CN107013685A - A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method - Google Patents
A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method Download PDFInfo
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- CN107013685A CN107013685A CN201710252131.2A CN201710252131A CN107013685A CN 107013685 A CN107013685 A CN 107013685A CN 201710252131 A CN201710252131 A CN 201710252131A CN 107013685 A CN107013685 A CN 107013685A
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- Prior art keywords
- valve
- valve seat
- sealing
- liquid
- runner
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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
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- 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
- F16K1/385—Valve members of conical shape contacting in the closed position, over a substantial axial length, a seat surface having the same inclination
-
- 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
- F16K1/42—Valve seats
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Lift Valve (AREA)
Abstract
A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method, using the structure type of runner low in and high out, medium is entered by lower section, from right outflow.This structure design can be effectively prevented from the depositional phenomenon occurred when static coal water slurry medium or not smooth circulation, and then avoid making the adverse consequences of valve seal failure because medium coking occurs, tungsten carbide thermal spraying treatment is used to runner, the advantage of thermal spraying is that coating consistency is big, the ability combined with matrix is strong, coating deposition efficiency is high, and the sealing of valve element and valve seat uses double sealing structure.I.e. first face of cylinder is sealed into time sealing, and second conical surface seal is primary seal.During closing, the valve element face of cylinder is introduced into valve seat endoporus, realizes time sealing, and then valve element continues to decline, and the valve element conical surface and valve seat taper-face contact complete primary seal, by the design of primary and secondary double sealing structure, valve is easier closing, and sealing property is more reliable.
Description
Technical field
Present invention relates particularly to mechanical equipment technical field, and in particular to a kind of liquid-operated corner type anti-friction valve and its Wear-resistant Treatment
Method.
Background technology
Currently available technology be used for medium be high-temperature particle thing anti-friction valve in use, coal water slurry medium is easy
It is deposited in runner, so as to cause depositional phenomenon, so as to occur making valve seal failure not because medium coking occurs
Good consequence, and the anti-wear performance of existing anti-friction valve is not good, and Wear-resistant Treatment and difficulty of processing are high, it is not easy to operate.
The content of the invention
In order to solve the deficiencies in the prior art, of the invention provides a kind of liquid-operated corner type anti-friction valve and its Wear-resistant Treatment side
Method.
The technical solution that the present invention is used is：A kind of liquid-operated corner type anti-friction valve, including valve body and valve rod, described valve
Body is provided with bonnet, and the front end of described valve rod, which is provided with flap, described valve body, is provided with valve seat, is provided with and is situated between in described valve body
Mass flow road, the inlet of described medium runner is located at the bottom of valve body.
The liquid outlet of described medium runner is located at the right side of valve body.
Described flap includes secondary sealing and the primary seal portion on time sealing, described secondary sealing of bottom
It is integrally formed with primary seal portion, the sealing surface of described secondary sealing is column sealed face, described secondary sealing and valve base chamber
The face of cylinder is sealed, and described primary seal portion and the junction of time sealing are provided with the conical surface, and described primary seal portion is bored with valve base chamber
Face is sealed, and open position, flap last time sealing and the valve base chamber face of cylinder that described flap includes separating with valve seat are sealed
Primary seal portion and the major seal of valve base chamber conical surface seal on secondary sealing station and flap.
Described flap is made with valve seat of overall stellite.
Described flap is with valve rod head using being threadedly coupled, and described flap and the screw connection point on valve rod head are also
It is coated with high temperature resistant glue.
The inlet of described medium runner is provided with inlet cannula, and the liquid outlet of described medium runner is provided with outlet
Sleeve pipe, described inlet cannula and the inner chamber sprayed wc of outlet sleeve are handled.
It is interference fitted between described valve seat and inlet cannula.
A kind of wear resistant processing method of liquid-operated corner type anti-friction valve, it is characterised in that comprise the following steps：
（1）The processing of spray gun thermal spraying tungsten carbide is carried out to the lumen runner of valve；
（2）The inner chamber of inlet cannula and outlet sleeve carries out sprayed wc processing：When outlet sleeve is sprayed, first to outlet sleeve
Left-half runner sprayed, then outlet sleeve is put into valve body, and welded in right side binding site, weldering
The right side of outlet sleeve is finished again after the completion of connecing, to ensure the sealing property of end face, finally again to outlet sleeve
Right half part runner sprayed, inlet cannula spray when, point top half and the latter half are sprayed twice, first to entering muzzle
The top half runner of pipe is sprayed, and is then put into inlet cannula in valve body, finally the latter half again to inlet cannula
Runner is sprayed；
（3）The Wear-resistant Treatment and installation of valve element and valve rod：Valve element is made with valve seat of overall stellite, and first valve rod is whole
Body is nitrogenized, then sprays the nitration case at position with grinding machine removal valve rod, then is sprayed, and finally carries out finishing again obtaining
Higher case hardness, valve element is with valve rod head using being threadedly coupled, and smearing high temperature resistant glue in screw thread position during assembling makes valve
Core is permanently fixed with valve rod；
（4）The installation of valve seat and inlet cannula：Using heating assembling method assembling valve seat and inlet cannula, inlet cannula is put into and added
Heat, valve seat is pressed into inlet cannula with forcing press in hot equipment then, valve seat is turned into an entirety with inlet cannula.
