CN204082735U - Numeral selector valve - Google Patents
Numeral selector valve Download PDFInfo
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- CN204082735U CN204082735U CN201420394612.9U CN201420394612U CN204082735U CN 204082735 U CN204082735 U CN 204082735U CN 201420394612 U CN201420394612 U CN 201420394612U CN 204082735 U CN204082735 U CN 204082735U
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Abstract
The utility model relates to a kind of digital selector valve.Lower for solving solenoid directional control valve frequency response, and usage ratio directional control valve and servovalve noise is large, cost is high problem, the utility model proposes a kind of digital selector valve, comprise valve body, spool and two electromagnetic actuator devices.An oil suction chamber, two working oil chambers and an oil back chamber is provided with in valve body; Valve body is provided with four hydraulic fluid ports, respectively corresponding oil suction chamber, two working oil chambers and oil back chamber; Spool is arranged on the middle part in valve body, and both sides are respectively provided with a push rod, and electromagnetic actuator device is arranged on valve body both sides; The inner walls of electromagnetic actuator device is provided with buffering resilience pad.The utility model numeral selector valve speed of response is very fast, and buffering resilience pad is when contacting with the spool of high-speed motion, can produce buffering spring-back force, accelerate the speed of response of spool, eliminate spool and valve interior wall collides the noise produced, and extend the working life of digital selector valve.
Description
Technical field
The utility model relates to a kind of position control valve, particularly relate to a kind of can the digital selector valve in fast switching system working medium direction.
Background technique
Position control valve is the valve of liquid flow path direction in hydraulic control system, is used for carrying out the liquid stream of each branch road in system the switching of switching, to adapt to the demand of work.In the various control valves applied in a hydraulic system, position control valve occupies very large proportion.The basic role of conventional position control valve carries out switching switching to liquid stream, and therefore working principle is comparatively simple, and structure is also uncomplicated.But in order to satisfied different hydraulic system is to the control overflow of liquid flow path direction, the description item of directional control valve are more.Selector valve is as a kind of common position control valve, and its working principle is connection by means of changing between several oil circuits that the position of spool realizes being connected with valve body or disconnection.
Nowadays, the industrial selector valve generally used has hand-operated direction valve, solenoid directional control valve, proportional reversing valve and electro-hydraulic reversing valve etc.Wherein, solenoid directional control valve is lower due to its price, controls convenient and stability is higher, and therefore using scope is the widest.But the frequency response time of solenoid directional control valve can only reach hundreds of millisecond the soonest, under the occasion needing high frequency sound and continuous control for a long time, can only choice for use proportional direction valve or servovalve.But the cost of proportional direction valve and servovalve comparatively solenoid directional control valve is high, and under the occasion of high frequency sound and continuous control break-make, usage ratio directional control valve and servovalve can produce larger noise, and cause the normal operation of the effect of attrition system of spool, therefore need frequent replacing, add the cost of system running.
Model utility content
Lower for solving solenoid directional control valve frequency response, and usage ratio directional control valve and servovalve noise is large, cost is high problem, the utility model proposes a kind of digital selector valve, this digital selector valve comprises valve body, spool and two electromagnetic actuator devices;
Described valve body is long column shape hollow structure, its inside is provided with the cylindric through hole running through these valve body left and right sides, and this through-hole wall is provided with an oil suction chamber, two working oil chambers and two oil back chambers, described oil suction chamber is arranged in the middle part of described valve body, oil suction chamber be each side provided with a described working oil chamber, described working oil chamber is adjacent with described oil back chamber with described oil suction chamber, and two described oil back chambers are interconnected by drainback passage; Described oil suction chamber, two described working oil chambers and two described oil back chambers are annular undercut groove and the ring surface of these five oil pockets parallels with the left and right side of described valve body, and center be all positioned at run through these valve body left and right sides central axis on; Described valve body is provided with four hydraulic fluid ports, respectively corresponding described oil suction chamber, two described working oil chambers and described oil back chamber;
Described spool is column structure, comprise the identical block section of two sizes and three Connectivity Sections, described block section and interval, Connectivity Section are arranged, and make each block section adjacent with Connectivity Section, and the length of Connectivity Section between described block section is identical with the distance between two described working oil chambers; The diameter of described block section is identical with the diameter of described valve body inner via hole, and the diameter of described Connectivity Section is less than the diameter of described block section; Described spool is arranged on the middle part in described valve body, and the central axis running through these two ends, spool left and right coincides with the central axis running through described valve body left and right sides, and described spool two ends are respectively provided with a push rod;
Described electromagnetic actuator device comprises a housing, and two electromagnet be oppositely arranged in described housing and the permanent magnet be arranged between these two electromagnet, the housing of described electromagnetic actuator device can match with the through hole on described valve body, be separately positioned on described valve body both sides, and one end of described permanent magnet is connected with described push rod, when described valve core movement is to two ends extreme position, can contact with the inwall of described housing, be provided with buffering resilience pad at this inwall place.
