APTech AP72 - Manual

687 Technology Way
Napa, CA 94558
Phone: (707) 259-0102
FAX: (707) 259-0117
www.aptech-online.com
Operation Manual
Vacuum Generators
(Models AP7, AP70, AP71, and AP72)
A. General information
The AP7, AP70, AP71, and AP72 are venturi type vacuum generators used in gas delivery
systems to assist in purging of piping systems. The AP71 and AP72 models also contain a check
valve and an operator controlled shut-off valve integrated into the vacuum generator body. The
shut-off valve is used to shut off supply nitrogen to the vacuum venturi. The check valve
prevents backflow into the nitrogen supply. The AP71 models contain a pneumatically actuated
shut-off valve. The AP72 series of models contain either a pneumatically actuated shut-off valve
(AP72540 and AP72550 models) or a manually actuated shut-off valve (AP72600, AP72625,
and AP72650 models). Many configurations are available with different operating characteristics
and porting. Refer to the appropriate catalog data sheet for specific product information.
B. System Design / Product Selection
1. When selecting the vacuum generator model and configuration, verify that the operating
characteristics of the vacuum generator as described below are appropriate for the system in
which it will be installed.
a. Verify the materials of construction are compatible with the intended process gas.
b. Verify the pressure and temperature ratings are acceptable for the intended application.
c. Verify that the vent system is appropriately sized to prevent back-pressure from affecting
the vacuum level.
d. Verify that the nitrogen source meets the pressure and flow requirements.
e. For the AP71 and pneumatically actuated AP72 models, verify that the actuation pressure
is within the required pressure range.
C. Installation
1. Inspect the vacuum generator to determine the location of the inlet, outlet, and vacuum ports
and how the device will need to be installed in the system.
a. The vacuum generator inlet and outlet ports are either marked “IN” and “OUT” on the
body, or an arrow (located on the body or model number label) will point from the inlet
port to the outlet port.
b. The vacuum port runs perpendicular to the inlet and outlet ports, which are inline with
each other. The vacuum port may be marked “VAC”.
c. Refer to the catalog data sheet for additional help in identifying the ports.
2. Inspect the system to determine the connections to the vacuum generator.
a. Identify the nitrogen source line to be connected to the vacuum generator inlet port.
b. Identify the vent system line to be connected to the vacuum generator outlet port.
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