CN107542727B - A kind of slide valve pair hydraulic detection device and its detection method - Google Patents
A kind of slide valve pair hydraulic detection device and its detection method Download PDFInfo
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Abstract
The present invention relates to a kind of slide valve pair hydraulic detection device and its detection methods, valve seat including servo valve hydraulic platform, slide valve pair is provided on the valve seat, one end of the slide valve pair is provided with digital display device, the other end of the slide valve pair is provided with measuring device, hydraulic characteristic online simultaneously can accurately be adjusted with spool displacement and precise measurement, can really reflect slide valve pair hydraulic pressure comprehensive effect, real work performance；Data are obtained under a constant by experiment, database is established, slide valve visual simulating fluidised form can be reflected by pressure, flow truthful data, are reached and are solved various problem and shortage that are currently manufactured, repairing slide valve pair；The present invention only needs new one Geju City valve of valve to carry out detection comparison, saves the time；It when comparing figure, is calculated using formula, reduces the fault of artificial judgment curve graph, improved the utilization rate of slide valve pair, reduce cost.
Description
Technical field
The present invention relates to servo valve technology field, specifically a kind of slide valve pair hydraulic detection device and its detection method.
Background technique
In electrohydraulic servo valve maintenance process, what is often detected is flow, the pressure characteristic of servo valve entirety, is torque horse
Reach, the reflection of nozzle flapper and slide valve pair comprehensive performance, be distorted in flow, pressure characteristic, servo valve break down when
It waits, actually or slide valve pair is problematic the problem of torque-motor, nozzle flapper, it needs further fault location and excludes.
As Chinese Patent Application No. be 201410292487.5 a kind of servo valve detection device and method, propose in valve
The lower part of body is equipped with servo valve, centre installation reversal valve, and two throttle valves are installed on top, and topmost installs four pressure gauges,
By the way that the servo valve for needing to detect to be mounted on the servo valve detection device, then hydraulic power source is connected, reversal valve is to servo
Then valve fuel feeding concatenates throttle valve in servo valve outlet to detect the AB mouth pressure of servo valve, by servo valve when detection
In addition adjustable current, detects the variable quantity of output pressure, the pressure gain curve of servo valve is obtained, but in the apparatus, it is
Obtain accurate data comparison, need to detect two new valves and five Geju City valves, then by the beginning of observation pressure curve and
Stop position judges the performance of old valve, not only takes a substantial amount of time to be detected, finally manually sees that figure may go out
The case where now judging incorrectly, it is same to expend time and manpower, therefore there is still a need for improve to this.
Summary of the invention
To solve the above-mentioned problems, the present invention proposes a kind of slide valve pair hydraulic detection device and its detection method.
A kind of slide valve pair hydraulic detection device, the valve seat including servo valve hydraulic platform are provided with cunning on the valve seat
Valve pair, one end of the slide valve pair are provided with digital display device, and the other end of the slide valve pair is provided with measuring device.
The slide valve pair includes shell, the valve pocket being mounted on shell, the spool for being built in valve pocket.
The digital display device includes left side block, connects on left side block left side bar, left side bar far from shell one
The left head for holding installation, the digital display dial gauge connected in left head.
The measuring device includes right side block, connects on right side block right-hand rod, right-hand rod far from shell one
The right end socket for holding installation, the precision auger micrometer head connected on right end socket.The valve pocket is 3-position 4-way, rectangle throttle window
Mouth slide valve.It is connected on the valve seat and leads at oil for four tunnels of detection, respectively oil inlet hydraulic fluid port, oil return opening hydraulic fluid port, a left side
Work dispensing window, right work dispensing window.
The oil inlet hydraulic fluid port includes oil inlet, is connected with first pressure gauge on the oil line pipe of oil inlet；In valve
It is connected with second pressure gauge on the left work dispensing window of seat, the second electromagnetism is connected on the route that second pressure gauge is connected
Valve is connected with first gear flowmeter on the route that second solenoid valve is connected；It is connected on the oil return opening hydraulic fluid port of valve seat
Oil return opening is connected with second gear flowmeter, the first solenoid valve, return pressure table in turn on the route where oil return opening；?
It is connected with third pressure gauge on the right work dispensing window of valve seat, third electricity is connected on the route that third pressure gauge is connected
Magnet valve.
