Page 74 - Parker - Vacuum products

Catalog 0802-E Vacuum Generators
Generator Selection Technical Data

Principle of venturi vacuum 2. Design a system with all of the supporting components
A vacuum generator is a single stage venturi that creates high integrated into the venturi generator.
vacuum with fast response using compressed air.
Normally Closed
The ability to control this performance renders this technology Vacuum Pilot Valve
as an excellent solution for factory automation.
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
B low pressure area of the diffusion chamber and is exhausted Venturi
thru the diffuser. This effect increases the vacuum level and
evacuates most of the air within the closed vacuum system at
supersonic speeds.
Check
Valve
Blow-off Flow
Adjustment
Diffusion
Nozzle Chamber Diffuser Normally Closed
Blow-off Pilot Valve Filter
Selection
Generator
Inlet Exhaust
Pressure Cup Sensor
CV-CK
MCA, CV,
There are several advantages to an integrated venturi system.
The response time of the vacuum and blow-off functions
CHF
are greatly reduced compared to basic venturi generators,
Vacuum the installation time is also reduced which makes this a cost
Flow
effective system and the compact size allows the integrated
unit to be close to the suction cup.
MC22
Additional advantages to venturi generators
• No moving components Venturi generator with power loss circuits
MC72
• Low maintenance When designing a vacuum system that requires a Normally
• Long life Open circuit or Emergency Stop circuits to avoid any hazard
during a power failure, consider the circuits below and on the
• Responsive following page.
CEK
• Physically small
• Cost effective
Normally open circuit
CVXCEK
Applying the venturi generator
1. Design a system with basic venturi generators and Normally Closed
MPS-23
individual components to support the vacuum circuit. Vacuum Pilot Valve

MVS-201
Normally Open
Master Valve

Normally Closed Venturi
Normally Closed Master Valve
Generator
Accessories
Air Supply
Check
Valve
Venturi Blow-off Flow
Adjustment
Glossary
Normally Closed
Filter Blow-off Pilot Valve Filter

Cup Sensor Cup Sensor

B4 Parker Hannifin Corporation
Pneumatic Division
Richland, Michigan
www.parker.com/pneumatics