CN104976418A - Flow regulating valve throttling element, valve sleeve of flow regulating valve and flow regulating valve - Google Patents
Flow regulating valve throttling element, valve sleeve of flow regulating valve and flow regulating valve Download PDFInfo
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- CN104976418A CN104976418A CN201510368445.XA CN201510368445A CN104976418A CN 104976418 A CN104976418 A CN 104976418A CN 201510368445 A CN201510368445 A CN 201510368445A CN 104976418 A CN104976418 A CN 104976418A
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- throttling element
- valve
- fluid
- flow control
- control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
- F16K47/12—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths the throttling channel being of helical form
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a flow regulating valve throttling element which comprises a cylindrical throttling element body. An outer wall of the throttling element body is provided with a spiral groove for reducing the flow velocity of fluid, one end face of the throttling element body is provided with a fluid inlet for the fluid to flow into the spiral groove, and the other end face of the throttling element body is provided with a fluid outlet for the fluid to flow out of the spiral groove. The throttling element can decelerate the fluid and reduce the pressure of the fluid so as to effectively achieve the goal of throttling. The invention further discloses a valve sleeve of a flow regulating valve. The valve sleeve comprises the flow regulating valve throttling element. The external fluid can be effectively led into the valve sleeve after being decelerated and depressurized through the throttling element, and the goal of throttling is effectively achieved. The invention further discloses the flow regulating valve which comprises the valve sleeve of the flow regulating valve. The flow regulating valve can effectively prevent the fluid in a high-speed and high-pressure state from damaging the sealing surfaces of a valve core and a valve seat and prolong service life.
Description
Technical field
The invention belongs to flow control valve technical field, specifically relate to a kind of flow control valve throttling element, flow control valve valve pocket and flow control valve.
Background technique
The known modulating valve of existing majority, it is in flow field and is easy to produce vibration & noise; When small guide vane, the pressure drop of valve place is maximum, and it is the most outstanding that vibration & noise also shows; Often with there is cavitation, erosion phenomenon, valve internal component sealing surface is caused to damage at short notice.There is multiple labyrinth speed limit throttling arrangement now both at home and abroad, the speed limit throttling arrangement of this kind of mazy type or Cascade is not only easy to blocking, and after using a period of time, erosion is also very serious.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of flow control valve throttling element is provided.This flow control valve throttling element can slow down by convection cell, and then the pressure of fluid is reduced, and effectively achieves throttling object, and can reduce cavitation phenomenon and erosion phenomenon.
For achieving the above object, the technological scheme that inventive flow modulating valve throttling element adopts is: a kind of flow control valve throttling element, it is characterized in that: comprise cylindrical throttling element body, the outer wall of described throttling element body offers the spiral groove for reducing rate of flow of fluid, one end face of described throttling element body offers the fluid inlet entering described spiral groove for fluid, and the other end of described throttling element body offers the fluid output flowing out described spiral groove for fluid.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: described spiral groove comprises multiple reaming along the laying of its Hand of spiral interval and multiple groove section adjacent two described reamings be communicated with along the Hand of spiral of described spiral groove.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: described reaming is circular port.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: the aperture of described reaming is greater than the groove width of described groove section.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: the hole depth of described reaming is greater than the groove depth of described groove section.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: the quantity of described fluid inlet is two, and two described fluid inlets are communicated with two reaming one_to_one corresponding near described throttling element body one end face; The quantity of described fluid output is two, and two described fluid outputs are communicated with two reaming one_to_one corresponding near described throttling element body other end.
Above-mentioned a kind of flow control valve throttling element, is characterized in that: the quantity of described reaming is 19, and the quantity of described groove section is 18.
Present invention also offers a kind of flow control valve valve pocket.External fluid can effectively be slowed down through described throttling element by this flow control valve valve pocket, be incorporated into orifice sleeve inner chamber after step-down, effectively achieves throttling object.
