CN103968148A - On line plugging method for leakage flat plate valve - Google Patents
On line plugging method for leakage flat plate valve Download PDFInfo
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- CN103968148A CN103968148A CN201410141831.0A CN201410141831A CN103968148A CN 103968148 A CN103968148 A CN 103968148A CN 201410141831 A CN201410141831 A CN 201410141831A CN 103968148 A CN103968148 A CN 103968148A
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- valve
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- flat plate
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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
- F16K43/00—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose
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- General Engineering & Computer Science (AREA)
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- Pipe Accessories (AREA)
Abstract
The invention discloses an on line plugging method for a leakage flat plate valve. The flat plate valve and a manual hydraulic pouring device are included, a plugging device is arranged at the portion of a valve deck of the flat plate valve in advance, the plugging device comprises an injecting tunnel, a discharging tunnel and a sealing assembly of a valve rod, the injecting tunnel and the discharging tunnel are arranged on the outer diameter side face of the valve deck in the radial direction, and the sealing assembly is composed of a hose clamp and a shroud ring. According to the on line plugging method for the leakage flat plate valve, an original solution is proposed for the problems of the safety performance, the operation performance and the stability performance in the using process of a traditional flat plate valve when on line leakage emergency maintenance is conducted, the maintained flat plate valve can be regenerated and used repeatedly in the overall maintenance process, precious time is earned for the production of an enterprise, the safety of personnel and the safety of the social environment, and meanwhile the maintenance cost of the enterprise is lowered. The on line plugging method is not limited to the petrochemical industry, and can be applied to the on line use of all industries related to the flat plate valve, and the related industries comprise fire protection, water conservancy, electric power, water supply and drainage and the like.
Description
Technical field
the present invention relates to petrochemical field, particularly the online method for blocking of a kind of leakage flat valve.
Background technique
for field of petroleum exploitation, because its operating environment is severe, be mostly high temperature, high pressure, high corrosive environment, in addition, the crude content component complexity of exploiting out: oil, gas, sand, water etc., pipeline and flap type door are proposed to very high requirement: high temperature resistant, high pressure resistant, corrosion-resistant, wear-resistant, stability, pipeline, dull and stereotyped valve Performance and quality will be directly connected to production, personal safety and the social environment safety of enterprise.
dull and stereotyped valve throttle valve is that the pipeline that petrochemical field is comparatively commonly used opens and closes apparatus, and it is damaged molded the forming of special tungsten carbide material of ability by tool anti-impact.By the upper and lower displacement of horizontal moving type valve plate, thereby realize the adjusting of flow.It has the features such as simple for structure.
but no matter classic flat-plate valve rod-type actuator is manually operated type, pneumatic type, electrodynamic type, being still applicable to operating mode is the dull and stereotyped valve of hydraulic type of the above high density of API5000, high pressure pipeline,
capital runs into online, carries Sudden Leakage phenomenon between pressure situation bottom flange and valve rod, in the situation that cannot blinding off a line immediately, how to accomplish quick disposal, with the tremendous economic loss of avoiding enterprise to bring because being forced to stop production; And the personal safety and the social environment safety hazard that cause because of valve invalidation, be the target that in petrochemical industry, people very pay close attention to.PetroChina Company Ltd.'s " for the Pressurized plugging clamp of high-temperature high pressure valve " patent (ZL:200420077525.7), having proposed a kind of pressure is 10MPa, temperature is under 200 DEG C of operating modes, valve packing box is carried out to the pressurized leaking stoppage method of secondary filling, studies carefully its summary of the invention and have following defect:
1. adopt on-the-spot secondary filler tunnel boring, easily produce and fire;
2. adopt on-the-spot tunnel hand drill method, break once card occurs drill bit, especially card is disconnected is, while occurring in perforation, not only to cause secondary leakage, and more unsuitable shutoff;
3. on-the-spot long-acting rate of manipulation time is low, is difficult to accomplish quick blocking, is unfavorable for operator's personal safety;
4. carry out fixture type boring for the valve of corrosion or corrosion, easily produce stress explosion.
online injection rubber type Rapid leakage repairing is the general emergency repair method of application in petrochemical industry in the last few years, but be all after the valve gap of leakage valve being holed based on above-mentioned scene, carrying out injecting glue for the core of valve fills up, this is undoubtedly inefficiency, and has the behave of hidden danger for operator safety.
