CN103174850A - Automatic switchover shuttle valve - Google Patents
Automatic switchover shuttle valve Download PDFInfo
- Publication number
- CN103174850A CN103174850A CN2011104399981A CN201110439998A CN103174850A CN 103174850 A CN103174850 A CN 103174850A CN 2011104399981 A CN2011104399981 A CN 2011104399981A CN 201110439998 A CN201110439998 A CN 201110439998A CN 103174850 A CN103174850 A CN 103174850A
- Authority
- CN
- China
- Prior art keywords
- moving walkway
- sliding block
- automatic switchover
- cantilever arm
- suction port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Multiple-Way Valves (AREA)
Abstract
The invention provides an automatic switchover shuttle valve which comprises a valve body and a valve element. The valve body is provided with a valve element mobile cavity. A first air inlet, a second air inlet and a first air outlet are formed in the sidewall of the valve element mobile cavity. The first air inlet and the second air inlet are oppositely arranged. The valve element is located in the valve element mobile cavity and is provided with a first extension arm pointing to the first air inlet and a second extension arm pointing to the second air inlet. A boss which protrudes outwards along the radial direction and is aligned with the first air outlet is arranged between the first extension arm and the second extension arm. Buffer sliding blocks are respectively arranged on the peripheries of the first extension arm and the second extension arm and can slide along the axis of the valve element. Through utilization of the buffer sliding blocks arranged on the peripheries of the extension arms, the automatic switchover shuttle valve can eliminate residual gas between the valve element and the valve body so that the valve element can be switched in place. Moreover, the automatic switchover shuttle valve is simple in structure, easy to realize and good in exhaust effects.
Description
Technical field
The present invention relates to the shuttle valve field, especially, relate to a kind of automatic switchover shuttle valve.
Background technique
The automatic switchover shuttle valve is when switching, due to the motion of shuttle body and the restriction of structure, can produce a part of residual gas and be compressed to a confined space, motion along with the shuttle body, this confined space volume further reduces, residue gas in the space is known from experience the great pressure of generation, hinders the normal operation of main shuttle body.Usually on gas clack box automatic switchover shuttle valve, the toxic emission passage is set, residual gas is discharged, but the restriction due to existing shuttle valve self structure, processing the exhaust passage discharges residual gas and the shuttle body can be switched put in place, have larger difficulty of processing, and easily main shuttle body is caused damage.
Summary of the invention
The object of the invention is to provide a kind of automatic switchover shuttle valve, increases the technical problem of difficulty of processing in order to realize residual gas to discharge to solve existing shuttle valve.
For achieving the above object, the invention provides a kind of automatic switchover shuttle valve, comprising: valve body has the spool mobile cavity, be formed with the first suction port, the second suction port and the first air outlet on the sidewall of spool mobile cavity, the first suction port and the second suction port are oppositely arranged; Spool, be positioned at the spool mobile cavity, have the first cantilever arm that points to the first suction port and the second cantilever arm that points to the second suction port, be provided with radially outwardly and relative with the first air outlet boss between the first cantilever arm and the second cantilever arm, wherein, the periphery of the first cantilever arm and the second cantilever arm is provided with along the axis of spool buffer sliding block slidably.
Further, each buffer sliding block end relative with adjacent suction port is formed with buffer space, is formed with the extruding space between each buffer sliding block end relative with boss.
Further, the spool mobile cavity comprises at first moving walkway at spool mobile cavity two ends, at the 3rd moving walkway and second moving walkway between the first moving walkway and the 3rd moving walkway of centre, the first moving walkway, the second moving walkway and the 3rd moving walkway arrange in turn steppedly, form buffer space between buffer sliding block and the second moving walkway, form between buffer sliding block and the 3rd moving walkway and push the space.
Further, the first moving walkway coordinates with the crest clearance of described the first cantilever arm and described the second cantilever arm; Form respectively the first slide block moving walkway and the second slide block moving walkway between the external diameter of the second moving walkway and cantilever arm, buffer sliding block comprises respectively the first buffer sliding block and the second buffer sliding block with the first slide block moving walkway and the second slide block moving walkway interference fit; The axial length of the 3rd moving walkway is greater than the axial width of boss.