When the equal no electric circuit of two ends electromagnetic actuator device, two electromagnet in described electromagnetic actuator device do not produce magnetic force, and the permanent magnet be arranged between this two electromagnet is attached together.
When the energising of left end electromagnetic actuator device during the power-off of right-hand member electromagnetic actuator device, two electromagnet be arranged in left end electromagnetic actuator device produce magnetic force, attract each other, and the permanent magnet repulsion be arranged between this two electromagnet is gone out, thus the push rod be arranged on the left of described spool is promoted by this permanent magnet, described spool is made to move right to the buffering resilience pad place in the inner walls being arranged on right side electromagnetic actuator device, now, described spool left connection section is positioned at the part between the described through hole described working oil chamber in left side and described oil back chamber, and the part shutoff of described through hole between the described working oil chamber in left side and described oil suction chamber is got up by the left block section of described spool, make the working medium in the described working oil chamber in left side can flow into described oil back chamber, the described working oil chamber in left side is communicated with described oil back chamber, simultaneously, the intermediate connection section of described spool is positioned at the part between the described working oil chamber of the described oil suction chamber of described through hole and right side, and the part shutoff of described through hole between the described working oil chamber in right side and described oil back chamber is got up by the right block section of described spool, make the working medium in described oil suction chamber can flow into the described working oil chamber in right side, described oil suction chamber is communicated with the described working oil chamber in right side.
Then by the power-off of left end electromagnetic actuator device and when right-hand member electromagnetic actuator device is energized, two electromagnet be arranged in right-hand member electromagnetic actuator device produce magnetic force, attract each other, and the permanent magnet repulsion be arranged between this two electromagnet is gone out, thus make this permanent magnet produce a thrust to the push rod be arranged on the right side of described spool, and collide with the buffering resilience pad be arranged in the inner walls of electromagnetic actuator device on the right side of spool the spring-back force produced to during extreme right position place with described valve core movement, the described spool of common promotion is moved to the left the buffering resilience pad place in the inner walls being arranged on left side electromagnetic actuator device, now, the intermediate connection section of described spool is positioned at the part between the described working oil chamber of the described oil suction chamber of described through hole and left side, and the part shutoff of described through hole between the described working oil chamber in left side and described oil back chamber is got up by the left block section of described spool, make the working medium in described oil suction chamber can flow in the described working oil chamber in left side, described oil suction chamber is communicated with the described working oil chamber in left side, simultaneously, the part of right Connectivity Section in described through hole between the described working oil chamber in right side and described oil back chamber of described spool, and the part shutoff of described through hole between the described working oil chamber in right side and described oil suction chamber is got up by the right block section of spool, make the working medium in the described working oil chamber in right side can flow into described oil back chamber, the described working oil chamber in right side is communicated with described oil back chamber.
Again left end electromagnetic actuator device be energized and to the power-off of right-hand member electromagnetic actuator device, spool moved right.Cycle alternation like this controls, thus realizes the rapid switching function of described digital selector valve, and can not produce noise, and protects described spool well, adds the working life of spool.
Use the utility model numeral selector valve, because buffering resilience pad is clashed into can produce spring-back force by the spool of high-speed motion, this spring-back force and push rod thrust promote spool simultaneously and move to opposite side, accelerate the speed of response of this digital selector valve, and described buffering resilience pad is when contacting with spool described in high-speed motion, certain buffering spring-back force can be produced, the speed of response of described spool is accelerated, simultaneously because buffering resilience pad is flexible material, described spool is with when described buffering resilience pad collides, there will not be noise, eliminate described spool when moving to extreme position and the housing of described electromagnetic actuator device collide the noise produced, avoid described spool and hard metal to collide impaired problem, extend the working life of described spool, thus extend the working life of described digital selector valve.
