Brochure

81
6
C
BACKFLOW PREVENTERS, DUAL CHECK, FOR PLUMBING AND HYDRONICS
Dual check continuous pressure backow
preventer with atmospheric vent.
DZR low Lead brass body.
Max. working pressure: 175 psi.
Working temperature range: 32—250°F.
Emergency backpressure temperature: 250°F.
Certied to: ASSE 1012, CSA B64.3, 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.
573
Dual Check Backow Preventer
Code Description Lbs USD
573403A ½" NPT female unions 1.7 82.00
573406A ½" press unions 1.7 99.80
573409A ½" sweat unions 1.7 77.90
573493A ½" sweat union inlet, ½" FNPT union outlet 1.7 80.20
573503A ¾" NPT female unions 1.7 86.10
573100A* Replacement body w/washers 1.5 60.20
*See tting selection table in Section 8
AUTOMATIC AIR VENT FOR PLUMBING
Automatic air vent.
Compatible with plumbing systems.
Hygroscopic cap (anti-drip).
Lead free automatic air vent.
Max. working pressure: 150 psi.
Max. discharge pressure: 90 psi.
Max. discharge rate: 1.75 SCFM.
Max working temperature: 240°F.
Approval: NSF/ANSI 372 low lead.
NA5026
PLUMBVENT
™
Code Description Lbs USD
NA502640A ½" MNPT 0.6 42.20
Function
Float type automatic air vent designed to vent air from water at high points in
plumbing system piping. Example applications include risers, domestic hot
water storage tanks and recirculation system pump inlets. The automatic air
vent is installed in the vertical position in parts of the system where air has
possibility accumulated. It is supplied complete with a safety hygroscopic cap
that automatically closes the air discharge in case of contact with water.
Construction Diagram
Operating mechanism
The function of this device is
guaranteed by an operating
mechanism specially designed
to vent when system pressure
is high.
Antivibration and antirotation
system on the oat
This guarantees that in the rest
position the air relief valve will not
be affected by any movement of
the oat.
Construction details
SCREEN
ATMOSPHERIC VENT
Flow capacity
10
2 5
10
5
20 50
∆p (psi)
G
(l/min) (
gpm
)
20
10
5
(psi) (bar)
20
1 0
.5
10 2 5
15
1
0. 5
0
.3
Cv = 0.7
Complies with NSF/ANSI 372, Drinking Water System Components-Lead Content Reduction
of Lead in Drinking Water Act, California Health and Safety Code 116875 S.3874, Reduction
in Drinking Water Act, Vermont Act 193 - The Lead in Plumbing Supplies Law and Maryland’s
Lead Free Law HB.372, as certied by ICC-ES, le PMG-1360.