CN109555887B - Low flow resistance light eccentric plug valve - Google Patents
Low flow resistance light eccentric plug valve Download PDFInfo
- Publication number
- CN109555887B CN109555887B CN201910067949.6A CN201910067949A CN109555887B CN 109555887 B CN109555887 B CN 109555887B CN 201910067949 A CN201910067949 A CN 201910067949A CN 109555887 B CN109555887 B CN 109555887B
- Authority
- CN
- China
- Prior art keywords
- valve body
- valve
- wall
- reinforcing ribs
- reinforcing
- 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.)
- Active
Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 58
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims description 19
- 238000013461 design Methods 0.000 claims description 13
- 230000002787 reinforcement Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims description 4
- 239000003351 stiffener Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 210000004907 gland Anatomy 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 1
- XTKDAFGWCDAMPY-UHFFFAOYSA-N azaperone Chemical compound C1=CC(F)=CC=C1C(=O)CCCN1CCN(C=2N=CC=CC=2)CC1 XTKDAFGWCDAMPY-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013433 optimization analysis Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Check Valves (AREA)
Abstract
The utility model provides a low flow resistance light-duty eccentric plug valve, includes valve body (6), and valve gap (8) on valve body (6) are assembled through the fastener, its characterized in that: a plurality of circumferential reinforcing ribs (1) are arranged at the middle part (21) of the valve body, a plurality of radial reinforcing ribs (2) are arranged at the bottom (20) of the valve body, and a plurality of reinforcing ribs (9) are radially arranged at the inner wall (19) of the valve cover. The invention has the advantages that the structural strength meets the requirements, the valve body is more compact and the weight of the valve body is effectively reduced, the flow channel at the inlet end surface of the valve body is designed along the tangential direction of the inner wall of the valve body, and the wall thickness of the sealing end surface of the valve body and the inner wall of the valve body is subjected to gradual transition treatment so as to reduce the flow resistance of the flow channel.
Description
Technical Field
The invention relates to a plug valve mainly applied to the fields of industrial water supply, urban sewage discharge and the like, in particular to a low-flow-resistance light eccentric plug valve.
Background
The center of the valve sealing surface of the eccentric plug valve and the rotation axis of the plug are designed with an eccentric distance. By using the eccentric motion principle, the cock and the valve seat are closed and closed, and the cock and the valve seat are separated rapidly when opened. The eccentric plug valve is generally used in modern industrial production, because of longer structural size and reduced flow channel diameter, scouring corrosion in the valve body and loss of head of flowing fluid are increased, and the general wall thickness of the product designed according to the existing specification is larger, so that the whole weight of the valve is larger, and in the casting process, heat is easily generated due to the partial thickness of the valve cover and the valve body. The valve body and the valve cover have a large structure, such as that provided in patent CN 2442049U, and the flow passage is reduced in diameter and longer, resulting in an increase in flow resistance. The structure provided in patent CN 203176491U, in which a casting hole is formed in a thick and large part of the valve cover to reduce the weight of the heat section, does not optimize the structural strength of the valve cover, and cannot guarantee the structural strength when the working pressure in the plug valve is too large.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the light eccentric plug valve which is compact in structure, light in weight, low in flow resistance and optimal in working performance.
The aim of the invention can be achieved by the following technical measures:
the low flow resistance light eccentric plug valve comprises a valve body and a valve cover assembled on the valve body through a fastener; a plurality of circumferential reinforcing ribs are arranged in the middle of the valve body, a plurality of radial reinforcing ribs are arranged at the bottom of the valve body, and a plurality of reinforcing ribs are radially arranged at the inner wall of the valve cover.
