CN205243994U - Hydraulic drive hydrostatic test high pressure unloading valve - Google Patents
Hydraulic drive hydrostatic test high pressure unloading valve Download PDFInfo
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- CN205243994U CN205243994U CN201521015805.XU CN201521015805U CN205243994U CN 205243994 U CN205243994 U CN 205243994U CN 201521015805 U CN201521015805 U CN 201521015805U CN 205243994 U CN205243994 U CN 205243994U
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Abstract
The utility model provides a hydraulic drive hydrostatic test high pressure unloading valve. Main aim at provides one kind to being accomplished the controlling means that the off -load was pressed to the laggard line height of compression test by instrument under the well testing. Its characterized in that: hydraulic drive hydrostatic test high pressure unloading valve mainly comprises water conservancy end and hydraulic drive end two parts. The hydraulic drive end promotes the case and moves as the driver part when mainly being used for carrying out the off -load, drive the sealed case of ejector pin drive water pressure, opens the off -load passageway, the water conservancy end mainly is to the sealed chamber realization self -energized seal of water under high pressure as executive component to it is sealed to open the conical surface under the drive of hydraulic pressure end ejector pin, makes the water under high pressure circulate as the off -load passageway. This kind of hydraulic drive high pressure unloading valve design benefit, compact structure adopts control hydraulic cylinder drive piston motion, drives the sealed case of ejector pin drive water pressure, opens the sealed vice off -load passageway of the high -pressure conical surface, can lighten workman's work burden, reinforcing security and reliability.
Description
Technical field
The utility model relates to one and is applied to Oil Field, tested downhole tool is completed to the control device of the laggard horizontal high voltage off-load of pressure test.
Background technology
Downhole tool is, in oilfield process, oil well is implemented to the essential corollary equipment of various measures, and its functional reliability must be guaranteed, and needs to test and detect before going into the well, and reaches designing requirement completely and just can put into production. The major function of downhole tool hydraulic pressure detection system is to detect downhole tool whether to meet the seal request under working environment and the bearing capacity under hyperbaric environment. The downhole tool hydraulic pressure that at present field produces is used detects experimental rig and adopts the also many of manual off-load, not only inefficiency, and staff's danger of existing high pressure to leak suddenly while operating unloader. Meaning of the present utility model is for high water pressure test provides a set of relief arrangement that can carry out remote auto control, realizes safety, High-efficient Production.
Summary of the invention
In order to solve the technical problem of mentioning in background technology, the utility model provides a kind of hydraulic-driven water pressure test high-pressure unloading valve, this kind of hydraulic-driven high-pressure unloading valve design is ingenious, compact conformation, adopt and control Driven by Hydraulic Cylinder piston movement, drive top rod driving water-pressure sealed spool, open high pressure conical surface sealing pair unloading channel, can alleviate workman's work burden, strengthen safety and reliability.
The technical solution of the utility model is: this kind of hydraulic-driven water pressure test high-pressure unloading valve, mainly formed by hydraulic-driven end, waterpower end, the first soket head cap screw and the first spring washer, and its unique distinction is:
Described waterpower end is made up of waterpower end lower cover, valve seat, an O type circle, the first back-up ring, spool, guide pin bushing, valve pocket, the 2nd O type circle, the second back-up ring, waterpower end upper cover, the second soket head cap screw, the second spring washer and spring;
Wherein, annexation in described waterpower end between each building block is as follows: waterpower end upper cover coordinates and contacts with the upper surface of valve pocket, waterpower end lower cover coordinates and contacts with the lower surface of valve pocket, and described upper cover and valve pocket adopt the second soket head cap screw to link together, and locking with the second spring washer; Valve pocket inner surface and guide pin bushing outer surface interference fit, spool spigot surface coordinates with guide pin bushing internal surface gaps, and spring one end withstands on spool inner face, and the other end withstands in the spring eye of upper end cover, and valve seat is arranged in valve pocket, valve seat orifice and spool working face close contact; Sealing between guide pin bushing and valve pocket adds the second back-up ring combination sealing with the 2nd O type circle, and between valve seat and valve pocket, sealing adopts an O type circle to add the first back-up ring combination sealing; Close contact between spool working face and valve seat orifice, relies on the elastic force of spring to realize the self sealss of spool and valve seat in cone valve pair; Guide pin bushing is arranged on waterpower end valve inner, plays the guide effect of valve core movement; High-Pressure Water enters in waterpower end cavity by spool pod apertures, and pressure-acting, on spool inner face, is pressed on spool on valve seat, plays good sealing effectiveness; On valve pocket and under waterpower end, cover and be processed with respectively water inlet, delivery port, described water inlet is used for being connected with pressure testing device by high-pressure hose, and described delivery port is used for being connected with water tank by flexible pipe, to realize recycling of water;
Described hydraulic-driven end is made up of hydraulic-driven end lower cover, the 3rd soket head cap screw, the 3rd spring washer, the 3rd O type circle, the 3rd back-up ring, sealing ring, fairlead, piston, cylinder body, hydraulic-driven end upper cover, this special envelope and push rod;
Wherein, annexation in described hydraulic-driven end between each building block is as follows: hydraulic-driven end upper cover adopts end face to coordinate with cylinder upper end face, cylinder body lower surface adopts end face to coordinate with hydraulic-driven end lower cover, three is connected with the 3rd soket head cap screw, and the 3rd spring washer is locking in addition; Piston is arranged on cylinder interior, outside piston face and inner surface of cylinder block matched in clearance, and adopt sealing ring to be sealed; The 3rd O type circle adds the 3rd back-up ring and seals in the mode of combination sealing, to prevent from occurring between hydraulic-driven end lower cover and cylinder body the leakage of hydraulic oil; Adopt piston head periphery and hydraulic-driven end upper cover endoporus matched in clearance, adopt this special envelope to be sealed simultaneously; Push rod adopts and is threaded with piston head, is convenient to change; Guide pin bushing is arranged between piston and cylinder body, plays guide effect;
Hydraulic-driven end upper and lower cover is connected with cylinder body by the 3rd soket head cap screw, connects the 3rd spring washer locking to realize; On piston, be processed with seal groove, realize sealing with sealing ring, be used in combination at hydraulic-driven end lower cover application the 3rd O type circle and the 3rd back-up ring; Piston tip be sealed into portable movable sealing; Upper and lower covers at hydraulic cylinder processes respectively hydraulic oil channel, when piston stretches out, in the middle of lower cover, be oil-in, the side of upper cover is oil-out, and when piston returns, liquid inlet and outlet force feed direction is just contrary, oil inlet and outlet is all connected with fuel tank, realizes recycling of hydraulic oil; Two mouthfuls all process internal thread, are connected with outside by flexible pipe;
Described waterpower end is connected with hydraulic-driven end with the first spring washer by the first soket head cap screw.
The utlity model has following beneficial effect: hydraulic-driven water pressure test high-pressure unloading valve described in the utility model adopts hydraulic-driven, easy to operate, can meet the needs of safety pressurization and off-load. When initial press, the spool of this valve relies on the precompression of spring to keep cone valve in self sealss state, while avoiding initial press, leaks. By increasing the Area Ratio of hydraulic drive piston and cone valve working face, conventional hydraulic system pressure just can be controlled the off-load of higher hydraulic pressure system pressure, ensures effective driving and control to high pressure valve. By increasing the difference of hardness of spool and seat material, thereby make pressure larger, sealing is stronger, good sealing effectiveness can realize the water pressure test time. The flexible of hydraulic cylinder can be controlled by the commutation of hydraulic circuit reversal valve, and rapid operation is simple. Equipment migration, quick and easy for installation, can also realize Long-distance Control according to operating mode if desired, safe and reliable, efficiency is high. In sum, this hydraulic-driven water pressure test high-pressure unloading valve compact conformation, designs ingeniously, is easy to dismounting, handling safety, laborsaving, and it is convenient to control, and effectively operating personnel's safety when guarantee test, has higher practical value.
Brief description of the drawings:
Fig. 1 is the population of two dimension structure cutaway view of hydraulic-driven Long-distance Control water pressure test high-pressure unloading valve described in the utility model.
Fig. 2 is the parts two-dimensional structure cutaway view of waterpower end described in the utility model.
Fig. 3 is the modular construction top view of waterpower end described in the utility model.
Fig. 4 is the parts two-dimensional structure cutaway view of hydraulic-driven end described in the utility model.
Fig. 5 is the modular construction top view of hydraulic-driven end described in the utility model.
Fig. 6 is the three-dimensional structure schematic diagram front view of the spool of waterpower end described in the utility model.
Fig. 7 is the structural representation revolved view of the spool of waterpower end described in the utility model.
Fig. 8 is the two-dimensional structure cutaway view of the valve seat of waterpower end described in the utility model.
Fig. 9 is the three-dimensional structure schematic diagram of the valve seat of waterpower end described in the utility model.
Figure 10 is the two-dimensional structure cutaway view of the guide pin bushing of waterpower end described in the utility model.
Figure 11 is the three-dimensional structure schematic diagram of the guide pin bushing of waterpower end described in the utility model.
Figure 12 is the piston rod part two-dimensional structure cutaway view of hydraulic-driven end described in the utility model.
Figure 13 is the piston rod part three-dimensional structure schematic diagram of hydraulic-driven end described in the utility model.
Figure 14 is waterpower end upper cover three-dimensional structure schematic diagram described in the utility model.
Figure 15 is the valve pocket two-dimensional structure cutaway view of waterpower end described in the utility model.
1-hydraulic-driven end in figure, 2-waterpower end, 4-the first soket head cap screw, 3-the first spring washer, 5-waterpower end lower cover, 6-valve seat, 7-the one O type circle, 8-the first back-up ring, 9-spool, 10-guide pin bushing, 11-valve pocket, 12-the 2nd O type circle, 13-the second back-up ring, 14-waterpower end upper cover, 15-the second soket head cap screw, 16-the second spring washer, 17-spring, 18-hydraulic-driven end lower cover, 19-the 3rd soket head cap screw, 20-the 3rd spring washer, 21-the 3rd O type circle, 22-the 3rd back-up ring, 23-sealing ring, 24-fairlead, 25-piston, 26-cylinder body, 27-hydraulic-driven end upper cover, the special envelope of 28-Si, 29-push rod, 30-spool working face, 31-spool inner face, 32-spool spigot surface, 33-spool pod apertures, 34-valve seat orifice, 35-guide pin bushing inner surface, 36-guide pin bushing outer surface, 37-push rod head, 38-piston head, 39-spring eye, 40-waterpower end upper cover lower surface, 41-valve pocket upper surface, 42-valve pocket lower surface, 43-outside piston face, 44-valve pocket inner surface.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the hydraulic-driven high-pressure unloading valve of institute's utility model is mainly made up of hydraulic-driven end 1, waterpower end 2, the first soket head cap screw 3 and spring washer 4, and it specifically forms structure and is:
Waterpower end is made up of waterpower end lower cover 5, valve seat 6, an O type circle 7, the first back-up ring 8, spool 9, guide pin bushing 10, valve pocket 11, the 2nd O type circle 12, the second back-up ring 13, waterpower end upper cover 14, the second soket head cap screw 15, spring washer 16, spring 17 etc.
The each portion of waterpower end annexation is: waterpower end upper cover 14 coordinates and contacts with the upper surface 41 of valve pocket 11, waterpower end lower cover 5 coordinates and contacts with the lower surface 42 of valve pocket 11, and upper cover and valve pocket adopt the second soket head cap screw 15 to link together, and locking with the second spring washer 16. Valve pocket inner surface 44 and guide pin bushing outer surface 36 interference fit, spool spigot surface 32 and guide pin bushing inner surface 35 matched in clearance, spring 17 one end withstand on spool inner face 31, the other end withstands in the spring eye 39 of waterpower end upper cover 14, valve seat 6 is arranged in valve pocket 11, valve seat orifice 34 and spool working face 30 close contacts. Sealing between guide pin bushing 10 and valve pocket 11 adds the second back-up ring 13 combination sealings with the 2nd O type circle 12, and between valve seat 6 and valve pocket 11, sealing adopts an O type circle 7 to add the first back-up ring 8 combination sealings.
After waterpower end assembling, rely on the elastic force of spring 17 to make spool working face 30 and valve seat orifice 34 close contacts, realize the self sealss of spool 9 and valve seat 6 in cone valve pair. Meanwhile, when selection, the larger material of material selection hardness of spool, the less plastic metal material of material selection hardness of valve seat, makes the two produce larger difference of hardness, and like this, after pressurization, pressure is larger, and the two contact is tightr, and sealing effectiveness is better.