For achieving the above object, the technological scheme that inventive flow modulating valve valve pocket adopts is: a kind of flow control valve valve pocket, it is characterized in that: comprise orifice sleeve and multiple above-mentioned throttling element, the sidewall of described orifice sleeve offers multiple throttling element mounting hole and multiple intercommunicating pore for being communicated with described throttling element mounting hole and orifice sleeve inner chamber, multiple described throttling element mounting hole and multiple described intercommunicating pore one_to_one corresponding, multiple described throttling element one_to_one corresponding is arranged in described throttling element mounting hole, spiral fluid passageways is formed between the inwall of the spiral groove on described throttling element and described throttling element mounting hole.
Above-mentioned a kind of flow control valve valve pocket, is characterized in that: described intercommunicating pore and the connectivity part of throttling element mounting hole are provided with the stop shoulder for coordinating with described throttling element one end end contact.
Invention also improves a kind of flow control valve.This flow control valve effectively anti-fluid can cause damage to the sealing surface of spool and valve seat under high speed and high pressure state, improves working life.
For achieving the above object, the technological scheme that inventive flow modulating valve valve pocket adopts is: a kind of flow control valve, comprise valve body, bonnet, spool, valve seat and valve rod, uuper valve chamber is provided with in described valve body, lower valve chamber, and the inlet passage to be communicated with described uuper valve chamber and the outlet passage be communicated with described lower valve chamber, described spool is connected with described valve rod, described valve seat is arranged in described uuper valve chamber, it is characterized in that: in described uuper valve chamber, between valve seat and bonnet, position is provided with above-mentioned flow control valve valve pocket, described spool is arranged in described flow control valve valve pocket.
The present invention compared with prior art has the following advantages:
1, throttling element of the present invention is by arranging spiral groove, can and the throttling element mounting hole hole wall of flow control valve valve pocket between form spiral fluid passageways, under making fluid constantly change the effect of direction, prolongation fluid circulating path through described spiral fluid passageways when flowing, achieve the object that convection cell slows down, and then the pressure of fluid is reduced, effectively achieve throttling object.
2, the spiral groove of throttling element of the present invention is made up of reaming and groove section, fluid reduces from described groove section flow velocity after described reaming is due to space amplification, by multiple groove section and this over-over mode of multiple reaming, convection cell can be realized and carry out multi-stage speed-reducing, thus effectively realize hypotensive effect.
3, external fluid effectively can slow down through described throttling element, be incorporated into orifice sleeve inner chamber after step-down by inventive flow modulating valve valve pocket, due to the particular design to spiral groove on described throttling element, further increase the deceleration of convection cell, hypotensive effect, thus effectively achieve throttling object further.
4, inventive flow modulating valve is by arranging the described flow control valve valve pocket with throttling element, external fluid can effectively be slowed down through described throttling element by this flow control valve valve pocket, be incorporated into orifice sleeve inner chamber after step-down, thus the effective throttling object realized, can effectively anti-fluid under high speed and high pressure state, because of cavitation phenomenon and erosion phenomenon, the sealing surface to spool and valve seat causes damage, improve the working life of this flow control valve.
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of flow control valve throttling element in the embodiment of the present invention 1.
Fig. 2 is the stereogram of flow control valve throttling element in the embodiment of the present invention 1.
Fig. 3 is the structural representation of flow control valve valve pocket in the embodiment of the present invention 1.
Fig. 4 is the structural representation of the orifice sleeve of flow control valve valve pocket in the embodiment of the present invention 1.
Fig. 5 is the structural representation of flow control valve in the embodiment of the present invention 1.
Fig. 6 is the structural representation of flow control valve throttling element in the embodiment of the present invention 2.
Fig. 7 is the stereogram of flow control valve throttling element in the embodiment of the present invention 2.
Fig. 8 is the structural representation of flow control valve valve pocket in the embodiment of the present invention 2.
