CN203823104U - Self-sealing slide valve - Google Patents
Self-sealing slide valve Download PDFInfo
- Publication number
- CN203823104U CN203823104U CN201420069550.4U CN201420069550U CN203823104U CN 203823104 U CN203823104 U CN 203823104U CN 201420069550 U CN201420069550 U CN 201420069550U CN 203823104 U CN203823104 U CN 203823104U
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- valve
- valve body
- convex shoulder
- spool
- hole
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Abstract
The utility model discloses a self-sealing slide valve, comprising a valve body in which at least one valve hole is arranged; a valve core is arranged in each valve hole in a sliding manner; the valve core at least comprises one convex shoulder of which the outer wall is sealed with the internal wall of the valve hole in a fitting manner, an inlet and an outlet leading to the valve hole are respectively arranged on two sides of the valve body; the valve body is closed when the valve core slides to the convex shoulder to correspond to the inlet and the outlet of the valve body and is opened otherwise. The self-sealing slide valve being not provided with valve rod can be opened and closed under the self pressure, an external fluid transformer can be used in cooperation with a spring to adjust the opening and the closing of the self-sealing valve, a sealing detection hole communicated with an enclosed space or an annular sealed groove is arranged in the valve body; the valve, after being sealed, is enclosed by detecting whether or not a material flows out of the sealing detection hole, thereby achieving the purpose of sealing self-checking.
Description
Technical field
The invention relates to a kind of valve, a kind of valve body Nei You annular sealed chamber (groove), and valve body has the detection closed channel that leads to annular sealed chamber, closes the self-sealed guiding valve that forms sealing chamber between rear guiding valve convex shoulder.
Background technique
existing valvular switch all utilizes a valve head to open and close and realizes, and valve self can not self-inspection, after leakage, can not seal, when requiring when tight-closed, as the hazmat such as poisonous, harmful, inflammable, explosive, need install two valves additional, one once door, a secondary door.
Valve for some for high pressure, such as high pressure exceedes
when 10MPa, the seal request of valve is very high; If medium is the poisonous and harmful medium of high pressure, once valve goes wrong, consequence is more serious, and according to national regulation, for poisonous medium, in the time of maintenance, also need to be provided with a shrouding at the other end of valve again.
Summary of the invention
In order to overcome above-mentioned shortcoming, the invention provides a kind of self-sealed guiding valve, valve can be realized from compressing switch without valve rod, available external fluid transformation coordinates by-pass cock with spring, on valve body, be provided with the detection blind hole communicating with enclosed space or annular seal groove, after valve closing, whether flow out material according to detecting blind hole, carry out close encapsulation, thereby realize the object of self-inspection sealing.
For achieving the above object, the technical program is as follows:
A kind of selfsealings guiding valve, it is characterized in that: comprise valve body, valve body is provided with at least one valve opening, in each valve opening, slide and be provided with a spool, described spool at least comprises a convex shoulder, the inwall fitted seal of the outer wall of convex shoulder and valve opening, the both sides of valve body are respectively equipped with entrance and the outlet of leading to valve opening; When spool slides into the entrance of convex shoulder and valve body and exports at once, now valve body is closed, otherwise, close.
The entrance of convex shoulder and valve body and outlet be corresponding refers to that connecting rod is positioned at the entrance of valve body and the through hole of outlet towards locating, and medium can enter and pass through from the outer wall of connecting rod from entrance, then through outlet outflow.
Further, described convex shoulder at least comprises the sealing convex shoulder and the sealing convex shoulder that are positioned at two ends; Between sealing convex shoulder and sealing convex shoulder, it is connecting rod.
The diameter of connecting rod is preferably less than any above-mentioned shaft shoulder diameter and the two ends connection shaft shoulder.
Further, valve body is provided with at least two valve openings, and each valve opening is provided with the spool that contains convex shoulder, and adjacent two spools are communicated with by through hole, is positioned at the outlet that is communicated with respectively valve body and the entrance of outermost two spools.
Further, in the time of valve opening formation corresponding to convex shoulder closed condition, between adjacent two spools and through hole, form seal space, seal space connection is provided with leak hunting aperture therewith.
Further, at least one end of spool is provided with the end cap corresponding with spool, and the end face of end cap and spool and valve body form seal space; These selfsealings guiding valve also includes the drive unit that makes valve core movement.
