CN209542029U - A kind of PE ball valve Micro blazed-grating testing agency - Google Patents
A kind of PE ball valve Micro blazed-grating testing agency Download PDFInfo
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- CN209542029U CN209542029U CN201822235072.0U CN201822235072U CN209542029U CN 209542029 U CN209542029 U CN 209542029U CN 201822235072 U CN201822235072 U CN 201822235072U CN 209542029 U CN209542029 U CN 209542029U
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- ball valve
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- sealing
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Abstract
The utility model discloses a kind of PE ball valve Micro blazed-grating testing agencies, it includes the built-in fixing seat in ball valve inner cavity to be measured, closed reference cavity is installed in fixing seat, reference cavity is equipped with instrument connection and venthole, the seal assembly and driving seal assembly that venthole is also equipped in fixing seat slide the power mechanism so that seal assembly blocking venthole or disengagement venthole, differential pressure pick-up is also equipped in fixing seat, one detection interface of differential pressure pick-up and the instrument connection of reference cavity connect, another detection interface of differential pressure pick-up is exposed in the sealed internal chamber of ball valve to be measured.The testing agency of the utility model simplifies entire mechanism, reduces the volume of entire mechanism, is adapted to the ball valve detection demand of different size.
Description
Technical field
The utility model belongs to ball valve air-leakage test technical field, especially a kind of PE ball valve Micro blazed-grating testing agency.
Background technique
Currently, when industrial polyethylene (PE) ball valve be applied to flammable and explosive fluid transfer conduit when, PE ball valve it is close
Sealing property need to meet stringent technical requirements standard.Due to the special molding of PE ball valve element and assembly technology, internal knot
Component density is uneven, structural member between each other with the presence of minim gap the phenomenon that have certain generality.It is high in transfer conduit
Pressure gas medium then may slowly be overflowed from these gaps, so as to cause ball valve Micro blazed-grating phenomenon occur.
In PE valve gate technology standard, sealing performance mainly passes through high pressure and the method for testing low pressure increase is examined
It tests, such as Chinese patent Authorization Notice No. are as follows: PE ball valve air tightness test machine disclosed in CN 204694409U a comprising machine
Frame, rack upside are equipped with the fixed mechanism of ball valve, the sealing mechanism of ball valve are equipped on the inside of rack；Fixed mechanism includes a positioning block
The clamp system being oppositely arranged with two, each clamp system include a fixture block, a screw rod and a handwheel, are equipped among locating piece
The V-type opening of a positioning hole, the V-shaped opening in fixture block front side, two fixture blocks is relatively set to positioning hole, can be moved forward and backward, often
It is connect by screw rod with handwheel on rear side of a fixture block, is threadedly engaged between screw rod and locating piece, rotation is equipped between fixture block and screw rod
Relocation mechanism；Sealing mechanism includes a cylinder and a sealing cover, and filling block is equipped on the upside of gasket, offers test on filling block
Stomata.
What a above-mentioned PE ball valve air tightness test machine when in use, first adjusts according to the ball valve of required test model and clamps
The position of mechanism fixture block, then the positioning hole of locating piece is inserted in by ball valve one end is tested, the handwheel of another clamp system is rotated,
The position that this handwheel corresponds to fixture block is adjusted, ball valve is clamped, starts cylinder, so that sealing cover and gasket are mobile, withstands ball sealer
Valve one end, for reducing test cavity, can both pass through the test on sealing cover and gasket at this point, filling block stretches in ball valve
Stomata carries out air tightness test.Although the test machine of above structure has certain adaptability, it is directed to the biggish PE ball of volume
For valve, larger difficulty there is in fixing ball valve, furthermore above-mentioned test machine predominantly detects absolute pressure difference variation, volume is larger
PE ball valve, occur minor leakage when, be easy ignored.It therefore, is the accuracy and speed for improving Micro blazed-grating detection, in detection ball
Inside valve while absolute pressure, it is also vital that the structure of detection air pressure minor change, which is added,.
Summary of the invention
In order to overcome the deficiencies of the prior art, the utility model provides a kind of PE ball valve Micro blazed-grating testing agency, the inspection
It is small to survey organization volume, is detected by placing it in the mode inside ball valve to be detected, is adapted to various models
The detection of PE ball valve, adaptable wide advantage, moreover, the testing agency can detecte out valve using differential pressure method detection mode
Internal slight pressure variation solves accumulation for a long time required for single absolute pressure measures and judges the brought time at merits and demerits
High problem.