A kind of detection method of slide valve pair hydraulic detection device, the described method comprises the following steps:
Step S1: slide valve pair being mounted on valve seat, is connect with oil inlet, and the pressure of oil inlet is shown by first pressure gauge
Show, the flow for the dispensing window that works is detected by first gear flowmeter to be shown, the pressure of left work dispensing window and right work are matched
The pressure of oily window is respectively by second pressure gauge, the detection display of third pressure gauge, and the pressure of oil return opening, flow are respectively by oil return pressure
Power table and the detection display of second gear flowmeter；Spool is displaced by left side bar, right-hand rod rigid contact by precision auger micrometer
Head is accurately adjusted, and minimum step carries out precise measurement up to 0.001mm, by digital display dial gauge；
Step S2: it can require to set according to technical standard, it is believed that flow coefficient Cv, working solution density p are definite value elements, throttling
The pressure drop △ P of window is definite value, if the throttling window width of valve pocket is 0.18mm, then, f=0.18 χ, wherein f is throttling window
Area of passage, according to formula,If coefficientThen Q
The linear corresponding relationship of=K χ, flow Q and spool displacement χ, the slide valve chromaffin body stream window are 1.0mm × 0.18mm rectangle
Window；When the mobile spool of adjustment precision spiral micrometer head, when first gear flowmeter being made to show flow zero, by digital display dial gauge
It resets, i.e. slide valve pair zero-bit χ=0, spool, which is moved to the left, is defined as negative direction, and spool, which moves right, is defined as positive direction, then valve
The range that core is displaced χ is -1.0≤χ≤1.0；
Step S3: when spool is moved right by slide valve pair zero-bit, the every mobile 0.1mm of spool, slide valve pair corresponds to throttling window
A flow will be exported to be corresponding to it, obtain the secondary positive flow curve graph of slide valve；Similarly, spool is from slide valve pair zero-bit to moving to left
It is dynamic, it can equally obtain curve graph；Finally obtain slide valve pair flow curve figure；
Step S4: the mobile spool of adjustment precision spiral micrometer head, when first gear flowmeter shows that flow is zero, the position
Setting is slide valve pair origin, and digital display dial gauge is reset, i.e. slide valve pair zero-bit χ=0；When changing the pressure of oil inlet, connect
First solenoid valve, the flow of slide valve pair dispensing window overflow is detected by second gear flowmeter to be shown, the every increasing of the pressure of oil inlet
As soon as adding a step-length (such as 2MPa), second gear flowmeter can detect that the flow of an overflow is corresponding to it, and above-mentioned steps are opened
Exhibition new product slide valve and cross and overhaul phase slide valve hydraulic performance comparison research, experiment can using bit traffic empirical curve in new product slide valve as
Lower limit, the slide valve empirical curve that fit clearance is relaxed show that slide valve pair can install the envelope used as the upper limit, and confirms cunning
The failure of valve pair, or exclude the possibility of slide valve pair failure.
When corresponding pressure characteristic, need to close second solenoid valve, third solenoid valve.
When the charge oil pressure for forming slide valve by spool and valve pocket is constant, spool is equipped with displacement χ with respect to neutral position, just there is stream
The relationship for transporting to the flow Q, flow Q and spool displacement χ of load cavity through throttling window is known as slide valve discharge characteristic.
The beneficial effects of the present invention are: hydraulic characteristic online simultaneously can accurately be adjusted with spool displacement and precise measurement,
It can really reflect slide valve pair hydraulic pressure comprehensive effect, real work performance；Micron order displacement is obtained under a constant by testing
Corresponding pressure, data on flows and the slide valve pair zero leakage amount data under gradient pressure, establish database, can be visual by slide valve
Change emulation fluidised form to reflect by pressure, flow truthful data, reaches and solve various asking that be currently manufactured, repairing slide valve pair
Topic and deficiency；The present invention only needs new one Geju City valve of valve to carry out detection comparison, saves the time；When comparing figure, use
Formula is calculated, and the fault of artificial judgment curve graph is reduced, and is improved the utilization rate of slide valve pair, is reduced cost.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is schematic view of the front view of the invention；
Fig. 2 is the slide valve auxiliary structure schematic diagram of the invention on valve seat；
Fig. 3 is the secondary positive flow curve graph of slide valve of the invention；
Fig. 4 is slide valve pair flow curve figure of the invention；
Fig. 5 is slide valve throttling window visual simulating fluidised form velocity profile figure of the invention；
Fig. 6 is slide valve throttling window visual simulating fluidised form pressure motion pattern of the invention；
Fig. 7 is new product valve and old product valve hydraulic performance comparative study figure of the invention；
Fig. 8 is servo valve hydraulic platform schematic diagram of the invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below it is right
The present invention is further described.
