rubber rings (23), and the elastic rubber rings (23) are attached to the inner wall of the water inlet of the valve body (1);
install two sets of cylindrical filter screen (24) between solid fixed ring (22), cylindrical filter screen (24) set up the closed cylindrical filter screen of one end opening other end, cylindrical filter screen (24) open-ended one end is relative with the rivers direction.
6. The buffered long life high clean diaphragm valve of claim 5, wherein: the backwater prevention assembly (19) includes:
two groups of arc-shaped mounting blocks (25) fixed on the inner wall of the water outlet of the valve body (1);
be fixed in two sets ofly respectively two sets of elastic rubber piece (26) on arc installation piece (25), two sets of the tip of elastic rubber piece (26) sets up to half-circular arc, and two sets of the tip of elastic rubber piece (26) is inconsistent.
7. The buffered long life high clean diaphragm valve of claim 5, wherein: be provided with a plurality of groups fixed plate (27) on cylindrical filter screen (24), draw-in groove (28) have been seted up on fixed plate (27), and are two sets of all be provided with joint subassembly (29) on the inner wall of solid fixed ring (22), the inside of draw-in groove (28) that joint subassembly (29) card was located.
8. The buffered long life high clean diaphragm valve of claim 1, wherein: the water inlet and the water outlet of the valve body (1) are respectively provided with a connecting flange plate (30), and the connecting flange plates (30) are provided with a plurality of groups of connecting holes (31) in an annular array.
9. The buffered long life high clean diaphragm valve of claim 7, wherein: the clamping assembly (29) comprises:
steel ball (32), sliding block (33), compression spring (34) and baffle (35), steel ball (32) laminate in one side of sliding block (33), one side fixed connection in compression spring (34) of sliding block (33) one end, baffle (35) are provided with two sets ofly, sliding block (33) and compression spring (34) all are located between two sets of baffles (35).
CN202210948458.4A 2022-08-09 2022-08-09 Buffering type long-service-life high-cleanness diaphragm valve Pending CN115247714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210948458.4A CN115247714A (en) 2022-08-09 2022-08-09 Buffering type long-service-life high-cleanness diaphragm valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210948458.4A CN115247714A (en) 2022-08-09 2022-08-09 Buffering type long-service-life high-cleanness diaphragm valve

Publications (1)

Publication Number Publication Date
CN115247714A true CN115247714A (en) 2022-10-28

Family

ID=83699412

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210948458.4A Pending CN115247714A (en) 2022-08-09 2022-08-09 Buffering type long-service-life high-cleanness diaphragm valve

Country Status (1)

Country Link
CN (1) CN115247714A (en)

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