In the invention, the wall thickness of the reinforced rib arranged on the inner wall of the valve cover and the wall thickness of the reinforced rib arranged on the bottom of the valve body are determined by the following formula (1):
mm； （1）
the thickness of the reinforcing ribs arranged along the radial direction at the inner wall of the valve cover and the radial reinforcing ribs at the bottom of the valve body are calculated as follows:
mm； （2）
wherein:n-number of gusset;
p-pressure or load, MPa, to which the plate is subjected;
p c -design pressure, mm;
D i -cylinder inner diameter, mm, connected to the circular plate;
D c -round flat plate calculation diameter, mm;
[σ] t -allowable stress of the flat material at the design temperature, MPa;
C-additional margin, mm;
d 1 ，d 2 -the dimensions of the reinforcing rib plate panel theoretical schematic, mm;
δ b -the valve body or valve cover after the reinforcement is designed with a wall thickness of mm;
δthe design thickness of the valve body or the valve cover reinforcing rib plate is mm;
the wall thickness of the middle part of the valve body in the inventionδ e The calculation formula (3) is as follows:
mm； （3）
circumferential reinforcing rib height at middle part of valve bodyh e The calculation formula (4) is as follows:
mm； （4）
wall thickness b of circumferential reinforcing rib at middle part of valve body e The calculation formula (5) is as follows:
mm； （5）
wherein:A s ’ the area of the valve body with the reinforcing function is mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
；
L s -spacing of adjacent reinforcing rings, mm; the calculation formula is as follows:
；
D i —the inner diameter of the cylinder body at the middle part of the valve body is mm;
L-valve body height, mm;
E-modulus of elasticity, MPa, of the valve body material;
p-the pressure or load borne by the cylindrical side wall of the valve body, MPa;
D 0 -the outer diameter of the cylinder in the middle of the valve body, mm;
the wall thickness of the valve body at the sealing end face side and the wall surface of the valve body is continuously gradually increased; at the inlet end face of the valve, the inlet direction of the flow channel is processed along the tangential direction of the inner wall of the valve body.
The beneficial effects of the invention are as follows:
1. the wall thickness and the structure of the valve body and the valve cover are treated by the reinforcing rib plates under the condition of the prior art, and the weight of the valve cover of the valve body of the traditional plug valve is reduced by about 20 percent under the condition that the structural strength of the valve body and the valve cover is not reduced.
2. The flow channel direction at the inlet end face of the valve body is along the tangential direction of the inner wall of the valve body, and the sealing end face of the valve body and the inner wall of the valve body are subjected to transition treatment, so that the flowing state of fluid flowing through the valve body is stable, and the impact corrosion is reduced.
3. The valve body has compact structure and short surface distance, shortens the residence time of the fluid in the flow channel, improves the flow velocity of the fluid and reduces the precipitation of impurities.
4. Under the technical improvement, the valve cover and the valve body are prevented from generating heat joints due to partial thickness in the casting process, casting defects such as shrinkage porosity and the like are prevented, the production difficulty is reduced, and the rate of cost is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The labels and corresponding names in fig. 1 are as follows: the valve is characterized in that (1) the valve body is provided with a circumferential reinforcing rib in the middle part, (2) the radial reinforcing rib at the bottom of the valve body, (3) the lower shaft sleeve, (4) the lower sand-proof shaft seal, (5) the valve core, (6) the valve body and (7) the valve bodyOThe type ring (8) is a valve cover, (9) is a reinforcing rib plate radially arranged on the inner wall of the valve cover, (10) is an upper sand-proof shaft seal, (11) is an upper shaft sleeve, (12) is a sealing assembly, (13) is a packing gland, (14) is a fastening bolt assembly, (15) is a driver bracket, (16) is a bolt and nut assembly, (17) is a hexagon bolt, and (18) is a hexagon fastening bolt.
Fig. 2 is a schematic diagram of a radial reinforcing rib plate structure of the inner wall of the valve cover.
The labels and corresponding names in fig. 2 are: and (9) is a reinforcing rib plate radially arranged on the inner wall of the valve cover.
Fig. 3 is a cross-sectional view of a valve cover cross-section.