As depicted in figs. 1 and 2, a kind of slide valve pair hydraulic detection device, the valve seat 13 including servo valve hydraulic platform, institute
It is provided with slide valve pair on the valve seat 13 stated, one end of the slide valve pair is provided with digital display device, secondary another of the slide valve
End is provided with measuring device.The slide valve pair includes shell 1, the valve pocket being mounted on shell 12, the valve for being built in valve pocket 2
Core 3.The digital display device includes left side block 8, connects on left side block 8 left side bar 7, left side bar 7 far from shell 1 one
The left head 5 for holding installation, the digital display dial gauge 4 connected in left head 5.The measuring device includes right side block 9, on right side
The right-hand rod 10 that connects on block 9, the right end socket 11 installed far from one end of shell 1 in right-hand rod 10 connect on right end socket 11
Precision auger micrometer head 12, be provided with adjusting screw 25 on the precision auger micrometer head 12.
As shown in figure 8, the valve pocket 2 is 3-position 4-way, rectangle throttling window slide valve.
Be connected on the valve seat 13 for detection four tunnels lead to oil at, respectively oil inlet hydraulic fluid port, oil return opening hydraulic fluid port,
Left work dispensing window, right work dispensing window.The oil inlet hydraulic fluid port includes oil inlet 14, in the oil-way pipe of oil inlet 14
First pressure gauge 15 is connected on road；It is connected with second pressure gauge 16 on the left work dispensing window of valve seat 13, in the second pressure
It is connected with second solenoid valve 17 on the route that power table 16 is connected, is connected with first on the route that second solenoid valve 17 is connected
Gear meter 18；It is connected with oil return opening 19 on the oil return opening hydraulic fluid port of valve seat 13, on the route where oil return opening 19 successively
It is connected with second gear flowmeter 20, the first solenoid valve 21, return pressure table 22；On the right work dispensing window of valve seat 13
It is connected with third pressure gauge 24, third solenoid valve 23 is connected on the route that third pressure gauge 24 is connected.
The left side block 8 and right side block 9 keeps cooperation close by vulcanized rubber and shell 1, left side bar 7, right-hand rod 10
Envelope is attached to part screw-driving with servo valve and is fixed on 1 left and right sides of shell.
Described 7 tips of left side bar are put by left side block 8 and 3 left end rigid contact of spool, 7 boss of left side bar left side
It is threadedly coupled with left head 5 with left side block 8 after spring 6, is withstood on 7 left side of bar of left side, be used for digital display dial gauge 4 is top
The measurement of 3 moving displacement of spool, 4 measurement accuracy 0.001mm of digital display dial gauge.
It is described at 10 tips of right-hand rod to be put into spring 6 and when by right side block 9 and 3 right end rigid contact of spool, it uses
The internal fissure of right 11 left end of end socket connect with the external screw thread of right side block 9 and precision auger micrometer head 12 is threaded into right end socket 11
Internal screw thread to stop after, with precision auger micrometer head 12 carry back of the body cap tighten, 12 measuring rod of precision auger micrometer head is withstood on
On 10 right side of right-hand rod, 12 knob of adjustment precision spiral micrometer head, adjustable spool 3 moves left and right and can Real time displaying movement
Amount, 12 measurement accuracy 0.001mm of precision auger micrometer head can show that numerical value comparison monitors, and identifies spool 3 with digital display dial gauge 4
Whether idle stroke is occurred；Meanwhile left head 5, right end socket 11 screw be mounted on left side block 8, on right side block 10 when, spring 6 can be made
There is certain pre-pressing force, guarantees the sharp left and right end rigid contact with spool 3 of point of left side bar 7, right-hand rod 10, designed from structure
On avoid the generation of 3 idle stroke of spool.
