CN201787128U - Fluid reversing valve - Google Patents
Fluid reversing valve Download PDFInfo
- Publication number
- CN201787128U CN201787128U CN200920297647XU CN200920297647U CN201787128U CN 201787128 U CN201787128 U CN 201787128U CN 200920297647X U CN200920297647X U CN 200920297647XU CN 200920297647 U CN200920297647 U CN 200920297647U CN 201787128 U CN201787128 U CN 201787128U
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- hock
- push rod
- slide block
- valve body
- fitting seat
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Abstract
The utility model discloses a fluid reversing valve which comprises a valve body and a valve core arranged in the valve body and capable of sliding in the axial direction, wherein one end of the valve body is connected with a return spring seat, and a return spring is arranged in the return spring seat; the other end of the valve body is connected with a valve core driving mechanism mounting base, and a tooth claw slide block and a tooth claw push rod are arranged in the mounting base; the tooth claw slide block is propped and connected between the valve core and the tooth claw slide push rod, a plurality of ratchet wheel teeth and spacing steps are arranged at intervals at the working end of the tooth claw slide block, and tooth claws matched with the ratchet wheel teeth and the spacing steps are arranged at the working end of the tooth claw push rod; a middle flange of the tooth claw push rod is propped against an end part spacing gear of the mounting base, and the pressing end of the tooth claw push rod extends out of the end part spacing gear; a guide rail is arranged in the axial direction on the inner wall of the mounting base, and guide grooves are formed on the tooth claw slide block and the tooth claw push rod respectively; and a first ring groove and a second ring groove are formed on the outer wall of the valve core, and a first opening, a second opening and a third opening are formed on the valve body. The tooth claw push rod can be pressed to change the position of the valve core relative to the valve body so as to reverse. The fluid reversing valve of the utility model has simple structure and is convenient to operate.
Description
Technical field
The utility model relates to selector valve, refers to a kind of fluid diverter valve that is applicable to pneumatic or hydraulic control particularly.
Background technique
In FLUID TRANSPORTATION such as the gas of industrial application, liquid and control system, usually need to adopt various selector valves realize various fluids by, commutate or change the operation of its flow size.Existing fluid diverter valve mainly contains several structural types such as electromagnetic control type, pneumatic control formula, time-based control and artificial controlled standard, and different types of fluid diverter valve is applicable to different occasions.Wherein, artificial controlled standard fluid diverter valve mostly is slide-valve structure and piston cylinder operator, cuts off by control slider or position of piston, to be communicated with different fluid passages, to reach the purpose that makes fluid change flow direction.Yet, the structure of existing artificial controlled standard fluid diverter valve is comparatively complicated, the operation narrow limitation is bigger, the staff can only closely control, in some specific occasions, big as the working environment airborne dust, vibration is big, noise is high, temperature is high, under the situation of on-the-spot non-transformer etc., at this moment the staff can not will realize that the commutation control of fluid is just very difficult near the equipment operation.Simultaneously, existing other fluid diverter valves are higher to the requirement of working environment, obviously also are not suitable for above-mentioned abominable workplace.Therefore, scientific and technical personnel attempt to develop a kind of novel fluid selector valve that can be applied in aforementioned place always.
Summary of the invention
The purpose of this utility model be exactly to provide a kind of simple in structure, easy to operate, can non-transformer or operator can not be close environment under realize fluid diverter valve pneumatic or hydraulic pressure commutation control fast.
For achieving the above object, the fluid diverter valve that the utility model is designed comprises valve body and is arranged in the body cavity spool in axial sliding.One end of described valve body is connected with return spring holder, is provided with the Returnning spring that the end with described spool connects in the described return spring holder inner chamber.The other end of described valve body is connected with spool driving mechanism fitting seat, is provided with hock slide block and hock push rod in the described fitting seat inner chamber.The butt end of described hock slide block and the other end of described spool connect, and the working end of described hock slide block is provided with some spaced apart ratchet gear teeth and limited step.The working end of described hock push rod is provided with the hock that matches with the described ratchet gear teeth and limited step, the end limiting block of the intermediate flange of described hock push rod and described fitting seat connects, and the pressing end of described hock push rod extends outside the end limiting block of described fitting seat.Axially be provided with guard rail on the described fitting seat inwall, be respectively arranged with slider guide groove and the push rod guiding groove that matches with described guard rail on described hock slide block and the described hock push rod.Offer first annular groove and second annular groove on the described spool outer wall, offer first port, second port and third connectivity mouth corresponding to described first annular groove and second annular groove on the described valve body, described spool has two working positions, when described spool is in first working position, described first port and second port are communicated with by described first annular groove, when described spool was in second working position, described first port and third connectivity mouth were communicated with by described second annular groove.