The beneficial effects of the invention are as follows：The invention provides a kind of liquid-operated corner type anti-friction valve and its wear resistant processing method, adopt
With the structure type of runner low in and high out, medium is entered by lower section, from right outflow.This structure design can be effectively prevented from
The depositional phenomenon occurred when coal water slurry medium is static or circulates not smooth, and then avoid losing valve seal because medium coking occurs
The adverse consequences of effect, tungsten carbide thermal spraying treatment is used to runner, the advantage of thermal spraying is that coating consistency is big, is combined with matrix
Ability it is strong, coating deposition efficiency is high, and the sealing of valve element and valve seat uses double sealing structure.I.e. first face of cylinder is sealed into
Secondary sealing, second conical surface seal is primary seal.During closing, the valve element face of cylinder is introduced into valve seat endoporus, realizes time sealing, then
Valve element continues to decline, the valve element conical surface and valve seat taper-face contact, completes primary seal, by the design of primary and secondary double sealing structure, makes
Valve is easier to close, and sealing property is more reliable.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is flap closed mode structural representation of the present invention.
Fig. 3 is valve flap structure schematic diagram of the present invention.
1- valve bodies in figure, 2- valve rods, 3- bonnets, 4- flaps, 5- valve seats, 6- inlets, 7- liquid outlets, 41- sealing,
42- primary seals portion, the 43- conical surfaces, 61- inlet cannulas, 71- outlet sleeves.
Embodiment
The present invention is further described in conjunction with Fig. 1, Fig. 2, Fig. 3, a kind of liquid-operated corner type anti-friction valve, including valve body 1
With valve rod 2, described valve body 1 is provided with bonnet 3, and the front end of described valve rod 2, which is provided with flap 4, described valve body 1, is provided with valve
Medium runner is provided with seat 5, described valve body 1, the inlet 6 of described medium runner is located at the bottom of valve body 1.Described Jie
The liquid outlet 7 in mass flow road is located at the right side of valve body 1, and using the structure type of low in and high out, medium is entered by lower section, from right stream
Go out.This structure design can be effectively prevented from the depositional phenomenon occurred when static coal water slurry medium or not smooth circulation, and then keep away
Exempt from the adverse consequences for making valve seal fail because medium coking occurs.
Described flap 4 includes the secondary sealing 41 of bottom and the primary seal portion 42 on time sealing 41, described
Secondary sealing 41 is integrally formed with primary seal portion 42, and the sealing surface of described secondary sealing 41 is column sealed face, described time
The face of cylinder is sealed between sealing 41 and valve seat 5, and described primary seal portion 42 and the junction of time sealing 41 is provided with the conical surface 43, institute
On conical surface seal between the primary seal portion 42 stated and valve seat 5, open position that described flap 4 includes separating with valve seat 5, flap 4
The sealed conical surface 43 between primary seal portion 42 and valve seat 5 on time sealing station and flap 4 in the face of cylinder between secondary sealing 41 and valve seat 5
Seal the major seal of envelope.Using double sealing structure.I.e. first face of cylinder is sealed into time sealing, second conical surface seal
For primary seal.During closing, the flap face of cylinder is introduced into valve seat endoporus, realizes time sealing, and then flap continues to decline, the flap conical surface
With valve seat taper-face contact, primary seal is completed, by the design of primary and secondary double sealing structure, valve is easier closing, and sealing
More reliable performance.
Described flap 4 is made with valve seat 5 of overall stellite, and the advantage of stellite is that hardness is high,
Wearability is good, and the thermal coefficient of expansion of stellite is low, be less prone under worst hot case spool jam, operating difficulties,
The phenomenons such as sealing face leakage.
Described flap 4 is used with the head of valve rod 2 and is threadedly coupled, described flap 4 and the threaded joints on the head of valve rod 2
Position is also coated with high temperature resistant glue, valve element is permanently fixed with valve rod.Interference is matched somebody with somebody between described valve seat 5 and inlet cannula 61
Close, the magnitude of interference is about 0.3mm, using heating assembling method assembling.Inlet cannula is put into certain temperature is heated in firing equipment,
Then valve seat is pressed into inlet cannula with forcing press, then valve seat turns into an entirety with inlet cannula, and binding site does not have
There is gap, disclosure satisfy that the use requirement under worst hot case.
The inlet 6 of described medium runner is provided with inlet cannula 61, and the liquid outlet 7 of described medium runner is provided with
Outlet sleeve 71, described inlet cannula 61 and the inner chamber sprayed wc of outlet sleeve 71 are handled.In order to improve valve flowing channel
Wearability, it is necessary to use tungsten carbide thermal spraying treatment to runner, the advantage of thermal spraying is that coating consistency is big, is combined with matrix
Ability it is strong, coating deposition efficiency is high.But, because the nominal dimension of valve is DN50, lumen runner can be direct with spray gun
Spraying, and the size of entrance and outlet flow is too small, general spray gun can not completely put in runner and be sprayed.Then in valve
The entrance and outlet flow of body use 304 stainless steel sleeve tubular constructions, and the inner chamber of inlet cannula and outlet sleeve is sprayed
Tungsten carbide processing, improves the wearability of valve flowing channel by this method.
A kind of wear resistant processing method of liquid-operated corner type anti-friction valve, comprises the following steps：
（1）The processing of spray gun thermal spraying tungsten carbide is carried out to the lumen runner of valve；
（2）The inner chamber of inlet cannula and outlet sleeve carries out sprayed wc processing：When outlet sleeve is sprayed, first to outlet sleeve
Left-half runner sprayed, then outlet sleeve is put into valve body, and welded in right side binding site, weldering
The right side of outlet sleeve is finished again after the completion of connecing, to ensure the sealing property of end face, finally again to outlet sleeve
Right half part runner sprayed, noting can not be disposable by left-half runner and right half before outlet sleeve puts into valve body
Portion of runner is all sprayed, because tungsten carbide hardness is very high, so right side will be made not finish, inlet cannula spraying
When, point top half and the latter half are sprayed twice, first the top half runner of inlet cannula are sprayed, then by entrance
Sleeve pipe is put into valve body, and finally the latter half runner of inlet cannula is sprayed again, notes spraying outlet and inlet cannula
When valve seat protected with special tooling, in order to avoid spraying when be damaged；
（3）The Wear-resistant Treatment and installation of valve element and valve rod：Valve element is made with valve seat of overall stellite, and first valve rod is whole
Body is nitrogenized, and the nitration case that valve rod sprays position is being removed with grinding machine（Because hardness is higher after nitridation, it is impossible to direct spraying, first
Nitration case is removed with grinding machine, then is sprayed, so as to obtain higher case hardness）, then sprayed, finishing is finally carried out again
Work is so as to obtain higher case hardness, and valve element, using being threadedly coupled, resistance to height is smeared during assembling with valve rod head in screw thread position
Warm glue makes valve element be permanently fixed with valve rod；
（4）The installation of valve seat and inlet cannula：Using heating assembling method assembling valve seat and inlet cannula, inlet cannula is put into and added
Heat, valve seat is pressed into inlet cannula with forcing press in hot equipment then, valve seat is turned into an entirety with inlet cannula.
The type of drive of valve is hydraulic-driven, easy when driving force is larger because the fragility of hard alloy material is big
Damage sealing surface.So valve uses spring buffer structure in design, in addition, the design of hydraulic cylinder also uses buffer structure,
When valve element nearly closed position, valve rod（Or piston rod）It can be acted on by cushion effect, so that driving force when reducing closing.
By the design of double buffering function, make valve more steady in operation, with longer service life.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of liquid-operated corner type anti-friction valve, including valve body（1）And valve rod（2）, described valve body（1）It is provided with bonnet（3）, it is described
Valve rod（2）Front end be provided with flap（4）, described valve body（1）It is interior to be provided with valve seat（5）, it is characterised in that described valve body
（1）It is interior to be provided with medium runner, the inlet of described medium runner（6）Positioned at valve body（1）Bottom.
2. a kind of liquid-operated corner type anti-friction valve according to claim 1, it is characterised in that the liquid outlet of described medium runner
（7）Positioned at valve body（1）Right side.
3. a kind of liquid-operated corner type anti-friction valve according to claim 1, it is characterised in that described flap（4）Including bottom
Secondary sealing（41）With positioned at secondary sealing（41）On primary seal portion（42）, described secondary sealing（41）With primary seal portion
（42）It is integrally formed, described secondary sealing（41）Sealing surface be column sealed face, described secondary sealing（41）With valve seat
（5）Between the face of cylinder seal, described primary seal portion（42）With secondary sealing（41）Junction be provided with the conical surface（43）, described master
Sealing（42）With valve seat（5）Between conical surface seal, described flap（4）Including with valve seat（5）The open position of separation, flap
（4）Last time sealing（41）With valve seat（5）Between the face of cylinder sealedly time sealing station and flap（4）Upper primary seal portion（42）With
Valve seat（5）Between the conical surface（43）Seal the major seal of envelope.