Preferably, described push rod is Collapsible structure, and one end is fixedly connected with described permanent magnet, and the other end is fixedly connected with one end of described spool.Reduce the size of described digital valve, make described digital valve body when responding, the transmission of described push rod to the spring-back force of the thrust of spool and described buffering resilience pad is more quick, reduces the volume of described digital valve, accelerates the response of digital valve and saved manufacture cost.
Preferably, described digital selector valve adopts secondary voltage control.When the described valve core movement of needs, need the voltage of an applying 24V, make described spool obtain a larger thrust, produce a larger acceleration; When described spool is about to move to limit position, apply the voltage of a 5V, described spool is reentried a less thrust, produce a less acceleration, make described valve core movement can not produce strong collision because speed is excessive to during limit position, thus play the effect accelerated and cushion.
Preferably, described digital selector valve adopts two-level current to control.When the described valve core movement of needs, need the electric current of an applying 10A, make described spool obtain a larger thrust, produce a larger acceleration; When described spool is about to move to limit position, apply the electric current of a 2A, described spool is reentried a less thrust, produce a less acceleration, make described valve core movement can not produce strong collision because speed is excessive to during limit position, thus play the effect accelerated and cushion.
Preferably, described buffering resilience pad is fixedly installed in the inner walls of described electromagnetic actuator device.Avoid described buffering resilience pad to be driven by described spool in the process contacted with described spool, rub with described spool, thus extend the working life of described buffering resilience pad, and ensure that the normal work of described digital selector valve.
Use the utility model numeral selector valve, solenoid directional control valve frequency response can be solved and only can reach hundreds of millisecond and the problem that cannot be used in quick switch operating medium direction, and the cost that usage ratio directional control valve or servovalve bring when switching fast working medium direction is high, noise is large, the problems such as quick abrasion, and use the utility model numeral selector valve time frequency response can reach one millisecond the soonest, and noiseless, working life is longer, make this digital selector valve can be efficient when being applied in hydraulic system the quick switch operating realizing working medium direction, stably carry out work.
Accompanying drawing explanation
Fig. 1 is that the valve core movement of the utility model numeral selector valve is to the cross-sectional schematic during extreme position of right side;
Fig. 2 is the cross-sectional schematic of the utility model numeral change valve stereogram;
Cross-sectional schematic when Fig. 3 is the electromagnetic actuator device no electric circuit of the utility model numeral selector valve.
Embodiment
Embodiment 1
As shown in Figure 1, Figure 2 and Figure 3, the utility model numeral selector valve comprises valve body 1, spool 2 and two electromagnetic actuator devices 3.
Valve body 1 is long column shape hollow structure, its inside is provided with the cylindric through hole 11 running through these valve body 1 left and right sides, and this through-hole wall is provided with an oil suction chamber 12, left working oil chamber 131, right working oil chamber 132, left oil back chamber 141 and right oil back chamber 142, oil suction chamber 12 is arranged on the middle part of valve body 1, the left side of oil suction chamber 12 is provided with left working oil chamber 131, right side is provided with right working oil chamber 132, the left side of left working oil chamber 131 is provided with left oil back chamber 141, right oil back chamber 142 is provided with on the right side of right working oil chamber 132, left oil back chamber 141 is interconnected by drainback passage 143 with right oil back chamber 142, oil suction chamber 12, left working oil chamber 131, right working oil chamber 132, left oil back chamber 141 and right oil back chamber 142 are annular undercut groove, and the ring surface of these five oil pockets parallels with the left and right side of valve body 1, and center be all positioned at run through these valve body 1 left and right sides central axis on, valve body 1 is provided with four hydraulic fluid ports A, P, B, T, respectively corresponding left working oil chamber 131, oil suction chamber 12, right working oil chamber 132 and right oil back chamber 142,
Spool 2 is column structure, comprise left block section 211, right block section 212, left connection section 221, right Connectivity Section 222 and intermediate connection section 223, left block section 211 is identical with the size of right block section 212, the left side of left block section 211 is provided with left connection section 221, the right side of right block section 212 is provided with right Connectivity Section 222, left block section 211 and right block section 212 are coupled together by intermediate connection section 223, and the length of intermediate connection section is identical with the distance between left working oil chamber 131 and right working oil chamber 132; Left block section 211 is identical with the diameter of valve body 1 inner via hole 11 with the diameter of right block section 212, and the diameter of three Connectivity Sections is less than the diameter of block section; Spool 2 is arranged on the middle part in valve body 1, and the central axis running through these spool about 1 two ends coincides with the central axis running through valve body 1 left and right sides, and the two ends of spool 2 are respectively provided with the push rod 23 of a Collapsible structure;
Electromagnetic actuator device 3 comprises a housing 31, and two electromagnet 32 be oppositely arranged in housing 31 and the permanent magnet 33 be arranged between these two electromagnet, the housing 31 of electromagnetic actuator device 3 can match with the two ends of the through hole 11 on valve body 1, valve body 1 both sides are respectively provided with an electromagnetic actuator device 3, and one end of the permanent magnet 33 of electromagnetic actuator device 3 is connected with push rod 23, when spool 2 moves to two ends extreme position, can contact with the inwall of housing 31, this inwall be fixedly installed buffering resilience pad 34.
