Watts 9BD User Manual
For Non-Health Hazard Applications
ES-9BD
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Model 9BD
Backflow Preventer for Vend ing
Machine Water Supply Lines
Sizes: 1⁄4" and 3⁄8" (6 and 10mm)
Model 9BD backflow preventer for vending machine water supply lines prevents backflow of carbon dioxide gas and car bonat ed water into the water supply system to vend ing ma chines,
thus elim i nat ing the hazardous re ac tion of car bon di ox ide with
cop per tub ing.
Its design features include a dual check valve to as sure pos itive, dependable seating protection. For trouble-free longevity, it
is also equipped with a ball check valve which is a third-check
mem ber, its main func tion being to pre vent backpressure on
each pump cycle from unnecessarily acting di rect ly on the
check members. In stant check valve re sponse pre vents un neces sary vent dis charge dur ing pump "off cycle".
Vent discharges C02 gas to atmosphere in the event of foul ing
or mal func tion of check No. 2 thereby safe guard ing the po ta ble
water sys tem from CO2 gas con tam i na tion. In line design mini miz es pres sure drop across the valve thereby assuring max imum pump per for mance.
Contractor
Approval
Contractor’s P.O. No.
Representative
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Typical Installation
9BD Backflow Preventer
Water
Supply
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9BD
Features
• Available in Flare or NPTM end connections
• Stainless steel body and parts
• Instant check valve response
• Minimum pressure drop
• Triple check protection of the water supply
Valve
Filter
Backpressure 60-120psi
Pressure - Temperature
Temperature Range: 33ºF-140ºF (0.5ºC-60ºC)
Maximum Working Pressure; 150psi (10.34 bar)
All stain less steel body and heavy duty rubber parts as sure the
long est and most dependable operating life. All rubber compounds com ply with FDA food additive reg u la tions.
Standards
Designed to meet the requirements of New York City Health
Code Sec tion 81.47.
NSF Standard No. 25, Revised Items 4.35.2 and 4.35.3.
*The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (0.25%) of
lead by weight.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Approvals
Approved by independent testing, completing over 2,000,000
successful pump cycles with positive backflow protection and
trou ble-free performance.
All rubber compounds comply with FDA food additive reg u la-
tions.
Pump
100psi
Carbonator
H
2O and CO2
CO
Cooler
2 Gas
How it Operates
kPa psi
207 30
172 25
138 20
103 15
69 10
35 5
00
.5 11.5 2. 2.5 gpm
1.93.8 5.77.6 9.5 lpm
2
2
4
3
4
6
6
Static Pressure-No Flow
Primary disc (1) seats against
diaphragm (2) with diaphragm
(2) sealing off the atmospheric
1
port (3). Secondary disc (4) seals
against downstream seat (5). Ball
5
7
check (6) seals against ball check
seat (7). This is the normal posi-
tion taken by the device when
there is no demand on downstream equipment.
7
Valve Opened Flowing Under
Pressure
With flow through valve, primary
disc opens away from diaphragm
seal. Atmospheric port remains
closed by deflection of diaphragm
seal. Secondary disc opens
away from downstream seat.
Ball check opens away from ball
check seat permitting flow of
water through valve.
Capacity
Dimensions - Weights
B
Valve Closed by Back
Pressure in System
With a backpressure condition created, ball check seats
firmly against ball check seat.
Secondary disc seals tightly
against downstream seat.
Primary disc seals tightly against
diaphragm. Atmospheric port is
now open permitting air to enter
air break chamber. In the event
of fouling of downstream check
valve, leakage of CO
2 gas would
be vented to atmosphere through
the vent port thereby safeguarding the potable water system
from CO
2 gas contamination.
A
SIZE(DN) DIMENSIONS WEIGHT
A B
in. mm in. mm in. mm lbs. kgs.
1
⁄4 6 23⁄4 70 13⁄8 35 .38 .17
3
⁄8 10 23⁄4 70 13⁄8 35 .38 .17
This valve should only be used in areas
where spillage of water could not cause
damage. Install a vent discharge line to the
vent outlet of 9BD and vent to a safe place
of disposal with adequate ven ti la tion where
CO
2 discharge is not a hazard.
A Watts Water Technologies Company
ES-9BD 0940 © Watts 2009
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
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