Summary of the invention
for the technological deficiency existing in above-mentioned prior art means and actual applying working condition, the present invention is intended to propose the online method for blocking of leakage flat valve that a kind of scene can be disposed fast and Safety performance is high.
the technical solution adopted for the present invention to solve the technical problems is: the online method for blocking of a kind of leakage flat valve, comprise dull and stereotyped valve and hand-hydraulic device for casting,
described dull and stereotyped valve is the default blocking device that is equipped with at its valve gap position, this blocking device comprises that valve gap outside diameter face diameter is to the injection tunnel arranging and the tunnel of releasing, and the black box of valve rod, black box is made up of larynx hoop and garter spring, inject tunnel and release tunneling in the inside and outside hole wall of valve gap, it is vertical that the spill annular packing rooved face that injects tunnel and the shaft axis in the tunnel of releasing and the outer side surface setting of larynx hoop is antarafacial, is provided with built-in screw thread and one-way valve is fastening airtight with the joint of releasing at two stomidiums of outer wall of valve gap;
described larynx hoop is annulus tubular, its internal diameter and valve rod are concentric and overlap mutually, the ring-type limited step arranging in external diameter and valve gap endoporus is concentric and overlaps mutually, in two ports up and down of larynx hoop, is provided with garter spring limited step, is provided with the annular packing groove of spill at the outer side surface of larynx hoop; Garter spring is an opening annulus, and two end points of its opening part are divided edge structure, and it is parallel that the table plane of two grooves is antarafacial, the groove of two end points of garter spring opening part, its groove inclination alpha, 25 °≤α≤45 °, larynx hoop is non-metallic material, and garter spring is metal material;
described hand-hydraulic device for casting, comprise hydraulic hand-pump, high pressure hose, colloid-injecting gun and connected element, hydraulic hand-pump is horizontal type structure, comprise Manual pressure bar, feather valve and liquid level are observed porthole, connect the Instrument connection device of a threeway structure at its hydraulic pressure output terminal, an outlet of Instrument connection device is screw threads for fastening by joint and pressure gauge and is connected, another outlet of Instrument connection device is screw threads for fastening by joint with colloid-injecting gun or high pressure hose and is connected, colloid-injecting gun is one horizontal, the barrel-type casing structure that two port claims, by cylinder body, the cylinder cap composition of piston and two ends, piston and cylinder body, between cylinder cap and cylinder body, be provided with O RunddichtringO, between cylinder cap and cylinder body, being screw threads for fastening is connected, the built-in piston that is axially provided with at piston opens and pulls out screw, colloid-injecting gun is by being divided into two parts of hydraulic chamber and filler chamber before and after piston, outer side surface concentric at cylinder block is provided with heating cuff, connected element comprises note mouth, quick plug and seal washer, in heating cuff, be provided with the electric heating panel of ring-type, its input end is connected with external cable.
this method for blocking comprises the following steps:
a. inject pre-seting of tunnel and the tunnel of releasing
inject tunnel and the tunnel moulding of can synchronously holing of releasing in the time that valve gap is made, inject tunnel and release tunneling in the inside and outside hole wall of valve gap, it is vertical that the spill annular packing rooved face of injection tunnel and the shaft axis in the tunnel of releasing and the outer side surface setting of larynx hoop is antarafacial, two stomidiums of outer wall of valve gap be provided with built-in screw thread and one-way valve and the joint of releasing fastening airtight, in the time of processing valve gap endoporus, synchronizing trolley goes out the limited step of larynx hoop;
b. the preparation of larynx hoop, larynx ring
adopt line cutting process technology to cut out expansion gap garter spring blank good car, larynx hoop is non-metallic material, can adopt molding process once-through;
c. the frock of flap type door seal block apparatus
synchronous frock in the time of dull and stereotyped valve integral installation;
d. hydraulic hand-pump, high pressure hose configuration
existing outsourcing piece configuration;
e. the preparation of colloid-injecting gun
adopt machined into technique car to go out gray iron, note mouth, quick plug, pressure cap, the each parts of piston; Assembled formation, outside cylinder body, concentric is installed heating cuff;
f. the frock of hydraulic pressure irrigation device
by coherent to hydraulic hand-pump, high pressure hose, colloid-injecting gun and link frock;
g. Performance Detection
to the good dull and stereotyped valve detection of integral installation time, can synchronously adopt hydraulic method to the blocking device pre-seting and hand-hydraulic device for casting moves and airtight performance detects;
h. the operation of online shutoff
use on-the-spot by detecting the dull and stereotyped valve access tube road that performance is qualified, configure hand-hydraulic device for casting for subsequent use simultaneously, in the time occurring to leak, in hand-hydraulic device for casting colloid-injecting gun filler chamber, insert sealer, turn on the bonnet on valve gap outer wall stomidium one-way valve and the joint of releasing, by the one-way valve of screwing on the high-pressure hose connector of built-in screw thread, sealer is squeezed into injection tunnel by one-way valve, until sealer is extruded from the connection port of releasing, tighten again the joint of releasing, continue to injecting tunnel injecting glue until leakage stops, pulling down high-pressure hose connector tightens one-way valve bonnet again.
