CN209198077U - A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve - Google Patents
A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve Download PDFInfo
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- CN209198077U CN209198077U CN201822233799.5U CN201822233799U CN209198077U CN 209198077 U CN209198077 U CN 209198077U CN 201822233799 U CN201822233799 U CN 201822233799U CN 209198077 U CN209198077 U CN 209198077U
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- gas ratio
- pressure
- control system
- ratio valve
- driving motor
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Abstract
The utility model discloses a kind of minimum secondary automatic commissioning devices of pressure of gas ratio valve, including objective table, control system and the fixed mechanism controlled by control system, electroconductive elastic sheet group, gas supply mechanism, pressure measuring mechanism and regulating mechanism, in debugging, gas ratio valve is fixed on objective table by fixed mechanism first, then electroconductive elastic sheet group is electrically connected with the intake valve connecting terminal of gas ratio valve and flow control valve connecting terminal, output voltage and electric current are controlled by control system come the aperture of the intake valve of regulating gas proportioning valve and flow control valve, control system controls gas supply mechanism gas supply, and by obtaining data detected by pressure measuring mechanism, it is compared according to the standard value of obtained data and secondary pressure, secondary pressure regulating mechanism is adjusted by controlling to adjust mechanism, realize the automatic debugging of minimum secondary pressure, Easy to operate, the degree of automation and precision are high, can in production process or test raising efficiency.
Description
Technical field
The utility model relates to a kind of valve body flow debugging apparatus, especially a kind of minimum secondary pressure of gas ratio valve is automatic
Commissioning device.
Background technique
Important spare part of the gas ratio valve as gas heater, it is negative to control last heat by controlling secondary pressure
Lotus；Current gas ratio valve in the market is mainly by valve body, and is arranged in the intracorporal intake valve of valve and flow control valve group
At valve body is provided with air inlet and air outlet, and intake valve is used to control the air inflow of air inlet, and flow control valve is for controlling out
The gas output of port is additionally provided with secondary pressure regulating mechanism at gas outlet (for a regulating valve, mainly by controlling the regulating valve valve port
The screw of size and the nut composition for locking the screw), secondary pressure regulating mechanism is used for the air pressure of Secondary Control gas outlet, air inlet
Valve is provided with intake valve connecting terminal, and flow control valve is provided with flow control valve connecting terminal, the intake valve connecting terminal
The surface of valve body is led to from valve inner with flow control valve connecting terminal.
Gas ratio valve generally requires to carry out secondary pressure detection, due to depositing between air inlet and air outlet before factory
In reasons such as crushings, secondary pressure is caused to deviate standard value, it is therefore desirable to secondary to ensure by adjusting secondary pressure regulating mechanism
The accuracy of pressure for the adjusting of the minimum secondary pressure of gas ratio valve is adjusted by manually for manufacturer at present
Section, needs repeatedly to be adjusted and compared, and could adjust minimum secondary pressure to standard value, operate trouble, and efficiency
It is low.
Summary of the invention
For overcome the deficiencies in the prior art, it is secondary to provide a kind of gas ratio valve minimum easy to operate for the utility model
Press automatic commissioning device.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve, comprising:
Objective table is provided with through-hole on the objective table for providing the platform of placement for gas ratio valve to be detected,
The secondary pressure regulating mechanism of the gas ratio valve is located on the axial direction of the through-hole.
Control system, the work for controlling whole equipment are run.
The front of the objective table is arranged in fixed mechanism, is electrically connected with the control system, for fixing the combustion gas
Proportioning valve.
Electroconductive elastic sheet group, including the first conductive contact and the second conductive contact, first conductive contact and the second conduction
The size of the output electric current of connector is controlled by the control system, first conductive contact and the gas ratio valve into
Air valve connecting terminal matches, the flow control valve connecting terminal phase of second conductive contact and the gas ratio valve
Match.
Gas supply mechanism, including air supply pipe and feeder, the feeder are electrically connected with the control system, the confession
One end of tracheae is connected to the air supply opening of the feeder, the air inlet of the other end of the air supply pipe and the gas ratio valve
Mouth connection, the air supply opening of the feeder are provided with first pressure sensor, the first pressure sensor and the control
System electrical connection.
Pressure measuring mechanism, including snorkel, pressure-measuring pipe and second pressure sensor, the nozzle of one end of the snorkel and institute
The gas outlet for stating gas ratio valve matches, and the nozzle of the other end of the snorkel installs calibrating nozzle, the snorkel
Side wall offers pressure tap, and one end of the pressure-measuring pipe and the pressure tap are tightly connected, and the other end and the second pressure pass
Sensor connection, the second pressure sensor are electrically connected with the control system.
Longitudinal rail, first are arranged on the bracket for regulating mechanism, the bracket at the back side including the objective table is arranged in
Telescopic device and the second telescopic device, first telescopic device and the second telescopic device are electrically connected with the control system,
First track base and the second track base are installed, first track base is located at second track base on the longitudinal rail
Lower section is equipped with the first driving motor on first track base, the second driving motor, institute is equipped on second track base
It states the first driving motor and the second driving motor is electrically connected with the control system, first driving motor and the second driving
The output shaft of motor is respectively positioned on the axial direction of the through-hole, and the output shaft of first driving motor passes through first shaft coupling
First adjustment portion is installed, the output shaft of second driving motor is equipped with the second adjustment portion by second shaft coupling, described
The output end of first telescopic device is fixedly connected with first track base, for driving first driving motor along described vertical
Direction guiding rail moves up and down, and the output end of second telescopic device is fixedly connected with second track base, described for driving
Second driving motor is moved up and down along the longitudinal rail.
Display screen, the display screen are electrically connected with the control system.
First driving motor is located at the underface of second driving motor, and second driving motor is hollow electricity
Machine, first adjustment portion sequentially pass through the output shaft of second driving motor and the second driving motor from lower to upper, and
It is accommodated in second adjustment portion.
First adjustment portion includes an adjusting rod, and one end of the adjusting rod is fixedly connected with the first shaft coupling,
The other end of the adjusting rod is provided with driver bit, the driver bit and the head of screw phase on secondary pressure regulating mechanism
Match.
Second adjustment portion includes the casing being mounted in the second shaft coupling and the tune that is arranged in described sleeve pipe
Section pipe, the nozzle of the regulation pipe match with the nut on secondary pressure regulating mechanism.
The fixed mechanism includes bottom plate, and one end of the bottom plate is fixedly mounted on the surface of the objective table, the bottom
The other end of plate is provided with bending plate, and the bottom plate is equipped with laterally disposed screw rod, and the screw rod is far from the gas proportion
One end of valve is equipped with handle, and the other end is equipped with the first support portion, and the bending plate is provided with placed longitudinally support rod, institute
It states support rod and the second support portion is installed close to one end of the gas ratio valve, other end connection drives the support rod mobile
Third telescopic device, the third telescopic device is electrically connected with the control system.
The surface of the objective table is provided with pedestal, and the 4th telescopic device is provided on the pedestal, and the described 4th is flexible
Device is electrically connected with the control system, and the used connector of output end and the snorkel of the 4th telescopic device are fixed to be connected
It connects.
The beneficial effects of the utility model are: the utility model in debugging, passes through fixed mechanism for gas proportion first
Valve is fixed on objective table, then by the intake valve connecting terminal and flow control valve wiring of electroconductive elastic sheet group and gas ratio valve
Terminal electrical connection is controlled output voltage and electric current by control system and adjusted come the intake valve of regulating gas proportioning valve and flow
The aperture of valve, control system control gas supply mechanism gas supply, and by obtaining data detected by pressure measuring mechanism, according to what is obtained
Data and the standard value of minimum secondary pressure compare, and adjust secondary pressure regulating mechanism by controlling to adjust mechanism, realize minimum
The automatic debugging of secondary pressure, it is easy to operate, and debugging efficiency can be effectively improved.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is one of structural decomposition diagram of the utility model；
Fig. 2 is the two of the structural decomposition diagram of the utility model；
Fig. 3 is the structural block diagram of the utility model；
Structural schematic diagram when Fig. 4 is the utility model debugging；
Fig. 5 is the enlarged drawing in Fig. 4 at A；
Fig. 6 is the part-structure exploded view of the utility model.