Further, be formed with chamfering on the end face that the 3rd moving walkway is adjacent with the second moving walkway.
Further, also be formed with the second air outlet that is oppositely arranged with the first air outlet on valve body, be provided with safety valve on the second air outlet.
Further, valve body comprises main valve body and is positioned at the first valve gap and second valve gap at main valve body two ends, the first suction port is formed on the madial wall of the first valve gap, and the second suction port is formed on the madial wall of the second valve gap, and the first air outlet and the second air outlet are formed on the madial wall of main valve body.
Further, all be formed with the first moving walkway and the second moving walkway in the first valve gap and the second valve gap, be formed with the 3rd moving walkway in main valve body.
Further, the periphery of buffer sliding block is provided with the first seal ring.
Further, buffer sliding block is provided with the second parallel seal ring and the 3rd seal ring interior week.
Further, the two ends of the periphery of boss are provided with two the 4th parallel seal rings.
Further, the external part of the first cantilever arm is provided with magnet, and the position near magnet in valve body is provided with approach switch.
The present invention has following beneficial effect:
1, automatic switchover shuttle valve provided by the invention, utilization is arranged between the sidewall of the buffer sliding block of cantilever arm periphery and spool mobile cavity and forms buffer space, along with the movement of boss to certain suction port direction, the pressure in the extruding space between boss and buffer sliding block increases gradually, stop spool to move so that it can not switch when putting in place, utilize the high pressure in extruding space this moment, can promote buffer sliding block and enter into buffer space, and then the volume that pushes the space is increased and pressure decreased, spool can be continued mobile, realize switching the purpose that puts in place, this shuttle valve need not to offer drain passage just can realize the eliminating of residual gas, simple in structure, be easy to realize, and good exhaust effect,
2, buffer sliding block can because a series of motions when eliminating the pressure in extruding space to the mobile buffering that forms of spool, have slowed down the suffered impact force of spool, extend the working life of spool;
3, approach switch can detect leaving away of magnet, and then can send the position signal of spool, and which suction port conducting judgement is;
4, safety valve is set on the air outlet, can pressure release guarantees device security when the overpressure in the spool mobile cavity.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.The below is with reference to figure, and the present invention is further detailed explanation.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that the spool of the preferred embodiment of the present invention is in left end;
Fig. 2 is the structural representation that the spool of the preferred embodiment of the present invention mediates;
Fig. 3 is that the spool of the preferred embodiment of the present invention is in the structural representation near right-hand member;
Fig. 4 is the structural representation that the spool of the preferred embodiment of the present invention is in right-hand member; And
Fig. 5 is the external structure schematic diagram of the shuttle valve of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
as shown in Figure 1, shown in, the invention provides a kind of automatic switchover shuttle valve, comprise: valve body 10, have the spool mobile cavity, be formed with the first suction port A1, the second suction port A2 and the first air outlet B1 on the sidewall of spool mobile cavity, wherein, the first suction port A1 and the second suction port A2 are oppositely arranged, spool 30, be positioned at the spool mobile cavity, have the first cantilever arm 31 that points to the first suction port A1 and the second cantilever arm 32 that points to the second suction port A2, be provided with radially outwardly and relative with the first air outlet B1 boss 35 between the first cantilever arm 31 and the second cantilever arm 32, wherein, the periphery of the first cantilever arm 31 and the second cantilever arm 32 is provided with buffer sliding block 40, buffer sliding block 40 be formed with buffer space C between the sidewall of a side of adjacent suction port and spool mobile cavity, be formed with extruding space D between the opposite side of buffer sliding block 40 and boss 35.In the valve body of existing switching shuttle valve, the formation structure of extruding space D may be different, but it can cause that all spool 30 can't be switched and put in place, and in the present invention, when the enough ambassador's spools 30 of pressure in extruding space D can't continue to take action, buffer sliding block 40 direction to corresponding suction port under the gas pressure effect moves, enter in buffer space C, at this moment, volume increase due to extruding space D, the pressure of extruding space D is reduced, and then it is mobile that spool 30 can be continued, and solved spool 30 and can't switch the technical problem that puts in place.
