Pressurization; Air Bypass Valve - ADC HiGain HRE-819 Manual

Overview

Pressurization

Figure 5 shows the pressurization valves. One of the most noticeable external differences between the two
enclosures is that the air bypass valve is absent from the gel-core model, HRE-819 List 1.

Air Bypass Valve

List 1 enclosures (gel-filled stub) are intended for above-ground applications and applications requiring the stub
to be spliced to non-pressurized, air core cables. Therefore, the List 1 enclosures do not have an air bypass valve.
List 2 enclosures (air-filled stub) are intended for man-hole applications. The List 2 enclosures are equipped with
an air bypass valve which is used to retain static pressure within the base and to control the inlet air supply that is
pumped from the main feeder cable through the 30-foot (9.144 M) stub into the HRE-819 enclosure.
•
To shut off the inlet air supply, turn the air bypass valve counter-clockwise one-quarter turn away from the
housing.
• To turn on the inlet air supply, turn the air bypass valve clockwise one-quarter turn towards the housing.
6
Figure 5. Pressurization Valve Locations
July 9, 1998
150-819-100-03
HRE-819 List 1 and 2