CN109780270B - Electromagnetic selector valve - Google Patents
Electromagnetic selector valve Download PDFInfo
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- CN109780270B CN109780270B CN201910275836.5A CN201910275836A CN109780270B CN 109780270 B CN109780270 B CN 109780270B CN 201910275836 A CN201910275836 A CN 201910275836A CN 109780270 B CN109780270 B CN 109780270B
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- 239000007788 liquid Substances 0.000 claims abstract description 155
- 238000007789 sealing Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses an electromagnetic selection valve, which comprises a valve body I, a valve body II, a valve core seat and a lifting device; the valve body I and the valve body II are respectively bonded through bonding surfaces; the mounting surface of the valve body I is provided with a liquid outlet and a liquid inlet, the bonding surface of the valve body II is provided with a liquid outlet and a liquid inlet, the mounting surface is provided with a valve core seat mounting hole, and a valve core seat is arranged in the mounting surface; the liquid inlet and the liquid outlet of the valve body I are respectively communicated with the liquid inlet and the liquid outlet of the valve body II; the valve core seat is provided with a valve core mounting hole and liquid flow holes which are radially communicated and arranged at two sides of the valve core mounting hole; the liquid inlet and the liquid outlet of the valve body II are respectively communicated with the liquid circulation holes on the two sides; the valve core is arranged in the valve core mounting hole through the lifting device; the lower part of the valve core is provided with a liquid circulation groove; when the electromagnetic selector valve is in an open state, the liquid circulation groove is communicated with the liquid circulation holes on two sides of the valve core seat. The invention can effectively realize the selection and switching of the channels by controlling the valve core to move up and down to control the channel switch in the valve body.
Description
Technical Field
The invention relates to the technical field of sampling valves, in particular to an electromagnetic selection valve.
Background
The chemical analyzer is taken as a means of water quality detection, and provides support for the development of environmental protection work in China to a great extent. Similar to manual detection, chemical analyzers use a variety of different reagents and as an analytical instrument should be automated as much as possible. Therefore, most analytical instruments will achieve automatic addition of a variety of different reagents by means of the use of selector valves.
The main defects of the valve are that after the valve is used for a long time, the valve surface is easy to wear, the channel is deviated or liquid leakage is easy to occur; the other is the electromagnetic selection valve, the selection of the liquid inlet channel is realized through the opening and closing of the electromagnetic valve, the sealing mode of the electromagnetic valve is to use the sealing ring for extrusion sealing, the valve surface abrasion and channel deviation can not occur, but the liquid fed by the valve is directly contacted with the sealing ring, if the conditions of strong corrosiveness, strong acid and strong alkali or high temperature and high pressure are met, the sealing ring is easy to damage, the service life of the valve is shortened to a great extent, and meanwhile, the sealing ring is easy to deform after being extruded for many times, the elasticity is difficult to recover, the ideal sealing effect is achieved, and the phenomenon of liquid leakage is generated.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a selection valve which is long in service life and not easy to leak.
In order to achieve the above purpose, the invention provides an electromagnetic selector valve, which comprises a valve body I, a valve body II, a valve core seat and a lifting device; the two end surfaces of the valve body I and the valve body II are respectively a mounting surface and an adhesive surface; the valve body I and the valve body II are respectively bonded through bonding surfaces; the mounting surface of the valve body I is provided with a liquid outlet and a liquid inlet, the bonding surface of the valve body II is provided with a liquid outlet and a liquid inlet, and the mounting surface is provided with a valve core seat mounting hole; the liquid inlet of the valve body I is communicated with the liquid inlet of the valve body II, and the liquid outlet of the valve body II is communicated with the liquid outlet of the valve body I; the valve core seat is fixedly arranged in the valve core seat mounting hole; the valve core seat is provided with a valve core mounting hole and liquid flow holes which are radially communicated and arranged at two sides of the valve core mounting hole; the liquid inlet of the valve body II is communicated with the liquid circulation hole on one side of the valve core seat, and the liquid circulation hole on the other side of the valve core seat is communicated with the liquid outlet of the valve body II; the valve core is arranged in a valve core mounting hole of the valve core seat in a vertically movable manner through the lifting device; the lower part of the valve core is provided with a liquid circulation groove; when the electromagnetic selection valve is in an open state, the liquid circulation groove is communicated with the liquid circulation holes on two sides of the valve core seat; when the electromagnetic selector valve is in a closed state, one ends of the liquid circulation holes on the two sides of the valve core seat, which are close to the valve core mounting holes, are respectively in sealing contact with the outer wall of the valve core.