The labels and corresponding names in fig. 3 are: (19) is the inner wall of the valve cover.
Fig. 4 is a schematic view of the radial reinforcement of the bottom of the valve body and the circumferential reinforcement of the middle of the valve body.
The labels and corresponding names in fig. 4 are: (1) Is a circumferential reinforcing rib in the middle of the valve body, (2) is a radial reinforcing rib at the bottom of the valve body, (20) is the bottom of the valve body, and (21) is the middle of the valve body.
Fig. 5 is a theoretical schematic diagram of a radial reinforcing plate at the bottom of the valve body.
FIG. 6 is a schematic view of the inlet flow channel guide at the inlet end face of the valve body, the transition treatment between the inner wall of the valve body and the sealing end face of the valve body, and the circumferential reinforcing ribs in the middle of the valve body.
The labels and corresponding names in fig. 6 are: (23) The valve body sealing end face side and the valve body flow passage transition wall face, and the valve body flow passage inlet end face (22).
FIG. 7 is a graphical representation of a finite element strength verification analysis stress distribution diagram of a theoretical design of a valve body and a valve cover in a specific example of the invention.
FIG. 8 is a graph of stress linearization profile of a valve body and cover strength verification analysis in accordance with an embodiment of the invention.
Detailed Description
The invention will be further described with reference to the following examples (drawings):
as shown in fig. 1, the low flow resistance light eccentric plug valve of the present invention comprises a valve body 6, a valve cap 8 assembled on the valve body 6 through a hexagonal fastening bolt 18, a valve core 5 and the valve body 6, and a joint of the valve cap 8 at a lower shaft sleeve 3, a lower sand-proof shaft seal 4 and an upper shaft sleeve 11, an upper sand-proof shaft seal 10, and a sealing assembly 12, respectively,OThe valve core 5 can do circumferential motion around the axis through the common assembly of the shaped ring 7, and the working state is realized through the cooperation with the sealing surface of the valve body.
The invention is provided with a plurality of radial reinforcing ribs 2 at the bottom 20 of the valve body, the inner wall 19 of the valve cover is provided with a plurality of reinforcing ribs 9 along the radial direction, and a plurality of circumferential reinforcing ribs 1 are arranged at the middle 21 of the valve body.
According to the invention, the flow resistance of the valve body runner inlet and the valve body inner wall is optimized, and the intensity analysis verification is carried out through finite element analysis software; namely, the wall thickness at the sealing end face side of the valve body and the valve body wall surface 23 is continuously gradually increased; at the inlet end face 22 of the valve, the flow channel inlet direction is processed along the tangential direction of the valve body inner wall.
Fig. 2 and 3 show that a plurality of reinforcing ribs 9 are radially and uniformly distributed at the inner wall 19 of the valve cover, fig. 4 and 5 show that a plurality of radial reinforcing ribs 2 are uniformly distributed at the bottom 20 of the valve body, and the wall thickness of the reinforcing ribs at the inner wall 19 of the valve cover and the reinforcing ribs at the bottom 20 of the valve body is determined by the following formula (1):
mm； （1）
as shown in fig. 5, the calculation formula (2) of the thickness of the reinforcing rib 9 radially arranged at the inner wall 19 of the valve cover and the radial reinforcing rib 2 at the bottom 20 of the valve body is as follows:
mm； （2）
wherein:n-number of gusset;
p-pressure or load, MPa, to which the plate is subjected;
p c -design pressure, mm;
D i -cylinder inner diameter, mm, connected to the circular plate;
D c -round flat plate calculation diameter, mm;
[σ] t -allowable stress of the flat material at the design temperature, MPa;
C-additional margin, mm;
d 1 ，d 2 -the dimensions of the reinforcing rib plate panel theoretical schematic, mm;
δ b -the valve body or valve cover after the reinforcement is designed with a wall thickness of mm;
δthe design thickness of the reinforcing rib plate at the valve body or the valve cover is mm;
as shown in fig. 1 and 4, the circumferential reinforcing ribs 1 are arranged in the valve body middle part 21, and the wall thickness is required at the valve body middle part 21δ e The calculation formula (3) is as follows:
