1. Vacuum Unit ZK2 Series
The ZK2 series is a product compatible with both of the vacuum ejector and vacuum pump system.

2. 1. Features (1)
- Improved energy saving Mounting of the digital switch for vacuum with an energy saving function reduces air consumption by 90% minimum.
Energy saving ejector
Existing model
Air supply
Air supply
Exhaust
Exhaust
When the vacuum pressure reaches the set value for suction, the digital vacuum switch with an energy saving function (hereinafter referred to as “the energy saving switch”) turns off the supply valve and the check valve keeps the vacuum. Then, when the vacuum pressure lowers to the set pressure for non-suction, the energy saving switch turns on the supply valves again, and keeps the vacuum to a certain level.
This operation process realizes large reduction of air consumption from the existing model that continues to consume air during suction.
Exhaust
Vacuum
Vacuum
Air is consumed and exhausted intermittently only when the vacuum pressure lowers.
Air is consumed and exhausted continually during suction of work piece.
Work piece
Work piece

3. 1. Features (2)
- Improved energy saving The renovated two-stage ejector reduces air consumption and increases suction flow rate, which improves evacuation efficiency (ratio of suction/consumption).
Vacuum digital switch with energy saving function
Pilot valve (for vacuum break)
Pilot valve (for supply)
Suction flow rate
increased
Dual 2 port valve
Air consumption
reduced
1st nozzle 2nd nozzle
The existing model integrated the 1st and 2nd stage diffusers, which restricted a flow path design. On the other hand, the ZK2 series has the nozzle, 1st stage diffuser and 2nd stage diffuser separately, and allows a design improving performance of each component.
Suction flow rate
Check valve

4. 1. Features (3)
- Supply valve with self-holding function The supply valve turns on with instantaneous energizing, and holds evacuation to prevent a work piece from dropping and helps lower power consumption.
Vacuum digital switch with energy saving function
Pilot valve (for vacuum break)
Pilot valve (for supply)
Dual 2 port valve
- Interlink between supply valve and break valve The supply valve interlinks with the vacuum break valve, and turns off when the vacuum break valve turns on. The OFF signal, which was required for existing self-holding products, is unnecessary.
The dual 2 port valve is equipped with a self-holding function for the supply valve.
However, the self-holding function is not available when the energy saving switch with an energy saving function is selected because the supply valve needs to be a N.C. type and turned on and off electrically to control energy saving.
The self-holding function can keep evacuation without power supply once the supply valve is turned on (by energizing for at least 20ms). (Compressed air supply is necessary.), and turns on and off the supply valve by turning on the vacuum break valve different from the OFF signal of existing self-holding products such as a double solenoid and latching type product.
Check valve
Pilot valve power consumption: 0.35W

5. 1. Features (4)
- All-in-one design The components for the vacuum ejector are integrated to be compact.
- Compact and light weight Compared with the existing model: Weight: -58% (Single unit: 81g) Volume: -22%
Vacuum pressure switch
Valve assembly
One-touch fitting
Vacuum break flow adjusting needle
The ZK2 series is more compact and more light and improved in performance than the existing model.
The weight is compared by a single unit with the supply valve and vacuum break valve, and by a silencer exhaust type product.
The ZK2 series is also improved in the following points.
Maintenance is easier. The suction filter is accessed easily by rotating the vacuum port 90 degree.
Mounting variations are versatile. Side mounting, bracket mounting (option) and DIN rail mounting (option) are available.
Manifold wiring specifications are also versatile. Individual wiring, flat-ribbon cable (26 poles) and D-sub connector (25 poles) are available.
Supply
Vacuum
Existing model: 195g
Silencer
Suction filter

6. 2. Background of Development
(1) To respond to market requests and improve customer satisfaction.
　- Reduced air consumption, reduced wiring, compact and light weight, etc.
(2) To reinforce market competitiveness.
　- Totally improved competitiveness including improved evacuation performance and energy saving.
(3)To remodel the most versatile model among vacuum ejector series, and expand share in wide variations of industries.
　- Equipped with the performance, functions and ease of use to consolidate the ZM, ZX and ZY.
　- Wide variations that can be promoted to both customers of ejectors and vacuum pumps.
The ZK2 series aims at switchover from the ZA to the ZB and from the ZX, ZM and ZY to the ZK2.

7. 3. Applications Packaging Transfer Unpacking Panel conveyer
A wider range of work piece products can be covered.
However, you should note that the work piece with vacuum leakage is not applicable to the energy saving switch, which may fail to keep vacuum.
Unpacking
Panel conveyer
Applicable to general environments of EP, CP, MP, FP and MDP industries.　　　　　　　　　　　　　　　　