Wherein, case and case seat transition fit.
Through the up-and-down motion that the case promoted, pushed down, the channel switch between control case and the case seat to effectively control the circulation of feed liquor and play liquid, realize sealed effect through the structure of valve body self, need not the setting of sealing washer, replaced the valve face rotation control of traditional mechanical valve body simultaneously, effectively avoided the valve face wearing and tearing, increased the life-span of valve body.
Further, the bonding surface of the valve body II and the mounting surface of the valve body I are respectively provided with a plurality of liquid inlets and liquid inlets which are in one-to-one correspondence; the bonding surface of the valve body I is provided with a plurality of grooves, the initial ends of the grooves are respectively communicated with the liquid outlet of the bonding surface of the valve body II, and the final ends of the grooves are communicated with the liquid outlet of the mounting surface of the valve body I; the liquid outlet of the valve body II is communicated with the liquid outlet of the valve body I through a corresponding groove; the mounting surface of the valve body II is respectively provided with a plurality of valve core seat mounting holes which are in one-to-one correspondence with the liquid inlets; valve core seats are respectively arranged in the valve core seat mounting holes; corresponding valve cores are respectively arranged in the valve core mounting holes of the valve core seats in a vertically movable manner through corresponding lifting devices; when the electromagnetic selector valve switches channels, the circular arc-shaped liquid circulation grooves of the valve cores corresponding to the communicated channels are communicated with the liquid circulation holes on the two sides of the corresponding valve core seat, and one ends, close to the valve core mounting holes, of the liquid circulation holes on the two sides of the valve core seat corresponding to the rest channels are respectively in sealing contact with the outer walls of the corresponding valve cores.
Through the arrangement of a plurality of liquid inlets, valve core seats and valve cores which are in one-to-one correspondence, the selection arrangement of multiple channels can be effectively realized.
Furthermore, the valve body I, the valve body II, the valve core and the valve core seat are all made of hard materials, such as ceramics (suitable for highly corrosive liquid), metals, plastics and the like.
Furthermore, the inner wall of the valve core mounting hole of the valve core seat and the outer wall of the valve core are smooth surfaces. The domestic matching of the valve core and the valve core seat is realized through grinding and polishing treatment, so that liquid or gas is prevented from leaking.
Further, the lifting device comprises a lifting electromagnetic valve and an electromagnetic valve fixing piece; the electromagnetic valve fixing piece is provided with a valve shaft hole; the valve core is provided with a valve shaft fixing hole; the lifting electromagnetic valve is fixedly arranged on the valve body II through an electromagnetic valve fixing piece; the valve shaft of the lifting electromagnetic valve passes through the valve shaft hole of the electromagnetic valve fixing sheet to be sleeved in the valve shaft fixing hole of the corresponding valve core and is fixedly connected with the corresponding valve core. The lifting and pressing functions of the valve core are realized through the lifting electromagnetic valve.
Further, a fixing pin hole is formed in the position, corresponding to the mounting hole of the valve core seat, of the valve body II, and a positioning pin hole is formed in the position, corresponding to the valve core seat. Through the corresponding positioning of the fixing pin hole and the positioning pin hole, the position positioning of the valve core seat and the valve body II is realized, so that the corresponding liquid inlet and liquid outlet of the valve body II are communicated with the liquid circulation holes on two sides of the valve core seat, and the valve body II and the valve core seat are conveniently fixed.
Further, the first valve body and the second valve body are respectively provided with through vent holes.
Compared with the prior art, the invention has the following advantages:
the invention controls the up-and-down movement of the valve core so as to control the circulation of the channel in the valve body, replaces the control mode of the rotation of the valve surface of the traditional mechanical valve or the opening and closing of the electromagnetic valve, can effectively realize the selective switching or opening and closing of the channel, and avoids the liquid leakage phenomenon caused by the abrasion of the valve surface or the deformation of the sealing ring.
The electromagnetic selection valve adopts hard materials, realizes rigid sealing through grinding and polishing, can achieve ideal sealing effect without using a sealing ring, further prolongs the service life and improves the liquid applicability of the valve body.
According to the invention, the liquid inlet and the liquid outlet are designed to be vertical to the valve surface, so that the traditional structure that the liquid inlet is parallel to the valve surface is changed, and the volume of the valve is effectively reduced.
The electromagnetic selector valve provided by the invention provides a novel channel switching mode, and is simple in structure and easy to operate.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic selector valve in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram illustrating the assembly of the solenoid valve and the valve seat of FIG. 1;
FIG. 3 is a schematic view of a mounting surface of the first valve body of FIG. 1;
FIG. 4 is a schematic view of the bonding surface structure of the first valve body of FIG. 1;
FIG. 5 is a schematic diagram of the bonding surface structure of the second valve body in FIG. 1;
FIG. 6 is a schematic view of a mounting surface structure of the second valve body in FIG. 1;
FIG. 7 is a schematic view of the valve core holder of FIG. 2;
FIG. 8 is a schematic view of the valve core of FIG. 2;
fig. 9 is a cross-sectional view of the spool and spool seat when the electromagnetic selector valve passage is closed in embodiment 1;
fig. 10 is a cross-sectional view of the spool and spool seat of the electromagnetic selector valve of embodiment 1 when a certain passage is opened;
FIG. 11 is a schematic structural view of an electromagnetic selector valve in embodiment 2 of the present invention;
fig. 12 is a schematic diagram of a channel of an electromagnetic selector valve in embodiment 2 of the present invention.
In FIGS. 1 to 10, 1-liquid inlet, 2-groove, 3-liquid outlet, 4-vent, 5-mounting hole, 6-liquid inlet, 7-liquid outlet, 8-vent, 9-solenoid valve mounting hole, 10-spool seat mounting hole, 11-spool seat fixing pin hole, 12-spool mounting hole, 13, 14-liquid flow hole, 15-solenoid valve shaft fixing hole, 16-liquid flow groove, 17-solenoid valve shaft, 18-lifting solenoid valve, 19-solenoid valve fixing piece, 20-spool, 21-spool seat, 22-valve body two, 23-valve body;
in fig. 11 and 12, 110-valve body, 310-valve core seat, 410-valve core, 510-lifting solenoid valve, 511-solenoid valve fixing piece, 111-liquid inlet, 112-liquid outlet, 210-vent hole, 211-solenoid valve fixing hole, 212-valve core seat fixing pin hole, 311-liquid flow hole.
Detailed Description
The electromagnetic selector valve of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the solenoid selector valve of the present invention includes a valve body, and a plurality of one-to-one lift solenoid valves 18, solenoid valve fixing pieces, valve spools, and valve spool holders 21. The valve body comprises a first valve body 23 and a second valve body 22 which are bonded.
For example, as shown in fig. 3, the first valve body has ten liquid inlet holes 1, nine of which are annularly and evenly distributed on the periphery of the mounting surface of the first valve body, and the other is located in a position below the middle of the valve surface. Correspondingly, ten liquid circulation grooves 2 (shown in fig. 4) are engraved on the bonding surface of the first valve body, and the ten grooves 2 intersect at a point which is a liquid outlet and is communicated with a liquid outlet hole 3 arranged on the mounting surface. A plurality of vent holes 4 are arranged on the periphery of the valve body.