ring-type electric heating panel in the heating cuff that in described hand-hydraulic device for casting, outside colloid-injecting gun cylinder body, concentric is installed, energising heating in the time that operating ambient temperature is low-temperature condition.
the present invention is directed to online Safety performance of leaking while repairing in the using process of classic flat-plate valve, operating characteristics and stability problem, the solution of original creation has been proposed, on the valve gap of dull and stereotyped valve, pre-set a set of shutoff online and leaked the device of valve gap, make the maintainer can be efficient, solve safely on-the-spot leakage problem, in addition, its method can make repaired dull and stereotyped valve in the time that entirety is keeped in repair, can also regenerate and reuse, be not only the production of enterprise, personal security and social environment win safely the quality time, also reduced the maintenance cost of enterprise simultaneously, the present invention is not limited to petrochemical industry, for all relevant industries that relate to dull and stereotyped valve, can be applied to online use, as fire-fighting, water conservancy, electric power, plumbing etc.
Brief description of the drawings
fig. 1 is flap type door schematic diagram of the present invention;
fig. 2 is the dull and stereotyped valve A of the present invention place (office puts) structural representation;
fig. 3 is black box Split type structure schematic diagram of the present invention;
fig. 4 is black box assembled state of the present invention (main looking) structural representation;
fig. 5 is black box assembled state of the present invention (B-B analyses and observe) schematic diagram;
fig. 6 is that black box of the present invention uses state (while not injecting sealer) structural representation;
fig. 7 is that black box of the present invention uses state (while injecting sealer) structural representation;
fig. 8 is hand-hydraulic device for casting of the present invention (single tube type) structural representation;
fig. 9 is hand-hydraulic device for casting of the present invention (double hose) structural representation;
figure 10 is hand-hydraulic device for casting colloid-injecting gun of the present invention (office puts) structural representation;
figure 11 is classic flat-plate valve mechanism schematic diagram.
in its figure: 1-valve gap; 2-larynx hoop; 3-valve rod; 4-seal ring; 5-valve seat; 6-clamping bolt; 7-fastening nut; 8-injects tunnel; 9-one-way valve; 9.1-bonnet; 10-garter spring; The 11-tunnel of releasing; The 12-joint of releasing; 12.1-sealer; 13-colloid-injecting gun; 13.1-cylinder body; 13.2-cylinder cap; 13.3-note mouth; 13.4-quick plug; 13.5-pressure cap; 13.6-heating cuff; 13.7-piston; 13.8-piston opens and pulls out screw; 13.9-seal washer; 13.10-hydraulic chamber; 13.11-filler chamber; 13.12-cable; 13.13-O RunddichtringO; 14-high pressure hose; 15-pressure gauge; 16-Instrument connection device; 17-feather valve; 18-Manual pressure bar; 19-hydraulic hand-pump; 20-liquid level is observed porthole.
