VACUVENT 025VA25, Owner'S Manual

Page: 12 / 18

Independent Valve Marketing (Pty) Ltd
Engineering Page 12 of 18
VSS0203WD00
INSTALLATION, REMOVAL AND STORAGE INSTRUCTIONS
POSITIONING
Air valves should be positioned in very specific areas in order to function optimally. It is suggested
that Vacuvent air valves be placed on top of an air accumulator, shown below.
This accumulator should be a tee to the main pipeline; a reduction can then be added to which the
air valve is mounted. Minimum recommended dimensions are given in the drawing. The
accumulator facilitates the effective introduction of air into a draining pipeline. If an accumulator is
not used the incoming air may be swept away before effectively vented.
Figure 4- Air Valve Arrangement
It is good practice to add an isolator valve underneath the air valve, as shown in the image above,
to facilitate the removal of the air valve for maintenance or repair without disrupting the pipeline.
Air Valve isolating valves usually are either screwed or flanged ball valves (dependent on air valve
end connection ordered) on 1 “ to 2” Air Valves, Flanged Resilient Seal Gate Valves for 3” to 8” Air
Valves for design pressures up to 363 Psi and Flanged Wedge Gate Valves or Flanged Ball valves