In order to form buffer space C and extruding space D, and be convenient to the installation of buffer sliding block 40, the spool mobile cavity can comprise that the first moving walkway, the second moving walkway and the 3rd moving walkway arrange in turn steppedly at first moving walkway at spool mobile cavity two ends, at the 3rd moving walkway and second moving walkway between the first moving walkway and the 3rd moving walkway of centre.As can be seen from the figure, the spool mobile cavity is the stepped shaft passage that enlarges step by step to the centre from two ends.
specifically, the first moving walkway coordinates with the cantilever arm gap, that is to say, the assembling mode that is Spielpassung between the first moving walkway that is connected with the first suction port and the first cantilever arm also is the assembling mode of Spielpassung between the second channel that is connected with the second suction port and the second cantilever arm, the internal diameter of the second moving walkway is greater than the first moving walkway, make between the first moving walkway and the second moving walkway and formed first order ladder surface, the first slide block moving walkway and the second slide block moving walkway have been formed respectively between the outer surface of the inwall of the second moving walkway and the first cantilever arm 31 and the second cantilever arm 32, buffer sliding block 40 comprises respectively the first buffer sliding block and the second buffer sliding block with the first slide block moving walkway and the second slide block moving walkway interference fit, and, all formed buffer space C between the end that the end of first buffer sliding block sensing the first suction port A1 and the second buffer sliding block are pointed to the second suction port A2 and first order ladder surface.Buffer space C is sealed to form with the slide block moving walkway in the ingress that buffer sliding block 40 be not subjected to external force can be stuck in the slide block moving walkway, after in a single day buffer sliding block 40 is subject to the thrust of gas pressure power or spool 30, will enter in the slide block moving walkway, also can be described as and enter in buffer space C, the volume of extruding space D is increased, the air pressure of extruding space D reduces, and makes spool 30 continue mobile the switching and puts in place.The internal diameter of the 3rd moving walkway is maximum, form second level step surface between the second moving walkway and the 3rd moving walkway, boss 35 moves in the 3rd moving walkway that two relative second level step surfaces limit, the external diameter of the internal diameter of the 3rd moving walkway and boss 35 adapts, and the axial length of the 3rd moving walkway is greater than the axial width of boss 35, so that boss 35 can open or close the first air outlet B1 along with the movement of spool 30.
For the ease of the discharge of gas, be formed with chamfering on the 3rd moving walkway end face adjacent with described the second moving walkway.In fact, this chamfering also can play certain buffer function that stops to buffer sliding block 40, the periphery of buffer sliding block 40 can be provided with the first seal ring 41, the height of the first seal ring 41 is greater than the height of buffer sliding block 40, when moving in buffer sliding block 40 phase buffer space C, the first seal ring 41 at first with the surperficial connecting part of chamfering, buffer sliding block 40 is spacing, when buffer sliding block 40 is subject to larger thrust, utilize the chamfering can be so that the movement of buffer sliding block 40.
The buffer sliding block 40 of both sides coordinates with spool 30, can slow down the impact of spool 30, extends the working life of spool 30.
In order to play further with buffer space C and extruding space D isolation, buffer sliding block 40 parallel have the second seal ring 42 and the 3rd seal ring 43 be set in interior week.
The two ends of the periphery of boss 35 are provided with two the 4th parallel seal ring 35a.
In fact, valve body 10 can be comprised of the part of being convenient to assemble of a plurality of splits, these constituent elements comprise main valve body 11 and are positioned at the first valve gap 13 and second valve gap 15 at main valve body 11 two ends, the first suction port A1 is formed on the madial wall of the first valve gap 13, the second suction port A2 is formed on the madial wall of the second valve gap 15, and the first air outlet B1 is formed on the madial wall of main valve body 11.