Fig. 9 is the structural representation of flow control valve in the embodiment of the present invention 2.
Description of reference numerals:
1-throttling element; 1-1-throttling element body; 1-2-spiral groove;
1-2-1-reaming; 1-2-2-groove section; 1-3-fluid inlet;
1-4-fluid output; 2-orifice sleeve; 2-1-intercommunicating pore;
2-2-throttling element mounting hole; 2-3-orifice sleeve inner chamber; 2-4-stop shoulder;
3-valve body; 4-spool; 5-outlet passage;
6-valve rod; 7-bonnet; 8-inlet passage;
9-valve seat; 10-uuper valve chamber; 11-lower valve chamber.
Embodiment
Embodiment 1
A kind of flow control valve throttling element as depicted in figs. 1 and 2, comprise cylindrical throttling element body 1-1, the outer wall of described throttling element body 1-1 offers the spiral groove 1-2 for reducing rate of flow of fluid, one end face of described throttling element body 1-1 offers the fluid inlet 1-3 entering described spiral groove 1-2 for fluid, and the other end of described throttling element body 1-1 offers the fluid output 1-4 flowing out described spiral groove 1-2 for fluid.
A kind of flow control valve valve pocket as shown in Figure 3, comprise orifice sleeve 2 and the throttling element described in multiple the present embodiment 1, the sidewall of described orifice sleeve 2 offers multiple throttling element mounting hole 2-2 and multiple intercommunicating pore 2-1 for being communicated with described throttling element mounting hole 2-2 and orifice sleeve inner chamber 2-3, multiple described throttling element mounting hole 2-2 and multiple described intercommunicating pore 2-1 one_to_one corresponding, multiple described throttling element 1 one_to_one corresponding is arranged in described throttling element mounting hole 2-2, spiral fluid passageways is formed between the inwall of the spiral groove 1-2 on described throttling element 1 and described throttling element mounting hole 2-2.
In the present embodiment, this throttling element 1 is arranged in the throttling element mounting hole 2-2 of this flow control valve valve pocket in use, due to the spiral fluid passageways formed between described spiral groove 1-2 and throttling element mounting hole 2-2 hole wall, so, when fluid enters described spiral groove 1-2 from described fluid inlet 1-3, fluid flows into intercommunicating pore 2-1 from described fluid output 1-4 after the guiding of described spiral fluid passageways, then flows to orifice sleeve inner chamber 2-3 by described intercommunicating pore 2-1.
In the present embodiment, this throttling element 1 is by arranging spiral groove 1-2, can and the throttling element mounting hole 2-2 hole wall of flow control valve valve pocket between form spiral fluid passageways, under making fluid constantly change the effect of direction, prolongation fluid circulating path through described spiral fluid passageways when flowing, achieve the object that convection cell slows down, and then the pressure of fluid is reduced, effectively achieve throttling object.
In the present embodiment, external fluid can effectively be slowed down through described throttling element 1 by this flow control valve valve pocket, orifice sleeve inner chamber 2-3 is incorporated into after step-down, effectively achieve throttling object, and, because the groove width of spiral groove 1-2 on described throttling element 1 is much smaller than the aperture of throttling element mounting hole 2-2, so the impurity in fluid cannot enter described spiral groove 1-2, and then effectively will the impurity of greater particle size be blocked in outside this flow control valve valve pocket in fluid, and the impurity that in fluid, particle diameter is less can flow out from throttling element 1 along with spiral groove 1-2, throttling element 1 can not be caused to block.That is, multiple throttling elements 1 on this flow control valve valve pocket form a kind of special filter screen, the fluid entering this flow control valve valve pocket effectively can be filtered, can't result in blockage, guarantee that this flow control valve valve pocket remains on effective working state.