mm； （3）
the height of the circumferential reinforcing rib (1) at the middle part (21) of the valve bodyh e The calculation formula (4) is as follows:
mm； （4）
wall thickness of circumferential reinforcing rib (1) at middle part (21) of valve bodyb e The calculation formula (5) is as follows:
mm； （5）
wherein:A s ’ the area of the valve body with the reinforcing function is mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
；
L s -spacing of adjacent reinforcing rings, mm; the calculation formula is as follows:
；
D i —the inner diameter of the cylinder body at the middle part of the valve body is mm;
L-valve body height, mm;
L S -adjacent circumferential reinforcement ring spacing, mm;
D 0 -the outer diameter of the cylinder in the middle of the valve body, mm;
p-the pressure or load borne by the cylindrical side wall of the valve body, MPa;
E-modulus of elasticity, MPa, of the valve body material;
as shown in fig. 6, the wall thickness at the valve body sealing end face side and the valve body wall surface 23 is designed as a continuously increasing transition treatment; at the inlet end face 22 of the valve, the flow channel inlet direction is processed along the tangential direction of the valve body inner wall.
The light eccentric plug valve of the invention performs optimization analysis on the valve cover and valve body structure after theoretical design by a finite element method, and accords with relevant design specifications at home and abroad.
The three-dimensional simplified assembly model of the valve cover, the valve body, the packing gland and the driver bracket is imported into finite element analysis software ANSYS and is divided into grids;
the static elasticity attribute module defines Young's elastic modulus of 1.73e5 MPa and Poisson's ratio of 0.3;
applying complete fixing constraint on the flange joint of the rotary plug valve assembly body and applying a positive uniform hydraulic test load of 2.4MPa on the inner wall of the valve cover and the valve body;
performing stress linearization analysis on stress distribution obtained by software, and performing security evaluation on an analysis result according to a stress linearization analysis criterion;
the following specifically describes the valve body and cover optimization process in connection with DN150 low flow resistance light eccentric plug valve examples related to the invention;
the invention relates to design pressure of PN16DN150 low flow resistance and light eccentric plug valveP C =1.6MPa， [σ] 65℃ =80MPa，d 2 =60mm，Dc=260mm，D i =224mm，n=4, valve cover designedd 21 =90 mm, valve bodyd 22 =60 mm; the saidd 1 =92.78 mm；
Due to said d 1 Are all larger than the designed valve coverd 21 And the designed valve body dimensionsd 22 The plate size of the valve cover is:
=11.56 mm; round intoδ b1 =12mm；
The required panel size of valve body:
=11.56 mm; round intoδ b2 =12mm；
Thickness of the reinforcing plate of the valve body:
mm; rounding to 10mm;
wall thickness after strengthening of valve body middle part circumference reinforcement:
height of reinforcing rib circumferentially arranged in middle of valve body:
minimum thickness of reinforcing rib circumferentially added at middle part of valve body:
the three-dimensional assembly body model of the valve cover, the valve body, the packing gland and the driver support is imported into finite element analysis software ANSYS and is divided into grids, young's elastic modulus is defined at an attribute module to be 1.73e5 MPa, poisson's ratio is 0.3, full fixing constraint is applied to a flange connection part of the plug valve assembly body, positive uniform hydraulic test load is applied to the valve body and the inner wall of the valve cover to be 2.44MPa, the stress distribution obtained by the software is shown in figure 7, the maximum stress is located at the connection part of the central protruding part of the bottom of the valve body and the radial reinforcement, and the minimum stress is located at the outer edge of the valve cover;
the stress linearization analysis is performed according to the stress distribution and the analysis result is shown in fig. 8, and according to the stress linearization analysis criterion shown in the following formula,σ m andσ l and (b)σ m +σ l The structural use requirements of the valve body, the valve cover and the like are met, and the structural strength of the valve cover and the valve body is safe.