To achieve the goals above, the technical solution adopted in the utility model is: a kind of PE ball valve Micro blazed-grating testing agency,
It is characterized by comprising the built-in fixing seat in ball valve inner cavity to be measured, closed reference cavity is installed in fixing seat, is referred to
Chamber is equipped with instrument connection and venthole, the seal assembly and driving seal assembly that venthole is also equipped in fixing seat slide so that
Seal assembly blocks venthole or disengages the power mechanism of venthole, and differential pressure pick-up, differential pressure sensing are also equipped in fixing seat
One detection interface of device and the instrument connection of reference cavity connect, another detection interface of differential pressure pick-up is exposed to ball valve to be measured
In sealed internal chamber.
In above structure, the venthole of reference cavity and ball valve inner cavity to be measured connection, when ball valve inner cavity is passed through higher than atmospheric pressure
After the gas of power, gassy in reference cavity then drives seal assembly to block upper vent hole, joins at this time by power mechanism
The equivalent current ambient pressure to be measured of intracavitary air pressure is examined, and a detection mouth of differential pressure pick-up detects air pressure in reference cavity, Ling Yijian
It surveys mouth and detects the air pressure change in ball valve inner cavity to be measured, the air pressure difference in two chambers is monitored by differential pressure pick-up and is changed,
Judge whether ball valve to be measured leaks air situation, and the structural volume is small, at low cost, easy to detect and monitoring is accurate.
Further, the power mechanism includes motor, and motor output end is connected with screw rod, the fixed peace of the seal assembly
Loaded on nut one end, the nut other end is threadedly coupled with screw rod formation, and seal assembly and instrument connection cooperate.
In above structure, power mechanism is mobile towards instrument connection direction by screw drive seal assembly or retreats logical to realize
The sealing of stomata blocks or disengages ventilation.
Further, the position-limiting cover that limitation nut circumferentially rotates is also equipped in the fixing seat.
In above structure, nut is carried out by position-limiting cover in fixing seat to circumferentially rotate limitation, so that nut and sealing group
Part is done under the driving of motor and screw rod axially to be slid back and forth, so that the contraposition of seal assembly and venthole is more acurrate, position-limiting cover
It can be limited by way of elongated slot and limited block, the snap fit etc. of fixture block and groove cooperation can also be passed through.
Further, the nut includes being revealed in appearing end, being placed in position-limiting cover inner hole except position-limiting cover
End is accommodated, the accommodating end and position-limiting cover inner hole form circumferential limit and axial sliding cooperates, and the seal assembly is installed on spiral shell
Female appears end.
In above structure, nut is connect by appearing end with seal assembly, and nut passes through accommodating end and position-limiting cover inner hole shape
The circumferentially axial sliding cooperation of limit, specifically, the outer wall at the accommodating end of nut can form planar structure through cutting, by flat
Face structure is bonded only along axial sliding with position-limiting cover inner wall, can not be circumferentially rotated.
Further, the seal assembly includes seal receptacle and sealing-plug, and seal receptacle is installed on nut one end, the nut end
With the groove being adapted to seal receptacle, seal receptacle is embedded in groove.
In above structure, in the groove of seal receptacle inserted num one end, sealing-plug and venthole cooperate.
Further, the groove floor is equipped with central protuberance seat, and central protuberance seat passes through in seal receptacle embedding sealing plug.
In above structure, in the groove of seal receptacle inserted num after, in groove also by central protuberance seat and sealing stopper
At cooperation is embedded, enhance the installation fastness of seal assembly.
Further, the seal receptacle is ring structure, sealing-plug include bottom base and by bottom base along axial
The frustum structure of extension, in the interior annular distance of bottom base embedding sealing seat, frustum structure and venthole cooperate, venthole inner wall shape
At the small conical through-hole of outer imperial palace, which is adapted to frustum structure, and conical through-hole is through inside shrink tunnel and reference cavity
Connection.
In above structure, sealing-plug is cooperated by the wide cylindrical bottom pedestal of diameter and seal receptacle, frustum structure and logical
The conical through-hole of stomata formed it is in sealing contact, then by shrink tunnel and reference cavity connection on the inside of venthole, so that conical through-hole
Interior air-flow has reflux trend, is plugged with suction-operated to sealing, enhances sealing effect.
Further, the seal receptacle is ring structure, sealing-plug include bottom base and by bottom base along axial
The frustum structure of extension, in the interior annular distance of bottom base embedding sealing seat, frustum structure and venthole cooperate, venthole inner wall shape
At the small conical through-hole of outer imperial palace, which is adapted to frustum structure, and conical through-hole is through inside shrink tunnel and reference cavity
Connection, the central protuberance seat include the cylinder perpendicular to groove floor, and cylindrical tip is equipped with frustum seat, frustum seat basal diameter
Greater than body diameter, the bottom base has the through-hole being adapted to cylinder, and frustum structure has the groove being adapted to frustum seat.
In above structure, in the groove of seal receptacle inserted num, central protuberance seat is cooperated by cylinder and bottom base,
It is embedded cooperation by frustum seat and frustum structure formation, so that the mounting structure firm stable of seal assembly.
Further, the position-limiting cover bottom is installed in fixing seat, and one end that the motor is connected with screw rod is placed in
In position-limiting cover inner hole, the motor other end is held on motor cabinet, and motor cabinet is installed in fixing seat.
In above structure, motor cabinet is of an L-shaped structure, and motor local device is on the L-type step surface, the motor cabinet and fixation
Seat is integrally formed.
Using the above scheme, the utility model changes the conventional method leaked hunting in real time by slight pressure, and assessment valve produces
On the one hand the situation of product Micro blazed-grating solves single absolute pressure measurement and needs time cost mistake brought by accumulation judgement for a long time
High problem, on the other hand, the utility model have the characteristics that low-cost and easy-to realization, can be largely used to enterprises production locale, favorably
Control of product quality system is improved in enterprise；In addition, the utility model realizes differential pressure measuring with lesser volume and power mechanism
Whole detection mechanism can be placed among any ball valve by testing conditions needed for method, adaptable, for ball valve to be measured
Size do not require.
The utility model is further described with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing 1 is the utility model specific embodiment structural schematic diagram；
Attached drawing 2 is the utility model specific embodiment structure top view；
Attached drawing 3 is the utility model specific embodiment structure A-A cross-sectional view；
Attached drawing 4 is the utility model specific embodiment structural side view；
Attached drawing 5 is the utility model specific embodiment structure B-B cross-sectional view；
Attached drawing 6 is that the utility model specific embodiment removes the structural schematic diagram after position-limiting cover；
Fixing seat 1, reference cavity 2, instrument connection 22, venthole 21, conical through-hole 211, shrink tunnel 212, differential pressure pick-up
3, motor 4, motor cabinet 41, screw rod 42, seal assembly 5, seal receptacle 51, sealing-plug 52, bottom base 521, frustum structure 522,
Position-limiting cover 6, nut 7 appear end 71, groove 711, central protuberance seat 712, cylinder 712a, frustum seat 712b, accommodating end 72, put down
Face structure 721.
Specific embodiment
Specific embodiment of the utility model is PE ball valve Micro blazed-grating testing agency as shown in figures 1 to 6 comprising built-in
Fixing seat 1 in ball valve inner cavity to be measured, closed reference cavity 2 is equipped in fixing seat 1, and reference cavity 2 is equipped with 22 He of instrument connection
Venthole 21, the seal assembly 5 and driving seal assembly 5 that venthole 21 is also equipped in fixing seat 1 slide so that sealing group
Part 5 blocks venthole 21 or disengages the power mechanism of venthole 21, and differential pressure pick-up 3, differential pressure sensing are also equipped in fixing seat 1
One detection interface of device 3 is connect with the instrument connection 22 of reference cavity 2, another detection interface of differential pressure pick-up 3 is exposed to be measured
In the sealed internal chamber of ball valve, the venthole 21 and ball valve inner cavity to be measured connection of reference cavity 2, when ball valve inner cavity is passed through higher than atmospheric pressure
After the gas of power, gassy in reference cavity 2 then drives seal assembly 5 to block upper vent hole 21 by power mechanism, this
When reference cavity 2 in the equivalent current ambient pressure to be measured of air pressure, and air pressure in a detection mouth of differential pressure pick-up 3 detection reference cavity 2,
Another detection mouth detects the air pressure change in ball valve inner cavity to be measured, monitors the draught head in two chambers by differential pressure pick-up 3
Value variation, to judge whether ball valve to be measured leaks air situation.
Power mechanism includes motor 4, and 4 output end of motor is connected with screw rod 42, and seal assembly 5 is fixedly installed in nut 7 one
End, 7 other end of nut are threadedly coupled with the formation of screw rod 42, and seal assembly 5 and instrument connection 22 cooperate, and power mechanism passes through screw rod 42
Driving seal assembly 5 blocks or disengages ventilation towards the sealing that 22 direction of instrument connection is mobile or retreats to realize venthole 21.
Further, nut 7 is carried out to circumferentially rotate limitation by position-limiting cover 6 in fixing seat 1, so that nut 7 and sealing
Component 5 is done under the driving of motor 4 and screw rod 42 axially to be slid back and forth, so that seal assembly 5 and the contraposition of venthole 21 are more quasi-
Really, position-limiting cover 6 can be limited by way of elongated slot and limited block, the clamping side that can also be cooperated by fixture block and groove 711
Formula etc..6 bottom of position-limiting cover is installed in fixing seat 1 by accessories such as fastening screw, fastening bolts, and motor 4 is connected with screw rod
42 one end is placed in 6 inner hole of position-limiting cover, and 4 other end of motor is held on motor cabinet 41, and motor cabinet 41 is installed in fixing seat 1
On, motor cabinet 41 is of an L-shaped structure, 4 local device of motor on the L-type step surface, the motor cabinet 41 and 1 one of fixing seat at
Type.
Above-mentioned nut 7 is connect by appearing end 71 with seal assembly 5, and nut 7 passes through accommodating end 72 and 6 inner hole shape of position-limiting cover
The circumferentially axial sliding cooperation of limit, specifically, the outer wall at the accommodating end 72 of nut 7 can form planar structure 721 through cutting,
It is bonded only with 6 inner wall of position-limiting cover along axial sliding, can not be circumferentially rotated by planar structure 721.Seal assembly 5 includes sealing
Seat 51 and sealing-plug 52, seal receptacle 51 are installed on 7 one end of nut, and the end of nut 7 has the groove 711 being adapted to seal receptacle 51,
Seal receptacle 51 is embedded in groove 711, and sealing-plug 52 and venthole 21 cooperate, and 711 bottom surface of groove is equipped with central protuberance seat 712,
Central protuberance seat 712 passes through in 51 embedding sealing plug 52 of seal receptacle.
In order to enhance the installation fastness of seal assembly 5, in the groove 711 of 51 inserted num 7 of seal receptacle after, groove 711
In also by central protuberance seat 712 and sealing-plug 52 formation be embedded cooperation.Seal receptacle 51 is ring structure, and sealing-plug 52 includes bottom
Portion's pedestal 521 and the frustum structure 522 axially extended by bottom base 521,521 embedding sealing seat 51 of bottom base
In interior annular distance, frustum structure 522 and venthole 21 cooperate, and 21 inner wall of venthole forms the small conical through-hole 211 of outer imperial palace, the cone
Shape through-hole 211 is adapted to frustum structure 522, and conical through-hole 211 is through shrink tunnel 212 and 2 inside connection of reference cavity, central protuberance
Seat 712 includes the cylinder 712a perpendicular to 711 bottom surface of groove, and the top cylinder 712a is equipped with frustum seat 712b, the bottom frustum seat 712b
Face diameter is greater than cylinder 712a diameter, and bottom base 521 has the through-hole that be adapted to cylinder 712a, frustum structure 522 with
The groove 711 of frustum seat 712b adaptation, in the groove 711 of 51 inserted num 7 of seal receptacle, central protuberance seat 712 passes through cylinder
712a and bottom base 521 cooperate, and are embedded cooperation by frustum seat 712b and the formation of frustum structure 522, so that seal assembly 5
Mounting structure firm stable；Sealing-plug 52 is cooperated by the wide cylindrical bottom pedestal 521 of diameter and seal receptacle 51, frustum structure
522 form in sealing contact with the conical through-hole 211 of venthole 21, and 21 inside of venthole then passes through shrink tunnel 212 and reference cavity 2
Connection has suction-operated to sealing-plug 52, enhances sealing effect so that 211 interior air-flow of conical through-hole has reflux trend.
Working principle of the utility model is: the gas higher than atmospheric pressure is filled with into entire ball valve inner cavity to be measured environment first
Body, pressure depend on the standard of monitoring, and there are two the interface of monitoring air pressure, two interface monitors of aeration phase for differential pressure pick-up 3
Cavity communicate；When inner gas pressure reaches examination criteria, by the venthole 21 of the blocking reference cavity 2 of seal assembly 5, so that
Reference cavity 2 keeps sealing state, keeps air pressure therein, while differential pressure pick-up 3 monitors both ends air pressure (ball valve inner cavity to be measured
And reference cavity 2) difference may determine that the cavity gas leakage of ball valve to be measured if both ends air pressure has bigger difference.
The PE ball valve Micro blazed-grating testing agency of the utility model is provided with an airtight cavity as reference cavity 2, and differential pressure passes
One detection interface of sensor 3 connects on this reference cavity 2, another interface opening (i.e. ball valve inner cavity ambient pressure)；When filling
After gas air pressure reaches examination criteria stabilization, testing agency is axially moved by a small motor 4 with dynamic sealing assembly 5
(a small piston mechanism is made of motor 4, screw rod 42, piston and position-limiting cover 6), is turned on or off when needed
Reference cavity 2, when piston opens (seal assembly 5 is detached from the cooperation with venthole 21), reference cavity 2 is connected to current environment, piston
When closing, reference cavity 2 then keeps wherein air pressure constant as individual cavity.The above-mentioned piston for being used to open and close reference cavity 2
Mechanism is to realize the important mechanism of closed reference cavity 2, and wherein motor 4 mainly provides power, and screw rod 42 connects motor 4 and sealing-plug
52, switching kinetics direction, position-limiting cover 6 limits the position of sealing-plug 52, and the direction for keeping it to move makes it accurately seal ventilation
One of accent of hole 21(reference cavity 2), sealing-plug 52 has flexible sealing plug (frustum structure 522), and size is just pasted
Accent is closed, when power of the sealing-plug 52 by 21 direction of venthole, plug (frustum structure 522) is deformed, and then is sealed
Venthole 21.The structural volume of the utility model is small, at low cost, and easy to detect and monitoring is accurate.
In use, sealing-plug 52 should be detached from 2 venthole 21 of reference cavity, i.e., reference cavity 2 is communicated with current environment.By this reality
It is placed in PE ball valve to be measured, is inflated at this time from external agency into PE ball valve, inner gas pressure takes with novel testing agency
Certainly in testing standard.After inflation, the pressure in reference cavity 2 is the air pressure being equal in ball valve body, and is approximately equal to test pressure
Power.In entire ball valve inner cavity to be measured and reference cavity 2 after stable gas pressure, sealing-plug 52 is pushed to close reference cavity 2, ginseng by motor 4
Examining after chamber 2 is closed becomes an independent cavity, and air pressure therein is approximately equal to measuring air pressure, and remains unchanged.Reference cavity 2 is closed
Afterwards, the air pressure of two test interfaces of differential pressure pick-up 3 will appear difference, between differential pressure pick-up 3 real-time monitoring, two cavitys
Difference, and transfer signals at host computer, if difference is excessive, then it represents that ball valve gas leakage.If difference is in a certain range
Interior fluctuation, then it represents that ball valve is qualified.After testing result obtains, to protect differential pressure pick-up 3, sealing-plug 52 need to be first unclamped, makes to join
It examines 2 air pressure of chamber and ambient pressure is substantially uniform, then carry out the bleed air operation of entire ball valve again.After ball valve is deflated, detection machine
Structure can take out, and continue to be put into another ball valve to be measured.
The utility model is not limited to above-mentioned specific embodiment, and persons skilled in the art are according to the utility model public affairs
The content opened can be implemented the utility model or all using the utility model using other a variety of specific embodiments
Design structure and thinking, do simple change or change, both fall within the protection scope of the utility model.