As shown in Figure 4, described intercommunicating pore 2-1 and the connectivity part of throttling element mounting hole 2-2 are provided with the stop shoulder 2-4 for coordinating with described throttling element 1 one end end contact.By arranging stop shoulder 2-4, effectively can locate described throttling element 1, when fluid enters described throttling element 1, described throttling element 1 not only can not produce movement, and under the active force of fluid, what described throttling element 1 can be firm is positioned in described throttling element mounting hole 2-2.
A kind of flow control valve as shown in Figure 5, comprise valve body 3, bonnet 7, spool 4, valve seat 9 and valve rod 6, uuper valve chamber 10, lower valve chamber 11 and the inlet passage 8 be communicated with described uuper valve chamber 10 and the outlet passage 5 be communicated with described lower valve chamber 11 is provided with in described valve body 3, described spool 4 is connected with described valve rod 6, described valve seat 9 is arranged in described uuper valve chamber 10, in described uuper valve chamber 10, between valve seat 9 and bonnet 7, position is provided with the flow control valve valve pocket described in the present embodiment, and described spool 4 is arranged in described flow control valve valve pocket.
In the present embodiment, this flow control valve in use, be with on movable valve plug 4 by valve rod 6 and move, now fluid enters uuper valve chamber 10 through inlet passage 8, then described flow control valve valve pocket is entered, next flow into lower valve chamber 11 from the orifice sleeve inner chamber 2-3 of described flow control valve valve pocket, flow out finally by outlet passage 5.
In the present embodiment, this flow control valve has the described flow control valve valve pocket of throttling element 1 by arranging, external fluid can effectively be slowed down through described throttling element 1 by this flow control valve valve pocket, be incorporated into orifice sleeve inner chamber 2-3 after step-down, thus the effective throttling object realized, can effectively anti-fluid under high speed and high pressure state, because of cavitation phenomenon and erosion phenomenon, the sealing surface (in namely as Fig. 5 A place) to spool 4 and valve seat 9 causes damage, improve the working life of this flow control valve.
Embodiment 2
A kind of flow control valve throttling element as shown in Figure 6 and Figure 7, the difference of the flow control valve throttling element in the present embodiment and the flow control valve throttling element in embodiment 1 is: described spiral groove 1-2 comprises multiple reaming 1-2-1 laid along its Hand of spiral interval and multiple groove section 1-2-2 be communicated with by adjacent two described reaming 1-2-1 along the Hand of spiral of described spiral groove 1-2.
A kind of flow control valve valve pocket as shown in Figure 8, the difference of the flow control valve valve pocket in the present embodiment and the flow control valve valve pocket in embodiment 1 is: described flow control valve valve pocket adopts the throttling element 1 described in the present embodiment.
In the present embodiment, this throttling element 1 is arranged in the throttling element mounting hole 2-2 of this flow control valve valve pocket in use, due to the spiral fluid passageways formed between described spiral groove 1-2 and throttling element mounting hole 2-2 hole wall, so, when fluid enters described spiral groove 1-2 from described fluid inlet 1-3, fluid through described spiral fluid passageways guiding and alternately across multiple described groove section 1-2-2 and multiple described reaming 1-2-1, then flow into intercommunicating pore 2-1 from described fluid output 1-4, finally flow to orifice sleeve inner chamber 2-3 by described intercommunicating pore 2-1.
In the present embodiment, the spiral groove 1-2 of this throttling element 1 is made up of reaming 1-2-1 and groove section 1-2-2, described fluid reduces from described groove section 1-2-2 flow velocity after described reaming 1-2-1 is due to space amplification, by multiple groove section 1-2-2 and this over-over mode of multiple reaming 1-2-1, convection cell can be realized and carry out multi-stage speed-reducing, thus effectively realize hypotensive effect.
In the present embodiment, external fluid can effectively be slowed down through described throttling element 1 by this flow control valve valve pocket, be incorporated into orifice sleeve inner chamber 2-3 after step-down, due to the particular design to spiral groove 1-2 on described throttling element 1, further increase the deceleration of convection cell, hypotensive effect, thus effectively achieve throttling object further.