4. a kind of liquid-operated corner type anti-friction valve according to claim 3, it is characterised in that described flap（4）With valve seat（5）
It is made of overall stellite.
5. a kind of liquid-operated corner type anti-friction valve according to claim 1, it is characterised in that described flap（4）With valve rod（2）
Head is using threaded connection, described flap（4）With valve rod（2）The screw connection point on head is also coated with high temperature resistant glue.
6. a kind of liquid-operated corner type anti-friction valve according to claim 2, it is characterised in that the inlet of described medium runner
（6）It is provided with inlet cannula（61）, the liquid outlet of described medium runner（7）It is provided with outlet sleeve（71）, described entrance
Sleeve pipe（61）And outlet sleeve（71）The processing of inner chamber sprayed wc.
7. a kind of liquid-operated corner type anti-friction valve according to claim 6, it is characterised in that described valve seat（5）With entering muzzle
Pipe（61）Between be interference fitted.
8. the wear resistant processing method of the liquid-operated corner type anti-friction valve described in a kind of claim 1, it is characterised in that including following step
Suddenly：
（1）The processing of spray gun thermal spraying tungsten carbide is carried out to the lumen runner of valve；
（2）The inner chamber of inlet cannula and outlet sleeve carries out sprayed wc processing：When outlet sleeve is sprayed, first to outlet sleeve
Left-half runner sprayed, then outlet sleeve is put into valve body, and welded in right side binding site, weldering
The right side of outlet sleeve is finished again after the completion of connecing, to ensure the sealing property of end face, finally again to outlet sleeve
Right half part runner sprayed, inlet cannula spray when, point top half and the latter half are sprayed twice, first to entering muzzle
The top half runner of pipe is sprayed, and is then put into inlet cannula in valve body, finally the latter half again to inlet cannula
Runner is sprayed；
（3）The Wear-resistant Treatment and installation of valve element and valve rod：Valve element is made with valve seat of overall stellite, and first valve rod is whole
Body is nitrogenized, then sprays the nitration case at position with grinding machine removal valve rod, then is sprayed, and finally carries out finishing again obtaining
Higher case hardness, valve element is with valve rod head using being threadedly coupled, and smearing high temperature resistant glue in screw thread position during assembling makes valve
Core is permanently fixed with valve rod；
（4）The installation of valve seat and inlet cannula：Using heating assembling method assembling valve seat and inlet cannula, inlet cannula is put into and added
Heat, valve seat is pressed into inlet cannula with forcing press in hot equipment then, valve seat is turned into an entirety with inlet cannula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710252131.2A CN107013685A (en) | 2017-04-18 | 2017-04-18 | A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710252131.2A CN107013685A (en) | 2017-04-18 | 2017-04-18 | A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107013685A true CN107013685A (en) | 2017-08-04 |
Family
ID=59448241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710252131.2A Withdrawn CN107013685A (en) | 2017-04-18 | 2017-04-18 | A kind of liquid-operated corner type anti-friction valve and its wear resistant processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107013685A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906221A (en) * | 2017-12-21 | 2018-04-13 | 海杰亚（北京）医疗器械有限公司 | Two-bit triplet reversal valve and commutation method for small flow liquid nitrogen low-temperature system |
| CN108180396A (en) * | 2017-12-28 | 2018-06-19 | 四川兴良川深冷科技有限公司 | The pneumatic liquid feeding rifle of LNG angie types |
| CN109084033A (en) * | 2018-08-01 | 2018-12-25 | 南通市电站阀门有限公司 | A kind of valve body and valve seat structure and its assembly technology using insertion locking |
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| CN103195934A (en) * | 2013-04-12 | 2013-07-10 | 上海开维喜阀门集团有限公司 | Abrasion-resistant angle stop valve |
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| 李华贵等: "煤化工用角式耐磨阀", 《阀门》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906221A (en) * | 2017-12-21 | 2018-04-13 | 海杰亚（北京）医疗器械有限公司 | Two-bit triplet reversal valve and commutation method for small flow liquid nitrogen low-temperature system |
| CN107906221B (en) * | 2017-12-21 | 2023-06-09 | 海杰亚（北京）医疗器械有限公司 | Two-position three-way reversing valve for low-flow liquid nitrogen low-temperature system and reversing method |
| CN108180396A (en) * | 2017-12-28 | 2018-06-19 | 四川兴良川深冷科技有限公司 | The pneumatic liquid feeding rifle of LNG angie types |
| CN109084033A (en) * | 2018-08-01 | 2018-12-25 | 南通市电站阀门有限公司 | A kind of valve body and valve seat structure and its assembly technology using insertion locking |
| CN109084033B (en) * | 2018-08-01 | 2020-06-02 | 南通市电站阀门有限公司 | Valve body valve seat structure adopting embedded locking and assembly process thereof |
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Application publication date: 20170804 |