Advantage of the present utility model is: designed fluid diverter valve is pushed its hock push rod at a distance by extraneous mechanism, make hock push rod, hock slide block and spool be in axial sliding with respect to valve body together, with the position of continuous switching spool with respect to valve body, thereby utilize port and groove on spool and the valve body, change fluid passage, reach the purpose that makes fluid change flow direction, simple and quick.Simultaneously, it is simple in structure, is easy to make, and is with low cost, is applicable to conveying, the control system of various fluids.
Preferably, described fluid diverter valve also comprises push rod touching mechanism, and described push rod is touched mechanism and had sleeve, depression bar and Pressure-bar spring.Described sleeve is arranged on the outside of described fitting seat, and one end inward flange links to each other with the end outward flange of described fitting seat, and its other end is provided with annular end cap.Described depression bar comprises touching section that is positioned at sleeve and the section of pushing of extending described annular end cap, an end of described touching section and the pressing end butt of described hock push rod, the inboard butt of the other end of described touching section and described annular end cap; Described Pressure-bar spring is sleeved on the described fitting seat outside, and between the touching section of end inward flange of described sleeve and described depression bar.This push rod touching mechanism cooperates with Returnning spring, for the commutation of fluid diverter valve action is provided with a commutation threshold value, to keep valve element position relatively stable, thereby prevent that aforementioned structure and described spool are too responsive, misoperation too frequently appears in causative action, has improved the safety reliability of fluid diverter valve work.
Further, the external diameter of the touching section of described depression bar and the internal diameter of described sleeve are complementary, and its length is less than the length of described sleeve.
Description of drawings
Structural representation when Fig. 1 is in original state for the fluid diverter valve among the embodiment of the present utility model;
Structural representation when Fig. 2 is in commutation states for fluid diverter valve shown in Figure 1;
Fig. 3 is the three-dimensional sectional structure schematic representation of return spring holder, valve body, fitting seat and the fitting seat of fluid diverter valve shown in Figure 1;
Fig. 4 is the three-dimensional structure for amplifying schematic representation of the hock slide block of fluid diverter valve shown in Figure 1;
Fig. 5 is the three-dimensional structure for amplifying schematic representation of the hock push rod of fluid diverter valve shown in Figure 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
As depicted in figs. 1 and 2, fluid diverter valve of the present utility model comprises valve body 10 and is arranged in valve body 10 inner chambers spool 20 in axial sliding.One end of described valve body 10 is connected with return spring holder 14, is provided with the Returnning spring 30 that the end with described spool 20 connects in described return spring holder 14 inner chambers; The other end of described valve body 10 connects spool driving mechanism fitting seat 13, is provided with hock slide block 40 and hock push rod 50 in described fitting seat 13 inner chambers.
Fig. 3 has showed the concrete structure of return spring holder, valve body, spool driving mechanism fitting seat and the fitting seat of present embodiment fluid diverter valve.As shown in Figure 3, offer the first port 12a, the second port 12b and third connectivity mouth 12c on the sidewall of described valve body 10, be used to connect the conveyance conduit of fluid, preferable, the described first port 12a is presented axially in the neutral position of described second port 12b and third connectivity mouth 12c.Described fitting seat 13 is a hollow structure, and the internal diameter of its inner chamber can carry out spacing to the hock slide block 40 that is arranged in fitting seat 13 inner chambers greater than the internal diameter of described valve body 10 inner chambers.Described fitting seat 13 1 ends are formed with an outward flange 13a, and described valve body 10 can link together by the end outward flange 13a of bolt and described fitting seat 13.Described fitting seat 13 inwalls axially are provided with guard rail 15, be used for to described hock slide block 40 and described hock push rod 50 carries out spacing and the guiding.Preferably, described guard rail 15 is near the inclined-plane of an end end face 15a for matching with described hock slide block 40 of described hock slide block 40.