As shown in Figure 6 and Figure 7, described reaming 1-2-1 is circular port.The aperture of described reaming 1-2-1 is greater than the groove width of described groove section 1-2-2.Described reaming 1-2-1 is designed to circular port, can effectively avoids impurity to remain in bottom reaming 1-2-1.
In the present embodiment, the hole depth of described reaming 1-2-1 is greater than the groove depth of described groove section 1-2-2.The space of reaming 1-2-1 store fluid is increased, thus reduce further liquid speed.
As shown in Figure 7, the quantity of described fluid inlet 1-3 is two, and two described fluid inlet 1-3 are communicated with two reaming 1-2-1 one_to_one corresponding near described throttling element body 1-1 mono-end face; The quantity of described fluid output 1-4 is two, and two described fluid output 1-4 are communicated with two reaming 1-2-1 one_to_one corresponding near described throttling element body 1-1 other end.In the present embodiment, by arranging two fluid inlet 1-3 and two fluid output 1-4, effectively can ensure that influx and the discharge of throttling element 1, the desultory phenomenon of flow can not be caused because the too small and discharge of influx is too small.
In described throttling element 1 in the present embodiment, the quantity of described reaming 1-2-1 is 19, and the quantity of described groove section 1-2-2 is 18.Like this, described throttling element 1 can carry out 37 grades of deceleration step-downs for fluid, and antihypertensive effect is best.
A kind of flow control valve as shown in Figure 9, the difference of the flow control valve in the flow control valve in the present embodiment and embodiment 1 is: this flow control valve comprises the flow control valve valve pocket described in the present embodiment.
In the present embodiment, this flow control valve can further effective anti-fluid under high speed and high pressure state, because of cavitation phenomenon and erosion phenomenon, the sealing surface (in namely as Fig. 9 B place) to spool 4 and valve seat 9 causes damage, effectively raise the working life of this flow control valve further.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solution of the present invention.
Claims (9)
1. a flow control valve throttling element, it is characterized in that: comprise cylindrical throttling element body (1-1), the outer wall of described throttling element body (1-1) offers the spiral groove (1-2) for reducing rate of flow of fluid, one end face of described throttling element body (1-1) offers the fluid inlet (1-3) entering described spiral groove (1-2) for fluid, and the other end of described throttling element body (1-1) offers the fluid output (1-4) flowing out described spiral groove (1-2) for fluid.
2. a kind of flow control valve throttling element according to claim 1, is characterized in that: described spiral groove (1-2) comprises multiple reaming (1-2-1) along the laying of its Hand of spiral interval and multiple groove section (1-2-2) adjacent two described reamings (1-2-1) be communicated with along the Hand of spiral of described spiral groove (1-2).
3. a kind of flow control valve throttling element according to claim 2, is characterized in that: described reaming (1-2-1) is circular port, and the aperture of described reaming (1-2-1) is greater than the groove width of described groove section (1-2-2).
4. a kind of flow control valve throttling element according to claim 2, is characterized in that: the hole depth of described reaming (1-2-1) is greater than the groove depth of described groove section (1-2-2).
5. a kind of flow control valve throttling element according to claim 2, it is characterized in that: the quantity of described fluid inlet (1-3) is two, two described fluid inlets (1-3) are communicated with two reaming (1-2-1) one_to_one corresponding near described throttling element body (1-1) end face; The quantity of described fluid output (1-4) is two, and two described fluid outputs (1-4) are communicated with two reaming (1-2-1) one_to_one corresponding near described throttling element body (1-1) other end.
6. a kind of flow control valve throttling element according to claim 2, is characterized in that: the quantity of described reaming (1-2-1) is 19, and the quantity of described groove section (1-2-2) is 18.
