Submittal Sheet

Models
Suffix
C&T Cap and tether test cocks
PC Internal polymer coating
QT Quarter-turn ball valves
S Bronze strainer
HW Stainless steel check modules for hot and harsh
water conditions
LF Without shutoff valves
LH Locking ball valve handles (open position)
HC Inlet/outlet fire hydrant fitting (2" only)
Prefix
C Clean and check strainer -
3
⁄4" and 1"
(20 and 25mm) only
U Union -
3
⁄4" and 1" (20 and 25mm) only
FAE Flanged adapter ends - 1
1
⁄4", 1
1
⁄2", 2"
(32, 40, 50mm) only
NOTE: The installation of a drain line is recommended. When in-
stalling a drain line, an air gap is necessary.
Materials
Body: Bronze
Check Seats: 909 Celcon
®
Relief Valve Seats: Stainless steel 909HW
Test Cocks: Bronze
Celcon
®
is a registered trademark of Celanese, Limited
Connections
3
⁄4" – 1" (19 – 25mm) 909-NPT Female threaded body connection
1
1
⁄4" – 2" (32 – 50mm) 909-M1-NPT Male threaded
body connection
Standards
AWWA C-511-92
FCCCHR of USC Manual Section 10
IAPMO (UPC), SBCCI (Standard Plumbing code)
Approvals
Listed by IAPMO
Listed by SBCCI
*Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California.
Horizontal and vertical “flow-up” approval on
3
⁄4" (20mm) and
1" (25mm) sizes (models 909QT, 909PCQT, and U909QT).
Pressure — Temperature
Temperature Range: 33°F – 140°F (0.5°C – 60°C) continuos,
180°F (82°C) intermittent
Maximum Working Pressure: 175psi (12.1 bar)
Series 909HW:
Temperature Range: 33°F – 210°F (0.5°C – 99°C)
Maximum Working Pressure: 175psi (12.1 bar)
L
AS
B
ES
C
D
Model 909QT-S
E
L
A
P
Model 909QT
Dimensions — Weights
When installing a drain line use 909AG series Air Gaps on
Series 909 backflow preventers. *909EL series elbows are for
air gaps on backflow preventers in vertical installations.
How it Operates
The unique relief valve construction
incorporates two channels: one for air,
one for water. When the relief valve
opens, as in the accompanying air-
in/water-out diagram, the right-hand
channel admits air to the top of the
reduced pressure zone, relieving the
zone vacuum. The channel on the left
then drains the zone to atmosphere.
Therefore, if both check valves foul,
and simultaneous negative supply and
positive backpressure develop, the re-
lief valve uses the air-in/water-out
principle to stop potential backflow.
Patent# 4,241,752
Reduced
Pressure
Zone
WATER OUT
AIR IN
Series 909AG Air Gaps
909 DRAIN OUTLET DIMENSIONS WEIGHTS
Iron Body Sizes Sizes A B
No. Desc. in. mm in. mm in. mm in. mm lbs. kg.
909-AG-C Air Gap
3
⁄4,1 19,25 1 25 3
1
⁄4 83 4
7
⁄8 124 1
1
⁄2 .7
909-EL-C Elbow*
3
⁄4,1 19,25 – – 2
3
⁄8 60 2
3
⁄8 60
3
⁄8 .2
909-AG-F Air Gap 1
1
⁄4-2 32-50 2 50 4
3
⁄8 111 6
3
⁄4 171 3
1
⁄4 1.5
909-EL-F Elbow* 1
1
⁄4-2 32-50 – – 3
5
⁄8 92 3
5
⁄8 92 2 .9
A
B
A
B
1013 B64.4