Above-mentioned spool refer to end cap gland spool corresponding to end cap.
Further, described drive unit is at least one through hole of being located on valve body or end cap, and one end of through hole communicates with seal space, and the other end is connected with relief tube or hydraulic system.
Further, described drive unit is Compress Spring.
Also can be that a spring is combined with a hydraulic system.
Further, the offside that is provided with connecting rod of spool sealing convex shoulder is provided with the second connecting rod, and the other end of the second connecting rod is connected with guide bulge, and the outer wall of guide bulge coordinates with valve body slipper seal.
Further, the both sides that are positioned at valve outlet, entrance on described valve body are respectively provided with at least one and are positioned at the annular groove of valve opening, are at least provided with a detection hole that annular groove communicates therewith on valve body.
Further, the position of described annular groove meets: valve body is closed: the outlet of the sealing shaft shoulder and valve body and entrance are at once, and annular groove is positioned at the outside of the sealing shaft shoulder.
Further, be connected with solenoid valve with described through hole, the entrance of solenoid valve and pipeline communication.
Further, described hydraulic system comprises emulsion box, and emulsion box is connected with throttle valve through pump, and the outlet of throttle valve is parallel with the through hole of modulating valve and end cap, and the other end of modulating valve flows back to emulsion box
Working principle of the present invention and working procedure are as follows:
The invention mainly comprises the valve body being connected with pipeline, is provided with valve opening in valve body, in each valve opening, is provided with spool, and wherein spool is convex shoulder form, is similar to multidiameter shaft; Spool formation sealing corresponding to valve opening.
This valve seal is effective, and this self-sealing valve is for can be used for the high pressure pipe line that pressure is large, such as upper 10Mpa, even higher; Be applied to the main pipeline better effects if of toxic and harmful.
It is even more that the convex shoulder of this valve can be provided with one, two, three; Access hole by convex shoulder and valve whether corresponding, thus the unlatching of corresponding valve is whether.
This valve also can be provided with multiple valve openings, each valve opening is provided with spool, between adjacent two spools, pass through through hole conducting, when valve is during all in closed condition, through hole forms a sealed cavity, and valve body is provided with the leak hunting aperture of sealed cavity conducting therewith, like this can be by after valve closing, see if there is medium and flow out from leak hunting aperture, leak if flow out explanation, otherwise sealing effect is good; And can be to reverse suppressing in this leak hunting aperture, thereby reach the effect of shutoff; , adopt after the technical program, this valve can be realized self-inspection meanwhile; After having again multiple spools of employing, in the time that needs cutting out pipeline checks, for the poisonous and harmful substance of some national regulation, in order to ensure maintainer's safety, state compulsion just can carry out next step maintenance after specifying to install additional one deck shrouding again, but after employing the technical program, need not after valve, install again shrouding additional, but directly the valve closing of rear one-level can be realized to the object that installs shrouding additional.
The spool of this valve adopts drive unit, and this drive unit can be also that hydraulic system can be also spring for handle, the slip of drive unit control spool, and this spool can one end be deep into valve opening one end to be exposed, and exposed junction can be connected with drive unit; Also can spool be encapsulated in valve opening by gland, ensure the motion of spool by feed flow in the seal space to encapsulation or use Compress Spring.
In valve opening, be provided with annular groove, valve body is provided with the detection hole communicating with annular groove, convex shoulder and valve opening sealing effect OK time, medium after convex shoulder leaks enters into annular groove, finally flow out from detecting hole, so just can detect whether sealing effect is good, and can reversely rush liquid and suppress, reach the object of sealing.
This valve can with external solenoid valve in the space of encapsulation, the high-pressure medium of the entrance of solenoid valve in can connecting pipe, is power thereby utilize the self-pressure masterpiece in pipeline, realizes the manipulation to spool, simultaneously also can external throttle valve, thereby the flow velocity of control valve.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiments that record in the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing;
Fig. 1 is embodiment's 1 opening structure schematic diagram;
Fig. 2 is embodiment's 1 closing structure schematic diagram;
Fig. 3 is embodiment's 2 opening structure schematic diagram;
Fig. 4 is embodiment's 2 closing structure schematic diagram;
Fig. 5 is the manually opened structural representation of embodiment 2;
Fig. 6 is the structural representation of embodiment 2 with regulating system;
Fig. 7 is embodiment's 3 structural representations.