The first valve gap 13 and the second valve gap 15 are symmetrical arranged, and both inside all is formed with the first moving walkway and the second moving walkway, only are formed with the 3rd moving walkway in main valve body 11.
Be provided with the seal ring mounting groove on the first valve gap 13 and the second valve gap 15 and end face that main valve body 11 is connected, be provided with the 5th seal ring 12 in these seal ring mounting grooves.
The external part of the first cantilever arm 31 is provided with magnet 51, and the position of the interior close magnet 51 of valve body 10 is provided with approach switch 53.Measure magnet on spools 30 by approach switch 53 and determine spool 30 positions.
In fact, also be formed with the second air outlet B2 that is oppositely arranged with the first air outlet B1 on valve body 10, be provided with safety valve 60 on the second air outlet B2 wherein.Safety valve 60 is set, can pressure release guarantees device security when the overpressure in pressure extrusion space D.
Shuttle valve provided by the invention can back into the residual gas in shuttle valve in gas cylinder by buffer sliding block 40 movably, simplifies the structure, and reduces difficulty of processing.
In Fig. 1, spool 30 is on the left side of spool mobile cavity, the right and left suction pressure is identical, spool 30 makes to cut off between the first suction port A1 and the first air outlet B1 and the second air outlet B2 by sealing between seal ring and main valve body 11, the first valve gap 13 and the second valve gap 15 and closes, the second suction port A2 can and two air outlets between connect, can pass through gas.Approach switch 53 can detect the close of magnet 51, can outwards provide signal and be used for showing spool 30 in the left side, and right side gas is connected.
As shown in Figure 2, when the suction pressure of right-hand member reduced, the gas pressure of the first suction port of left end promoted spool 30 and both sides buffer sliding block 40 moves right.
As shown in Figure 3, when spool 30 and left and right buffer sliding block 40 are subjected to the left side gas push to continue to move in Fig. 3 the position, can produce an extruding space D, push space D this moment and cause the volume minimizing because of the continuation campaign of spool 30, and then pressure raises, can hinder the continuation campaign of spool 30, make spool 30 be difficult to switch and put in place.
As shown in Figure 4, the be squeezed volume of space D of the buffer sliding block 40 on right side reduces the pressure bring and increases and move into to the right buffer space C (buffer space C was cushioned slide block 40 and filled this moment, not shown in Fig. 4), thereby the pressure that will push in the D of space eliminates because volume increases, and spool 30 is switched put in place.Approach switch 53 can detect leaving away of magnet 51, can outwards provide signal and show spool 30 on the right side, and left side gas is connected.
When spool 30 switched, buffer sliding block 40 can because a series of motions when eliminating the pressure of extruding space D to the mobile buffering that forms of spool 30, have slowed down the suffered impact force of spool 30, extend the working life of spool 30.
The profile of shuttle valve provided by the invention is not limited to a certain shape, can be long-round-shape (as shown in Figure 5), can be also cube etc.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. an automatic switchover shuttle valve, is characterized in that, comprising:
Valve body (10), has the spool mobile cavity, be formed with the first suction port (A1), the second suction port (A2) and the first air outlet (B1) on the sidewall of described spool mobile cavity, described the first suction port (A1) and described the second suction port (A2) are oppositely arranged;
Spool (30), be positioned at described spool mobile cavity, have the first cantilever arm (31) that points to described the first suction port (A1) and the second cantilever arm (32) that points to described the second suction port (A2), be provided with radially outwardly and relative with described the first air outlet (B1) boss (35) between described the first cantilever arm (31) and described the second cantilever arm (32), wherein
The periphery of described the first cantilever arm (31) and described the second cantilever arm (32) is provided with along the axis of described spool (30) buffer sliding block (40) slidably.
2. automatic switchover shuttle valve according to claim 1, it is characterized in that, each described buffer sliding block (40) end relative with an adjacent described suction port is formed with buffer space (C), is formed with extruding space (D) between each described buffer sliding block (40) end relative with described boss (35).
