CN104847653A - Regulating and controlling valve - Google Patents
Regulating and controlling valve Download PDFInfo
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- CN104847653A CN104847653A CN201510277260.8A CN201510277260A CN104847653A CN 104847653 A CN104847653 A CN 104847653A CN 201510277260 A CN201510277260 A CN 201510277260A CN 104847653 A CN104847653 A CN 104847653A
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- spool
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Abstract
The invention discloses a regulating and controlling valve which comprises a valve sleeve and a partition. The partition is arranged in the valve sleeve and divides an inner cavity of the valve sleeve into a main control cavity and a regulating and controlling cavity, an annular air incoming groove is formed in the middle of the outer wall of the valve sleeve, a left air groove and a right air groove which are symmetric are formed in two sides of the air incoming groove and communicated with air chambers on corresponding lateral sides respectively, a left exhaust groove and a right exhaust groove which are symmetric are formed in the outermost side respectively, an air hole communicating the main control cavity with the regulating and controlling cavity is formed in the bottom of the air incoming groove, an air hole communicated with the main control cavity is formed in the bottom of each of the left air groove, the right air groove, the left exhaust groove and the right exhaust groove, and a third ventilation hole and a fourth ventilation hole are formed in the partition.
Description
Technical field
The present invention relates to a kind of adjusting control valve.
Background technique
Claimant finds a kind of membrane pump with pneumatic drive (patent No.: 2012101329572) of claimant Anhui Lechang Pneumatic Fluid Equipment Technology Co., Ltd. application by retrieval, it discloses the product similar with the present invention, its air pressure adopting source of the gas to produce as power in order to drive the bilateral reciprocation of diaphragm; Poppet shaft (being equivalent to regulation and control axle of the present invention) is socketed on centre valve in-core by it, and spool two ends, center are provided with step chamber, and the interior edge face of end spool is provided with secondary ring-shaped step; The complex structure of center spool and end spool, adds cost of production.
Summary of the invention
Technical problem to be solved by this invention is, existing membrane pump with pneumatic drive complex structure, sealing requirements is high, and fabricating cost is high, and working life is short.
The present invention is for solving the problems of the technologies described above, and the technological scheme of employing is.
Adjusting control valve comprises valve pocket, dividing plate, be provided with dividing plate in valve pocket and valve pocket inner chamber be separated into master control chamber and regulation and control chamber, the outer wall neutral position of valve pocket is provided with the air inlet duct of annular, the both sides of air inlet duct are provided with symmetrical left air drain and right air drain, left air drain is communicated with the air chamber of respective side respectively with right air drain, outermostly be respectively symmetrical left bank air drain and right air vent, the bottom of air inlet duct is provided with the pore being communicated with master control chamber and regulation and control chamber, left air drain, right air drain, left bank air drain is provided with the bottom of right air vent the pore being communicated with master control chamber, dividing plate is arranged the 3rd air hole and the 4th air hole,
In master control air chamber, flip sleeve is connected to centre valve core, the sidewall of center spool is provided with the air inlet groove of annular, air inlet groove is communicated with the pore bottom air inlet duct all the time, the two ends of center spool are provided with left coupling shaft and right coupling shaft, the two ends of master control air chamber are respectively arranged with the master control left end spool and master control right-hand member spool that match, master control left end spool is provided with the left step chamber matched with the left coupling shaft of center spool, form left chamber between left step chamber and left coupling shaft, left chamber is communicated with regulation and control chamber by the 3rd air hole; Master control right-hand member spool is provided with the right step chamber matched with the right coupling shaft of center spool, forms right chamber between right step chamber and right coupling shaft, right chamber is communicated with regulation and control chamber by the 4th air hole;
Regulation and control axle is slidably connected in regulation and control chamber, regulation and control axle is provided with the left lug boss of two ends symmetry and right lug boss, region on regulation and control axle between left lug boss and right lug boss is the air inlet area of regulation and control axle, it is left exhaust area that regulation and control axle is positioned at left lug boss left end region, it is right exhaust area that regulation and control axle is positioned at right lug boss right end region, and the air inlet area of regulation and control axle is communicated with the pore bottom air inlet duct all the time; The two ends of regulation and control chamber are respectively arranged with regulation and control left end spool and regulation and control right-hand member spool, regulation and control left end spool is provided with the first air hole being communicated with left exhaust area and exhaust passage, regulation and control right-hand member spool is provided with the second air hole being communicated with right exhaust area and exhaust passage.
The further improvement of such scheme.
Distance between the left end of left lug boss and the left end of right lug boss equals the distance between the 3rd air hole and the 4th air hole, and the distance between the right-hand member of left lug boss and the right-hand member of right lug boss equals the distance between the 3rd air hole and the 4th air hole.
The invention has the advantages that, the poppet shaft (being equivalent to regulation and control axle of the present invention) in documents is socketed on centre valve in-core, and the sealing requirements at two ends, poppet shaft left and right is higher, prevents gas leakage; Degassing function is played at regulation and control axle two ends of the present invention, to sealing no requirement (NR), therefore not easily leaks gas, relative to documents better tightness of the present invention; Regulation and control axle is arranged at above the spool of center, replaces poppet shaft of the prior art and be slidably socketed in centre valve in-core, reduce the production difficulty of center spool; And the air inlet of left/right chamber to be separated with giving vent to anger with the air inlet of left/right air chamber with giving vent to anger, mutual noninterference, to ensure that gas flow is more stable, increasing the stability of equipment.
The method of membrane pump with pneumatic drive extracting liquid and the working principle of membrane pump with pneumatic drive.
Adjusting control valve original state: left lug boss and the right lug boss of regulation and control axle block the 3rd air hole and the 4th air hole respectively;
Source of the gas enters the pore bottom air inlet duct by gas-entered passageway, gas enters in the regulation and control air inlet area of axle and the air inlet groove of center spool respectively, because the 3rd air hole and the 4th air hole are blocked by the lug boss regulating and controlling axle, the chamber at spool two ends, center forms airtight space, center spool can not move, and due under the state that regulation and control axle can not be in equilibrium of forces completely, air pressure promotes the axial side of regulation and control and moves;
Suppose, regulation and control axle moves under the influence of air pressure to the left, in the regulation and control left exhaust area of axle, gas is discharged by the first air hole being arranged at regulation and control axle left end, the regulation and control right exhaust area of axle communicates with the exhaust passage of the pump housing, regulation and control axle right exhaust area volume increases, and the air inlet area regulating and controlling axle is communicated with the 3rd air hole, 4th air hole is communicated with the right exhaust area of regulation and control axle right-hand member, gas is through the air inlet area of regulation and control axle, 3rd air hole enters in the left chamber of center spool left end, along with the air pressure in left chamber increases, gas push center spool moves to right, and get rid of the right chamber indoor gas of centre valve core right-hand member, center spool moves to right in process, the air inlet groove be arranged on spool side, center is utilized to be communicated with air inlet duct and right air drain, source of the gas flows in right air drain by air inlet duct, and in the right air chamber of final inflow, in right air chamber, gas volume progressively increases, right diaphragm is upheld distortion and is driven the contraction deformation of left diaphragm by the interlock effect of central shaft, gas in left air chamber is through left air drain, master control chamber, left bank air drain enters in exhaust passage, realize the intake process of the exhaust of left air cavity and right air cavity,
Promote regulation and control axle in the contraction deformation process of left diaphragm to move to right, make the air inlet area of axle be separated with the 3rd air hole and be communicated with the 4th air hole, 3rd air hole is communicated with the regulation and control left exhaust area of axle, source of the gas is by the air inlet area of regulation and control axle, 4th air hole enters in right chamber, along with gas progressively increases, promotion center spool is moved to the left, and by the gas in left chamber through the 3rd air hole, left exhaust area, first air hole enters in exhaust passage, center spool is moved to the left in process, air inlet groove is made to depart from right air drain and be communicated with left air drain, source of the gas passes through air inlet duct, air inlet groove, left air drain enters in left air chamber, meanwhile, right air chamber is through right air drain, master control chamber, right air vent is communicated with exhaust passage, in left air chamber intake process, right air chamber is in exhaust process, and left diaphragm occurs to uphold distortion, and right diaphragm shrinks distortion,
And so forth, realize regulation and control the swinging of axle, and the inflation of left and right air chamber and exhaust process; Left diaphragm upholds distortion drives right diaphragm contraction deformation by the interlock effect of central shaft, and now, left liquid container volume reduces, right liquid container volume increases, under the effect of dash ball, left liquid container is in discharge liquid process, and right liquid container is in absorbing fluid process; In like manner, right diaphragm upholds distortion drives left diaphragm contraction deformation by the interlock effect of central shaft, realizes right liquid container and discharges liquid, left liquid container absorbing fluid.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is membrane pump with pneumatic drive state one structural representation of the present invention.
Fig. 2 is adjusting control valve state one structural representation of the present invention.
Fig. 3 is adjusting control valve state two structural representation of the present invention.
Fig. 4 is adjusting control valve state three structural representation of the present invention.
Fig. 5 is adjusting control valve state four structural representation of the present invention.
Fig. 6 is adjusting control valve state five structural representation of the present invention.
Fig. 7 is adjusting control valve state six structural representation of the present invention.
100, the pump housing; 110a, left liquid container; 110b, right liquid container; 120a, left air chamber; 120b, right air chamber; 130, central shaft; 140, inlet triplet for water; 150, outlet three way; 160, dash ball.
200, adjusting control valve; 210, air inlet duct; 220a, left air drain; 220b, right air drain; 230a, left bank air drain; 230b, right air vent; 240, chamber is regulated and controled; 250, master control chamber.
260, axle is regulated and controled; 262a, left lug boss; 262b, right lug boss; 264, air inlet area; 266a, left exhaust area; 266b, right exhaust area; 270a, regulation and control left end spool; 270b, regulation and control right-hand member spool; 272a, the first air hole; 272b, the second air hole.
280, center spool; 282, air inlet groove; 284a, left chamber; 284b, right chamber.
290a, master control left end spool; 290b, master control right-hand member spool; 292a, the 3rd air hole; 292b, the 4th air hole.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisite, and the every other embodiment obtained, belongs to scope.
As shown in figs. 1-7, the invention provides a kind of membrane pump with pneumatic drive, it comprises the pump housing 100, the top and bottom of the pump housing 100 are respectively arranged with outlet three way 150, inlet triplet for water 140, left end and the right-hand member of the pump housing 100 are respectively arranged with the left liquid container 110a and right liquid container 110b that are communicated with inlet triplet for water 140 with outlet three way 150, the joint of left liquid container 110a and outlet three way 150 and inlet triplet for water 140 is respectively arranged with dash ball 160, and the joint of right liquid container 110b and outlet three way 150 and inlet triplet for water 140 is respectively arranged with dash ball 160; The centre of the pump housing 100 is provided with centerbody and is provided with adjusting control valve 200 in centerbody, adjusting control valve 200 is for controlling the flow direction of source of the gas, centerbody also slidably connects central shaft 130, the two ends, left and right of central shaft 130 are fixedly connected with left diaphragm and right diaphragm respectively, left diaphragm and centerbody form left air chamber 120a, form right air chamber 120b between right diaphragm and centerbody.
Adjusting control valve 200 comprises valve pocket, dividing plate, be provided with dividing plate in valve pocket and valve pocket inner chamber be separated into master control chamber 250 and regulation and control chamber 240, the neutral position of the outer wall of valve pocket is provided with the air inlet duct 210 of annular, the both sides of air inlet duct 210 are provided with symmetrical left air drain 212a and right air drain 212b, left air drain 212a is communicated with left air chamber 120a, right air drain 212b is communicated with right air chamber 120b, outermostly be respectively symmetrical left bank air drain 214a and right air vent 214b, the bottom of air inlet duct 210 is provided with the pore being communicated with master control chamber 250 and regulation and control chamber 240, left air drain 212a, right air drain 212b, left bank air drain 214a is provided with the bottom of right air vent 214b the pore being communicated with master control chamber 250, dividing plate is arranged the 3rd air hole 292a and the 4th air hole 292b.
In master control air chamber 250, flip sleeve is connected to centre valve core 280, the sidewall of center spool 280 is provided with the air inlet groove 282 of annular, air inlet groove 282 is communicated with the pore bottom air inlet duct 210 all the time, the two ends of center spool 280 are provided with coupling shaft, the two ends of master control air chamber 250 are respectively arranged with the master control left end spool 290a and master control right-hand member spool 290b that match, master control left end spool 290a is provided with the left step chamber matched with the left coupling shaft of center spool 280, left chamber 284a is formed between left step chamber and left coupling shaft, left chamber 284a is communicated with regulation and control chamber 240 by the 3rd air hole 292a, in like manner, master control right-hand member spool 290b is provided with the right step chamber matched with the right coupling shaft of center spool 280, forms right chamber 284b between right step chamber and right coupling shaft, right chamber 284b is communicated with regulation and control chamber 240 by the 4th air hole 292b.
Regulation and control axle 260 is slidably connected in regulation and control chamber 240, regulation and control axle 260 is provided with the left lug boss 262a of two ends symmetry and right lug boss 262b, region on regulation and control axle 260 between left lug boss 262a and right lug boss 262b is the air inlet area 264 of regulation and control axle 260, it is left exhaust area 266a that regulation and control axle 260 is positioned at left lug boss 262a left end region, it is right exhaust area 266b that regulation and control axle 260 is positioned at right lug boss 262b right end region, and the air inlet area 264 of regulation and control axle 260 is communicated with the pore bottom air inlet duct 210 all the time; The two ends of regulation and control chamber 240 are respectively arranged with regulation and control left end spool 270a and regulation and control right-hand member spool 270b, regulation and control left end spool 270a is provided with the first air hole 272a being communicated with left exhaust area 266a and exhaust passage, regulation and control right-hand member spool 270 is provided with the second air hole 272b being communicated with right exhaust area 266b and exhaust passage.
Because the pore bottom air inlet duct is communicated with the regulation and control air inlet area of axle and the air inlet groove of center spool simultaneously, because regulation and control axle and center spool can not be in equilibrium of forces state completely, air pressure may drive regulation and control Zhou Yu center valve core movement simultaneously, its motion state is more, make device unstable, but it still can normal pumping work; For increasing the stability of membrane pump with pneumatic drive, distance between the left end of left lug boss 262a and the left end of right lug boss equals the distance between the 3rd air hole and the 4th air hole, in like manner, the distance between the right-hand member of left lug boss 262a and the right-hand member of right lug boss equals the distance between the 3rd air hole and the 4th air hole; During original state, left lug boss 262a and right lug boss 262b blocks the 3rd air hole and the 4th air hole respectively, make left chamber 284a and right chamber 284b be in sealing state, during pneumatic diaphragm pump startup, center spool can not move and regulation and control axle can only be relied on to move to regulate center spool.
The working principle of membrane pump with pneumatic drive.
Adjusting control valve original state: left lug boss and the right lug boss of regulation and control axle block the 3rd air hole and the 4th air hole respectively.
Source of the gas enters in air inlet duct by gas-entered passageway, by the pore bottom air inlet duct, source of the gas enters in the regulation and control air inlet area of axle and the air inlet groove of center spool respectively, because the 3rd air hole and the 4th air hole are blocked by the lug boss regulating and controlling axle, the chamber at spool two ends, center forms airtight space, center spool can not move, and due to regulation and control axle can not be in equilibrium of forces completely state under, air pressure promote regulation and control axial side move.
Suppose, regulation and control axle moves under the influence of air pressure to the left, in the regulation and control left exhaust area of axle, gas is discharged by the first air hole being arranged at regulation and control axle left end, the regulation and control right exhaust area of axle communicates with the exhaust passage of the pump housing, regulation and control axle right exhaust area volume increases, and the air inlet area regulating and controlling axle is communicated with the 3rd air hole, 4th air hole is communicated with the right exhaust area of regulation and control axle right-hand member, gas is through the air inlet area of regulation and control axle, 3rd air hole enters in the left chamber of center spool left end, along with the air pressure in left chamber increases, gas push center spool moves to right, and get rid of the right chamber indoor gas of centre valve core right-hand member, center spool moves to right in process, the air inlet groove be arranged on spool side, center is utilized to be communicated with air inlet duct and right air drain, source of the gas flows in right air drain by air inlet duct, and in the right air chamber of final inflow, in right air chamber, gas volume progressively increases, right diaphragm is upheld distortion and is driven the contraction deformation of left diaphragm by the interlock effect of central shaft, gas in left air chamber is through left air drain, master control chamber, left bank air drain enters in exhaust passage, realize the intake process of the exhaust of left air cavity and right air cavity.
Promote regulation and control axle in the contraction deformation process of left diaphragm to move to right, make the air inlet area of axle be separated with the 3rd air hole and be communicated with the 4th air hole, 3rd air hole is communicated with the regulation and control left exhaust area of axle, source of the gas is by the air inlet area of regulation and control axle, 4th air hole enters in right chamber, along with gas progressively increases, promotion center spool is moved to the left, and by the gas in left chamber through the 3rd air hole, left exhaust area, first air hole enters in exhaust passage, center spool is moved to the left in process, air inlet groove is made to depart from right air drain and be communicated with left air drain, source of the gas passes through air inlet duct, air inlet groove, left air drain enters in left air chamber, meanwhile, right air chamber is through right air drain, master control chamber, right air vent is communicated with exhaust passage, in left air chamber intake process, right air chamber is in exhaust process, and left diaphragm occurs to uphold distortion, and right diaphragm shrinks distortion.
And so forth, realize regulation and control the swinging of axle, and the inflation of left and right air chamber and exhaust process; Left diaphragm upholds distortion drives right diaphragm contraction deformation by the interlock effect of central shaft, and now, left liquid container volume reduces, right liquid container volume increases, under the effect of dash ball, left liquid container is in discharge liquid process, and right liquid container is in absorbing fluid process; In like manner, right diaphragm upholds distortion drives left diaphragm contraction deformation by the interlock effect of central shaft, realizes right liquid container and discharges liquid, left liquid container absorbing fluid.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, the General Principle defined in the present invention when not departing from spirit of the present invention or scope, can realize in other embodiments.Therefore, the present invention can not be defined to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (2)
1. adjusting control valve, it is characterized in that, comprise valve pocket, dividing plate, be provided with dividing plate in valve pocket and valve pocket inner chamber be separated into master control chamber and regulation and control chamber, the outer wall neutral position of valve pocket is provided with the air inlet duct of annular, the both sides of air inlet duct are provided with symmetrical left air drain and right air drain, left air drain is communicated with the air chamber of respective side respectively with right air drain, outermostly be respectively symmetrical left bank air drain and right air vent, the bottom of air inlet duct is provided with the pore being communicated with master control chamber and regulation and control chamber, left air drain, right air drain, left bank air drain is provided with the bottom of right air vent the pore being communicated with master control chamber, dividing plate is arranged the 3rd air hole and the 4th air hole,
In master control air chamber, flip sleeve is connected to centre valve core, the sidewall of center spool is provided with the air inlet groove of annular, air inlet groove is communicated with the pore bottom air inlet duct all the time, the two ends of center spool are provided with left coupling shaft and right coupling shaft, the two ends of master control air chamber are respectively arranged with the master control left end spool and master control right-hand member spool that match, master control left end spool is provided with the left step chamber matched with the left coupling shaft of center spool, form left chamber between left step chamber and left coupling shaft, left chamber is communicated with regulation and control chamber by the 3rd air hole; Master control right-hand member spool is provided with the right step chamber matched with the right coupling shaft of center spool, forms right chamber between right step chamber and right coupling shaft, right chamber is communicated with regulation and control chamber by the 4th air hole;
Regulation and control axle is slidably connected in regulation and control chamber, regulation and control axle is provided with the left lug boss of two ends symmetry and right lug boss, region on regulation and control axle between left lug boss and right lug boss is the air inlet area of regulation and control axle, it is left exhaust area that regulation and control axle is positioned at left lug boss left end region, it is right exhaust area that regulation and control axle is positioned at right lug boss right end region, and the air inlet area of regulation and control axle is communicated with the pore bottom air inlet duct all the time; The two ends of regulation and control chamber are respectively arranged with regulation and control left end spool and regulation and control right-hand member spool, regulation and control left end spool is provided with the first air hole being communicated with left exhaust area and exhaust passage, regulation and control right-hand member spool is provided with the second air hole being communicated with right exhaust area and exhaust passage.
2. adjusting control valve according to claim 1, distance between the left end of left lug boss and the left end of right lug boss equals the distance between the 3rd air hole and the 4th air hole, and the distance between the right-hand member of left lug boss and the right-hand member of right lug boss equals the distance between the 3rd air hole and the 4th air hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277260.8A CN104847653A (en) | 2015-05-27 | 2015-05-27 | Regulating and controlling valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277260.8A CN104847653A (en) | 2015-05-27 | 2015-05-27 | Regulating and controlling valve |
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| Publication Number | Publication Date |
|---|---|
| CN104847653A true CN104847653A (en) | 2015-08-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510277260.8A Pending CN104847653A (en) | 2015-05-27 | 2015-05-27 | Regulating and controlling valve |
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| CN (1) | CN104847653A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4406596A (en) * | 1981-03-28 | 1983-09-27 | Dirk Budde | Compressed air driven double diaphragm pump |
| US5584666A (en) * | 1994-10-17 | 1996-12-17 | Ingersoll-Rand Company | Reduced icing air valve |
| US20070065305A1 (en) * | 2005-09-16 | 2007-03-22 | Almatec Maschinenbau Gmbh | Diaphragm pump for the transport of liquids |
| CN201241812Y (en) * | 2008-08-20 | 2009-05-20 | 石家庄中煤装备制造有限公司 | Changing-over valve of pneumatic diaphragm pump for with |
| CN201474929U (en) * | 2009-08-31 | 2010-05-19 | 李建玮 | Anti-clamping diaphragm pump of air valve system |
| CN102705207A (en) * | 2012-04-28 | 2012-10-03 | 安徽乐昌气动流体设备科技有限公司 | Pneumatic diaphragm pump |
| CN202468240U (en) * | 2012-03-19 | 2012-10-03 | 德帕姆(杭州)泵业科技有限公司 | Pneumatic type two diaphragm pump of sliding valve reversing mechanism |
| CN204663858U (en) * | 2015-05-27 | 2015-09-23 | 张伟伟 | Adjusting control valve |
-
2015
- 2015-05-27 CN CN201510277260.8A patent/CN104847653A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4406596A (en) * | 1981-03-28 | 1983-09-27 | Dirk Budde | Compressed air driven double diaphragm pump |
| US5584666A (en) * | 1994-10-17 | 1996-12-17 | Ingersoll-Rand Company | Reduced icing air valve |
| US20070065305A1 (en) * | 2005-09-16 | 2007-03-22 | Almatec Maschinenbau Gmbh | Diaphragm pump for the transport of liquids |
| CN201241812Y (en) * | 2008-08-20 | 2009-05-20 | 石家庄中煤装备制造有限公司 | Changing-over valve of pneumatic diaphragm pump for with |
| CN201474929U (en) * | 2009-08-31 | 2010-05-19 | 李建玮 | Anti-clamping diaphragm pump of air valve system |
| CN202468240U (en) * | 2012-03-19 | 2012-10-03 | 德帕姆(杭州)泵业科技有限公司 | Pneumatic type two diaphragm pump of sliding valve reversing mechanism |
| CN102705207A (en) * | 2012-04-28 | 2012-10-03 | 安徽乐昌气动流体设备科技有限公司 | Pneumatic diaphragm pump |
| CN204663858U (en) * | 2015-05-27 | 2015-09-23 | 张伟伟 | Adjusting control valve |
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Application publication date: 20150819 |