A kind of detection method of slide valve pair hydraulic detection device, the described method comprises the following steps:
Step S1: slide valve pair is mounted on valve seat 13, is connect with oil inlet 14, and the pressure of oil inlet 14 is by first pressure
Table 15 shows that the flow of the dispensing window that works is detected by first gear flowmeter 18 and shown, the pressure of left work dispensing window and
The pressure of right work dispensing window is detected by second pressure gauge 16, third pressure gauge 24 show respectively, the pressure of oil return opening 19,
Flow is respectively by return pressure table 22 and the detection display of second gear flowmeter 20；Spool 3 is rigid by left side bar 7, right-hand rod 10
Property contact, displacement accurately adjusted by precision auger micrometer head 12, minimum step is up to 0.001mm, by digital display dial gauge 4
Carry out precise measurement.
Step S2: it can require to set according to technical standard, it is believed that flow coefficient Cv, working solution density p are definite value elements, throttling
The pressure drop △ P of window is definite value, if the throttling window width of valve pocket 2 is 0.18mm, then, f=0.18 χ, wherein f is throttle window
It makes a slip of the tongue flow area, according to formula,If coefficientThen
The linear corresponding relationship of Q=K χ, flow Q and spool displacement χ, the slide valve chromaffin body stream window are 1.0mm × 0.18mm square
Shape window；When the mobile spool 3 of adjustment precision spiral micrometer head 12 will count when first gear flowmeter 18 being made to show flow zero
Aobvious amesdial 4 is reset, i.e. slide valve pair zero-bit χ=0, and spool 3, which is moved to the left, is defined as negative direction, and spool 3, which moves right, to be defined as
Positive direction, then it is -1.0≤χ≤1.0 that spool 3, which is displaced the range of χ,.
Step S3: when spool 3 is moved right by slide valve pair zero-bit, the every mobile 0.1mm of spool 3, slide valve pair corresponds to throttle window
Mouth will export a flow and be corresponding to it and (see the table below), obtain the secondary positive flow curve graph of slide valve (see Fig. 3)；Similarly, spool 3
It is moved to the left by slide valve pair zero-bit, can equally obtain curve graph；Finally obtain slide valve pair flow curve figure (see Fig. 4).
Step S4: the mobile spool 3 of adjustment precision spiral micrometer head 12, when first gear flowmeter 18 shows that flow is zero
When, which is slide valve pair origin, digital display dial gauge 4 is reset, i.e. slide valve pair zero-bit χ=0；When the pressure for changing oil inlet 14
When power, the first solenoid valve 21 is connected, the flow of slide valve pair dispensing window overflow is detected by second gear flowmeter 20 to be shown, oil inlet
As soon as the every increase step-length (such as 2MPa) of pressure of mouth 14, second gear flowmeter 20 can detect the flow of an overflow therewith
Corresponding, above-mentioned steps, which are carried out new product slide valve and crossed, overhauls phase slide valve hydraulic performance comparison research, and experiment can be by position in new product slide valve
For flux experiment curve as lower limit, slide valve empirical curve that fit clearance is relaxed show that slide valve pair can install use as the upper limit
Envelope, and confirm the failure of slide valve pair, or exclude the possibility of slide valve pair failure.
When the charge oil pressure for forming slide valve by spool 3 and valve pocket 2 is constant, spool 3 is equipped with displacement χ with respect to neutral position, just
There is the relationship for flowing through throttling window and transporting to the flow Q, flow Q and spool displacement χ of load cavity to be known as slide valve discharge characteristic.