3. automatic switchover shuttle valve according to claim 2, it is characterized in that, described spool mobile cavity comprises the first moving walkway that is positioned at described spool mobile cavity two ends, the 3rd moving walkway and the second moving walkway between described the first moving walkway and described the 3rd moving walkway in the centre, described the first moving walkway, described the second moving walkway and described the 3rd moving walkway arrange in turn steppedly, form described buffer space (C) between described buffer sliding block (40) and described the second moving walkway, form described extruding space (D) between described buffer sliding block (40) and the 3rd moving walkway.
4. automatic switchover shuttle valve according to claim 3, is characterized in that,
Described the first moving walkway coordinates with the crest clearance of described the first cantilever arm (31) and described the second cantilever arm (32);
Form respectively the first slide block moving walkway and the second slide block moving walkway between the external diameter of described the second moving walkway and described the first cantilever arm (31) and described the second cantilever arm (32), described buffer sliding block (40) comprises respectively the first buffer sliding block and the second buffer sliding block with described the first slide block moving walkway and described the second slide block moving walkway interference fit;
The axial length of described the 3rd moving walkway is greater than the axial width of described boss (35).
5. automatic switchover shuttle valve according to claim 4, is characterized in that, is formed with chamfering on described the 3rd moving walkway end face adjacent with described the second moving walkway.
6. the described automatic switchover shuttle valve of any one according to claim 3 to 5, it is characterized in that, also be formed with the second air outlet (B2) that is oppositely arranged with described the first air outlet (B1) on described valve body (10), be provided with safety valve (60) on described the second air outlet (B2).
7. automatic switchover shuttle valve according to claim 6, it is characterized in that, described valve body (10) comprises main valve body (11) and is positioned at the first valve gap (13) and second valve gap (15) at described main valve body (11) two ends, described the first suction port (A1) is formed on the madial wall of described the first valve gap (13), described the second suction port (A2) is formed on the madial wall of described the second valve gap (15), described the first air outlet (B1) and described the second air outlet (B2) are formed on the madial wall of described main valve body (11).
8. automatic switchover shuttle valve according to claim 7, it is characterized in that, all be formed with described the first moving walkway and described the second moving walkway in described the first valve gap (13) and described the second valve gap (15), be formed with described the 3rd moving walkway in described main valve body (11).
9. the described automatic switchover shuttle valve of any one according to claim 1 to 5, is characterized in that, the periphery of described buffer sliding block (40) is provided with the first seal ring (41).
10. automatic switchover shuttle valve according to claim 9, is characterized in that, described buffer sliding block (40) be provided with parallel the second seal ring (42) and the 3rd seal ring (43) interior week.
11. according to claim 1 to 5, the described automatic switchover shuttle valve of any one, is characterized in that, the two ends of the periphery of described boss (35) are provided with two parallel the 4th seal rings (35a).