If Figure 10 is in conjunction with as shown in Fig. 1, Fig. 7, Figure 11, guide pin bushing 10 is arranged on waterpower end valve inner, play the guide effect of valve core movement, therefore guide pin bushing inner surface 35 and the machining accuracy of spool spigot surface 32 can be improved, thereby reduce the machining accuracy of waterpower end valve cover and the machining accuracy of guide pin bushing outer surface, saved processing cost.
If Fig. 7 is in conjunction with as shown in Fig. 2, High-Pressure Water enters in waterpower end cavity by spool pod apertures 33, and pressure-acting, on spool inner face 31, is tightly pressed in spool 9 on valve seat 6, plays good sealing effectiveness.
On valve pocket 11 and waterpower end lower cover 5 be processed with entery and delivery port, water inlet is connected with pressure testing device by high-pressure hose, delivery port is connected with water tank by flexible pipe, realizes recycling of water.
Hydraulic-driven end is by hydraulic-driven end lower cover 18, the three soket head cap screw 19, the three spring washer 20, the three O type circle 21, the three back-up rings 22, sealing ring 23, fairlead 24, piston 25, cylinder body 26, hydraulic-driven end upper cover 27, this special envelope 28, push rod 29 compositions such as grade.
Hydraulic-driven end each several part annexation is: hydraulic-driven end upper cover 27 adopts end face to coordinate with cylinder body 26 upper surfaces, cylinder body lower surface adopts end face to coordinate with hydraulic-driven end lower cover 18, three is coupled together with the 3rd soket head cap screw 19, and spring washer 20 is locking in addition. Piston 25 is arranged on cylinder body 26 inside, outside piston face 43 and inner surface of cylinder block matched in clearance, and adopt sealing ring 23 to be sealed. For preventing from occurring between hydraulic-driven end lower cover 18 and cylinder body 26 leakage of hydraulic oil, the mode that adopts the 3rd O type circle 21 to add the 3rd back-up ring 22 combination sealings seals. The periphery of piston head 38 and hydraulic-driven end upper cover endoporus matched in clearance, adopt this special envelope 28 to be sealed herein, and push rod 29 adopts and is threaded with piston head 38, is convenient to change. Fairlead 24 is arranged between piston 25 and cylinder body 26, plays guide effect.
If Figure 12 is in conjunction with as shown in Fig. 1, Figure 13, because piston 25 and push rod 29 diameters differ larger, consider that processing is inconvenient, therefore push rod 29 one end are processed to external screw thread, in piston head 38, process screwed hole, the two employing is threaded, and design had both avoided large stress to concentrate like this, facilitated again the replacing of push rod head. The diameter of push rod head 37 is less, this is to have utilized the Area Ratio that increases hydraulic drive piston and spool working face, just can control the off-load of higher hydraulic pressure system pressure by conventional hydraulic system pressure, push rod head is stressed less, consider compact conformation, save material, therefore the push rod head of minor diameter just can meet the demands. Consider again the integral rigidity of push rod and piston, so piston head 38 intended diameter are larger, met integral rigidity requirement.
Hydraulic-driven end upper and lower covers is connected with cylinder body 26 by the 3rd soket head cap screw 19, and the 3rd spring washer 20 is for locking equally. On piston 25, be processed with seal groove, realize sealing with sealing ring 23, the form being used in combination at lower cover application the 3rd O type circle 21 and the 3rd back-up ring 22 is with enhanced leaktightness effect. Piston tip be sealed into portable movable sealing, consider that sealing property herein has relatively high expectations, applied this special envelope 28, with enhanced leaktightness effect. Upper and lower covers at hydraulic cylinder processes respectively hydraulic oil channel, when piston stretches out, in the middle of lower cover, be oil-in, the side of upper cover is oil-out, and when piston returns, liquid inlet and outlet force feed direction is just contrary, oil inlet and outlet is all connected with fuel tank, realizes recycling of hydraulic oil. Two mouthfuls all process internal thread, are connected with outside by flexible pipe, do so easy to connect, simple.
When assembling, first waterpower end 2 and 1 two parts of hydraulic-driven end are assembled respectively completely, then waterpower end and hydraulic-driven end are linked together with the first soket head cap screw 4 and the first spring washer 3, realize the overall package of high-pressure unloading valve.