Embodiment
The correlation technique content of not addressing below all can adopt or use for reference prior art.
In order to make those skilled in the art person understand better the technological scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technological scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment who obtains under creative work prerequisite, all should belong to the scope of the application's protection.
Embodiment 1
A kind of selfsealings guiding valve, comprises valve body 1, is provided with a valve opening 2 in valve body, and valve opening 2 can be cylinder sealing surface, stainless steel sleeve or copper sheathing, and the interior slip of valve opening 2 is provided with a spool.
Described spool comprises the sealing convex shoulder 31 and the sealing convex shoulder 32 that are positioned at two ends; Wherein, the outer wall of sealing convex shoulder 31 and sealing convex shoulder 32 coordinates with the inner wall sealing of valve opening 2, seals convex shoulder 31 and seal between convex shoulder 32 to be less than the connecting rod 33 that any above-mentioned shaft shoulder diameter and two ends are connected the shaft shoulder for diameter.
In the present embodiment, preferably valve opening 2 be cylindrical hole, sealing convex shoulder 31 and the cylindric convex shoulders of sealing convex shoulder 32 for coordinating, and along the axial direction of two convex shoulders, the projection coincidence of two convex shoulders; Connecting rod in the present embodiment preferably its axial direction overlaps with the axial direction of convex shoulder.
The both sides of the valve opening of valve body are respectively equipped with entrance 4 and the outlet 5 of leading to valve opening 2.In the present embodiment by vertical with valve opening direction both axial directions of entrance Way out.
When spool slide into connecting rod with the entrance of valve body and outlet at once, correspondence herein refers to that connecting rod is positioned at the entrance of valve body and the through hole of outlet towards locating, and medium can enter and pass through from the outer wall of connecting rod from entrance, then flows out through outlet, now valve body conducting, shown in Fig. 1; When the entrance of convex shoulder and spool and outlet are at once, spool will be sealed and matched, and valve closing, shown in Fig. 2.
In order to realize the motion of spool, in the two ends of spool, at least one end is provided with the end cap corresponding with spool 6, and described correspondence refers to end cap gland spool, and (end cap can be provided with two, and both sides are all provided with end cap; Also can be provided with one, now, valve opening is blind hole).
End cap 6 forms seal space with end face and the valve body of spool, is provided with the drive unit that makes valve core movement in seal space.
This drive unit can be following two kinds of modes:
Mode one: for being located at least one through hole 61 on valve body or end cap, one end of through hole communicates with seal space, and the other end is connected with relief tube or hydraulic system.
Mode two: described drive unit is Compress Spring 62.
Certainly, also can mode one add mode two, one end of spool is installed with spring, and the other end is provided with through hole and relief tube or hydraulic system.
The two ends that are positioned at valve outlet, entrance on described valve body are respectively provided with at least one annular groove 7, and annular groove 7 is positioned at valve opening 2, are at least provided with a detection hole 71 that annular groove communicates therewith on valve body.
The position of described annular groove 7 meets: valve body is closed: the outlet of the sealing shaft shoulder and valve body and entrance are at once, and annular groove is positioned at the outside of the sealing shaft shoulder.
In the time leaking, leakage fluid enters into annular groove 7 like this, and flow out in hole 71 after testing; Can certainly inwardly suppress feed flow from detecting in hole, stop and leak.
For reaching the object of automation, the present embodiment can be communicated with conveyance conduit and with solenoid valve, utilize the pressure in conveyance conduit to promote valve core movement in the outside of through hole.
In the time that the both sides of spool are respectively spring and hydraulic system, hydraulic system can singly connect, and can adjust the dynamics of valve opening according to the size of hydraulic pressure.
Embodiment 2
Shown in Fig. 3,4, a kind of sealed sliding valve that certainly compresses switch, comprises valve body 1, is provided with a valve opening 2 in valve body, and the interior slip of valve opening 2 is provided with a spool.
Described spool comprises three convex shoulders: the sealing convex shoulder 31, sealing convex shoulder 32 and the guide bulge 34 that arrange in turn.
