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82
6
C
Testable reduced pressure zone backow
preventer.
DZR low lead brass body.
Max. working pressure: 150 psi.
Max. working temperature: 150°F.
574
RPZ Backow Preventer
Code Description Lbs USD
574004A ½" FNPT 5.0
317.00
574064A ½" press 5.1 336.00
59977 Replacement upstream check valve 0.1 19.70
59978 Replacement discharge valve assembly 0.2 35.30
59979 Replacement downstream check valve 0.1 22.80
59980 Replacement discharge air gap 0.1 8.60
Testable reduced pressure zone backow
preventer.
DZR low lead brass body.
Max. working pressure: 150 psi.
Max. working temperature: 150°F.
574
RPZ Backow Preventer
Code Description Lbs USD
574050A ¾" FNPT 9.5 381.00
574006A 1" FNPT 11 397.00
574056A ¾" press 9.6 414.00
574066A 1" press 11 441.00
59469
Replacement upstream check valve (¾")
0.2 50.70
59470
Replacement downstream check valve (¾")
0.2 53.90
59471
Replacement discharge valve assembly (¾")
0.3 107.00
59472
Replacement valve seat (¾")
0.1 38.00
39623
Replacement discharge air gap (¾")
0.2 12.60
Construction details ½" RPZ Backow Preventer
BACKFLOW PREVENTERS, RPZ TYPE, FOR PLUMBING AND HYDRONICS
FLOW CHANNEL
DIAPHRAGM
DISCHARGE
VALVE
UPSTREAM CHECK
VALVE
UPSTREAM
PRESSURE
INTERMEDIATE
PRESSURE
DOWNSTREAM
CHECK VALVE
TEST PORT
CAP
The backow preventer consists of two check valves and, a chamber
known as “reduced pressure zone”. The water entering the backow
preventer opens the upstream check valve and at the same time through
the channel acts on the diaphragm which closes the discharge valve
by means of the rod and then opens the downstream check valve. The
pressure in the intermediate chamber under normal operating conditions
is always less than the upstream pressure by at least 2 psi (140 mbar)
as a result of a pre-calculated pressure loss on the rst check valve.
This difference in pressure Δp between the upstream and intermediate
areas can be specied on a safety basis so that in the event of damage
occuring, or a vacuum, the discharge valve is opened when the upstream
pressure is still greater than the pressure in the intermediate area by at
least 2 psi (140 mbar). In the event of damage to the diaphragm, the
safety gasket under the thrust of the contrast spring prevents the return of
water upstream from the discharge since there is no more Δp equilibrium
between the two areas.
Complies with: ASSE 1013, CSA B64.4, NSF/ANSI 372, Low Lead Laws and listed by ICC-ES. Meets codes IPC, IRC & UPC for use in accordance with the
U.S. and Canadian plumbing codes.
Construction details ¾, 1" RPZ Backow Preventer
FLOW CHANNEL
DIAPHRAGM
DISCHARGE
VALVE
UPSTREAM
CHECK
VALVE
UPSTREAM
PRESSURE
INTERMEDIATE
PRESSURE
DOWNSTREAM
CHECK VALVE
TEST PORT
CAP
RELIEF
SCREW
NOTE: For the 3/4" to 1 1/4" models, to ensure correct operation the air
must be released in the upper part of the diaphragm by means of the
relief screw.
Function
The backow preventer can be used in all systems where there is danger
of the potable water supply system being contaminated. It prevents an
accidental reduction in the pressure in the distribution system from causing
backow from contaminated water in user installations.
Function
NEW
NEW
NEW
NEW