embodiment
the present invention illustrates specific implementation method using dull and stereotyped valve shown in Fig. 1 as most preferred embodiment:
different from the pressurized leaking stoppage method that tradition is carried out secondary filling to valve gap 1 stuffing box, the present invention has adopted dull and stereotyped valve built-in type that the design concept of blocking device is set, below valve gap 1 stuffing box, be provided with the black box forming with larynx hoop 2 and garter spring 10, to being set, a sealer injects tunnel 8 and the tunnel 11 of releasing at valve gap 1 outside diameter face diameter simultaneously, under dull and stereotyped valve normal working, be arranged at the garter spring 10 of upper and lower two ports of larynx hoop 2 endoporus by interior larynx hoop 2 bore expansion, garter spring 10 is up and down cooperation with valve rod 3, once the stuffing box in valve gap 1 lost efficacy, at the black box of its lower end and valve rod 3 concentrics settings, by inject tunnel 8 inject sealer 12.1 expand extruding under, the garter spring 10 that compressing opening is shunk in 2 deformation of larynx hoop inwardly closes up, valve rod 3 lockings the most at last, thereby form the secondary seal to valve gap 1.
what adopt due to larynx hoop 2 is metal material, there is higher resistance to high temperature and wear-resistant, corrosion-resistant compared with the Sealing of non-metallic material, therefore the present invention is in the severe use working environment of high temperature, high pressure, accomplish circuit failure quick disposal, speed away, workman's personal safety is able to basic guarantee.
injecting tunnel 8 and release tunnel 11 can be in the time that valve gap 1 be made, synchronous boring moulding, in the time of the endoporus of processing valve gap 1, synchronizing trolley goes out the limited step of larynx hoop 2, adopt line cutting process technology to cut out expansion gap garter spring good car 10 blanks, larynx hoop 2 is non-metallic material, can adopt molding process once-through.
by the above-mentioned black box forming with larynx hoop 2 and garter spring 10, in the time of valve integrated tooling, synchronously insert valve, adjust itself and radial and axial the mating of injecting tunnel 8 and the tunnel 11 of releasing, one-way valve 9 and the fastening airtight valve gap 1 outer wall stomidium of joint 12 of releasing, can purchase into the online blocking device of a set of predefined value, this device is at ordinary times under dull and stereotyped valve normal working, inoperative, only, at the bonnet 9.1 of opening on one-way valve 9, sealer 12.1 is squeezed into the rear black box in injection tunnel 8 and could move.
different from the hydraulic pressure colloid-injecting gun 13 of traditional drive structure, sealer 12.1 of the present invention injects and has adopted external hydraulic power source and colloid-injecting gun 13 split design principles, be that manual hydraulic device separates with colloid-injecting gun 13, and carry out hydraulic power conveying with high pressure hose 14, this has not only alleviated the manipulation strength that workman brings due to deadweight, be convenient to the flexibility of execute-in-place, also increased colloid-injecting gun 13 filler chamber's 13.11 plot ratio simultaneously.
different from conventional hydraulic colloid-injecting gun 13, the present invention has adopted the two port of colloid-injecting gun 13 to claim cylinder block 13.1 project organizations, make the filler chamber 11 in cylinder body 13.1 and can two exchanges use with hydraulic chamber 10, after the interior filler of filler chamber 11 is finished again when filling, piston need not be return original position, directly, at the interior filling filler of hydraulic chamber 10, then cylinder body 13.1 Rotate 180s ° are re-assemblied.
for extreme low temperature site work environment such as the distinctive field of petrochemical industry, polar region, oceans, the present invention is provided with locking hood type heating cuff 13.4 at the outer surface concentric of the cylinder body 13.1 of colloid-injecting gun 13, in heating cuff 13.4, be provided with the electric heating panel of ring-type, its input end is connected with external cable 13.12, in the time that linemen's drive line walking inspection pipeline in the wild, can use vehicle power to carry out on-the-spot filler chamber 13.11 and heat, to increase the mobility of filler, be convenient to the timely repairing at Sudden Leakage scene.
the present invention is based on online leakage repairing phenomenon, in the time of the integral production of dull and stereotyped valve products, adopt built-in type design principle, pre-seted a set of secondary plugging device online at valve gap 1 position, not only make the maintainer can be efficient, solve safely on-the-spot leakage problem, and the dull and stereotyped valve of being rushed to repair shutoff is in the time that entirety is safeguarded, as long as take out the sealer 12.1 of shutoff, or change a whole set of black box, valve gap 1 can also be regenerated and be reused, compared with disclosed destructive method for blocking in documents (ZL:200420077525.7), be not only the production of enterprise, personal security and social environment win safely the quality time, also reduced the maintenance cost of enterprise simultaneously, the present invention is not limited to petrochemical industry, for all relevant industries that relate to dull and stereotyped valve, can be applied to online use, as fire-fighting, water conservancy, electric power, plumbing etc.
the foregoing is only a preferred embodiment of invention, can not limit protection scope of the present invention with it, the present invention also can have other structural change, as long as the equalization done according to protection scope of the present invention changes and modifies, all should belong in the scope that the present invention contains.
Claims (2)
1. the online method for blocking of leakage flat valve, comprises dull and stereotyped valve and hand-hydraulic device for casting, it is characterized in that:
Described dull and stereotyped valve is the default blocking device that is equipped with at its valve gap position, this blocking device comprises that valve gap outside diameter face diameter is to the injection tunnel arranging and the tunnel of releasing, and the black box of valve rod, black box is made up of larynx hoop and garter spring, inject tunnel and release tunneling in the inside and outside hole wall of valve gap, it is vertical that the spill annular packing rooved face that injects tunnel and the shaft axis in the tunnel of releasing and the outer side surface setting of larynx hoop is antarafacial, is provided with built-in screw thread and one-way valve is fastening airtight with the joint of releasing at two stomidiums of outer wall of valve gap;
Described larynx hoop is annulus tubular, its internal diameter and valve rod are concentric and overlap mutually, the ring-type limited step arranging in external diameter and valve gap endoporus is concentric and overlaps mutually, in two ports up and down of larynx hoop, is provided with garter spring limited step, is provided with the annular packing groove of spill at the outer side surface of larynx hoop; Garter spring is an opening annulus, and two end points of its opening part are divided edge structure, and it is parallel that the table plane of two grooves is antarafacial, the groove of two end points of garter spring opening part, its groove inclination alpha, 25 °≤α≤45 °, larynx hoop is non-metallic material, and garter spring is metal material;
Described hand-hydraulic device for casting, comprise hydraulic hand-pump, high pressure hose, colloid-injecting gun and connected element, hydraulic hand-pump is horizontal type structure, comprise Manual pressure bar, feather valve and liquid level are observed porthole, connect the Instrument connection device of a threeway structure at its hydraulic pressure output terminal, an outlet of Instrument connection device is screw threads for fastening by joint and pressure gauge and is connected, another outlet of Instrument connection device is screw threads for fastening by joint with colloid-injecting gun or high pressure hose and is connected, colloid-injecting gun is one horizontal, the barrel-type casing structure that two port claims, by cylinder body, the cylinder cap composition of piston and two ends, piston and cylinder body, between cylinder cap and cylinder body, be provided with O RunddichtringO, between cylinder cap and cylinder body, being screw threads for fastening is connected, the built-in piston that is axially provided with at piston opens and pulls out screw, colloid-injecting gun is by being divided into two parts of hydraulic chamber and filler chamber before and after piston, outer side surface concentric at cylinder block is provided with heating cuff, connected element comprises note mouth, quick plug and seal washer, in heating cuff, be provided with the electric heating panel of ring-type, its input end is connected with external cable,
This method for blocking comprises the following steps:
A. inject pre-seting of tunnel and the tunnel of releasing
Inject tunnel and the tunnel moulding of can synchronously holing of releasing in the time that valve gap is made, inject tunnel and release tunneling in the inside and outside hole wall of valve gap, it is vertical that the spill annular packing rooved face of injection tunnel and the shaft axis in the tunnel of releasing and the outer side surface setting of larynx hoop is antarafacial, two stomidiums of outer wall of valve gap be provided with built-in screw thread and one-way valve and the joint of releasing fastening airtight, in the time of processing valve gap endoporus, synchronizing trolley goes out the limited step of larynx hoop;
B. the preparation of larynx hoop, larynx ring
Adopt line cutting process technology to cut out expansion gap garter spring blank good car, larynx hoop is non-metallic material, can adopt molding process once-through;
C. the frock of flap type door seal block apparatus
Synchronous frock in the time of dull and stereotyped valve integral installation;
D. hydraulic hand-pump, high pressure hose configuration
Existing outsourcing piece configuration;
E. the preparation of colloid-injecting gun
Adopt machined into technique car to go out gray iron, note mouth, quick plug, pressure cap, the each parts of piston; Assembled formation, outside cylinder body, concentric is installed heating cuff;
F. the frock of hydraulic pressure irrigation device
By coherent to hydraulic hand-pump, high pressure hose, colloid-injecting gun and link frock;
G. Performance Detection
To the good dull and stereotyped valve detection of integral installation time, can synchronously adopt hydraulic method to the blocking device pre-seting and hand-hydraulic device for casting moves and airtight performance detects;
H. the operation of online shutoff
Use on-the-spot by detecting the dull and stereotyped valve access tube road that performance is qualified, configure hand-hydraulic device for casting for subsequent use simultaneously, in the time occurring to leak, in hand-hydraulic device for casting colloid-injecting gun filler chamber, insert sealer, turn on the bonnet on valve gap outer wall stomidium one-way valve and the joint of releasing, by the one-way valve of screwing on the high-pressure hose connector of built-in screw thread, sealer is squeezed into injection tunnel by one-way valve, until sealer is extruded from the connection port of releasing, tighten again the joint of releasing, continue to injecting tunnel injecting glue until leakage stops, pulling down high-pressure hose connector tightens one-way valve bonnet again.