Wherein seal between convex shoulder 31 and sealing convex shoulder 32 and be connected with connecting rod 33, between sealing convex shoulder 32 and guide bulge 34, be connected with the second connecting rod 35.
Wherein, sealing convex shoulder 31, sealing convex shoulder 32 and the outer wall of guide bulge 34 and the inner wall sealing of valve opening coordinate.
In the present embodiment, preferably valve opening 2 be cylindrical hole, sealing convex shoulder 31, sealing convex shoulder 32 and the cylindric convex shoulder of guide bulge 34 for coordinating, and along the axial direction of two convex shoulders, the projection coincidence of three convex shoulders; Connecting rod 33 in the present embodiment, the diameter of the second connecting rod 35 are less than the diameter of three convex shoulders, and preferably connecting rod 33, the second connecting rod 35 axial directions overlap with the axial direction of convex shoulder.
The both sides of the valve opening of valve body are respectively equipped with entrance 4 and the outlet 5 of leading to spool.In the present embodiment, entrance is vertical with valve opening direction with the axial direction of Way out.
When spool slides into the entrance of connecting rod 33 or the second connecting rod 35 and valve body and exports at once, correspondence herein refers to that connecting rod is positioned at the entrance of valve body and the through hole of outlet towards locating, medium can enter and pass through from the outer wall of connecting rod from entrance, then flow out through outlet, now valve body conducting, shown in Fig. 3; When the entrance of a convex shoulder and spool in three convex shoulders and outlet are at once, spool will be sealed and matched, and valve closing, shown in Fig. 4.
In order to realize the motion of spool, in the two ends of spool, at least one end is provided with the end cap corresponding with spool 6, and described correspondence refers to end cap gland spool, and (end cap can be provided with two, and both sides are all provided with end cap; Also can be provided with one, now, valve opening is blind hole),
End cap 6 forms seal space with end face and the valve body of spool, is provided with the drive unit that makes valve core movement in seal space.
This drive unit can be following two kinds of modes:
Mode one: for being located at least one through hole 61 on valve body or end cap, one end of through hole 61 with
relief tubecommunicate, the other end is communicated with hydraulic system.
Mode two: described drive unit is Compress Spring 62.
Certainly, also can mode one add mode two, one end of spool is installed with spring, and the other end is provided with through hole and hydraulic pressure installation.
The two ends that are positioned at valve outlet, entrance on described valve body are respectively provided with at least one annular groove 7, and annular groove 7 is positioned at valve opening 2, are at least provided with a detection hole 71 that annular groove communicates therewith on valve body.
The position of described annular groove 7 meets: valve body is closed: the outlet of the sealing shaft shoulder 32 and valve body and entrance are at once, and annular groove 7 is positioned at the outside of the sealing shaft shoulder, shown in Fig. 4.
In the time leaking, leakage fluid enters into annular groove 7 like this, and flow out in hole 71 after testing; Can certainly, from detecting the interior feed flow of inwardly suppressing in hole 71, stop and leak.
For reaching the object of automation, the present embodiment can be communicated with conveyance conduit and with solenoid valve, utilize the pressure in conveyance conduit to promote valve core movement in the outside of through hole.
In the time that the both sides of spool are respectively spring and hydraulic system, hydraulic system can singly connect, and can adjust the dynamics of valve opening according to the size of hydraulic pressure.
Solenoid valve or modulating valve control for handle hole of the present invention.Adjustable selfsealings guiding valve, regulating system is provided with throttle valve, modulating valve.
Shown in Fig. 6 is, often while closing self-sealed guiding valve open, manually or electric opening throttle valve 8, modulating valve 9, control flow with throttle valve 9, regulate pressure with modulating valve 9, when regulating pressure while being greater than the elastic force of spring, guiding valve convex shoulder is moved, after moving to sealing convex shoulder annular seal groove is sealed, sealing convex shoulder is opened and is made valve opening, continue to turn down modulating valve, make to regulate pressure to raise, until valve is all opened.In the time of valve leak, reclaim or pressure sealing through annular seal groove, monitoring closed hole.When throttle down, open modulating valve and close throttle valve, spring moves guiding valve convex shoulder, and sealing convex shoulder seals the mouth of pipe, and when spring force is not enough, open and close valve cuts out guiding valve.Two series valves of closing in service, form sealing chamber in the middle of valve body, can detect valve leak situation by detecting blind hole, as valve leak, leakage rate is little, can recycle from recovery channel pressure release, as need shutoff to leak, can be according to the composition that leaks goods and materials, with not mixing with leaking goods and materials, the not medium-tight of chemical reaction, time out of service, close after two series valves, can carry out bulge test by detecting blind hole.Two series valves can be set to a normally closed open in usual.Can open simultaneously or close, also can operation of a standard-sized sheet, realize the using and the reserved.