Slide valve pair: 1, being installed on the valve seat 13 of servo valve hydraulic platform by application method of the invention, with oil inlet 14
Connection has first pressure gauge 15 as measurement, constant supply；
It 2,, will when gear meter 18 being made to show flow zero when the mobile spool 3 of 12 knob of adjustment precision spiral micrometer head
Digital display dial gauge 4 shows zeros data, i.e. slide valve pair zero-bit χ=0；Spool 3, which is moved to the left, is defined as negative direction, and spool 3 is to the right
Movement is defined as positive direction, then it is -1.0≤χ≤1.0 that spool 3, which is displaced the range of χ,；
3, when 12 knob of adjustment precision spiral micrometer head makes spool 3 be moved right by slide valve pair zero-bit, the every movement of spool 3
0.1mm, the corresponding throttling window of slide valve pair will export a flow and be corresponding to it, and obtain the secondary positive flow curve graph of slide valve；Together
Reason, spool 3 are moved to the left by slide valve pair zero-bit, can equally obtain curve graph；Finally obtain slide valve pair flow curve figure；
4, by servo valve hydraulic platform second solenoid valve 17 and third solenoid valve 23 be switched to oil circuit and close, corresponding pressure
Force characteristic；
5, the mobile spool 3 of 12 knob of adjustment precision spiral micrometer head, when first gear flowmeter 18 being made to show flow zero,
The position is slide valve pair origin, and digital display dial gauge 4 is shown zeros data, i.e. slide valve pair zero-bit χ=0；When the constant confession of change
When the oil pressure given, (being shown by first pressure gauge 15) connects the first solenoid valve 21 and is switched to flowmeter channel, and slide valve pair is with oil
The flow of window overflow is detected by second gear flowmeter 20 and is shown, for oil feed pressure one step-length (such as 2MPa) of every increase, second
Gear meter 20 can detect that the flow of an overflow is corresponding to it, and establish database, show that slide valve throttling window is visual
Change emulation fluidised form velocity profile figure (see Fig. 5) and slide valve throttling window visual simulating fluidised form pressure motion pattern (see Fig. 6), finally
New product valve and old product valve hydraulic performance comparative study figure (see Fig. 7) are obtained, is solved the problems, such as currently manufactured, repairing slide valve pair various
And deficiency.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent
Object defines.
Claims (7)
1. a kind of slide valve pair hydraulic detection device, the valve seat (13) including servo valve hydraulic platform, it is characterised in that: the valve
It is provided with slide valve pair on seat (13), one end of the slide valve pair is provided with digital display device, and the other end of the slide valve pair is set
It is equipped with measuring device；It is connected on the valve seat (13) and leads at oil for four tunnels of detection, respectively oil inlet hydraulic fluid port, oil return
Mouth hydraulic fluid port, left work dispensing window, right work dispensing window；The oil inlet hydraulic fluid port includes oil inlet (14), in oil inlet
(14) first pressure gauge (15) are connected on oil line pipe；The second pressure is connected on the left work dispensing window of valve seat (13)
Power table (16) is connected with second solenoid valve (17) on the route that second pressure gauge (16) is connected, in second solenoid valve (17)
First gear flowmeter (18) are connected on the route connected；Oil return opening is connected on the oil return opening hydraulic fluid port of valve seat (13)
(19), second gear flowmeter (20), the first solenoid valve (21), oil return are connected in turn on the route where oil return opening (19)
Pressure gauge (22)；Third pressure gauge (24) are connected on the right work dispensing window of valve seat (13), in third pressure gauge (24)
Third solenoid valve (23) are connected on the route connected.
2. a kind of slide valve pair hydraulic detection device according to claim 1, it is characterised in that: the slide valve pair includes shell
Body (1), the valve pocket (2) being mounted on shell (1), the spool (3) for being built in valve pocket (2).
3. a kind of slide valve pair hydraulic detection device according to claim 1, it is characterised in that: the digital display device includes
Left side block (8), the left side bar (7) connected on left side block (8), the left envelope installed in left side bar (7) far from the one end of shell (1)
Head (5), the digital display dial gauge (4) connected on left head (5).
4. a kind of slide valve pair hydraulic detection device according to claim 1, it is characterised in that: the measuring device includes
Right side block (9), the right-hand rod (10) connected on right side block (9), the right side installed in right-hand rod (10) far from the one end of shell (1)
End socket (11), the precision auger micrometer head (12) connected on right end socket (11).
5. a kind of slide valve pair hydraulic detection device according to claim 2, it is characterised in that: the valve pocket (2) is three
Position four-way, rectangle throttling window slide valve.