Preferably, this digital selector valve adopts two-level current to control.Be applied to the larger of the electric current on electromagnet, the thrust that this electromagnet produces spool is larger.The motion of this thrust to spool produces an acceleration, the electric current of the 10A applied during spool setting in motion, larger thrust is created to spool, spool is made to obtain a larger acceleration, when valve core movement is to the electric current of the 2A applied during extreme position, the acceleration of the spool in movement process is reduced, makes valve core movement can not produce strong collision because speed is excessive to during limit position.
When the equal no electric circuit of two ends electromagnetic actuator device, two electromagnet 32 in electromagnetic actuator device 3 do not produce magnetic force, and the permanent magnet 33 be arranged between this two electromagnet 32 is adsorbed on electromagnet 32.
When left end electromagnetic actuator device 3 be energized and 3 power-off of right-hand member electromagnetic actuator device time, two electromagnet 32 be arranged in left end electromagnetic actuator device 3 produce magnetic force, attract each other, and the permanent magnet 33 be arranged between this two electromagnet 32 is repelled away, thus the push rod 23 be arranged on the left of spool 2 is promoted by this permanent magnet 33, spool 2 is made to move right to buffering resilience pad 34 place being arranged on right side, now, the part of left connection section 221 in through hole 11 between left side working oil chamber 131 and oil back chamber 14 of spool 2, and get up in the part shutoff of through hole 11 between left side working oil chamber 131 and oil suction chamber 12 in the left block section 211 of spool 2, make the working medium in the working oil chamber 131 of left side can flow into left oil back chamber 141, left side working oil chamber 131 is communicated with oil back chamber, simultaneously, the part of intermediate connection section 223 in through hole 11 between oil suction chamber 12 and right side working oil chamber 132 of spool 2, and the part shutoff of through hole 11 between right side working oil chamber 132 and oil back chamber 14 is got up by the right block section 212 of spool 2, make the working medium in oil suction chamber 12 can flow into right side working oil chamber 132, oil suction chamber 12 is communicated with right side working oil chamber 132.
Then by left end electromagnetic actuator device 3 power-off and when right-hand member electromagnetic actuator device 3 is energized, two electromagnet 32 be arranged in right-hand member electromagnetic actuator device 3 produce magnetic force, attract each other, and the permanent magnet 33 be arranged between this two electromagnet 32 is repelled away, thus make this permanent magnet 33 produce a thrust to the push rod 23 be arranged on the right side of spool 2, and collide with the buffering resilience pad 34 be arranged on the housing 31 of right side electromagnetic actuator device 3 spring-back force produced when moving to extreme right position place with spool 2, common promotion spool 2 is moved to the left buffering resilience pad 34 place on the housing 31 being arranged on left side electromagnetic actuator device 3, now, the intermediate connection section of spool 2 is positioned at the part between through hole 11 oil suction chamber 12 and left side working oil chamber 131, and the part shutoff of through hole 11 between left side working oil chamber 131 and oil back chamber 14 is got up by the left block section 211 of spool 2, make the working medium in oil suction chamber 12 can flow in the working oil chamber 131 of left side, oil suction chamber 12 is communicated with left side working oil chamber 131, simultaneously, the part of right Connectivity Section 222 in through hole 11 between right side working oil chamber 132 and right oil back chamber 142 of spool 2, and the part shutoff of through hole 11 between right side working oil chamber 132 and oil suction chamber 12 is got up by the right block section 212 of spool 2, make the working medium in the working oil chamber 132 of right side can flow into right oil back chamber 142, right side working oil chamber 132 is communicated with oil back chamber.
Again left end electromagnetic actuator device 3 be energized and to right-hand member electromagnetic actuator device 3 power-off, spool 2 moved right.Cycle alternation like this controls, thus realizes the rapid switching function of described digital selector valve, and can not produce noise, and protects spool 2 well, adds the working life of spool 2.
Preferably, described digital selector valve can also use secondary voltage control.Be applied to the larger of the voltage on electromagnetic actuator device, the thrust that corresponding side electromagnetic actuator device produces spool is larger.The motion of this thrust to spool produces an acceleration, the electric current of the 24V applied during spool setting in motion, larger thrust is created to spool, spool is made to obtain a larger acceleration, when valve core movement is to the electric current of the 5V applied during extreme position, the acceleration of the spool in movement process is reduced, makes valve core movement can not produce strong collision because speed is excessive to during limit position.
Comparative example
The double electromagnet two-position four way change valve similar with the digital selector valve internal structure in embodiment 1 is adopted to carry out contrast experiment, difference is that the selector valve adopted in comparative example does not arrange buffering resilience pad in the inner walls of electromagnetic actuator device, and spool inner walls that is direct and electromagnetic actuator device after moving to extreme position collides.The rated flow of this double electromagnet two-position four way change valve and rated pressure are identical with the utility model numeral selector valve.
Under same experimental conditions, double electromagnet two-position four way change valve in comparative example and the digital selector valve in embodiment 1 are accessed respectively continuous operation 100 all after dates in same experiment oil circuit, record relevant experimental data, and calculate, obtain a result as shown in table 1:
Table 1
| ? | Comparative example | Embodiment 1 |
| Experimental condition | Identical experiment oil circuit | Identical experiment oil circuit |
| Control mode | Secondary voltage control (24v, 5v) | Secondary voltage control (24v, 5v) |
| The frequency response time | 185ms (millisecond) | 2ms (millisecond) |
| Whether noise | Metal strike produces larger noise | It is little that metal strike flexible material produces sound |
| Abrasion condition | There is tiny indenture in spool both ends of the surface | Spool both ends of the surface are without any cut |
The frequency response time refers to cumulative time needed for selector valve continuous operation 100 cycle total commutation number of times divided by selector valve in during this period of time, and what obtain often commutates once required average time.
Selector valve in comparative example is when valve core movement opposite direction operating voltage after-applied to limit position, spool stops 17ms, in order to cushion its motional inertia, and after valve core movement to limit position in this side extreme position, collide with the housing of electromagnetic actuator device, produce larger noise and vibration.
Digital selector valve in embodiment 1 is when valve core movement opposite direction operating voltage after-applied to limit position, spool is less than 0.1ms in this side extreme position waiting time, get started reversing motion afterwards, and after valve core movement to limit position, collide with the buffering resilience pad be arranged in the inner walls of electromagnetic actuator device, produce certain sound during shock, but decibel is not high, be not enough to reach noise rank, and the vibration produced when buffering resilience pad reduces collision to a certain extent.
Use the utility model numeral selector valve, the lower problem that cannot be used in quick switch operating medium direction of solenoid directional control valve frequency response can be solved, and the cost that usage ratio directional control valve or servovalve bring when switching fast working medium direction is high, noise is large, the problems such as quick abrasion, make the quick switch operating that hydraulic system is realizing working medium direction efficiently, stably to carry out.
Claims (5)
1. a digital selector valve, is characterized in that, this digital selector valve comprises valve body, spool and two electromagnetic actuator devices;
Described valve body is long column shape hollow structure, its inside is provided with the cylindric through hole running through these valve body left and right sides, and this through-hole wall is provided with an oil suction chamber, two working oil chambers and two oil back chambers, described oil suction chamber is arranged in the middle part of described valve body, oil suction chamber be each side provided with a described working oil chamber, described working oil chamber is adjacent with described oil back chamber with described oil suction chamber, and two described oil back chambers are interconnected by drainback passage; Described oil suction chamber, two described working oil chambers and two described oil back chambers are annular undercut groove and the ring surface of these five oil pockets parallels with the left and right side of described valve body, and center be all positioned at run through these valve body left and right sides central axis on; Described valve body is provided with four hydraulic fluid ports, respectively corresponding described oil suction chamber, two described working oil chambers and described oil back chamber;
Described spool is column structure, comprise the identical block section of two sizes and three Connectivity Sections, described block section and interval, Connectivity Section are arranged, and make each block section adjacent with Connectivity Section, and the length of Connectivity Section between described block section is identical with the distance between two described working oil chambers; The diameter of described block section is identical with the diameter of described valve body inner via hole, and the diameter of described Connectivity Section is less than the diameter of described block section; Described spool is arranged on the middle part in described valve body, and the central axis running through these two ends, spool left and right coincides with the central axis running through described valve body left and right sides, and described spool two ends are respectively provided with a push rod;
Described electromagnetic actuator device comprises a housing, and two electromagnet be oppositely arranged in described housing and the permanent magnet be arranged between these two electromagnet, the housing of described electromagnetic actuator device can match with the through hole on described valve body, be separately positioned on described valve body both sides, and one end of described permanent magnet is connected with described push rod, when described valve core movement is to two ends extreme position, can contact with the inwall of described housing, be provided with buffering resilience pad at this inwall place.
2. digital selector valve according to claim 1, is characterized in that, described push rod is Collapsible structure, and one end is fixedly connected with described permanent magnet, and the other end is fixedly connected with one end of described spool.
3. digital selector valve according to claim 1, is characterized in that, described digital selector valve adopts two-level current to control.
4. digital selector valve according to claim 1, is characterized in that, described digital selector valve adopts secondary voltage control.
5. according to digital selector valve according to claim 1, it is characterized in that, described buffering resilience pad is fixedly installed in the inner walls of described electromagnetic actuator device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394612.9U CN204082735U (en) | 2014-07-16 | 2014-07-16 | Numeral selector valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394612.9U CN204082735U (en) | 2014-07-16 | 2014-07-16 | Numeral selector valve |
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|---|---|
| CN204082735U true CN204082735U (en) | 2015-01-07 |
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| CN201420394612.9U Active CN204082735U (en) | 2014-07-16 | 2014-07-16 | Numeral selector valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384092A (en) * | 2015-12-24 | 2016-03-09 | 中联重科股份有限公司 | Hydraulic control method |
| CN106838376A (en) * | 2017-02-17 | 2017-06-13 | 中国人民解放军军事交通学院 | A kind of three-position electromagnetic high voltage pulse reversal valve |
| CN110185664A (en) * | 2019-05-21 | 2019-08-30 | 北京理工大学 | A kind of pilot stage digital electric hydraulic servo that area gradient is variable |
| CN114542757A (en) * | 2020-11-24 | 2022-05-27 | 盾安环境技术有限公司 | Reversing valve and refrigerating system |
-
2014
- 2014-07-16 CN CN201420394612.9U patent/CN204082735U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384092A (en) * | 2015-12-24 | 2016-03-09 | 中联重科股份有限公司 | Hydraulic control method |
| CN105384092B (en) * | 2015-12-24 | 2017-05-17 | 中联重科股份有限公司 | Hydraulic control method |
| CN106838376A (en) * | 2017-02-17 | 2017-06-13 | 中国人民解放军军事交通学院 | A kind of three-position electromagnetic high voltage pulse reversal valve |
| CN110185664A (en) * | 2019-05-21 | 2019-08-30 | 北京理工大学 | A kind of pilot stage digital electric hydraulic servo that area gradient is variable |
| CN110185664B (en) * | 2019-05-21 | 2021-02-12 | 北京理工大学 | Area gradient variable pilot-stage digital electro-hydraulic servo valve |
| CN114542757A (en) * | 2020-11-24 | 2022-05-27 | 盾安环境技术有限公司 | Reversing valve and refrigerating system |
| CN114542757B (en) * | 2020-11-24 | 2024-03-22 | 盾安环境技术有限公司 | Reversing valve and refrigerating system |
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