Specific embodiment
Referring to figs. 1 to Fig. 6, a kind of minimum secondary automatic commissioning device of pressure of gas ratio valve, comprising:
Objective table 1 is provided with logical for providing the platform of placement for gas ratio valve 2 to be detected on the objective table 1
The secondary pressure regulating mechanism in hole 3, the gas ratio valve 2 is located on the axial direction of the through-hole 3.
Control system 4, the work for controlling whole equipment are run.
The front of the objective table 1 is arranged in fixed mechanism 5, is electrically connected with the control system 4, described in fixed
Gas ratio valve 2, in the present embodiment, the fixed mechanism 5 includes bottom plate 29, and one end of the bottom plate 29 is fixedly mounted on described
The surface of objective table 1, the other end of the bottom plate 29 are provided with bending plate 30, and referring to Fig. 4, the bottom plate 29 is located at the combustion gas
The side of proportioning valve 2, the bending plate 30 are located at the top of the gas ratio valve 2, and the bottom plate 29 is equipped with laterally disposed
Screw rod 31, the screw rod 31 is equipped with handle 32 far from one end of the gas ratio valve 2, and the other end is equipped with the first support
Portion 33, the bending plate 30 are provided with placed longitudinally support rod 34, the support rod 34 close to the gas ratio valve 2 one
End is equipped with the second support portion 35, the third telescopic device 36 that other end connection drives the support rod 34 mobile, the third
Telescopic device 36 is electrically connected with the control system 4.
Electroconductive elastic sheet group 6, including the first conductive contact 7 and the second conductive contact 8, first conductive contact 7 and second
The size of the output electric current of conductive contact 8 is controlled by the control system, first conductive contact 7 and the gas proportion
The intake valve connecting terminal of valve matches, the flow control valve terminals of second conductive contact 8 and the gas ratio valve
Son matches.
Gas supply mechanism 9, including air supply pipe and feeder, the feeder is electrically connected with the control system 4, described
One end of air supply pipe is connected to the air supply opening of the feeder, the other end of the air supply pipe and the gas ratio valve 2
Air inlet 41 is connected to, and the air supply opening of the feeder is provided with first pressure sensor, the first pressure sensor and institute
State the electrical connection of control system 4.
Pressure measuring mechanism 10, including snorkel 11, pressure-measuring pipe and second pressure sensor, the pipe of one end of the snorkel 11
The gas outlet 42 of mouth and the gas ratio valve 2 matches, and the nozzle of the other end of the snorkel 11 installs calibrating nozzle, institute
The side wall for stating snorkel 11 offers pressure tap 12, and one end of the pressure-measuring pipe and the pressure tap 12 are tightly connected, the other end
It is connect with the second pressure sensor, the second pressure sensor is electrically connected with the control system 4；In the present embodiment,
The surface of the objective table 1 is provided with pedestal 37, and the 4th telescopic device 38 is additionally provided on the pedestal 37, and the described 4th is flexible
Device 38 is electrically connected with the control system 4, and the used connector 39 of output end of the 4th telescopic device 38 is supplied gas with described
Pipe 11 is fixedly connected.
Regulating mechanism 13, the bracket 14 at the back side including the objective table 1 is arranged in, setting is longitudinal on the bracket 14 leads
Rail 15, the first telescopic device 16 and the second telescopic device 17, first telescopic device 16 and the second telescopic device 17 are and institute
The electrical connection of control system 4 is stated, first track base 18 and the second track base 19 are installed on the longitudinal rail 15, described first leads
Rail chair 18 is located at the lower section of second track base 19, is equipped with the first driving motor 20 on first track base 18, described
Second driving motor 21 is installed on second track base 29, first driving motor 20 and the second driving motor 21 with it is described
Control system 4 is electrically connected, and the output shaft of first driving motor 20 and the second driving motor 21 is respectively positioned on the axis of the through-hole 3
To on direction, the output shaft of first driving motor 20 is equipped with the first adjustment portion 23 by first shaft coupling 22, and described the
The output shaft of two driving motors 21 is equipped with the second adjustment portion 25 by second shaft coupling 24, first telescopic device 16 it is defeated
Outlet is fixedly connected with first track base 18, for driving first driving motor 20 along about 15 longitudinal rail
Mobile, the output end of second telescopic device 17 is fixedly connected with second track base 19, for driving described second to drive
Dynamic motor 21 is moved up and down along the longitudinal rail 15；Specifically, first driving motor 20 is located at the second driving electricity
The underface of machine 21, second driving motor 21 are hollow motor, and first adjustment portion 23 sequentially passes through institute from lower to upper
The output shaft of the second driving motor 21 and the second driving motor 21 is stated, and is accommodated in second adjustment portion 25.
Display screen 35, the display screen 35 are electrically connected with the control system 4, for accessed by display control program 4
Various parameters.
In the present embodiment, the control system 4 is connected with power supply 43, and it is logical that the control system 4 is provided with several
Communication interface, user can connect the equipment such as keyboard and mouse 44 and computer 45 by the communication interface and carry out to the control system 4
It controls and operates.
In the present embodiment, first adjustment portion 23 includes an adjusting rod 26, one end of the adjusting rod 26 and described the
One shaft coupling 22 is fixedly connected, and the other end of the adjusting rod 26 is provided with driver bit, and the driver bit and secondary pressure are adjusted
Head of screw in section mechanism matches, for rotating the head of screw on the secondary pressure regulating mechanism；Second adjustment portion 25
Including the casing 27 being mounted in the second shaft coupling 24 and the regulation pipe 28 being arranged in described sleeve pipe 27, the regulation pipe
28 nozzle matches with the nut on secondary pressure regulating mechanism, for unclamping or locking on the secondary pressure regulating mechanism
Nut.
In the present embodiment, first telescopic device 16, the second telescopic device 17, third telescopic device 36 and the 4th are flexible
Device 38 is telescopic cylinder or driving motor.
In the present embodiment, the automatic debugging process of gas ratio valve is as follows:
Firstly, gas ratio valve 2 to be detected is placed on the objective table 1, and make the two of the gas ratio valve 2
Secondary pressure regulating mechanism is located on the axial direction of the through-hole 3, at this point, the air inlet 41 of gas ratio valve is against the objective table
1 surface, air supply pipe are penetrated from the back side of the objective table 1, are connected to the air inlet 41 of the gas ratio valve 2,
Then, the 4th telescopic device 38 is driven by control system 4, it is made to drive the snorkel 11 and the gas ratio valve
2 gas outlet 42 is tightly connected connection, and controls the third telescopic device 36, drives the support rod 34 mobile, makes described
Second support portion 35 is bonded with the upper surface of the gas ratio valve 2, while driving the screw rod by rotating the handle 32
31 is mobile, is bonded first adjustment portion 23 and the side of the gas ratio valve 2, to realize consolidating for gas ratio valve 2
It is fixed, then, the intake valve connecting terminal of first conductive contact 7 and the gas ratio valve 2 is connected, described second is led
The flow control valve connecting terminal of electric connection 8 and the gas ratio valve 2 is connected, and controls described the by the control system 4
One conductive contact, 7 output voltage opens the intake valve, and controls second conductive contact 8 and export constant current to control stream
Then the aperture of adjustable valve controls feeder by the control system 4 and supplies to air inlet 41, the first pressure
Sensor obtains the atmospheric pressure value of input gas, and transfers data to the control system 4, facilitates user to control input air pressure
Size, then, control system 4 obtain second pressure sensor detected by atmospheric pressure value, and with minimum secondary pressure standard
Value comparison, if the range beyond minimum secondary pressure standard value, the control system 4 control the second telescopic device 17 first,
Make second telescopic device 17 that the second track base 19 be driven to move up, to make second driving motor 21 to moving up
Dynamic, the nut on the secondary pressure regulating mechanism of regulation pipe 28 and gas ratio valve contacts, and controls second telescopic device