Described Returnning spring 30 is enclosed within described spool 20 1 ends and is connected between described spool 20 and the described return spring holder 14, be used for described spool 20 is pressed in described hock slide block 40 all the time, and make described spool 20 and described hock slide block 40 that the trend towards the motion of described hock push rod 50 directions be arranged all the time, can overcome the slip resistance of described spool 20, hock slide block 40, hock push rod 50 and make described spool 20 self-returns.Described spool 20 outer walls offer first annular groove 21 and second annular groove 22, described first annular groove 21 and the circular groove of described second annular groove 22 for being parallel to each other.Described first annular groove 21 and described second annular groove 22 match with the aforementioned first port 12a, the second port 12b and third connectivity mouth 12c, form fluid passage.Described spool 20 has two working positions, and when described spool 20 was in first working position, as shown in Figure 1, the described first port 12a and the second port 12b were communicated with by described first annular groove 21; When described spool 20 was in second working position, as shown in Figure 2, described first port 12a and third connectivity mouth 12c were communicated with by described second annular groove 22, thereby make fluid from different path circulations.
Fig. 4 and Fig. 5 have shown the concrete structure of aforementioned hock slide block and hock push rod respectively.As shown in Figure 4, aforementioned hock slide block 40 1 ends are butt end, the other end is the working end, it is provided with some spaced apart ratchet gear teeth 42 and limited step 41 in the working end, the described ratchet gear teeth 42 are preferably the triangle ratchet gear teeth, described limited step 41 is located at the lower side 42a of the described ratchet gear teeth 42, and particularly, the described ratchet gear teeth 42 and described limited step 41 form a helicoid.Described hock slide block 40 outer walls are provided with the slider guide groove 43 that matches with described guard rail 15.With reference to Fig. 5, the end limiting block 13b of the intermediate flange of described hock push rod 50 and described fitting seat 13 connects, the pressing end 50a of described hock push rod 50 extends outside the end limiting block 13b of described fitting seat 13, the working end of described hock push rod 50 is provided with hock 53, described hock 53 matches with the ratchet gear teeth 42 and the limited step 41 of described hock slide block 40, and corresponding described guard rail 15 is provided with push rod guiding groove 54 on the outer wall of described pressure section 51.
As the preferred embodiment of the utility model fluid diverter valve, as depicted in figs. 1 and 2, described fluid diverter valve 1 also comprises push rod touching mechanism, and described push rod is touched mechanism and had sleeve 60, depression bar 70 and Pressure-bar spring 80.Described sleeve 60 is a hollow structure, is arranged on the outside of described fitting seat 13, and one end inward flange is connected with the end outward flange 13a of described fitting seat 13, and the other end is provided with annular end cap 61.Described depression bar 70 comprises touching section 71 that is positioned at sleeve 60 and the section of pushing 72 of extending described top cover 61, one end of described touching section 71 and the pressing end 50a butt of described hock push rod 50, the inboard butt of the other end of described touching section 71 and described annular end cap 61.Described Pressure-bar spring 80 is sleeved on described fitting seat 13 outsides, and between the touching section 71 of end inward flange of described sleeve 60 and described depression bar 70.
Preferably, described Pressure-bar spring 80 is a cylindroid helicalcoil compression spring.Described Pressure-bar spring 80 cooperates with Returnning spring 30, make have only when the external world when depression bar 70 applies axial pressure greater than predetermined value, described depression bar 70, hock push rod 50, hock slide block 40 and spool 20 just can endwisely slip, the commutation action that is fluid diverter valve is provided with a commutation threshold value, to keep spool 20 positions relatively stable, thereby prevent that aforementioned structure and described spool are too responsive, misoperation too frequently appears in causative action, has improved the safety reliability of fluid diverter valve work.In addition, described Pressure-bar spring 80 also has reactivation, buffer function and cushioning effect, can alleviate the impact of depression bar institute bear external force and alleviate the influence of outside vibrations to part in the valve body.
Further, the external diameter of described touching section 71 and the internal diameter of described sleeve 60 are complementary, make like this its in sleeve 60 during axial motion about the travel distance unanimity, make it can axially conduct ambient pressure, thereby make Pressure-bar spring 80 and hock push rod 50 stressed even, increase the service life.The length of described touching section 71 is less than the length of described sleeve 60, and both length differences can be used to control the stroke of depression bar 70 in sleeve 60.Preferable, the section of pushing 72 ends of described depression bar 70 are provided with a roller 72a, to reduce the friction in the operating process, increase the service life.The pressure axis that described depression bar 70 can be imported the outside makes it endwisely slip along the guard rails in the described valve body 10 to passing to described hock push rod 50.Described touching section 71 can be an integral structure, also can be by independent component-assembled; Described touching section 71 and the described section of pushing 72 can be integral structures, also can be independent parts.
Preferably, described annular end cap 61 inboards are provided with a feather key 61a, the section of pushing 72 of described depression bar 70 is provided with the depression bar guiding groove 74 that matches with described feather key 61a, described feather key 61a and described depression bar guiding groove 74 cooperatively interact, and prevent the axially rotation in sleeve 60 of described depression bar 70 and Pressure-bar spring 80.
Preferably, described fluid diverter valve also comprises fitting seat 90, and described fitting seat 90 is connected on the outer wall of described valve body 10 and described sleeve 60, is used for fixing to connect described valve body 10 and described sleeve 60.This fitting seat 90 is as the carrier and the fixing body of whole fluid reversing valve assembly, and as all moving parts, as the guiding and the positioning body of spool 20, hock push rod 50 and hock slide block 40 etc.
Need to prove that the valve body in the present embodiment fluid diverter valve, sleeve, fitting seat can be formed by a plurality of component-assembled, can freely select according to the convenient of processing.
The working principle of the utility model fluid diverter valve is described in conjunction with Fig. 1 and Fig. 2 below once more.At first, the original state of the fluid diverter valve of present embodiment is as follows: Returnning spring 30 and Pressure-bar spring 80 are subjected to precompression and produce spring-back force, promoting spool 20, depression bar 70 etc. automatically resets to the initialization position, at this moment, described spool 20 is positioned at described first working position, the described first port 12a and the second port 12b are communicated with by described first annular groove 21, are not communicated with between the first port 12a and third connectivity mouth 12c, the second port 12b and the third connectivity mouth 12c.The commutation process of aforesaid fluid selector valve is divided into four-stages such as pilot stage, transition stage, translate phase, recovery phase, describes in detail below.
(1) pilot stage: when the external world after depression bar 70 applies an axial pressure greater than threshold value, external force promotes depression bar 70 described Pressure-bar spring 80 of compression and Returnning springs 30, promotes described hock push rod 50, hock slide block 40 and spool 20 simultaneously and endwisely slips towards Returnning spring 30.In this stage, push rod guiding groove 54 and slider guide groove 43 all are set on the guard rail 15 of fitting seat 13, can only endwisely slip along guard rail 15, can not rotate.
(2) transition stage: after depression bar 70 promotion hock push rods 50, hock slide block 40 and spool 20 endwisely slipped certain distance, described slider guide groove 43 broke away from the guard rail 15 of fitting seats 13, and hock slide block 40 can rotate and endwisely slip at this moment.Because the wedge each other and the helicoid of hock push rod 50 and 40 hocks that match of hock slide block, the axial pressure of 50 pairs of hock slide blocks 40 of hock push rod drive the hock slide block 40 some angles of rotation and some distances that endwisely slip.
(3) translate phase: when the external world after axial pressure that depression bar 70 applies is removed, compressed Pressure-bar spring 80 and Returnning spring 30 resiliences, promote described depression bar 70, hock push rod 50, hock slide block 40, spool 20 and endwisely slip, depression bar 70 and hock push rod 50 are automatically reset to the initialization position.Because hock slide block 40 previous stage axial some angles of rotation, slider guide groove 43 misplaces with guard rail 15, can not return the home position.And the spring-back force of Returnning spring 30 promotes the ratchet gear teeth 42 of hock slide block 40 and the end face of guard rail 15 compresses, and promptly the guiding helicoid of the hock face of hock slide block 40 and guard rail 15 1 ends compresses, and this guiding helicoid is made of spaced apart inclined-plane 15a.Force hock slide block 40 to rotate some angles once more, block guard rail 15 until limited step 41, hock slide block 40 can't continue to endwisely slip and axially rotation.This moment, spool 20 was under the two-way function of hock slide block 40 and Returnning spring 30, be in a fixed position, described spool is in second working position, described first port 12a and third connectivity mouth 12c are communicated with by described second annular groove 22, be not communicated with between the first port 12a and the second port 12b, the second port 12b and the third connectivity mouth 12c, realized the commutation function.
(4) recovery phase: when external force is compressed depression bar 70 once more, make the guiding helicoid of the hock emaciated face of described hock slide block 40 from guard rail 15, between both hock helicoids relative slippage appears then again, hock slide block 40 is the some angles of rotation and corresponding some distances that endwisely slip axially, and slider guide groove 43 aligns with guard rail 15 once more at this moment.After external force is eliminated, Pressure-bar spring 80 promotes depression bar 70 returns, Returnning spring 30 promotes that spools 20 slide valve body 10 in, hock push rod 50 and hock slide block 40 be along guard rail 15 slips, up to being reset to the initialization position, at this moment, spool 20 is got back to first working position, finishes commutation process one time.
If the external world exerts pressure to depression bar once more, begin new commutation process again, go round and begin again.
The fluid diverter valve of present embodiment has adopted push type to control, when needs commutate, only need directly artificial or use foreign object the depression bar application of force, easy to operate and safe, non-transformer and staff can not can control at a distance near under the situation of equipment at the scene.In addition, the fluid diverter valve of present embodiment is simple in structure, and low cost of manufacture is economical and practical.
Above disclosed only is the utility model preferred embodiment, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (8)
1. fluid diverter valve comprises valve body (10) and is arranged in valve body (10) inner chamber spool (20) in axial sliding, it is characterized in that:
One end of described valve body (10) is connected with return spring holder (14), is provided with the Returnning spring (30) that the end with described spool (20) connects in described return spring holder (14) inner chamber; The other end of described valve body (10) is connected with spool driving mechanism fitting seat (13), is provided with hock slide block (40) and hock push rod (50) in described fitting seat (13) inner chamber; The other end of the butt end of described hock slide block (40) and described spool (20) connects, and the working end of described hock slide block (40) is provided with some spaced apart ratchet gear teeth (42) and limited step (41); The working end of described hock push rod (50) is provided with the hock (53) that matches with the described ratchet gear teeth (42) and limited step (41), the end limiting block (13b) of the intermediate flange of described hock push rod (50) and described fitting seat (13) connects, and the pressing end (50a) of described hock push rod (50) extends outside the end limiting block (13b) of described fitting seat (13); Axially be provided with guard rail (15) on described fitting seat (13) inwall, be respectively arranged with the slider guide groove (43) and the push rod guiding groove (54) that match with described guard rail (15) on described hock slide block (40) and the described hock push rod (50);
Offer first annular groove (21) and second annular groove (22) on described spool (20) outer wall, described valve body (10) is gone up and is offered first port (12a) corresponding to described first annular groove (21) and second annular groove (22), second port (12b) and third connectivity mouth (12c), described spool (20) has two working positions, when described spool (20) is in first working position, described first port (12a) and second port (12b) are communicated with by described first annular groove (21), when described spool was in second working position, described first port (12a) and third connectivity mouth (12c) were communicated with by described second annular groove (22).
2. fluid diverter valve according to claim 1 is characterized in that: it also comprises push rod touching mechanism, and described push rod is touched mechanism and had sleeve (60), depression bar (70) and Pressure-bar spring (80); Described sleeve (60) is arranged on the outside of described fitting seat (13), and one end inward flange links to each other with the end outward flange (13a) of described fitting seat (13), and its other end is provided with annular end cap (61); Described depression bar (70) comprises touching section (71) that is positioned at sleeve (60) and the section of pushing (72) of extending described annular end cap (61), one end of described touching section (71) and pressing end (50a) butt of described hock push rod (50), the inboard butt of the other end of described touching section (71) and described annular end cap (61); Described Pressure-bar spring (80) is sleeved on described fitting seat (13) outside, and is positioned between the touching section (71) of end inward flange of described sleeve (60) and described depression bar (70).
3. fluid diverter valve according to claim 2 is characterized in that: the external diameter of the touching section (71) of described depression bar (70) and the internal diameter of described sleeve (60) are complementary, and its length is less than the length of described sleeve (60).
4. fluid diverter valve according to claim 2 is characterized in that: the section of pushing (72) end of described depression bar (70) is provided with roller (72a).
5. fluid diverter valve according to claim 2, it is characterized in that: the inboard of described annular end cap (61) is provided with feather key (61a), and the section of pushing (72) of described depression bar (70) is provided with the depression bar guiding groove (74) that matches with described feather key (61a).
6. according to each described fluid diverter valve in the claim 1 to 5, it is characterized in that: described guard rail (15) has the inclined-plane (15a) that matches with the ratchet gear teeth (42) of described hock slide block (40) near the end design of described hock slide block (40).
7. according to each described fluid diverter valve in the claim 1 to 5, it is characterized in that: the ratchet gear teeth (42) of described hock slide block (40) are the triangle ratchet gear teeth.
8. according to each described fluid diverter valve in the claim 1 to 5, it is characterized in that: it also comprises fitting seat (90), and described fitting seat (90) is used for fixing and connects described valve body (10) and described sleeve (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920297647XU CN201787128U (en) | 2009-12-16 | 2009-12-16 | Fluid reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920297647XU CN201787128U (en) | 2009-12-16 | 2009-12-16 | Fluid reversing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201787128U true CN201787128U (en) | 2011-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920297647XU Expired - Lifetime CN201787128U (en) | 2009-12-16 | 2009-12-16 | Fluid reversing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201787128U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709793B (en) * | 2009-12-16 | 2011-10-05 | 南车长江车辆有限公司 | Fluid reversing valve |
| CN102418799A (en) * | 2011-06-28 | 2012-04-18 | 李飞宇 | Push-rod type water-fluid reversing valve |
| CN102556088A (en) * | 2012-02-27 | 2012-07-11 | 南车长江车辆有限公司 | Bottom door opening and closing control device of railway hopper car |
| CN107477210A (en) * | 2017-09-21 | 2017-12-15 | 陈银 | A kind of novel two-position three-way reversal valve |
| CN107688081A (en) * | 2017-10-13 | 2018-02-13 | 袁兴芳 | A kind of sewage detection system |
| EP3388722A1 (en) * | 2017-04-13 | 2018-10-17 | Continental Automotive GmbH | Fluid valve comprising a first body and a second body |
| CN113503103A (en) * | 2021-07-13 | 2021-10-15 | 富阳通力机械制造有限公司 | High-strength invisible opener and working method thereof |
-
2009
- 2009-12-16 CN CN200920297647XU patent/CN201787128U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709793B (en) * | 2009-12-16 | 2011-10-05 | 南车长江车辆有限公司 | Fluid reversing valve |
| CN102418799A (en) * | 2011-06-28 | 2012-04-18 | 李飞宇 | Push-rod type water-fluid reversing valve |
| CN102418799B (en) * | 2011-06-28 | 2013-08-07 | 李飞宇 | Push-rod type water-fluid reversing valve |
| CN102556088A (en) * | 2012-02-27 | 2012-07-11 | 南车长江车辆有限公司 | Bottom door opening and closing control device of railway hopper car |
| EP3388722A1 (en) * | 2017-04-13 | 2018-10-17 | Continental Automotive GmbH | Fluid valve comprising a first body and a second body |
| CN107477210A (en) * | 2017-09-21 | 2017-12-15 | 陈银 | A kind of novel two-position three-way reversal valve |
| CN107688081A (en) * | 2017-10-13 | 2018-02-13 | 袁兴芳 | A kind of sewage detection system |
| CN113503103A (en) * | 2021-07-13 | 2021-10-15 | 富阳通力机械制造有限公司 | High-strength invisible opener and working method thereof |
| CN113503103B (en) * | 2021-07-13 | 2022-06-21 | 富阳通力机械制造有限公司 | High-strength invisible opener and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110406 Effective date of abandoning: 20091216 |