7. a flow control valve valve pocket, it is characterized in that: comprise orifice sleeve (2) and multiple throttling element (1) as described in claim arbitrary in claim 1 to 6, the sidewall of described orifice sleeve (2) offers multiple throttling element mounting hole (2-2) and multiple intercommunicating pore (2-1) for being communicated with described throttling element mounting hole (2-2) and orifice sleeve inner chamber (2-3), multiple described throttling element mounting hole (2-2) and multiple described intercommunicating pore (2-1) one_to_one corresponding, multiple described throttling element (1) one_to_one corresponding is arranged in described throttling element mounting hole (2-2), spiral fluid passageways is formed between spiral groove (1-2) on described throttling element (1) and the inwall of described throttling element mounting hole (2-2).
8. a kind of flow control valve valve pocket according to claim 7, is characterized in that: described intercommunicating pore (2-1) and the connectivity part of throttling element mounting hole (2-2) are provided with the stop shoulder (2-4) for coordinating with described throttling element (1) one end end contact.
9. a flow control valve, comprise valve body (3), bonnet (7), spool (4), valve seat (9) and valve rod (6), uuper valve chamber (10) is provided with in described valve body (3), lower valve chamber (11), and the inlet passage (8) to be communicated with described uuper valve chamber (10) and the outlet passage (5) be communicated with described lower valve chamber (11), described spool (4) is connected with described valve rod (6), described valve seat (9) is arranged in described uuper valve chamber (10), it is characterized in that: be positioned at position between valve seat (9) and bonnet (7) in described uuper valve chamber (10) and be provided with flow control valve valve pocket as claimed in claim 7, described spool (4) is arranged in described flow control valve valve pocket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368445.XA CN104976418B (en) | 2015-06-29 | 2015-06-29 | A kind of flow control valve throttling element, flow control valve valve pocket and flow control valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368445.XA CN104976418B (en) | 2015-06-29 | 2015-06-29 | A kind of flow control valve throttling element, flow control valve valve pocket and flow control valve |
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| CN104976418A true CN104976418A (en) | 2015-10-14 |
| CN104976418B CN104976418B (en) | 2018-10-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396384A (en) * | 2020-04-08 | 2020-07-10 | 重庆凯瑞汽车试验设备开发有限公司 | Plug-in throttle valve group for pull rod type static pressure oil cylinder |
| CN112081994A (en) * | 2020-09-25 | 2020-12-15 | 华中科技大学 | Axial rotation angle opposite-flushing throttling element and application thereof |
| CN112524267A (en) * | 2020-11-18 | 2021-03-19 | 重庆川仪调节阀有限公司 | Black water regulating valve assembly |
| CN113187951A (en) * | 2021-04-26 | 2021-07-30 | 中国船舶重工集团公司第七0三研究所 | Throttle and noise reduction filter screen regulating valve |
| CN116067556A (en) * | 2021-11-04 | 2023-05-05 | 精量电子（深圳）有限公司 | Seal pin, pressure detection module and pressure sensor |
| CN116136160A (en) * | 2023-04-19 | 2023-05-19 | 贵州航天凯山石油仪器有限公司 | Valve and method for controlling underground carbon dioxide flow |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396384A (en) * | 2020-04-08 | 2020-07-10 | 重庆凯瑞汽车试验设备开发有限公司 | Plug-in throttle valve group for pull rod type static pressure oil cylinder |
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| CN113187951A (en) * | 2021-04-26 | 2021-07-30 | 中国船舶重工集团公司第七0三研究所 | Throttle and noise reduction filter screen regulating valve |
| CN116067556A (en) * | 2021-11-04 | 2023-05-05 | 精量电子（深圳）有限公司 | Seal pin, pressure detection module and pressure sensor |
| CN116136160A (en) * | 2023-04-19 | 2023-05-19 | 贵州航天凯山石油仪器有限公司 | Valve and method for controlling underground carbon dioxide flow |
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| CN104976418B (en) | 2018-10-30 |
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