12. the described automatic switchover shuttle valve of any one according to claim 1 to 5, it is characterized in that, the external part of described the first cantilever arm (31) is provided with magnet (51), and the position near described magnet (51) in described valve body (10) is provided with approach switch (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110439998.1A CN103174850B (en) | 2011-12-23 | 2011-12-23 | Automatic switchover shuttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110439998.1A CN103174850B (en) | 2011-12-23 | 2011-12-23 | Automatic switchover shuttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103174850A true CN103174850A (en) | 2013-06-26 |
| CN103174850B CN103174850B (en) | 2015-09-30 |
Family
ID=48634909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110439998.1A Active CN103174850B (en) | 2011-12-23 | 2011-12-23 | Automatic switchover shuttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103174850B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469691A (en) * | 2019-08-09 | 2019-11-19 | 深圳捷工智能电气股份有限公司 | Medical apparatus of oxygen supply |
| CN113331703A (en) * | 2021-06-21 | 2021-09-03 | 宁波方太厨具有限公司 | Steaming and baking cooking equipment |
| US11293462B2 (en) | 2016-02-09 | 2022-04-05 | National Oilwell Varco, L.P. | Pilot close vent valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020100501A1 (en) * | 2001-01-31 | 2002-08-01 | Gilmore Valve Co. | BOP operating system with quick dump valve |
| US20050028864A1 (en) * | 2003-08-08 | 2005-02-10 | Gilmore Valve Co., Ltd. | Chatter resistant shuttle valve |
| CN201310636Y (en) * | 2008-11-19 | 2009-09-16 | 张文利 | Air shuttle valve |
| US20100154896A1 (en) * | 2008-12-20 | 2010-06-24 | Dtl Engineering And Design, L.P. | Shuttle valve |
| CN102003424A (en) * | 2009-09-02 | 2011-04-06 | 捷锐企业(上海)有限公司 | Double-gas source airflow switching valve and control box and gas supply system |
-
2011
- 2011-12-23 CN CN201110439998.1A patent/CN103174850B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020100501A1 (en) * | 2001-01-31 | 2002-08-01 | Gilmore Valve Co. | BOP operating system with quick dump valve |
| US20050028864A1 (en) * | 2003-08-08 | 2005-02-10 | Gilmore Valve Co., Ltd. | Chatter resistant shuttle valve |
| CN201310636Y (en) * | 2008-11-19 | 2009-09-16 | 张文利 | Air shuttle valve |
| US20100154896A1 (en) * | 2008-12-20 | 2010-06-24 | Dtl Engineering And Design, L.P. | Shuttle valve |
| CN102003424A (en) * | 2009-09-02 | 2011-04-06 | 捷锐企业(上海)有限公司 | Double-gas source airflow switching valve and control box and gas supply system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11293462B2 (en) | 2016-02-09 | 2022-04-05 | National Oilwell Varco, L.P. | Pilot close vent valve |
| CN110469691A (en) * | 2019-08-09 | 2019-11-19 | 深圳捷工智能电气股份有限公司 | Medical apparatus of oxygen supply |
| CN113331703A (en) * | 2021-06-21 | 2021-09-03 | 宁波方太厨具有限公司 | Steaming and baking cooking equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103174850B (en) | 2015-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20130209296A1 (en) | Hydraulic Oil Cylinder, Correlative Device Thereof, Hydraulic Cushion System, Excavator And Concrete Pump Truck | |
| CN110580978B (en) | Composite cable | |
| CN103174850A (en) | Automatic switchover shuttle valve | |
| CN203161708U (en) | Buffering hydraulic oil cylinder | |
| CN103291983B (en) | Safety valve and hydraulic support with same | |
| CN103573628A (en) | Compressor | |
| CN103410992B (en) | A kind of totally-enclosed eyeglass-type shutoff valve | |
| CN201991867U (en) | Hard dustproof cylinder | |
| CN202348824U (en) | Two-stage oil cylinder applied to automobile tail plate | |
| CN101629590A (en) | Three-section piston short stroke hydraulic cylinder | |
| CN101984276B (en) | Pneumatic gate valve | |
| CN203285689U (en) | Rolling rotor type compressor | |
| CN105299126A (en) | Two-stage buffer with temperature detection device | |
| CN202768935U (en) | Ball valve comprising valve seat with self-cleaning and dust prevention functions | |
| KR101332260B1 (en) | Hydraulic control valve for breaker | |
| CN102410168B (en) | Pumping mechanism and concrete pumping device | |
| CN204611301U (en) | A kind of laddering oil separator, lubrication system and concrete pumping equipment | |
| CN201059370Y (en) | Non-abrasion valve seal structure | |
| CN204315422U (en) | A kind of constructional device of new switching equipment | |
| CN201910363U (en) | Self-sealing valve used for being connected with density relay | |
| CN215763472U (en) | Check valve for coal mine gas power generation | |
| CN201916278U (en) | Air cylinder | |
| CN205207522U (en) | Two -stage bumper provided with temperature detection device | |
| CN101691867B (en) | Gas discharging structure of double-ring type rotary type compressor cylinder | |
| CN201751640U (en) | Pneumatic mechanical type oil cut-off valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |