2
VAC-SIF-05
Training & Maintenance Manual
CVX0260B
Parker Hannifin Corporation
Pneumatic Division
Richland, Michigan
www.parker.com/pneumatic
The below flow charts illustrates the basic operation of the
vacuum system.
Vacuum is created when the unit receives a command
vacuum “ON” (high signal is sent to Vacuum Pilot Valve (1)).
The vacuum sensor output will turn off the vacuum solenoid
and begin the Air Conservation Mode with the built-in check
valve at the switch point (n_1). The Check Valve (3) maintains
the vacuum level until the hysteresis switch point (n_2) of
Sensor (2) is reached to restore the original vacuum level or
the Blow-off Pilot Valve (4) is activated to decay the vacuum
pressure. The unit will release the part by command blow-
off “ON”. Command vacuum “ON” should be turned “OFF”
when command blow-off is turned “ON”. The Emergency Stop
operating system (5) is activated by an emergency event or
power failure.
General Description of CVX0260B
Vacuum Units
The CVX0260B vacuum generator creates vacuum and
blow-off pressure in a vacuum system and has additional air
economizing and emergency operating system functions.
A vacuum system consists the automation components
connected to the vacuum port of the vacuum generator.
Each CVX0260B unit consists of 2 independent vacuum
generators labeled channel 1 and channel 2. Each vacuum
generator has a vacuum solenoid pilot valve, blow-off
solenoid pilot valve, blow-off needle control valve, pressure
sensor, vacuum check valve, vacuum filter, and exhaust
filter. Each Vacuum Generator is mounted to a 2-Station
bar manifold with an optional electrical mounting kit. The
pressure provided to inlet port of the bar manifold is common
to both vacuum generators. Each CVX0260B Assembly has
an Emergency Operating System that controls both Vacuum
Generators.
General Operation of CVX0260B
Vacuum Units
A vacuum generator is a single stage Venturi that creates
vacuum pressure using compressed air. In principle,
compressed air is throttled as the air exits the nozzle and
is discharged into the diffuser. This increased velocity of air
lowers the pressure in the diffusion chamber. The volume
of air within the closed vacuum system flows into the low-
pressure area of the diffusion chamber and is exhausted
thru the diffuser. This effect increases the vacuum level
and evacuates most of the air within the closed vacuum.
The vacuum generator will produce the specified degrees
of vacuum as cataloged if the vacuum system is closed,
inlet pressure is to design pressure, and there are no major
restrictions in the exhaust flow.
Pressure
Sensor
Vacuum
Port
Vacuum
Filter
Exhaust
Filter
Vacuum Pilot
Valve
Blow-off Pilot
Valve
Blow-off
Needle
Control
Valve
Bar Manifold
Emergency
Operating
System
1
2
Nozzle
Diffuser
Diffusion
Chamber
Inlet
Pressure
Vacuum
Flow
Exhaust
PFG Cup
Sensor
Venturi
N.C. Master
Valve
N.C. Master
Valve
Filter
Flow
Control
Vacuum
Pilot
Valve
1
Emergency Stop System
5
Blow-off
Pilot
Valve
4
Check
Valve
3
2
Description & Operation
