How it operates, Capacity, Dimensions - weights – Watts 9BD User Manual
Page 2
How it Operates
Static Pressure-No Flow
Primary disc (1) seats against
diaphragm (2) with diaphragm
(2) sealing off the atmospheric
port (3). Secondary disc (4) seals
against downstream seat (5). Ball
check (6) seals against ball check
seat (7). This is the normal posi
tion taken by the device when
there is no demand on down
stream equipment.
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.
Valve Closed by Back
Pressure in System
With a backpressure condi
tion 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 safeguard
ing the potable water system
from CO
2
gas contamination.
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.
Capacity
kPa psi
207 30
172 25
138 20
103 15
69 10
35
5
0 0
.5
1
1.5
2.
2.5
gpm
1.9
3.8
5.7
7.6
9.5
lpm
2
3
4
6
7
4
6
1
2
5
7
Dimensions - Weights
B
A
ES-9BD 0940
© Watts 2009
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A Watts Water Technologies Company
SIZE(DN)
DIMENSIONS
WEIGHT
A
B
in.
mm
in.
mm
in.
mm
lbs.
kgs.
1
⁄
4
6
2
3
⁄
4
70
1
3
⁄
8
35
.38
.17
3
⁄
8
10
2
3
⁄
4
70
1
3
⁄
8
35
.38
.17