Claims (10)
1. a kind of PE ball valve Micro blazed-grating testing agency, it is characterised in that: including the built-in fixing seat in ball valve inner cavity to be measured,
Closed reference cavity is installed, reference cavity is equipped with instrument connection and venthole, is also equipped with venthole in fixing seat in fixing seat
Seal assembly and driving seal assembly slide the power mechanism so that seal assembly blocking venthole or disengagement venthole, fixed
Differential pressure pick-up is also equipped on seat, a detection interface of differential pressure pick-up and the instrument connection of reference cavity connect, differential pressure pick-up
Another detection interface be exposed in the sealed internal chamber of ball valve to be measured.
2. PE ball valve Micro blazed-grating testing agency according to claim 1, it is characterised in that: the power mechanism includes electricity
Machine, motor output end are connected with screw rod, and the seal assembly is fixedly installed in nut one end, and the nut other end and screw rod form spiral shell
Line connection, seal assembly and instrument connection cooperate.
3. PE ball valve Micro blazed-grating testing agency according to claim 2, it is characterised in that: be also equipped in the fixing seat
The position-limiting cover that limitation nut circumferentially rotates.
4. PE ball valve Micro blazed-grating testing agency according to claim 3, it is characterised in that: the nut includes being revealed in limit
The accommodating end for appearing end, being placed in position-limiting cover inner hole except the cover of position, the accommodating end and position-limiting cover inner hole form circumferential limit
Position and axial sliding cooperation, what the seal assembly was installed on nut appears end.
5. PE ball valve Micro blazed-grating testing agency according to any one of claims 1-4, it is characterised in that: the sealing group
Part includes seal receptacle and sealing-plug, and seal receptacle is installed on nut one end, and the nut end has the groove being adapted to seal receptacle, sealing
Seat is embedded in groove.
6. PE ball valve Micro blazed-grating testing agency according to claim 5, it is characterised in that: the groove floor is equipped with center
Boss, central protuberance seat pass through in seal receptacle embedding sealing plug.
7. PE ball valve Micro blazed-grating testing agency according to claim 5, it is characterised in that: the seal receptacle is ring junction
Structure, sealing-plug include bottom base and the frustum structure that is axially extended by bottom base, bottom base embedding sealing seat
In interior annular distance, frustum structure and venthole cooperate, and venthole inner wall forms the small conical through-hole of outer imperial palace, the conical through-hole and cone
Platform physical fit, conical through-hole is through connection inside shrink tunnel and reference cavity.
8. PE ball valve Micro blazed-grating testing agency according to claim 6, it is characterised in that: the seal receptacle is ring junction
Structure, sealing-plug include bottom base and the frustum structure that is axially extended by bottom base, bottom base embedding sealing seat
In interior annular distance, frustum structure and venthole cooperate, and venthole inner wall forms the small conical through-hole of outer imperial palace, the conical through-hole and cone
Platform physical fit, for conical through-hole through connection inside shrink tunnel and reference cavity, the central protuberance seat includes perpendicular to groove-bottom
The cylinder in face, cylindrical tip are equipped with frustum seat, and frustum seat basal diameter is greater than body diameter, and the bottom base has and cylinder
The through-hole of adaptation, frustum structure have the groove being adapted to frustum seat.
9. PE ball valve Micro blazed-grating testing agency according to claim 3 or 4, it is characterised in that: the position-limiting cover bottom is solid
Loaded in fixing seat, one end that the motor is connected with screw rod is placed in position-limiting cover inner hole, and the motor other end is held on motor
On seat, motor cabinet is installed in fixing seat.
10. PE ball valve Micro blazed-grating testing agency according to claim 9, it is characterised in that: the seal assembly includes close
Seat and sealing-plug are sealed, seal receptacle is installed on nut one end, and the nut end has the groove being adapted to seal receptacle, and seal receptacle is embedded at
In groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822235072.0U CN209542029U (en) | 2018-12-28 | 2018-12-28 | A kind of PE ball valve Micro blazed-grating testing agency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822235072.0U CN209542029U (en) | 2018-12-28 | 2018-12-28 | A kind of PE ball valve Micro blazed-grating testing agency |
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| CN209542029U true CN209542029U (en) | 2019-10-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489918A (en) * | 2018-12-28 | 2019-03-19 | 中国计量大学 | A kind of PE ball valve Micro blazed-grating testing agency |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489918A (en) * | 2018-12-28 | 2019-03-19 | 中国计量大学 | A kind of PE ball valve Micro blazed-grating testing agency |
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