Or->
Or->
Or->；
In the aboveσ m -one overall film stress;σ 1 -one local film stress;σ b -primary bending stress;Q-secondary stress;S-material allowable stress.
Claims (3)
1. The utility model provides a low flow resistance light-duty eccentric plug valve, includes valve body (6), and valve gap (8) on valve body (6) are assembled through the fastener, its characterized in that: a plurality of circumferential reinforcing ribs (1) are arranged at the middle part (21) of the valve body, a plurality of radial reinforcing ribs (2) are arranged at the bottom (20) of the valve body, and a plurality of reinforcing ribs (9) are radially arranged at the inner wall (19) of the valve cover; the wall thickness of the reinforcing rib arranged on the inner wall (19) of the valve cover and the wall thickness of the reinforcing rib arranged on the bottom (20) of the valve body are determined by the following formula (1):
the thickness of the reinforcing ribs (9) arranged in the radial direction at the inner wall (19) of the valve cover and the thickness of the radial reinforcing ribs (2) at the bottom (20) of the valve body are calculated as follows:
wherein: n is the number of rib plates;
the pressure or load born by the p-plate is MPa;
p c -design pressure, mm;
D i -cylinder inner diameter, mm, connected to the circular plate;
D c -round flat plate calculation diameter, mm;
[σ] t -allowable stress of the flat material at the design temperature, MPa;
c, adding allowance, mm;
d 1 -the dimensions of the theoretical schematic representation of the stiffener plate, i.e. the calculated diameter D of the circular plate c The diameter of the inscribed circle of the intrados of the circle and the adjacent two reinforcing ribs is mm;
d 2 the dimension of the reinforcing rib plate theoretical schematic diagram, namely the diameter of an inner circle surrounded by the inner ends of a plurality of reinforcing ribs arranged along the radial direction, is mm;
δ b -the valve body or valve cover after the reinforcement is designed with a wall thickness of mm;
delta-design thickness of valve body or valve cover reinforcing plate, mm;
wall thickness delta at middle part (21) of valve body e The calculation formula (3) is as follows:
the height h of the circumferential reinforcing rib (1) at the middle part (21) of the valve body e The calculation formula (4) is as follows:
wall thickness b of circumferential reinforcing rib (1) at middle part (21) of valve body e The calculation formula (5) is as follows:
wherein: a is that s ’ The area of the valve body with the reinforcing function is mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is as follows:
L s -spacing of adjacent reinforcing rings, mm; the calculation formula is as follows:
D i -inner diameter of the cylinder in the middle of the valve body, mm;
l is the height of the valve body, mm;
e, elastic modulus of valve body material, MPa;
p-pressure or load borne by the cylindrical side wall of the valve body, MPa;
D 0 -diameter of the middle cylinder of the valve body, mm.
2. The low flow resistance lightweight eccentric plug valve of claim 1, wherein: the wall thickness at the sealing end face side of the valve body and the wall surface (23) of the valve body is continuously gradually increased.