Close while often driving self-sealed guiding valve, as self-pressure quick closedown, valve inlet side pressure is drawn, through shut electromagnetic valve, handle hole enters valve body, pressure is greater than the elastic force of spring, guiding valve convex shoulder is moved, sealing convex shoulder seals the mouth of pipe, sealing convex shoulder and sealing convex shoulder and sealing convex shoulder and guide bulge respectively form sealing chamber, on valve body, offer seal therewith that chamber communicates detect at least together blind hole, can detect valve leak situation by detecting blind hole, as valve leak, leakage rate is little, can recycle from recovery channel pressure release, as need shutoff to leak, can be according to the composition that leaks goods and materials, with not mixing with leakage goods and materials, the not medium-tight of chemical reaction, time out of service, close after guiding valve, can carry out bulge test by detecting blind hole.In the time that need are opened valve, shut electromagnetic valve is closed and pressure release, spring moves guiding valve convex shoulder, sealing convex shoulder seals the mouth of pipe, when spring force is not enough, opening opens solenoid valve opens guiding valve, convex shoulder seals annular seal groove, in the time of valve leak, reclaims or pressure sealing through annular seal groove, monitoring closed hole.
Regulative mode in Fig. 6, not only can be used for embodiment 2 also can be for embodiment 1 and embodiment 3.
Fig. 5 is that handwheel is manually controlled, and valve two end cap is provided with through hole for pressure release.
Embodiment 3
Shown in Fig. 7, a kind of selfsealings guiding valve, comprises valve body, is provided with two valve openings in valve body, in each valve opening, slides and is provided with spool, and this spool can adopt the form of embodiment 1 or embodiment's 2 convex shoulder.
Between two valve openings, be provided with valve through hole 10, for being communicated with two valve openings, be positioned at the outlet that is communicated with respectively valve body and the entrance of outermost two spools.
In the time of valve opening formation corresponding to convex shoulder closed condition, between adjacent two spools and valve through hole 10, form seal space, seal space connection is provided with leak hunting aperture 11 therewith.
When use, the present embodiment 3 can be opened simultaneously or close simultaneously, also can be in the time losing efficacy for one, and another is as for subsequent use; When both close simultaneously, strengthen sealing effect, and be particularly useful for the leak detection of toxic and harmful pipeline, be provided with twice valve, the shrouding of setting up after second valve is also just equivalent to first valve to cut out, but than the existing shrouding that installs additional in addition, the one, do not destroy original valve arrangement, the 2nd, operate especially simple and there is good sealing effect.
Claims (12)
1. a selfsealings guiding valve, it is characterized in that: comprise valve body, valve body is provided with at least one valve opening, in each valve opening, slide and be provided with a spool, described spool at least comprises a convex shoulder, the inwall fitted seal of the outer wall of convex shoulder and valve opening, the both sides of valve body are respectively equipped with entrance and the outlet of leading to valve opening; When spool slides into the entrance of convex shoulder and valve body and exports at once, valve body is closed, otherwise, valve body conducting.
2. selfsealings guiding valve according to claim 1, is characterized in that: described convex shoulder at least comprises the sealing convex shoulder and the sealing convex shoulder that are positioned at two ends; Between sealing convex shoulder and sealing convex shoulder, it is connecting rod.
3. selfsealings guiding valve according to claim 1 and 2, it is characterized in that: valve body is provided with at least two valve openings, in each valve opening, slide and be provided with the spool that includes convex shoulder, adjacent two spools are communicated with by valve through hole, are positioned at the outlet that is communicated with respectively valve body and the entrance of two spools of outermost one-level.
4. selfsealings guiding valve according to claim 3, is characterized in that: in the time of valve opening formation corresponding to convex shoulder closed condition, between adjacent two spools and through hole, form seal space, seal space connection is provided with leak hunting aperture therewith.