17 stoppings movement, control system 4 drive the second driving motor 21 to rotate forward, and unclamp nut, and subsequent second driving motor 21 stops
Rotation stop is dynamic, and control system 4 drives first telescopic device 16, make first telescopic device 16 drive the first track base 18 to
Upper movement, to make first driving motor 20 move up, until the driver bit and gas ratio valve 2 on adjusting rod 26
Secondary pressure regulating mechanism on head of screw contact, control system 4 controls 16 stopping of the first telescopic device movement, then,
Control system 4 drives first driving motor 20 to rotate forward or backwards, and rotation adjusts screw, until second pressure sensor
Detected numerical value then controls first driving motor 20 and stops operating in the range of minimum secondary pressure standard value,
Subsequent control system 4 drives second driving motor 21 to rotate backward, until locking nut, just controls the second driving electricity
Machine 21 stops operating, finally first telescopic device 16 and the second telescopic device 17 simultaneously again, it is made to drive described first to lead
Rail chair 18 and the second track base 19 move down, to drive first driving motor 20 and the second driving motor 21 to moving down
It is dynamic, then complete the debugging of a gas ratio valve secondary pressure.
In the present embodiment, can by parameters such as the revolving speed and the torques that control first driving motor, to reach quickly,
Minimum secondary pressure is accurately adjusted, can be improved the efficiency of adjusting, and ensure precision, it is easy to operate, it is convenient.
Above embodiment cannot limit the protection scope of the invention, and the personnel of professional skill field are not departing from
In the case where the invention general idea, the impartial modification and variation done still fall within the range that the invention is covered
Within.
Claims (7)
1. a kind of minimum secondary automatic commissioning device of pressure of gas ratio valve, it is characterised in that it includes:
Objective table (1) is provided on the objective table (1) for providing the platform placed for gas ratio valve to be detected (2)
The secondary pressure regulating mechanism of through-hole (3), the gas ratio valve (2) is located on the axial direction of the through-hole (3)；
Control system (4), the work for controlling whole equipment are run；
Fixed mechanism (5) is arranged in the front of the objective table (1), is electrically connected with the control system (4), for fixing
State gas ratio valve (2)；
Electroconductive elastic sheet group (6), including the first conductive contact (7) and the second conductive contact (8), first conductive contact (7) and
Second conductive contact (8) output electric current size by the control system (4) control, first conductive contact (7) with
The intake valve connecting terminal of the gas ratio valve (2) matches, second conductive contact (8) and the gas ratio valve
(2) flow control valve connecting terminal matches；
Gas supply mechanism (9), including air supply pipe and feeder, the feeder is electrically connected with the control system (4), described
One end of air supply pipe is connected to the air supply opening of the feeder, the other end of the air supply pipe and the gas ratio valve (2)
Air inlet (41) connection, the air supply opening of the feeder is provided with first pressure sensor, the first pressure sensor
It is electrically connected with the control system (4)；
Pressure measuring mechanism (10), including snorkel (11), pressure-measuring pipe and second pressure sensor, one end of the snorkel (11)
The gas outlet (42) of nozzle and the gas ratio valve (2) matches, and the nozzle of the other end of the snorkel (11) installs mark
The side wall of quasi- nozzle, the snorkel (11) offers pressure tap (12), one end of the pressure-measuring pipe and the pressure tap (12)
It is tightly connected, the other end is connect with the second pressure sensor, the second pressure sensor and the control system (4) electricity
Connection；
Regulating mechanism (13), including the bracket (14) at the back side of the objective table (1) is arranged, setting is vertical on the bracket (14)
Direction guiding rail (15), the first telescopic device (16) and the second telescopic device (17), first telescopic device (16) and second are stretched
Device (17) is electrically connected with the control system (4), and the first track base (18) and are equipped on the longitudinal rail (15)
Two track bases (19), first track base (18) are located at the lower section of second track base (19), first track base
(18) it is equipped on the first driving motor (20), is equipped with the second driving motor (21) on second track base (19), it is described
First driving motor (20) and the second driving motor (21) are electrically connected with the control system (4), first driving motor
(20) it is respectively positioned on the axial direction of the through-hole (3) with the output shaft of the second driving motor (21), first driving motor
(20) output shaft is equipped with the first adjustment portion (23) by first shaft coupling (22), the output of second driving motor (21)
Axis is equipped with the second adjustment portion (25) by second shaft coupling (24), the output end of first telescopic device (16) and described the
One track base (18) is fixedly connected, for driving first driving motor (20) to move up and down along the longitudinal rail (15),
The output end of second telescopic device (17) is fixedly connected with second track base (19), for driving second driving
Motor (21) is moved up and down along the longitudinal rail (15).
2. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 1, it is characterised in that described first
Driving motor (20) is located at the underface of second driving motor (21), and second driving motor (21) is hollow motor,
First adjustment portion (23) sequentially passes through second driving motor (21) and the second driving motor (21) from lower to upper
Output shaft, and be accommodated in second adjustment portion (25).
3. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 2, it is characterised in that described first
Adjustment portion (23) includes an adjusting rod (26), and one end of the adjusting rod (26) is fixedly connected with the first shaft coupling (22),
The other end of the adjusting rod (26) is provided with driver bit, the driver bit and the head of screw phase on secondary pressure regulating mechanism
Matching.
4. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 2, it is characterised in that described second
Adjustment portion (25) includes the tune of the casing (27) being mounted on the second shaft coupling (24) and setting in described sleeve pipe (27)
Section pipe (28), the nozzle of the regulation pipe (28) match with the nut on secondary pressure regulating mechanism.
5. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 1, it is characterised in that the fixation
Mechanism (5) includes bottom plate (29), and one end of the bottom plate (29) is fixedly mounted on the surface of the objective table (1), the bottom plate
(29) the other end is provided with bending plate (30), and the bottom plate (29) is equipped with laterally disposed screw rod (31), the screw rod
(31) one end far from the gas ratio valve (2) is equipped with handle (32), and the other end is equipped with the first support portion (33), described
Bending plate (30) is vertically arranged with placed longitudinally support rod (34), and the support rod (34) is close to the gas ratio valve (2)
One end be equipped with the second support portion (35), the third telescopic device that other end connection drives the support rod (34) mobile
(36), the third telescopic device (36) is electrically connected with the control system (4).
6. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 1, it is characterised in that the loading
The surface of platform (1) is provided with pedestal (37), and the 4th telescopic device (38), the described 4th flexible dress are provided on the pedestal (37)
It sets (38) to be electrically connected with the control system (4), the used connector of output end (39) of the 4th telescopic device (38) and institute
Snorkel (11) is stated to be fixedly connected.
7. the minimum secondary automatic commissioning device of pressure of gas ratio valve according to claim 1, it is characterised in that it further includes
Display screen (40), the display screen (40) are electrically connected with the control system (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822233799.5U CN209198077U (en) | 2018-12-28 | 2018-12-28 | A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822233799.5U CN209198077U (en) | 2018-12-28 | 2018-12-28 | A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve |
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| Publication Number | Publication Date |
|---|---|
| CN209198077U true CN209198077U (en) | 2019-08-02 |
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ID=67430759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822233799.5U Active CN209198077U (en) | 2018-12-28 | 2018-12-28 | A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve |
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| Country | Link |
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| CN (1) | CN209198077U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612720A (en) * | 2018-12-28 | 2019-04-12 | 中山市万合检测设备开发有限公司 | A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve |
-
2018
- 2018-12-28 CN CN201822233799.5U patent/CN209198077U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612720A (en) * | 2018-12-28 | 2019-04-12 | 中山市万合检测设备开发有限公司 | A kind of minimum secondary automatic commissioning device of pressure of gas ratio valve |
| CN109612720B (en) * | 2018-12-28 | 2023-12-15 | 中山市万合检测设备开发有限公司 | Automatic debugging equipment for minimum secondary pressure of fuel gas proportional valve |
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