8. 4. Specifications and Performance
Item
ZK2 ZX ZM
Nozzle diameter 07 10 12 15 05 H 13 M S
Standard supply pressure
0.35
0.4
0.45
0.5
Suction flow rate 29 44 61 67 5 22 30 50 66 23 38 37 45
Consumed flow rate 24 40 58 90 46 17 60 33 85 88
110
Vacuum pressure
-91kPa
-84kPa
　-84kPa
(A)
(B)
(C)
It is apparent that performances are different from the one-stage ejector.
Even in comparison with the two-stage ejector, ZM, suction flow rate is increased and air consumption is reduced.
Additionally, the table shows a silencer exhaust type product, and values are improved more for a port exhaust type product (without pressure exhaust).
Please check catalog for details.
Air consumption -27%, Suction flow rate +26%
Air consumption -33%, Suction flow rate +16%
(A): MPa
(B): L/min(ANR)
(C): L/min(ANR)
Air consumption -31%, Suction flow rate +39%
Air consumption -18%, Suction flow rate +49%
The ZK2 is an energy saving product with improved suction flow rate to air consumption.

9. Vacuum break pilot valve
5. Construction (1) Vacuum Ejector　　　　　　　　　　　　　　　　　　　　　　　　　　　　
Valve assembly
Vacuum break pilot valve
Vacuum break valve
Vacuum digital pressure switch
Digital pressure switch with energy saving function
Supply pilot valve
Supply valve
Vacuum break flow rate adjusting needle
Compressed air supply port (PV)
The pilot valve used is S070, whose air consumption is no more than 0.35W.
The figure shows a product with N.C. type supply and vacuum pressure valves, which is available the energy saving switch. (Between the supply valve and vacuum break valve has a spring.)
And, in case of a product with a self-holding function, the supply valve is held on (at the right of the figure), and pushed to the left of the figure and turned off when the vacuum break pressure is turned on. (There is no spring.)
Exhaust (side surface)
Vacuum port (V)
2-stage ejector
Check valve
Filter element
Sound absorbing material

10. Vacuum break pilot valve
5. Construction (2) Vacuum Pump System
Valve assembly
Vacuum break pilot valve
Vacuum break valve
Supply pilot valve
Supply valve
Pilot pressure exhaust port (PE)
Vacuum break flow rate adjusting needle
Vacuum pressure supply port (PV)
Pressure sensor assembly
Major differences in appearance between the pump system and ejector system are:
The pump system has a spacer below the valve assembly, which extends the full height by 5mm from the ejector system.
And, the pump system has a PS port.
Besides them, they use different parts, and cannot be exchanged each other.
Pilot pressure supply port (PS)
Vacuum port (V)
Vacuum pump adapter
Filter element

11. 7. How to Order (1) Single Unit
Vacuum pump system
Ejector system (with valve)
Ejector system (without valve)
Remains blank when no option is selected.
(1) System and body type
(3) Supply / Vacuum break valve
(5) Pressure sensor / Vacuum pressure switch
Symbol
Supply
Vacuum break K
N.C. J
None R
Self-holding N
Symbol
System
Body
Exhaust P
Pump system
Single ― Q
Manifold A
Ejector
Silencer B
Port C
Common F
Individual port
Symbol
Type
Pressure range (kPa)
Exhaust P
Pressure sensor
0~-100 ― T
-100~100 A
Vacuum digital pressure switch
0~101
NPN
2 outputs
Unit conversion B
SI unit only C
PNP D E F H J K
Energy saving switch
100~-100
1 output Q R S N
None
Please check catalog for details of item 6 to 8.
(2) Nozzle nominal diameter
(4) Rated voltage
Symbol
System
Dia. 00
Pump system ― 07
Ejector
f0.7 10
f1.0 12
f1.2 15
f1.5
Symbol
Voltage 5
DC24V 6
DC12V
Not applicable
(6): Connector for (3) and (5)
(7): Vacuum port size
(8): Option

12. 7. How to Order (2) Manifold
(1) No. of station
(4) Wiring specification
Symbol
No. of stations 01 1 02 2 … 10
Symbol
Spec. L
Individual wiring F
D-sub connector P
Flat-ribbon cable N
No wiring
(2) System (combination of ports)
(5) Option
Symbol
Port standard
System
Port P mm
Pump system
Common PV, Common PS A
Ejector
Common PV PN
Inch
Common PV, Common PS AN
Symbol
Option B
DIN rail mounting D
Common vacuum pressure supply port (PD) L
Individual supply
Item 6 is to select whether or not the manifold and its parts are assembled for shipment.
Normally, the ejectors and manifolds are assembled for shipment, but you can choose not to assemble the manifold and its parts for the purpose of stock or replacement.
(6) Assembly on manifold
(3) Exhaust type
Symbol
Type
NIL
Assembled with units A
Not assembled with units, Shipped as a part
Symbol
Type 2
Pump system
Without silencer 1
Ejector
Common silencer exhaust

13. 8. Dimensions Symbol N mm 06 f6 9.7 Inch 07 f1/4" 12.3 Symbol P Q mm
Manual override (for supply valve)
Manual override (for vacuum break valve)
Symbol N mm 06 f6
9.7
Inch 07
f1/4"
12.3
Symbol P Q mm 06 f6
8.25 4 08 f8
11.4 6
Inch 07
f1/4"
10.8
4.76 09
f5/16"
Supply port (PV)
Vacuum break needle
Please check catalog for details of dimensions including the manifold dimensions.
With across flat
Vacuum port (V)
Symbol A B C D E F G H J K L M
Dimension
79.8
104 79 75
38.5
16.5
19.4
27.5 15
45.9
8.4
2xf4.5

14. Ejector with energy saving switch Ejector with energy saving switch
The digital pressure switch with energy saving function significantly reduces air consumption.
Operation principle
The switch keeps the vacuum pressure built up by the ejector, and stops evacuation when the set vacuum pressure is achieved, and resumes evacuation automatically when the vacuum pressure lowers.
The existing ejector continues to consume air during suction.
(ejector air consumption)
Cumulative flow rate
Ejector with energy saving switch
The air supply is stopped during suction.
Signal to supply valve
Existing
Energy saving
Operation
Supply valve
Vacuum build-up
Suction confirmation and pressure (P1) achieved
Atm. pressure
You need to read the Operation Manual available on website to ensure understanding of product construction and characteristics, and proper using.
The ZK2 series turns off the supply valve and stops evacuation by the energy saving switch when the vacuum pressure reaches the set value for suction while the existing model continues evacuation even after the vacuum pressure reaches the set value for suction, and keeps consuming air.
When the vacuum pressure lowers for some reasons, the energy saving switch detects the pressure and automatically resume evacuation.
Keeping evacuation
Vacuum pressure (P3) lowering
Existing ejector
Ejector with energy saving switch
Suction confirmation and pressure (P1) re-achieved
Vacuum port pressure
Keeping evacuation
Suction and transfer complete and work piece released
Suction complete and pressure (P2) achieved
Ultimate vacuum pressure

15. 9. Energy Saving Switch (2)
Settings
Adjustment of the following parameters may be required for proper operation of the energy saving function. (If the default values are suitable for application, the adjustment is unnecessary.)
Please control on and off of the vacuum break valve with external equipment.
Adjustment parameters
P_1: Vacuum pressure for suction confirmation (switch output ON)
--- Default value: -70kPa
H_1: Pressure variation when suction completes (switch output OFF)
--- Default value: 10kPa
H_2: Pressure drop variation when the supply valve is turned on
--- Default value: 5kPa
The ZK2 series starts evacuation and suction when the input signal for suction is entered, and repeats stop and restart of evacuation to the set pressure for suction until the input signal stops. Parameter adjustments may be necessary for proper operation of the energy saving switch.
In the default setting, the supply valve is turned off when the vacuum pressure reaches the P_1. If you want to delay this off timing to increase the vacuum pressure even after the energy saving switch outputs, please change the H_3 (supply valve off point) from a 0kPa of default setting. For details, please read the Operation Manual of the energy saving switch available on website.
If the work piece has too large vacuum leakage to keep evacuation, the energy saving switch may fail to work, and the supply valve is turned on and off too frequently, which shortens the life of the valve. In this case, please set the H_3 to a high value that cannot be achieved by the ejector. The supply valve can be held on.

16. 10. Precautions for Handling
Energy saving switch
1. Use under operating conditions with small vacuum leakage.
2. Sufficiently evaluate the pump before use.
3. The energy saving switch cannot be used in the vacuum pump system.
4. The combination of the actuation types of the supply valve and vacuum break valve is N.C./N.C. only.
Energize the self-holding type supply valve for 20ms at least.
When using the pump system, set the PS and PD pressures to 0.3MPa or less.
The filter case is made of resin. Do not apply excessive load to the piping of the vacuum piping port (V).
In case the energy saving switch is used for the work piece with large vacuum leakage, the supply valve is turned on and off too frequently, which causes chattering. Please use the switch under operating conditions with small vacuum leakage.
When using the energy saving switch, please conduct sufficient evaluation. The evaluation should be conducted with the equipment using the product considering safety, and to ensure proper energy saving operation.
The vacuum pump system is not available with the energy saving switch. When the vacuum pump is held evacuated, the energy saving switch may fail to start evacuation for vacuum leakage by turning on the supply valve. Also, energy saving by turning off the supply valve is meaningless when the vacuum pump is always in operation.
The energy saving switch can work only when both of the supply valve and vacuum break valve are a N.C. type.
The self-holding type product should be energized for at least 20ms. Shorter energizing may cause improper evacuation.
When using a suction nozzle for suction in the vacuum pump system, please set the PS and PD pressures (option) to a closer value of the minimum operating pressure of the valve, which prevents excessive increase of the internal pressure of the vacuum piping when the vacuum is broken.
The filter case and vacuum port (V) are resin. Please do not apply excessive load to them and their piping.