Operation principle of the present utility model is: by complete all Assembly of the parts, and high-pressure unloading valve is accessed after pressure testing system, check errorless, start pressurization, start hydraulic test pump, in pressure testing device, inject water under high pressure, now water enters in the valve body chamber of waterpower end 2, spool 9, under the elastic force of spring 17 and the effect of fluid pressure, is pushed down valve seat 6, realizes sealing. Pressure reaches after required value, and disable motor-hydraulic test pump unit, carries out pressurize, after pressurize finishes, starts off-load. Now starter motor-hydraulic pump unit, pass into pressure oil from the oil inlet passage of the lower cover 18 of hydraulic-driven end 1, pressure oil acts on piston 25, piston 25 promotes push rod 29 along fairlead 24 and moves upward, by push rod, spool is backed down, make spool 9 overcome spring force and fluid pressure moves upward along guide pin bushing 10, between spool 9 and valve seat 6, produce gap, water discharges by the delivery port of waterpower end 2, realizes off-load. Then by two four-way electromagnetic reversing valve energising commutations, hydraulic oil is oppositely entered, driven plunger 25 turns back to origin-location, and spool 9 resets under spring-force driven dual, again contacts sealing with valve seat 6, for test next time is prepared.
When concrete application, waterpower end valve core relies on spring to apply precompression with initial contact of valve seat, realizes self sealss. Be arranged on the guide pin bushing of waterpower end valve inner, play the guide effect of valve core movement, guide pin bushing adopts stainless steel material, the machining accuracy of guide pin bushing inner surface and valve core outer surface is improved, the machining accuracy of waterpower end housing body and the requirement on machining accuracy of guide pin bushing outer surface are reduced, save processing cost, and can effectively reduce action of rust. Push rod adopts hierarchic structure, and upper end diameter is more carefully convenient to drive poppet valve core by unloading hole, and lower diameter is convenient to slightly greatly improve rigidity, and lower end threading, with liquid presses piston pole screw-internal thread fit, is convenient to the impaired rear replacing of push rod head. Whole device adopts hydraulic-driven, can realize Long-distance Control according to working condition requirement, easy to operate simple, safe and reliable when work.
Claims (1)
1. a hydraulic-driven water pressure test high-pressure unloading valve, is mainly made up of hydraulic-driven end (1), waterpower end (2), the first soket head cap screw (4) and the first spring washer (3), it is characterized in that:
Described waterpower end is made up of waterpower end lower cover (5), valve seat (6), an O type circle (7), the first back-up ring (8), spool (9), guide pin bushing (10), valve pocket (11), the 2nd O type circle (12), the second back-up ring (13), waterpower end upper cover (14), the second soket head cap screw (15), the second spring washer (16) and spring (17);
Wherein, annexation in described waterpower end between each building block is as follows: waterpower end upper cover (14) coordinates and contacts with the upper surface (41) of valve pocket (11), waterpower end lower cover (5) coordinates and contacts with the lower surface (42) of valve pocket (11), and described upper cover and valve pocket adopt the second soket head cap screw (15) to link together, and locking with the second spring washer (16); Valve pocket inner surface (44) and guide pin bushing outer surface (36) interference fit, spool spigot surface (32) and guide pin bushing inner surface (35) matched in clearance, spring (17) one end withstands on spool inner face (31), the other end withstands in the spring eye (39) of waterpower end upper cover (14), valve seat (6) is arranged in valve pocket (11), valve seat orifice (34) and spool working face (30) close contact; Sealing between guide pin bushing (10) and valve pocket (11) adds the sealing of the second back-up ring (13) combination with the 2nd O type circle (12), and between valve seat (6) and valve pocket (11), sealing adopts an O type circle (7) to add the sealing of the first back-up ring (8) combination; Close contact between spool working face (30) and valve seat orifice (34), relies on the elastic force of spring (17) to realize the self sealss of spool in cone valve pair (9) and valve seat (6); Guide pin bushing (10) is arranged on waterpower end valve inner, plays the guide effect of valve core movement; High-Pressure Water enters in waterpower end cavity by spool pod apertures (33), and pressure-acting is upper at spool inner face (31), spool (9) is pressed on to valve seat (6) upper, plays good sealing effectiveness; Above and on waterpower end lower cover (5) be processed with respectively water inlet, delivery port at valve pocket (11), described water inlet is used for being connected with pressure testing device by high-pressure hose, and described delivery port is used for being connected with water tank by flexible pipe, to realize recycling of water;
Described hydraulic-driven end is made up of hydraulic-driven end lower cover (18), the 3rd soket head cap screw (19), the 3rd spring washer (20), the 3rd O type circle (21), the 3rd back-up ring (22), sealing ring (23), fairlead (24), piston (25), cylinder body (26), hydraulic-driven end upper cover (27), this special envelope (28) and push rod (29);
Wherein, annexation in described hydraulic-driven end between each building block is as follows: hydraulic-driven end upper cover (27) adopts end face to coordinate with cylinder body (26) upper surface, cylinder body lower surface adopts end face to coordinate with hydraulic-driven end lower cover (18), three is connected with the 3rd soket head cap screw (19), and the 3rd spring washer (20) is locking in addition; Piston (25) is arranged on cylinder body (26) inside, outside piston face (43) and inner surface of cylinder block matched in clearance, and adopt sealing ring (23) to be sealed; The 3rd O type circle (21) adds the 3rd back-up ring (22) and seals in the mode of combination sealing, to prevent from occurring between hydraulic-driven end lower cover (18) and cylinder body (26) leakage of hydraulic oil; Adopt periphery and the hydraulic-driven end upper cover endoporus matched in clearance of piston head (38), adopt this special envelope (28) to be sealed simultaneously; Push rod (29) adopts and is threaded with piston head (38), is convenient to change; Fairlead (24) is arranged between piston (25) and cylinder body (26), plays guide effect;
Hydraulic-driven end upper and lower cover is connected with cylinder body (26) by the 3rd soket head cap screw (19), connects the 3rd spring washer (20) locking to realize; Piston is processed with seal groove on (25), realizes sealing with sealing ring (23), is used in combination with the 3rd back-up ring (22) at hydraulic-driven end lower cover application the 3rd O type circle (21); Piston (25) top be sealed into portable movable sealing; Upper and lower covers at hydraulic cylinder processes respectively hydraulic oil channel, when piston stretches out, in the middle of lower cover, be oil-in, the side of upper cover is oil-out, and when piston returns, liquid inlet and outlet force feed direction is just contrary, oil inlet and outlet is all connected with fuel tank, realizes recycling of hydraulic oil; Two mouthfuls all process internal thread, are connected with outside by flexible pipe;
Described waterpower end is connected with hydraulic-driven end with the first spring washer (3) by the first soket head cap screw (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015805.XU CN205243994U (en) | 2015-12-09 | 2015-12-09 | Hydraulic drive hydrostatic test high pressure unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015805.XU CN205243994U (en) | 2015-12-09 | 2015-12-09 | Hydraulic drive hydrostatic test high pressure unloading valve |
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| Publication Number | Publication Date |
|---|---|
| CN205243994U true CN205243994U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521015805.XU Withdrawn - After Issue CN205243994U (en) | 2015-12-09 | 2015-12-09 | Hydraulic drive hydrostatic test high pressure unloading valve |
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| Country | Link |
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| CN (1) | CN205243994U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105332966A (en) * | 2015-12-09 | 2016-02-17 | 东北石油大学 | High pressure unloading valve for hydraulic driving hydrostatic test |
| CN109211561A (en) * | 2018-11-21 | 2019-01-15 | 霍山嘉远智能制造有限公司 | A kind of thin-walled lid panel hydraulic pressure test fixture |
-
2015
- 2015-12-09 CN CN201521015805.XU patent/CN205243994U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105332966A (en) * | 2015-12-09 | 2016-02-17 | 东北石油大学 | High pressure unloading valve for hydraulic driving hydrostatic test |
| CN109211561A (en) * | 2018-11-21 | 2019-01-15 | 霍山嘉远智能制造有限公司 | A kind of thin-walled lid panel hydraulic pressure test fixture |
| CN109211561B (en) * | 2018-11-21 | 2024-02-23 | 霍山嘉远智能制造有限公司 | Thin-wall cover plate hydrostatic test tool |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160518 Effective date of abandoning: 20171114 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160518 Effective date of abandoning: 20171114 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |