PISCO VK Series Скачать руководство пользователя страница 20 | Manualshive

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PISCO VK Series Скачать руководство пользователя страница 20

MODE

ME

S1S2

SW1

SW2

■ Electric circuit diagram (Solenoid valve)

Suction solenoid valve

alone

Suction solenoid valve &

Blow-off solenoid valve

Suction solenoid valve

alone

Suction solenoid valve &

Blow-off solenoid valve

DC24V

AC100V

-0V

(Black)

+24V

(Red)

0V

+24V

(Black)

(Red)

0V

(White)

Suction

solenoid valve

Common

Blow-off

solenoid valve

(

～

) Blue

(

～

) Blue

+

-

(White)

(Blue)

(Black)

(

～

)Common

(

～

)

Suction

solenoid valve

(

～

)Blow-off

solenoid valve

+

-

+

-

■ How to insert and disconnect

1. How to insert and disconnect tubes

①

Tube insertion

Insert a tube into Push-In Fitting of the vacuum generator VK up to the tube
end. Lock-claws bite the tube to fix it and the elastic sleeve seals around
the tube. Refer to

“

2. Instructions for Tube Insertion

”

under

“

Common Safety

Instructions for Fittings

”

.

②

Tube disconnection

The tube is disconnected by pushing release-ring to release Lock-claws.
Make sure to stop air supply before the tube disconnection.

2. How to fix the product

In order to fix the vacuum generator VK, tighten M3 threads
through the fixing holes on the resin body with tightening
torque 0.4 to 0.5Nm. Refer to the outer dimensional
drawings for the hole pitch.

http://www.pisco.com

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Содержание VK Series

Страница 1: ...Diversified Applications Vacuum Generator VK Series Selection of the most suitable module for your application is possible by the modularized each unit and rich combination of units Combinations A B C D E F G H J K L M P Q R S T W Filter Ejector Suction solenoid valve Check valve vacuum retention function Mechanical vacuum switch Vacuum switch with LED display Air timer type blow off valve Blow of...

Страница 2: ...o enhance visibility Two types of vacuum switch 2 switch output 1 switch output with 1 analog output are available depending on the desired application 4 Standard nozzle bores are 05 ø0 5mm 07 ø0 7mm 10 ø10mm and 12 ø1 2mm Blow Off Mechanism can be selectable from solenoid valve type and air timer air chamber type The built in switching valve realizes fine tuning of quick blow off air and fine adj...

Страница 3: ...ay Easy adjustment of vacuum level by the LED display 2 types of output are available 2 switch output and 1 switch output with analog output Blow off Solenoid Valve R The solenoid valve functions to release a work piece from a vacuum pad Blow off air is generated during the electric power supply Suction Solenoid Valve S The solenoid valve generates vacuum Compressor Vacuum Pad VKA W Blow off solen...

Страница 4: ...27l min ANR 93kPa 38l min ANR 67kPa 40l min ANR 67kPa 50l min ANR 91kPa 21l min ANR 91kPa 27l min ANR 46l min ANR 34l min ANR 70l min ANR 47l min ANR Manifold base alone 10 12 No code 1 0mm 1 2mm Manifold base alone S E 1 4 Rated supply pressure 72 5 psi 0 5MPa 26 8inHg 0 25scfm 19 8inHg 0 42scfm 0 41scfm 27 6inHg 0 46scfm 19 8inHg 0 91scfm 27inHg 0 37scfm 0 81scfm 0 60scfm 27 6inHg 0 95scfm 19 8i...

Страница 5: ...ht Code Tube dia mm size 04 ø4 Air supply port tube dia Stand alone type inch size 06 ø6 08 ø8 5 32 ø5 32 1 4 ø1 4 5 16 ø5 16 5 32 code 5 32 and ø4mm code 04 is selectable for Nozzle Bore 0 5mm and 0 7mm only Straight 16 26 36 ø6 Manifold type VKM 00 Applicable to a manifold installation top mounting unit alone 18 28 38 ø8 10 20 30 ø10 12 22 32 ø12 48 58 68 ø8 40 50 60 ø10 42 52 62 ø12 Elbow Strai...