6. a kind of detection method of slide valve pair hydraulic detection device according to any one of claim 1 to 5, feature exist
In: it the described method comprises the following steps:
Step S1: slide valve pair is mounted on valve seat (13), is connect with oil inlet (14), and the pressure of oil inlet (14) is by first
Pressure gauge (15) display, the flow for the dispensing window that works is detected by first gear flowmeter (18) to be shown, left work dispensing window
Pressure and right work dispensing window pressure respectively by second pressure gauge (16), third pressure gauge (24) detection display, oil return
The pressure of mouth (19), flow are shown by return pressure table (22) and second gear flowmeter (20) detection respectively；Spool (3) passes through
Left side bar (7), right-hand rod (10) rigid contact, displacement are accurately adjusted by precision auger micrometer head (12), and minimum step can
Up to 0.001mm, precise measurement is carried out by digital display dial gauge (4)；
Step S2: it can require to set according to technical standard, it is believed that flow coefficient Cv, working solution density p are definite value element, throttle window
The pressure drop △ P of mouth is definite value, if the throttling window width of valve pocket (2) is 0.18mm, then, f=0.18 χ, wherein f is throttle window
It makes a slip of the tongue flow area, according to formula,If coefficientThen Q
The linear corresponding relationship of=K χ, flow Q and spool displacement χ, the slide valve chromaffin body stream window are 1.0mm × 0.18mm rectangle
Window；When adjustment precision spiral micrometer head (12) are mobile spool (3), and first gear flowmeter (18) is made to show flow zero,
Digital display dial gauge (4) are reset, i.e. slide valve pair zero-bit χ=0, spool (3), which is moved to the left, is defined as negative direction, and spool (3) is to the right
Movement is defined as positive direction, then the range of spool (3) displacement χ is -1.0≤χ≤1.0；
Step S3: when spool (3) is moved right by slide valve pair zero-bit, the every mobile 0.1mm of spool (3), slide valve pair corresponds to throttle window
Mouth will export a flow and be corresponding to it, and the secondary positive flow curve graph of slide valve can be obtained；Similarly, spool (3) is by slide valve pair zero
Position is moved to the left, and can equally obtain curve graph；Finally obtain slide valve pair flow curve figure；
Step S4: adjustment precision spiral micrometer head (12) is mobile spool (3), when first gear flowmeter (18) show that flow is zero
When, which is slide valve pair origin, digital display dial gauge (4) is reset, i.e. slide valve pair zero-bit χ=0；When change oil inlet (14)
Pressure when, connect the first solenoid valve (21), the flow of slide valve pair dispensing window overflow is detected by second gear flowmeter (20)
It has been shown that, oil inlet (14) as soon as the every increase step-length of pressure, second gear flowmeter (20) can detect the stream of an overflow
Amount is corresponding to it, and above-mentioned steps carry out new product valve and old product valve hydraulic performance comparative study figure, and experiment can be by position in new product slide valve
For flux experiment curve as lower limit, slide valve empirical curve that fit clearance is relaxed show that slide valve pair can install use as the upper limit
Envelope, and confirm the failure of slide valve pair, or exclude the possibility of slide valve pair failure.
7. a kind of detection method of slide valve pair hydraulic detection device according to claim 6, it is characterised in that: when by spool
(3) when and the charge oil pressure of valve pocket (2) composition slide valve is constant, spool (3) is equipped with displacement χ with respect to neutral position, just flows through throttling
Window and the relationship of the flow Q for transporting to load cavity, flow Q and spool displacement χ are known as slide valve discharge characteristic.
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| JPH0379805A (en) * | 1989-08-22 | 1991-04-04 | Mitsubishi Heavy Ind Ltd | Edge wear detection in direct operated servo valve |
| KR100846314B1 (en) * | 2008-04-01 | 2008-07-15 | 주식회사 에네스코 | Test Block for Non-Control Hydraulic Actuator |
| CN103398045A (en) * | 2013-08-14 | 2013-11-20 | 上海衡拓液压控制技术有限公司 | Pneumatic flow measuring device of electro-hydraulic servo valve with sliding valve-controlled throttling window coverage |
| CN104314921A (en) * | 2014-07-09 | 2015-01-28 | 镇江四联机电科技有限公司 | Multifunctional hydraulic servovalve testing device |
| CN205298146U (en) * | 2015-12-25 | 2016-06-08 | 上海佳惠液压机械设备有限公司 | Hydrovalve pressure pulse test bench |
| CN206072016U (en) * | 2016-08-30 | 2017-04-05 | 石家庄海山航空电子科技有限公司 | A kind of pressure maintaining valve test equipment oil way switching mechanism |
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| CN107542727A (en) | 2018-01-05 |
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