2. the online method for blocking of leakage flat valve according to claim 1, it is characterized in that the interior ring-type electric heating panel of heating cuff that in described hand-hydraulic device for casting, outside colloid-injecting gun cylinder body, concentric is installed, energising heating in the time that operating ambient temperature is low-temperature condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410141831.0A CN103968148B (en) | 2014-04-10 | 2014-04-10 | A kind of online method for blocking of leakage flat valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410141831.0A CN103968148B (en) | 2014-04-10 | 2014-04-10 | A kind of online method for blocking of leakage flat valve |
Publications (2)
| Publication Number | Publication Date |
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| CN103968148A true CN103968148A (en) | 2014-08-06 |
| CN103968148B CN103968148B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410141831.0A Expired - Fee Related CN103968148B (en) | 2014-04-10 | 2014-04-10 | A kind of online method for blocking of leakage flat valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510052A (en) * | 2018-11-02 | 2019-03-22 | 国网辽宁省电力有限公司丹东供电公司 | A kind of 10 kv cable connect-disconnect plug extracting tools |
| CN112283441A (en) * | 2020-10-20 | 2021-01-29 | 吴忠仪表有限责任公司 | Use method of multistage expansion curing device for inner cavity of control valve stem packing box |
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| US5803108A (en) * | 1996-12-09 | 1998-09-08 | International Marketing, Inc. | Tool and method for inserting a filter element into the valve stem of a wheel assembly |
| CN201209673Y (en) * | 2008-06-20 | 2009-03-18 | 湖北洪城通用机械股份有限公司 | Influent hydraulic operated double-sealing butterfly valve for machinery overhaul sealing water turbine |
| CN202392349U (en) * | 2012-01-12 | 2012-08-22 | 程浩然 | Device for replacing natural gas valve under pressure |
| CN203115382U (en) * | 2013-02-07 | 2013-08-07 | 公安部上海消防研究所 | Online pipeline plugging device |
-
2014
- 2014-04-10 CN CN201410141831.0A patent/CN103968148B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5803108A (en) * | 1996-12-09 | 1998-09-08 | International Marketing, Inc. | Tool and method for inserting a filter element into the valve stem of a wheel assembly |
| CN201209673Y (en) * | 2008-06-20 | 2009-03-18 | 湖北洪城通用机械股份有限公司 | Influent hydraulic operated double-sealing butterfly valve for machinery overhaul sealing water turbine |
| CN202392349U (en) * | 2012-01-12 | 2012-08-22 | 程浩然 | Device for replacing natural gas valve under pressure |
| CN203115382U (en) * | 2013-02-07 | 2013-08-07 | 公安部上海消防研究所 | Online pipeline plugging device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510052A (en) * | 2018-11-02 | 2019-03-22 | 国网辽宁省电力有限公司丹东供电公司 | A kind of 10 kv cable connect-disconnect plug extracting tools |
| CN112283441A (en) * | 2020-10-20 | 2021-01-29 | 吴忠仪表有限责任公司 | Use method of multistage expansion curing device for inner cavity of control valve stem packing box |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103968148B (en) | 2017-01-04 |
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