As shown in fig. 5, corresponding to the first valve body, ten liquid inlets 6 and ten liquid outlets 7 are respectively arranged on the bonding surface of the second valve body, wherein the positions of the liquid inlets 6 of the second valve body are correspondingly overlapped with and mutually communicated with the positions of the liquid inlets 1 of the first valve body; the position of the liquid outlet 7 of the valve body II is coincided with the starting end of the groove 2 of the valve body I. A plurality of vent holes 8 are arranged on the periphery of the valve body II. The vent hole of the valve body I and the vent hole of the valve body II are overlapped and penetrate through the valve body I and the valve body II. As shown in fig. 6, the mounting surface of the valve body two is provided with a valve core seat mounting hole 10 corresponding to each liquid inlet and liquid outlet, and each valve core seat 21 is mounted in the corresponding valve core seat mounting hole 10.
As shown in fig. 7, the aperture of the valve core mounting hole 12 arranged at the center of the valve core seat is the same as the outer diameter of the valve core, the inner surface of the valve core mounting hole and the outer surface of the valve core are required to be polished smoothly, the valve core 20 is arranged in the valve core mounting hole 12, and no air leakage and no liquid leakage are required during installation; the two sides of the valve core mounting hole 12 of the valve core seat are respectively provided with a through liquid flow hole 13 and a through liquid flow hole 14, the liquid flow holes on the two sides are on the same straight line, and the liquid flow holes on the two sides are respectively communicated with the liquid inlet 6 and the liquid outlet 7 corresponding to the valve body II; the positioning pin hole on the valve core seat is positioned at the radial edge position vertical to the liquid circulation groove, and in combination with fig. 6, the valve body II corresponding position is provided with a valve core seat fixing pin hole 11, when in installation, the positioning pin hole on the valve core seat corresponds to the valve core seat fixing pin hole 11 of the valve body II, in this embodiment, a semicircular design is adopted, and the valve core seat and the valve body II are fixed by inserting a cylindrical pin shaft into a circular pin hole defined by the two.
As shown in fig. 8, the lower part of the valve body is provided with a liquid flow groove 16 along the peripheral side, the liquid flow groove is circular arc-shaped, and the radius of the circular arc is larger than 180 degrees (so that the liquid flow holes on both sides can be communicated when the liquid flow holes are on the same plane with the liquid flow holes of the valve body seat). The upper end of the valve core is provided with an electromagnetic valve shaft fixing hole 15, a lifting electromagnetic valve 18 is fixedly arranged through the electromagnetic valve shaft fixing hole 15, and the valve core is driven to lift and press down through the lifting electromagnetic valve 18.
As shown in fig. 2 and 6, the lift solenoid valve 18 is fixed to the solenoid valve mounting hole 9 provided in the second valve body mounting surface by a solenoid valve fixing piece 19. The solenoid shaft 17 is fixedly arranged in the solenoid shaft fixing hole 15 of the valve core 20 through the solenoid fixing piece 19.
The power of the lifting electromagnetic valve arranged on the valve core is not necessarily required to be consistent, electromagnetic valves with different powers can be selected according to the needs, for example, the power of the electromagnetic valve for feeding common reagents can be smaller than the power of the electromagnetic valve for controlling the corresponding port of the high-temperature high-pressure digestion tank.
As shown in fig. 9, when the passage is closed, the liquid circulation groove 16 of the spool is lower than the liquid circulation holes 13, 14 of the spool seat; as shown in fig. 10, when a certain passage is opened, the liquid flow groove 16 of the corresponding spool and the liquid flow holes 13, 14 of the spool seat are at the same level.
When in use, the liquid inlet hole 1 and the liquid outlet hole 3 on the first valve body are connected by the pipe fitting and the joint. Various reagents respectively flow into the liquid inlet 6 corresponding to the valve body II from the liquid inlet holes 1 of the valve body I. When a certain channel needs to be selected to be switched, the lifting electromagnetic valve 18 corresponding to the channel lifts the valve core 20, the channel corresponding to the liquid flow hole of the valve core seat and the liquid flow groove of the valve core is opened, and liquid sequentially flows through the liquid flow inlet hole 13 of the valve core seat, the liquid flow groove 16 of the valve core and the liquid flow outlet hole 14 of the valve core seat from the liquid inlet hole 6 of the valve body II, then enters the liquid outlet hole 7 of the valve body II, and then flows out from the liquid outlet hole 3 of the valve body I through the groove 2 of the valve body I. When the passage is required to be closed, the solenoid valve 18 is lifted to push down the valve body 20, and the passage corresponding to the liquid flow groove of the valve body is closed, so that the liquid cannot flow through the liquid flow groove of the valve body.
Example 2
The present embodiment is an example of a single-pass electromagnetic valve, and is different from the structure of the multi-pass electromagnetic selector valve in embodiment 1 in that: the number of the valve cores 410, the lifting solenoid valve 510, the solenoid valve fixing sheets 511 and the valve core seat 310 is one; the liquid inlet of the first valve body is correspondingly communicated with the liquid inlet of the second valve body, and the number of the liquid inlets is one; the liquid outlet holes of the first valve body are correspondingly communicated with the liquid outlet holes of the second valve body, and the number of the liquid outlet holes is one; the bonding surface of the valve body I is not provided with a groove; other structures are the same as those in embodiment 1, as shown in fig. 11 and 12.
As shown in fig. 12, the specific working principle of the single-pass electromagnetic valve is as follows: when the valve body is lifted up by the electromagnetic valve, the channel is opened, the liquid flowing groove of the valve body and the liquid flowing hole of the valve core seat are at the same height, at the moment, the liquid flows through the liquid flowing groove of the valve body from the liquid flowing inlet hole of the valve core seat, then flows into the liquid outlet of the valve body from the liquid flowing outlet hole of the valve core seat, and flows out from the liquid outlet 112; when the solenoid valve pushes down the valve element, liquid cannot flow through the liquid flow groove of the valve element, and at this time, the channel of the single-pass solenoid valve is in a closed state.
Claims (8)
1. An electromagnetic selector valve is characterized by comprising a valve body I, a valve body II, a valve core seat and a lifting device; the two end surfaces of the valve body I and the valve body II are respectively a mounting surface and an adhesive surface; the valve body I and the valve body II are respectively bonded through bonding surfaces; the mounting surface of the valve body I is provided with a liquid outlet and a liquid inlet, the bonding surface of the valve body II is provided with a liquid outlet and a liquid inlet, and the mounting surface is provided with a valve core seat mounting hole; the liquid inlet of the first valve body is communicated with the liquid inlet of the second valve body, and the liquid outlet of the second valve body is communicated with the liquid outlet of the first valve body; the valve core seat is fixedly arranged in the valve core seat mounting hole; the valve core seat is provided with a valve core mounting hole and liquid flow holes which are radially communicated and arranged at two sides of the valve core mounting hole; the liquid inlet of the valve body II is communicated with the liquid circulation hole on one side of the valve core seat, and the liquid circulation hole on the other side of the valve core seat is communicated with the liquid outlet of the valve body II; the valve core is arranged in a valve core mounting hole of the valve core seat in a vertically movable manner through the lifting device; the lower end of the valve core is provided with a liquid circulation groove; when the electromagnetic selection valve is in an open state, the liquid circulation groove is communicated with liquid circulation holes on two sides of the valve core seat; when the electromagnetic selector valve is in a closed state, one ends of the liquid circulation holes on two sides of the valve core seat, which are close to the valve core mounting holes, are respectively in sealing contact with the outer wall of the valve core; the bonding surface of the valve body II and the mounting surface of the valve body I are respectively provided with a plurality of liquid inlets and liquid inlets which are in one-to-one correspondence; the bonding surface of the valve body I is provided with a plurality of grooves, the initial ends of the grooves are respectively communicated with the liquid outlet of the bonding surface of the valve body II, and the final ends of the grooves are communicated with the liquid outlet of the mounting surface of the valve body I; the liquid outlet of the valve body II is communicated with the liquid outlet of the valve body I through a corresponding groove; the mounting surface of the valve body II is respectively provided with a plurality of valve core seat mounting holes which are in one-to-one correspondence with the liquid inlets; the valve core seat is respectively arranged in each valve core seat mounting hole; corresponding valve cores are respectively arranged in the valve core mounting holes of the valve core seats in a vertically movable manner through corresponding lifting devices; when the electromagnetic selector valve switches channels, the liquid circulation grooves of the valve cores corresponding to the communicated channels are communicated with the liquid circulation holes on the two sides of the corresponding valve core seat, and one ends, close to the valve core mounting holes, of the liquid circulation holes on the two sides of the valve core seat corresponding to the rest channels are respectively in sealing contact with the outer walls of the corresponding valve cores.
2. The electromagnetic selector valve according to claim 1, characterized in that: the valve body I, the valve body II, the valve core and the valve core seat are all made of hard materials.
3. The electromagnetic selector valve according to claim 2, characterized in that: the hard material is ceramic, metal or plastic.
4. The electromagnetic selector valve according to claim 2, characterized in that: the inner wall of the valve core mounting hole of the valve core seat and the outer wall of the valve core are smooth surfaces.
5. The electromagnetic selector valve according to claim 4, characterized in that: the lifting device comprises a lifting electromagnetic valve and an electromagnetic valve fixing piece; the electromagnetic valve fixing piece is provided with a valve shaft hole; the valve core is provided with a valve shaft fixing hole; the lifting electromagnetic valve is fixedly arranged on the second valve body through an electromagnetic valve fixing piece; the valve shaft of the lifting electromagnetic valve penetrates through the valve shaft hole of the electromagnetic valve fixing sheet to be sleeved in the valve shaft fixing hole of the corresponding valve core and is fixedly connected with the corresponding valve core.
6. The electromagnetic selector valve according to claim 4, characterized in that: and a fixing pin hole is formed in the position, corresponding to the mounting hole of the valve core seat, of the valve body II, and a positioning pin hole is formed in the position, corresponding to the valve core seat.
7. The electromagnetic selector valve according to claim 4, characterized in that: and the valve body I and the valve body II are respectively provided with a through vent hole.
8. The electromagnetic selector valve according to claim 4, characterized in that: the liquid circulation groove is arc-shaped or circular-ring-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910275836.5A CN109780270B (en) | 2019-04-08 | 2019-04-08 | Electromagnetic selector valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910275836.5A CN109780270B (en) | 2019-04-08 | 2019-04-08 | Electromagnetic selector valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109780270A CN109780270A (en) | 2019-05-21 |
| CN109780270B true CN109780270B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910275836.5A Active CN109780270B (en) | 2019-04-08 | 2019-04-08 | Electromagnetic selector valve |
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| CN (1) | CN109780270B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096894B (en) * | 2019-06-18 | 2025-01-07 | 南京纳摩尔仪器有限公司 | A multi-channel electromagnetic selector valve |
| DE102019127955B3 (en) * | 2019-10-16 | 2020-12-24 | J. Schmalz Gmbh | Valve for the fluidic connection of two pneumatic pumps |
| DE102022110478A1 (en) | 2022-04-29 | 2023-11-02 | Kärcher Futuretech GmbH | SWITCHING VALVE FOR SWITCHING BETWEEN A PERMEATE-STAGED OPERATION AND A CONCENTRATE-STAGED OPERATION OF A MULTI-STAGE REVERSE OSMOSIS SYSTEM |
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| CN2222267Y (en) * | 1995-07-08 | 1996-03-13 | 陈国斌 | Self-closing valve for gas leakage |
| CN101699109A (en) * | 2009-10-29 | 2010-04-28 | 南京普鲁卡姆电器有限公司 | Double-air source selection valve |
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| CN109780270A (en) | 2019-05-21 |
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