5. selfsealings guiding valve according to claim 1 and 2, is characterized in that: at least one end of spool is provided with the end cap corresponding with spool, and the end face of end cap and spool and valve body form seal space; These selfsealings guiding valve also includes the drive unit that makes valve core movement.
6. selfsealings guiding valve according to claim 5, is characterized in that: described drive unit is at least one through hole of being located on valve body or end cap, and one end of through hole communicates with seal space, and the other end is connected with relief tube or hydraulic system.
7. selfsealings guiding valve according to claim 5, is characterized in that: described drive unit is Compress Spring.
8. selfsealings guiding valve according to claim 2, is characterized in that: the offside that is provided with connecting rod of spool sealing convex shoulder is provided with the second connecting rod, and the other end of the second connecting rod is connected with guide bulge, and the outer wall of guide bulge coordinates with valve body slipper seal.
9. selfsealings guiding valve according to claim 1 and 2, is characterized in that: the both sides that are positioned at valve outlet, entrance on described valve body are respectively provided with at least one and are positioned at the annular groove of valve opening, are at least provided with a detection hole that annular groove communicates therewith on valve body.
10. selfsealings guiding valve according to claim 9, is characterized in that: the position of described annular groove meets: valve body is closed: the outlet of the sealing shaft shoulder and valve body and entrance are at once, and annular groove is positioned at the outside of the sealing shaft shoulder.
11. selfsealings guiding valves according to claim 3, is characterized in that: be connected with solenoid valve with described through hole, the entrance of solenoid valve and pipeline communication.
12. selfsealings guiding valves according to claim 6, it is characterized in that: described hydraulic system comprises emulsion box, emulsion box is connected with throttle valve through pump, and the outlet of throttle valve is parallel with the through hole of modulating valve and end cap, and the other end of modulating valve flows back to emulsion box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420069550.4U CN203823104U (en) | 2014-02-18 | 2014-02-18 | Self-sealing slide valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420069550.4U CN203823104U (en) | 2014-02-18 | 2014-02-18 | Self-sealing slide valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203823104U true CN203823104U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420069550.4U Expired - Fee Related CN203823104U (en) | 2014-02-18 | 2014-02-18 | Self-sealing slide valve |
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| Country | Link |
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| CN (1) | CN203823104U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836220A (en) * | 2014-02-18 | 2014-06-04 | 潘健 | Self-sealing slide valve |
| CN105782545A (en) * | 2016-05-13 | 2016-07-20 | 浙江工业大学 | Two-position and two-way electromagnetic valve |
| CN111365500A (en) * | 2020-04-03 | 2020-07-03 | 宁波市润桥工业设计有限公司 | Pressure control valve |
| CN112696503A (en) * | 2021-01-06 | 2021-04-23 | 西南石油大学 | Ultrahigh-temperature-resistant high-pressure air brake valve |
| CN114568098A (en) * | 2022-03-23 | 2022-06-03 | 重庆丘勤农业开发有限公司 | Pear tree fertilizer injection unit |
-
2014
- 2014-02-18 CN CN201420069550.4U patent/CN203823104U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836220A (en) * | 2014-02-18 | 2014-06-04 | 潘健 | Self-sealing slide valve |
| CN105782545A (en) * | 2016-05-13 | 2016-07-20 | 浙江工业大学 | Two-position and two-way electromagnetic valve |
| CN111365500A (en) * | 2020-04-03 | 2020-07-03 | 宁波市润桥工业设计有限公司 | Pressure control valve |
| CN111365500B (en) * | 2020-04-03 | 2021-09-10 | 宁波市润桥工业设计有限公司 | Pressure control valve |
| CN112696503A (en) * | 2021-01-06 | 2021-04-23 | 西南石油大学 | Ultrahigh-temperature-resistant high-pressure air brake valve |
| CN114568098A (en) * | 2022-03-23 | 2022-06-03 | 重庆丘勤农业开发有限公司 | Pear tree fertilizer injection unit |
| CN114568098B (en) * | 2022-03-23 | 2023-09-19 | 重庆丘勤农业开发有限公司 | Pear tree fertilizer injection unit |
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Granted publication date: 20140910 Termination date: 20220218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |