N E T A F I M T E C H L I N E
®
C V D E S I G N G U I D E
N E T A F I M T E C H L I N E
®
C V D E S I G N G U I D E
AIR/VACUUM RELIEF
VALVES:
Because Techline CV is designed
to keep water in the tubing, an
A/VRV would only be used in
conjunction with an automatic
Line Flushing Valve as described
in the previous section.
If you want to hold the water
inside the dripperline after
zone shutdown, (you are using
a TLSOV or FIG8 in lieu of an
automatic Line Flushing Valve)
disregard this section.
An Air/Vacuum Relief Valve
(A/
VRV)
freely allows air into a zone
after shutdown. It also ensures
a vacuum doesnʼt draw debris
into the dripperline. Further, they
also provide a means of releasing
air from the dripperline when the
zone is turned on, thus eliminating
air pockets and speeding up
dripperline operation. (Because
water stays in a Techline CV zone
anytime the elevation across the
zone is less than
4
1
/2
feet, this is
not an issue).
• On zones where an Air/Vacuum
Relief Valve is desired, they are
installed at the highest point(s) in
the zone.
• To ensure that all of the
rows of the dripperline can
take advantage of the Air/
Vacuum Relief Valve,
install
it/them along a lateral that
runs perpendicular to the
dripperline laterals. This may
be an exhaust header, or a
special lateral connecting all
the rows of dripperline, such as
going over a berm.
In large scale irrigation systems
where pumps and large diameter
pipe are used, air that has been
created must be expelled. As
such, the use of Continuous
Air Vents may be required
on continuously and non-
continuously pressurized lines.
Netafim Air/Vacuum
Relief Valve (TLAVRV)
Installing A/VRV
To Laterals
Techline Start
Connection
Line Flushing Valve Plumbed to PVC,
Poly or Techline CV
Area Perimeter
Techline CV Lateral Tubing
Blank Tubing
Centered on mound
or berm
Supply Header
Remote Control Valve
with Disc Filter and PRV
Exhaust
Header
Techline Tee
Air/Vacuum Relief Valve
(Plumbed to Techline CV,
one at each high point)
LF
AR
NOTE
6" Round Valve Box
Air/Vacuum Relief Valve
Techline 180 2-Way
Adapter Tee - TL075FTEE
3/4"M x 1/2"F
Reduction Bushing
Finish Grade
Techline CV Tubin
3/4" Crushed
Gravel Sump
Brick Supports (3)
BASIC
DESIGN
STEPS
(continued)
NOTE
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