Страница 6: ...tions Code Tube dia S Silencer vent Exhaust port tube dia Stand alone type 08 ø8mm Straight type 8mm is same as 5 16 tube exhaust L8 ø8mm Elbow type 8mm is same as 5 16 tube exhaust Port type Rside only Both sides L side only Tube dia mm Silencer vent S1 S2 S3 Manifold type VKM 00 Applicable to a manifold installation top mounting unit alone Tube exhaust 18 28 38 ø8 10 20 30 ø10 12 22 32 ø12 13 23...

Страница 7: ...acuum generator Nozzle bore Complex vacuum generator Code Color W Light gray B Black Code Nozzle bore 05 0 5mm E type does not have Nozzle Bore 0 5mm 07 0 7mm 10 1 0mm 12 1 2mm Code H High vacuum type Rated supply pressure 72 5 psi 0 5MPa Code L Large flow type Rated supply pressure 72 5 psi 0 5MPa Code E High vacuum at low air supply pressure type Rated supply pressure 50 psi 0 35MPa Vacuum chara...

Страница 8: ...ation on the side front of a manifold Air supply port 00 Applicable to a manifold installation top mounting unit alone Exhaust port 00 Applicable to a manifold installation top mounting unit alone Solenoid valve type E Normally Closed N C type 24VDC for both suction and blow off Color W Light gray Example When vacuum port is installed on the upper plane of the station VK M H 12 R T1 4 00 00 E W NA...

Страница 9: ...n M Manifold type Vacuum port 00 When a vacuum port at any station differs in a manifolds Speciﬁcation Order Form is required separately Air supply port 48 R side only ø8mm Push In Fitting Elbow Exhaust port 62 L side only ø12mm Push In Fitting Elbow Color W Light gray Number of stations 08 8 stations Example of entry in speciﬁcation form when vacuum port differ even by one Manifold model code Con...

Страница 10: ... characteristics Nozzle bore Combinations Vacuum port Air supply port Exhaust port Solenoid valve Color Number of stations Vacuum switch with LED display Model code and number of units of manifold installation top mounting units 1 VK M H 07 G 00 00 00 E W 3 units 2 VK M E 10 W 00 00 00 G NW 1 unit 3 VK M H 12 R T6 00 00 E NA 3 units 4 VK M MB W 1 unit 1 See the speciﬁcation order form Examples 3 a...

Страница 11: ...ﬁcations as in the above example of speciﬁcation order form ﬁll up the St 1 space uppermost only while entering St 1 in each of the St 2 and St 3 grids on the Conﬁg port pos column For example if the manifold installation top mounting unit for St 6 happens to be the same model as that of St 1 enter St 1 in St 6 s grid on the Conﬁg port pos column On the right hand edge column are grids to enter th...

Страница 12: ...Exhaust port Solenoid valve Color Number of stations Vacuum switch with LED display For PISCO use only S t a t i o n Make a copy of this page and ﬁll in the code referring to model designation example Enter the quantity of common units in Number of stations Vacuum Generator VKSeries Specification Order Form To NIHON PISCO CO Ltd Name Order Date Requested EX W PISCO Date Quantity http www pisco com...

Страница 13: ...o freezing Model code VK H05 VK L05 VK H07 VK L07 VK E07 VK H10 VK L10 VK E10 VK H12 VK L12 VK E12 Nozzle bore mm 0 5 0 7 1 0 1 2 Supply pressure psi MPa 72 5 0 5 50 8 0 35 72 5 0 5 72 5 0 5 50 8 0 35 72 5 0 5 50 8 0 35 72 5 0 5 50 8 0 35 72 5 0 5 50 8 0 35 72 5 0 5 50 8 0 35 72 5 0 5 50 8 0 35 Final vacuum inHg kPa 26 9 91 21 5 73 19 8 67 27 4 93 21 5 73 19 8 67 26 8 91 27 4 93 21 5 73 19 8 67 26...

Страница 14: ...mer cylinder With suction solenoid valve only With combination of suction blow off solenoid valve DC24V Red Black AC100V Blue DC24V Black Suction solenoid valve Red Common White Blow off solenoid valve AC100V White Common Blue Suction solenoid valve Black Blow off solenoid valve Allowable vacuum leakage 1 3kPa 1 38inHg 10min or less Note In case of applying vacuum retention for long period take ab...

Страница 15: ...e P P 10 max IEC standard IP40 equiv 2 1 3 F S max at Ta 25 C Fixed 2 F S max NPN open collector output 30V 80mA max Residual voltage 0 8V max Variable about 0 15 of set value Output voltage 1 5V Zero point voltage 1 0 1V Span voltage 4 0 1V Output current Outputcurrent 1mAmax loadresistance50kΩmax LIN HYS 0 5 F S max approx 2m sec max 0 99kPa 2 digit red LED display About 4 times sec 3 F S 2 digi...

Страница 16: ... S max at Ta 25 C Fixed 2 F S max PNP open collector output Supply voltage 80mA max Residual Variable about 0 15 of set value Output voltage 1 5V Zero point voltage 1 0 1V Span voltage 4 0 1V Output current Outputcurrent 1mAmax loadresistance50kΩmax LIN HYS 0 5 F S max approx 2m sec max 0 99kPa 2 digit red LED display About 4 times sec 3 F S 2 digit 1 digit Red LED turns ON when pressure is above ...

Страница 17: ...hover valve Vacuum switch with LED Suction solenoid valve Ejector Blow oﬀ solenoid valve P P V EX V P P PR VKA circuit diagram Suction solenoid valve Ejector Silencer Vacuum switch with LED Filter Switchover valve Blow off air rate adjustment Blow off solenoid valve Example VKA W E Solenoid valve type Normally closed Blow off solenoid valve Filter Vacuum switch with LED Example VKA W E ...

Страница 18: ... timer cylinder P V EX P PR EX VKB circuit diagram Suction solenoid valve Ejector Filter Switchover valve Blow off air rate adjustment Blow off time adjustment Air timer cylinder Blow off solenoid valve Silencer Mechanical vacuum switch Example VKB Q E Solenoid valve type Normally closed Air timer type blow off valve Filter Mechanical vacuum switch Example VKB Q E http www pisco com ...

Страница 19: ...e F i n a l v a c u u m L t y p e F i n a l v a c u u m E ty p e F in a l v a c u u m H type suction flow E type suction flow Air Consumption L type suction flow Air consumption Supply pressure 0 5MPa H Ltype Characteristics Supply pressure Final vacuum Suction Flow Air Consumption 1 In the characteristics shown above supply pressures refer to those when vacuum is generated 2 In the characteristic...

Страница 20: ...onnect tubes Tube insertion Insert a tube into Push In Fitting of the vacuum generator VK up to the tube end Lock claws bite the tube to fix it and the elastic sleeve seals around the tube Refer to 2 Instructions for Tube Insertion under Common Safety Instructions for Fittings Tube disconnection The tube is disconnected by pushing release ring to release Lock claws Make sure to stop air supply bef...

Страница 21: ...culated by the following calculation formula Stand alone Manifold combination x No of stations Vacuum port cartridge x qty Supply port cartridge x qty Exhaust port cartridge x qty Manifold type Example1 VKA H 10 W 06 08 S E W NA 153 3 5 10 2 168 5g Stand alone weight VKA Combination W 153g Vacuum port cartridge CJC09 06 3 5g Supply port cartridge CJC09 08 10g Exhaust port cartridge Silencer for st...

Страница 22: ...m Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm 8mm 5 32in 1 4in 5 16in C Type VKB Type Vacuum port Air supply port 4mm VKA 4mm 6mm 8mm 5 32in 1 4in 5 16in Unit combinations Built in filter Check valve and Mechanical vacuum switch Exhaust port 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm 8mm 5 32in 1 4in 5 16in D Ty...

Страница 23: ...mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm 8mm 5 32in 1 4in 5 16in H Type VKB Type Vacuum port Air supply port 4mm VKA 4mm 6mm 8mm 5 32in 1 4in 5 16in Unit combinations Built in filter Suction solenoid valve and Mechanical vacuum switch Exhaust port 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm...

Страница 24: ...gital vacuum switch with LED display Exhaust port 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm 8mm 5 32in 1 4in 5 16in M Type VKB Type Vacuum port Air supply port 4mm VKA 4mm 6mm 8mm 5 32in 1 4in 5 16in Unit combinations Built in filter Suction solenoid valve and Air timer type blow off valve Exhaust port 8mm Withsilencer 8mm Withsilence...

Страница 25: ... Exhaust port 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 8mm Withsilencer 6mm 8mm 5 32in 1 4in 5 16in S Type VKB Type Vacuum port Air supply port 4mm VKA 4mm 6mm 8mm 5 32in 1 4in 5 16in Unit combinations Built in filter Suction solenoid valve Mechanical vacuum switch and Blow off solenoid valve Exhaust port 8mm Withsilencer 8mm Withsilencer 8mm Withsilence...

Страница 26: ...Vacuum Generator Series ...

Страница 27: ... D type Vacuum generator Filter Check valve Mechanical vacuum switch Mechanical type Mechanical type Vacuum release air needs to be supplied from outside when separating a work A B Type C D Type VKA Side port surface for manifold typeof manifold 112 5 Operation indicator lamp LED display 10 64 5 500 39 5 50 5 66 36 2 ø3 2 3 5 29 5 16 23 8 41 5 3 8 Vacuum switch with LED display EXH V P Mounting un...

Страница 28: ...44 36 16 18 36 3 8 3 5 106 11 500 Black N O Red N C White Com 29 5 52 8 EXH V P Manual button Side port surface for manifold type Mounting unit for manifold Unit connecting thread thread part to fix manifold Mechanical type Mechanical type S S VKA J E or F Combination code J type Vacuum generator N C Suction solenoid valve Filter and Mechanical vacuum switch VKA J G or H Combination code J type Va...

Страница 29: ...ination code M type vacuum generator N O Suction solenoid valve Filter Check valve and Vacuum switch with LED display Digital type Vacuum release air needs to be supplied from outside when separating a work S Digital type Vacuum release air needs to be supplied from outside when separating a work S VKA LED 44 36 2 ø3 2 106 10 58 33 9 5 500 16 3 8 54 18 18 9 47 5 3 5 4 7 5 9 Blow off time adjustmen...

Страница 30: ... valve Blow off suction valve and Filter VKA LED 44 36 2 ø3 2 106 11 500 10 58 9 5 500 16 3 8 54 18 18 9 3 5 5 9 4 7 47 5 52 8 EXH V P Blow off timer needle Black N O Red N C White Com Manual button Unit connecting thread thread part to fix manifold Mounting unit for manifold Side port surface for manifold type Mechanical type Mechanical type S S VKA Q E or F Combination code Q type Vacuum generat...

Страница 31: ... Suction solenoid valve Air timer type blow off valve Filter and Vacuum switch with LED display VKA LED LED 44 36 2 ø3 2 106 10 58 11 500 9 5 500 16 3 8 54 18 18 9 47 5 3 5 5 9 52 8 EXH V P Black N O Red N C White Com Manual button Manual button Unit connecting thread thread part to fix manifold Side port surface for manifold type Mounting unit for manifold Mechanical type Mechanical type S R S R ...

Страница 32: ...de W type Vacuum generator N C Suction solenoid valve Blow off suction valve Filter and vacuum switch with LED display VKA W G or H Combination code W type Vacuum generator N O Suction solenoid valve Blow off suction valve Filter and Vacuum switch with LED display W Type Dimension of Fitting Part øD2 ø8 øD1 Supply Port Fitting Vacuum Port Fitting Exhaust Port Fitting C2 L2 C1 L1 13 3 18 4 EXH V P ...

Страница 33: ...code D type Vacuum generator Filter Check valve Mechanical vacuum switch Mechanical type Mechanical type Vacuum release air needs to be supplied from outside when separating a work A B Type C D Type VKB 112 5 Operation indicator LED LED display 10 64 5 500 66 39 5 50 5 19 17 2 ø3 2 3 5 29 5 16 23 8 41 5 3 8 58 5 8 EXH V P Unit connecting thread thread part to fix manifold Side port surface for man...

Страница 34: ...7 16 18 36 3 8 58 10 2 ø3 2 3 5 106 11 500 29 5 52 EXH V P 8 Manual button Black N O Red N C White Com Unit connecting thread thread part to fix manifold Mounting unit for manifold Side port surface for manifold type Mechanical type Mechanical type S S VKB J E or F Combination code J type Vacuum generator N C Suction solenoid valve Filter and Mechanical vacuum switch VKB J G or H Combination code ...

Страница 35: ...Combination code M type Vacuum generator N O Suction solenoid valve Filter Check valve and Vacuum switch with LED display Digital type Vacuum release air needs to be supplied from outside when separating a work S Digital type Vacuum release air needs to be supplied from outside when separating a work S VKB LED 44 19 17 9 5 500 16 2 ø3 2 106 10 58 33 3 8 54 18 18 9 47 5 3 5 4 7 5 9 52 EXH V P 8 Man...

Страница 36: ...lve Blow off suction valve and Filter VKB LED 44 19 17 9 5 500 16 2 ø3 2 106 11 500 10 58 3 8 54 18 18 9 3 5 5 9 4 7 47 5 52 EXH V P 8 Manual button Blow off time adjustment needle Black N O Red N C White Com Unit connecting thread thread part to fix manifold Side port surface for manifold type Mounting unit for manifold Mechanical type Mechanical type S S VKB Q E or F Combination code Q type Vacu...

Страница 37: ...ction solenoid valve Air timer type blow off valve Filter and Vacuum switch with LED display VKB LED LED 44 19 17 2 ø3 2 106 10 58 11 500 9 5500 16 3 8 54 18 18 9 47 5 3 5 5 9 52 EXH V P 8 Manual button Manual button Black N O Red N C White Com Unit connecting thread thread part to fix manifold Mounting unit for manifold Side port surface for manifold type Mechanical type Mechanical type S R S R V...

Страница 38: ...de W type Vacuum generator N C Suction solenoid valve Blow off suction valve Filter and Vacuum switch with LED display VKB W G or H Combination code W type Vacuum generator N O Suction solenoid valve Blow off suction valve Filter and Vacuum switch with LED display W Type Dimension of Fitting Part L1 C1 L2 13 3 18 4 ø8 øD2 øD1 Exhaust Port Fitting Vacuum Port Fitting Supply Port Fitting EXH V P C2 ...

Страница 39: ...ith mounting units 1 8 14 27 6 16 16 12 12 16 2n 16 16 2n 32 n Number of stations 16 1 P 16 2 16 1 3 4 5 4 5 3 9 5 58 9 5 68 14 30 14 3 19 Upper unit thread part 4 M4 fitting hole Station St 1 St 2 St n R side L side EXH EXH V P P 8 Manifold type Tube exhaust Dimension of Supply Port Fitting Part Tube O D øD 11 6 1 4 12 8 5 16 14 10 3 8 L 17 18 19 12 1 2 23 5 20 C Unit mm Tube O D øD 14 5 8 5 16 1...

Страница 40: ...tting and a silencer element are detachable for maintenance by pulling a lock pin Make sure that the pin is properly inserted after the maintenance 2 The coil in a pilot solenoid valve generates heat under the following to conditions The heat may cause dropping life cycle malfunctions getting burnt or damaging peripheral machines Contact us when the power is applied to the vacuum generator under t...

Страница 41: ...only 2 When there is a drop of the vacuum performance due to insufficient volume of exhaust port or is an exhaust air leaking out through the vacuum port Consult us for the solutions There is a limit of station numbers to maintain the manifold performance by a nozzle size or a vacuum performance of each mounting unit Reason Silencer vent A drop of the vacuum performance due to a large exhaust resi...

Страница 42: ...s to be set for the lowering of pressure 3 Wire Connecting Method Do not use the vacuum switch in the environment or gasses containing corrosive substance It may cause a sensor trouble Wiring or ways by which noise or other disturbance is caused may cause a sensor trouble Since the sensors are not explosive proof do not use them in an inflammable or explosive gas fluid or atmosphere Since the sens...

Страница 43: ...to be long unavoidably place a sensor unit close to the vacuum end such as a vacuum pad Blow off air Blow off solenoid valve Air timer type blow off valve Turn the blow off air rate adjustment needle to the right clockwise to reduce blow off air and to the left counterclockwise to increase When finishing adjusting an air rate make sure to tighten the locknut in order to avoid deviation from the se...

Страница 44: ... silencer elements Model Code VKM SET How to mount the silencer element Use a screwdriver to tighten the four tapping screws with 0 3 0 4Nm of the tightening torque after the replacement Silencer element of manifold type consists of VKM SE1 2pcs and VKM SE2 1pce How to attach detach the nozzle and diffuser Pull out the diffuser with a pair of long nose pliers after remove the cover and the diffuse...

Страница 45: ...PISCO products and constitute all systems based on the latest catalog or information considering any malfunctions 2 Handle the pneumatic equipment with enough knowledge and experience Improper use of compressed air is dangerous Assembly operation and maintenance of machines using pneumatic equipment should be conducted by a person with enough knowledge and experience 3 Do not operate machine equip...

Страница 46: ...accidental damages of PISCO products due to incorrect usage 3 PISCO does not take any responsibility for any loss caused by improper usage of PISCO products such as exceeding the specification limit or not following the usage the published instructions and catalog allow 4 PISCO does not take any responsibility for any loss caused by remodeling of PISCO products or by combinational use with non PIS...

Страница 47: ...uit Rotary Block only The other PISCO products can be damaged in these applications 8 Use only Die Temperature Control Fitting Series Tube Fitting Stainless SUS316 Series Tube Fitting Stainless SUS316 Compression Fitting Series or Tube Fitting Brass Series under the condition of over 60 140 F water or thermal oil Other PISCO products can be damaged by heat and hydrolysis under the condition above ...

Страница 48: ...ch size Nylon tube Polyurethane tube ø1 8mm 0 05mm ø1 8 0 1mm 0 15mm ø3mm 0 15mm ø5 32 0 1mm 0 15mm ø4mm 0 1mm 0 15mm ø3 16 0 1mm 0 15mm ø6mm 0 1mm 0 15mm ø1 4 0 1mm 0 15mm ø8mm 0 1mm 0 15mm ø5 16 0 1mm 0 15mm ø10mm 0 1mm 0 15mm ø3 8 0 1mm 0 15mm ø12mm 0 1mm 0 15mm ø1 2 0 1mm 0 15mm ø16mm 0 1mm 0 15mm ø5 8 0 1mm 0 15mm 6 Instructions for Tube Insertion Make sure that the cut end surface of the tub...

Страница 49: ...thread or a fluid leakage Adjust the tube direction while tightening thread within these limits since some PISCO products are not rotatable after the installation Table 2 Recommended tightening torque Sealock color Gasket materials Thread type Thread size Tightening torque Sealock color Gasket materials Metric thread M3 0 5 0 7N m SUS304 NBR M5 0 8 1 0 1 5N m M6 1 2 2 7N m M3 0 5 0 5 0 6N m POM M5...

Страница 50: ...s 7 Provide a protective cover on the products when it is exposed to sunlight 8 Carry out clogging check for silencer element in an ejector and a vacuum filter periodically Clogged element will be a cause to impair the performance or a cause of troubles 9 Before replacing the element thoroughly read and understand the method of filter replacement in the catalog 10 Make sure the correct port of the...

Страница 51: ...an ejector with vacuum switch at the end of vacuum system as much as possible A long distance between a vacuum switch and a vacuum system end may increase plumbing resistance which may lead to a high vacuum level at the sensor even when no suctioning and a malfunction of vacuum switch Make sure to evaluate the products in an actual system 5 Refer to 4 Instructions for Installing a fitting and 5 In...

Страница 52: ...eroxide Vacuum Generator Series Vacuum Generator 9 The material of plastic filter cover for VQ and VFU series is PA Avoid the adherence of chemicals below to the products and do not use them under those chemical environments Table Chemical Name There are more chemicals which should be avoided Contact us for the use under chemical circumstance ...

Страница 53: ...erformance or having an effect to other vacuum ports can be caused depending on number of stations or a combination of mounting units Contact us for any unclear points 3 Compressed air contains many kinds of drains such as water oxidized oil tar and other foreign substances Dehumidify the compressed air by using an after cooler or a dryer and improve the air quality since those drains seriously im...

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