3. The low flow resistance lightweight eccentric plug valve of claim 1, wherein: at the inlet end face (22) of the valve, the inlet direction of the flow channel is processed along the tangential direction of the inner wall of the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910067949.6A CN109555887B (en) | 2019-01-24 | 2019-01-24 | Low flow resistance light eccentric plug valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910067949.6A CN109555887B (en) | 2019-01-24 | 2019-01-24 | Low flow resistance light eccentric plug valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109555887A CN109555887A (en) | 2019-04-02 |
| CN109555887B true CN109555887B (en) | 2024-02-09 |
Family
ID=65873484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910067949.6A Active CN109555887B (en) | 2019-01-24 | 2019-01-24 | Low flow resistance light eccentric plug valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109555887B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0972436A (en) * | 1995-09-05 | 1997-03-18 | Hitachi Valve Kk | Eccentric rotary valve |
| CN204187030U (en) * | 2014-09-18 | 2015-03-04 | 自贡工业阀门制造有限公司 | A kind of stopcock |
| CN108286614A (en) * | 2018-03-08 | 2018-07-17 | 河南省高山阀门有限公司 | A kind of low flow resistance long-life elastic packing eccentric stopcock |
| CN108612862A (en) * | 2018-07-19 | 2018-10-02 | 开维喜阀门集团有限公司 | It is a kind of can on-line maintenance eccentric half-ball valve |
| CN209688202U (en) * | 2019-01-24 | 2019-11-26 | 河南省高山阀门有限公司 | A kind of low flow resistance light weight eccentric plug valve |
-
2019
- 2019-01-24 CN CN201910067949.6A patent/CN109555887B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0972436A (en) * | 1995-09-05 | 1997-03-18 | Hitachi Valve Kk | Eccentric rotary valve |
| CN204187030U (en) * | 2014-09-18 | 2015-03-04 | 自贡工业阀门制造有限公司 | A kind of stopcock |
| CN108286614A (en) * | 2018-03-08 | 2018-07-17 | 河南省高山阀门有限公司 | A kind of low flow resistance long-life elastic packing eccentric stopcock |
| CN108612862A (en) * | 2018-07-19 | 2018-10-02 | 开维喜阀门集团有限公司 | It is a kind of can on-line maintenance eccentric half-ball valve |
| CN209688202U (en) * | 2019-01-24 | 2019-11-26 | 河南省高山阀门有限公司 | A kind of low flow resistance light weight eccentric plug valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109555887A (en) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103982442A (en) | Silicon carbide ceramic lined desulphurization pump | |
| CN109555887B (en) | Low flow resistance light eccentric plug valve | |
| CN206617699U (en) | A kind of pressure testing device | |
| CN201495560U (en) | Plastic inspection chamber | |
| CN206072601U (en) | Wedge compression self-energized seal flange | |
| CN209688202U (en) | A kind of low flow resistance light weight eccentric plug valve | |
| CN206398122U (en) | A kind of new multistage noise reduction V-type ball valve | |
| CN205714591U (en) | A kind of non-maintaining coupling arrangement of large-scale wind driven generator pylon | |
| CN204338573U (en) | A kind of Combined vertical roll | |
| CN103672012B (en) | Disjunctor loose-joint ball valve water segregator | |
| CN206495757U (en) | Pneumatic opposite acting ram pump | |
| CN204213359U (en) | With the easy replacing fluorine butterfly valve of gas-filled type lining | |
| CN210344513U (en) | Multistage dislocation throttling arrangement of reassembling type | |
| CN206309969U (en) | A kind of ceramic double plunger angle valve | |
| CN207569407U (en) | Lightweight band neck flange made of composite material disk | |
| CN207701850U (en) | High pressure sealing type valve seat type axis flow check valve | |
| CN2924240Y (en) | Spherical compensator sealing structure | |
| CN216519664U (en) | Pollution discharge regulating valve | |
| CN210700637U (en) | Inflatable flotation device is with scalable pipeline structure that gives ore deposit | |
| CN201373155Y (en) | Valve core base of mixed-water water tap | |
| CN206072556U (en) | A kind of new anti-cavitation resistance regulation AND DEWATERING FOR ORIFICE STRUCTURE | |
| CN111606537A (en) | High-efficient anaerobic fermentation jar airtight formula end support agitating unit | |
| CN222223015U (en) | Cement pipe forming die | |
| CN110142930A (en) | A kind of mold and integrally formed impeller of efficient integrated injection molding impeller | |
| CN2040209U (en) | Rapidly-disassembled fastening device |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |