CN104405894A - Valve and valve core dismounting method - Google Patents
Valve and valve core dismounting method Download PDFInfo
- Publication number
- CN104405894A CN104405894A CN201410706957.8A CN201410706957A CN104405894A CN 104405894 A CN104405894 A CN 104405894A CN 201410706957 A CN201410706957 A CN 201410706957A CN 104405894 A CN104405894 A CN 104405894A
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- valve
- screw rod
- rod
- valve body
- screw
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000008676 import Effects 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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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
- 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
- F16K1/02—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 screw-spindle
- F16K1/04—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 screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
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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
- 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
- F16K1/38—Valve members of conical shape
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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
- 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
- F16K1/48—Attaching valve members to screw-spindles
- F16K1/487—Attaching valve members to screw-spindles by a fixing element extending in the axial direction of the spindle, e.g. a screw
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
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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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Abstract
The invention relates to a valve and a valve core dismounting method. The valve comprises a valve body, a hand wheel, a valve rod and a valve core. A cavity is formed in the valve body, the hand wheel is disposed on the outside of the valve body, the valve core is arranged in the valve body, and the hand wheel is connected with the valve core through the valve rod. The valve core comprises a screw and a plug for plugging a valve port. The valve rod is a polished rod, and the lower portion of the valve rod penetrates a through hole and stretches into the valve body. A threaded hole is formed in the inner side of the upper end of the screw in the valve body, external threads matched with the threaded hole are arranged at the lower end of the valve rod, and the lower end of the valve rod and the upper end of the screw form a first thread fit connection. A water through plate with an internal threaded hole is arranged in the valve body, the screw and the internal threaded hole form a second thread fit connection, and the first thread fit connection is fixedly connected with the second thread fit connection. The valve is low in cost, good in seal leakage-proof effect, and the valve core can be changed conveniently when the valve is used.
Description
Technical field
The invention belongs to mechanical fitting field of components, especially relate to a kind of valve, and the method for dismounting of this valve core.
Background technique
Existing a kind of valve, as shown in Figure 1, its structure comprises valve body 10, handwheel 50, valve rod 30 and spool 20, valve body 10 is provided with import and outlet, handwheel 50 is in outside valve body, spool 20 is in valve body, valve body 10 top is a valve gap 40, valve gap 40 is fixedly installed on the spool mouth of valve body 10 by screw, valve opening in the middle part of valve gap 40, valve opening inwall is provided with screw thread, valve rod 30 is provided with the outside thread with valve opening screw-internal thread fit, the upper end of valve rod 30 is fixedly connected with handwheel 50, be threaded with valve opening in the middle part of valve gap 40 in the middle part of valve rod 30, by the adjustment of handwheel 50, realize moving up and down of spool 20.Valve gap 40 is fixed by screws on the spool mouth of valve body 10 by above-mentioned valve, and not by its integrally casting, and advantage is dismounting and to change spool more convenient.
Although above-mentioned valve structure is simple, cost is low, but in use, we find that this kind of valve also has many deficiencies, be mainly manifested in following 2 points: 1. connect when the valve gap 40 of this valve is connected employing split with valve body 10, hand over the low pig iron according to cost, not only easy getting rusty in joint and leaking, and intensity is low.2. adopt in the middle part of the valve rod 30 of this valve and with valve opening in the middle part of valve gap 40 and be threaded, this object be threaded is to impel handwheel to drive it up and down with valve opening, therefore be a mobilizable loose fit, and this cooperation also will realize sealing, it not only requires very high in precision, and in use for some time, as easy as rolling off a log wearing and tearing and leaking.In addition, this fit system, when leaking easily appears in hydraulic pressure one higher position, is difficult to meet high hydraulic pressure environment and uses.
Summary of the invention
For the deficiency that above-mentioned this kind of valve exists, it is low that technical problem to be solved by this invention is to provide a kind of cost, and sealing and anti-leakage is effective and be convenient to the valve changing spool.
On the basis of this valve, another technical problem to be solved of the present invention is the method for dismounting providing spool in a kind of valve.
For this reason, the present invention is by the following technical solutions:
A kind of valve, comprise valve body, handwheel, valve rod and spool, be provided with cavity in valve body, valve body is provided with and the import of described cavity connects and outlet, and handwheel is in outside valve body, and spool is in valve body, and handwheel connects spool by valve rod; Described body top is the valve gap roof be connected as a single entity with valve body body, and described valve gap roof is provided with the through hole for wearing valve body; Seal ring is provided with in through hole; Cavity in described valve body is divided into the epicoele that is connected with import and exports the cavity of resorption connected, and the valve interior wall bottom epicoele and between cavity of resorption is provided with the valve port that can be connected; Described spool comprises screw rod and the plug for shutoff valve port; Described valve rod is polished rod, and stem lower portion is passed described through hole and stretched into epicoele; Screw rod is provided with tapped hole inside upper end portion, and valve rod underpart is provided with the outside thread coordinated with described tapped hole, forms the first screw-thread fit and be connected between valve rod underpart with screw rod upper end portion; The water board of band interior threaded hole is provided with inside described epicoele; Form the second screw-thread fit between described screw rod with described interior threaded hole to be connected; It is can order about screw rod with the up and down loose fit of water board that described second screw-thread fit connects, and it is being fixedly connected with of tightly connecting in the second screw-thread fit that the first screw-thread fit connects; It is polygonal pulling part that described screw rod bottom is provided with cross section, during cut-off valve, and the corresponding described import in described pulling part position; Screw rod below described pulling part is removably connected with plug, and described plug is corresponding with valve port and mate.
Scheme as a further improvement on the present invention, described through-hole wall is provided with two circular grooves be arranged above and below, and described seal ring quantity is two, is contained in respectively in two described circular grooves.
As present invention further optimization scheme, described plug is the cone structure that top is large, bottom is little, and the end face of plug is provided with projection, and the lower end surface of described screw rod is provided with mounting groove, and described protruding setting-in enters described mounting groove internal fixtion.
Further, described projection is fastener, and described mounting groove is draw-in groove, and plug is by the draw-in groove clamping of the lower end of fastener and screw rod.
A spool method for dismounting for above-mentioned valve, described method for dismounting employing one is with the spanner of the spanner recess mated with described pulling part; It comprises the steps:
A. valve cuts out by rotation hand wheel, and the downward activity of screw rod makes pulling part be in bottom, and described spanner recess stretches into from import and coordinates with pulling part;
B. loaded by handwheel in the turning tool strengthening the arm of force, hold spanner control pulling part and do not rotate, continue counterrotating handwheel, screw rod is static not to rotate, and makes valve rod screw out screw rod;
C. adopt spanner to rotate pulling part again, impel described screw rod upwards movable, make the spacing between plug and valve port with dismounting plug, then dial lower end cap with spanner and take out from inlet;
D. finally adopt spanner to rotate pulling part with direction contrary in step c, impel described screw rod movable downwards, until screw rod lower end is stretched into valve port and departed from water board, split out spool.
Use invention can reach following beneficial effect: valve of the present invention still cost is low, adopts the valve of this structure, and its body top is the valve gap roof be connected as a single entity with valve body body, and valve gap roof is provided with the through hole for wearing valve body.Seal ring is provided with in through hole; And valve rod is polished rod, stem lower portion is through through hole, and polished rod and seal ring closely cooperate, not only facilitated rotate but also sealing effect relatively good.And drive especially by handwheel and with axially move up and down thus impel to be formed between plug and valve port conducting and closed be the screw rod of a connection valve rod, screw rod is in epicoele completely.So, the interior threaded hole between screw rod and water board can adopt the matching relationship of extremely pine, decreases the rotation strength of handwheel, facilitates the operation of valve.Therefore this valve can also be suitable for the environment of elevated pressures, and the flexible operation of this valve, do not rotate for a long time and not easily become dead valve yet.
Accompanying drawing explanation
Fig. 1: the cross-sectional view of prior art.
Fig. 2: the cross-sectional view of the embodiment of the present invention.
Fig. 3: when the present invention dismantles spool, the cooperating structure schematic diagram of spanner and pulling part.
Fig. 4: when the present invention dismantles spool, the structural representation that spool decomposes.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Embodiment: a kind of valve as shown in figs. 2 to 4, comprises valve body 1, handwheel 3, valve rod 20 and spool, is provided with cavity in valve body 1, valve body 1 is provided with the import 10 of described cavity connects and exports 11, handwheel 3 is in outside valve body 1, and spool is in valve body 1, and handwheel 3 connects spool by valve rod 20.Particularly:
Cavity in above-mentioned valve body 1 is divided into the epicoele 1c that is connected with import 10 and export the cavity of resorption 1d connected, and the valve interior wall bottom epicoele 1c and between cavity of resorption 1d is provided with the valve port 1e that can be connected, and blocks valve port 1e and valve is closed.Valve body 1 top is the valve gap roof be connected as a single entity with valve body 1 body, and valve gap roof is provided with the through hole 10a for wearing valve body 1; Through hole 10a inwall is provided with two circular grooves be arranged above and below, and is equipped with a seal ring 4 in each circular groove, and namely seal ring 4 is two that are arranged above and below, and is contained in respectively in two described circular grooves.Valve rod 20 is polished rods, and epicoele 1c is stretched into through through hole 10a in its underpart, and the valve rod 20 crush seal circle 4 be in through hole 10a realizes sealing.
Be provided with water board 1b inside above-mentioned epicoele 1c, this water board 1b week side is fixedly connected on epicoele 1c inwall, and interior threaded hole in the middle part of water board 1b, is provided with some inletes around middle part.Corresponding part, interior threaded hole position is directly over valve port 1e.Above-mentioned spool comprises screw rod 21 and the plug 22 for shutoff valve port 1e, and screw rod 21 lower end is connected with plug 22, and therefore plug 22 is corresponding with valve port 1e, and plug 22 is in top is large, bottom is little cone structure, underpart and valve port 1e form fit.
Above-mentioned screw rod 21 is threaded with interior threaded hole, specifically with the loose fit of activity, screw rod 21 is provided with tapped hole inside upper end portion, and valve rod 20 underpart is provided with the outside thread coordinated with described tapped hole, forms the first screw-thread fit and be connected between valve rod 20 underpart with screw rod 21 upper end portion; The water board 1b of band interior threaded hole is provided with inside epicoele 1c; Described screw rod 21 with form the second screw-thread fit between described interior threaded hole and be connected.
It is can order about screw rod 21 with the up and down loose fit of water board 1b that second screw-thread fit connects, and it is being fixedly connected with of tightly connecting in the second screw-thread fit that the first screw-thread fit connects.
It is polygonal pulling part 211 that screw rod 21 bottom is provided with cross section, during cut-off valve, and the corresponding described import 10 in described pulling part 211 position; Screw rod 21 below pulling part 211 is removably connected with plug 22, and described plug 22 is corresponding with valve port 1e and mate.
Above-mentioned plug 22 is in the cone structure that top is large, bottom is little, and the end face of plug 22 is provided with projection, and the lower end surface of described screw rod 21 is provided with mounting groove, and described protruding setting-in enters described mounting groove internal fixtion.Projection is fastener, and mounting groove is draw-in groove, and plug 22 is by the draw-in groove clamping of the lower end of fastener and screw rod 21.
Why the present invention adopts above-mentioned valve body 1 top to be the valve gap roof be connected as a single entity with valve body 1 body, reason is to allow valve body have integrity, bring compressive strength better, and not easily leak because seam crossing gets rusty, thus make MANUFACTURER that the low cast iron materials of cost can be adopted to make valve body, with the effect reduced costs.
And after adopting the valve body 1 of above-mentioned integral structure, in order to change spool, the present invention can dismantle spool in the following way.Particularly:
Spool method for dismounting in above-mentioned valve arrangement, needs to use a comparatively conventional extracting tool, and this instrument is one with the spanner 5 of spanner 5 recess mated with described pulling part 211; Its method for dismounting comprises the steps:
1. valve cuts out by rotation hand wheel 3, and screw rod 21 activity downwards makes pulling part 211 be in bottom, and described spanner 5 recess stretches into from import 10 and coordinates with pulling part 211;
2. loaded by handwheel 3 in the turning tool strengthening the arm of force, hold spanner 5 and control pulling part and do not rotate, continue counterrotating handwheel 3, screw rod 21 is static not to rotate, and makes valve rod 20 screw out screw rod 21;
3. rotate pulling part 211 at employing spanner 5, impel described screw rod 21 upwards movable, make that there is between plug 22 and valve port 1e the spacing dismantling plug 22, then take out from import 10 with spanner 5 groups of lower end caps 22;
4. the last spanner 5 that adopts rotates pulling part 211 with direction contrary in step c, impels described screw rod 21 movable downwards, until screw rod 21 lower end is stretched into valve port 1e and departed from water board 1b, splits out spool.
This spool method for dismounting is more ingenious, make use of import 10 as dismounting mouth, recycling spanner 5 also fly 3 rotates, just can split out spool smoothly through above-mentioned steps, the size of certainly above-mentioned import 10, screw rod 21, valve port 1e size and plug 22 is any designs can implemented according to those skilled in the art on the basis of said method.Adopt above-mentioned spool method for dismounting, effectively avoid design of easily leaking of the prior art, can retain again simultaneously and change spool advantage eaily.And this method for dismounting is more hidden, is applicable to professional person's dismounting, is convenient to manufacturer and prevents user from arbitrarily dismantling, make the subsequent maintenance of valve be attributed to manufacturer's care and maintenance, and there is uniformity.
More than show and describe basic principle of the present invention and major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a valve, comprise valve body (1), handwheel (3), valve rod (20) and spool, valve body is provided with cavity in (1), valve body (1) is provided with the import of described cavity connects (10) and exports (11), handwheel (3) is in valve body (1) outward, spool is in valve body (1), and handwheel (3) connects spool by valve rod (20);
It is characterized in that:
Described valve body (1) top is the valve gap roof be connected as a single entity with valve body (1) body, and described valve gap roof is provided with the through hole (10a) for wearing valve body (1); Seal ring (4) is provided with in through hole (10a); Cavity in described valve body (1) is divided into the epicoele (1c) that is connected with import (10) and exports the cavity of resorption (1d) connected, and valve body (1) inwall between epicoele (1c) bottom and cavity of resorption (1d) is provided with the valve port (1e) that can be connected;
Described spool comprises screw rod (21) and the plug (22) for shutoff valve port (1e);
Described valve rod (20) is polished rod, and valve rod (20) bottom is passed described through hole (10a) and stretched into epicoele (1c);
Tapped hole is provided with inside screw rod (21) upper end portion, valve rod (20) underpart is provided with the outside thread coordinated with described tapped hole, forms the first screw-thread fit and be connected between valve rod (20) underpart with screw rod (21) upper end portion;
Described epicoele (1c) inner side is provided with the water board (1b) of band interior threaded hole; Described screw rod (21) with form the second screw-thread fit between described interior threaded hole and be connected;
It is can order about screw rod (21) with the up and down loose fit of water board (1b) that described second screw-thread fit connects, and it is being fixedly connected with of tightly connecting in the second screw-thread fit that the first screw-thread fit connects;
It is polygonal pulling part (211) that described screw rod (21) bottom is provided with cross section, during cut-off valve, and the corresponding described import (10) in described pulling part (211) position;
The screw rod (21) of described pulling part (211) below is removably connected with plug (22), and described plug (22) is corresponding with valve port (1e) and mate.
2. a kind of valve according to claim 1, is characterized in that: described through hole (10a) inwall is provided with two circular grooves be arranged above and below, and described seal ring (4) quantity is two, is contained in respectively in two described circular grooves.
3. a kind of valve according to claim 1, it is characterized in that: the cone structure that described plug (22) is large in top, bottom is little, the end face of plug (22) is provided with projection, the lower end surface of described screw rod (21) is provided with mounting groove, and described protruding setting-in enters described mounting groove internal fixtion.
4. a kind of valve according to claim 3, is characterized in that: described projection is fastener, and described mounting groove is draw-in groove, and plug (22) is by the draw-in groove clamping of the lower end of fastener and screw rod (21).
5. a spool method for dismounting for a kind of valve as arbitrarily described in claim 1-3, is characterized in that: described method for dismounting employing one is with the spanner (5) of spanner (5) recess mated with described pulling part (211); It comprises the steps:
A. valve cuts out by rotation hand wheel (3), screw rod (21) activity downwards makes pulling part (211) be in bottom, and described spanner (5) recess stretches into from import (10) and coordinates with pulling part (211);
B. handwheel (3) is loaded in the turning tool strengthening the arm of force, hold spanner (5) control pulling part not rotate, continue counterrotating handwheel (3), screw rod (21) is static not to rotate, and makes valve rod (20) screw out screw rod (21);
C. pulling part (211) is rotated in employing spanner (5), impel described screw rod (21) upwards movable, make the spacing between plug (22) and valve port (1e) with dismounting plug (22), then use spanner (5) dial lower end cap (22) and take out from import (10);
D. spanner (5) is finally adopted to rotate pulling part (211) with direction contrary in step c, impel described screw rod (21) movable downwards, until screw rod (21) lower end is stretched into valve port (1e) and departed from water board (1b), split out spool.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610288207.2A CN105697793B (en) | 2014-11-27 | 2014-11-27 | A kind of spool method for dismounting of valve |
| CN201410706957.8A CN104405894B (en) | 2014-11-27 | 2014-11-27 | A kind of valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706957.8A CN104405894B (en) | 2014-11-27 | 2014-11-27 | A kind of valve |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610288207.2A Division CN105697793B (en) | 2014-11-27 | 2014-11-27 | A kind of spool method for dismounting of valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104405894A true CN104405894A (en) | 2015-03-11 |
| CN104405894B CN104405894B (en) | 2016-09-21 |
Family
ID=52643545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410706957.8A Expired - Fee Related CN104405894B (en) | 2014-11-27 | 2014-11-27 | A kind of valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405894B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108105394A (en) * | 2017-12-15 | 2018-06-01 | 上海悟道机电设备有限公司 | A kind of pneumatic stopping valve |
| CN111720558A (en) * | 2020-06-19 | 2020-09-29 | 邵立坤 | Stop valve |
| CN113798806A (en) * | 2021-09-02 | 2021-12-17 | 荆州市世纪派创石油机械检测有限公司 | Complete device and operation method suitable for plug valve maintenance operation |
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| US4384705A (en) * | 1980-10-13 | 1983-05-24 | Sekisui Kagaku Kogyo Kabushiki Kaisha | Stop valve |
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| CN108105394A (en) * | 2017-12-15 | 2018-06-01 | 上海悟道机电设备有限公司 | A kind of pneumatic stopping valve |
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| CN111720558A (en) * | 2020-06-19 | 2020-09-29 | 邵立坤 | Stop valve |
| CN111720558B (en) * | 2020-06-19 | 2021-09-28 | 上海班德瑞工业用品有限公司 | Stop valve |
| CN113798806A (en) * | 2021-09-02 | 2021-12-17 | 荆州市世纪派创石油机械检测有限公司 | Complete device and operation method suitable for plug valve maintenance operation |
| CN113798806B (en) * | 2021-09-02 | 2023-11-21 | 荆州市世纪派创石油机械检测有限公司 | Complete device and operation method suitable for plug valve inspection and maintenance operation |
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| CN104405894B (en) | 2016-09-21 |
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