Flomatic 89598PO Installation Manual
UNLEADED
BACKFLOW PREVENTERS
OPERATION & MAINTENANCE MANUAL
LEAD
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Table of Contents
Features and Operating Procedures.....1
Specification Sheet RPZE 1/2" - 2".....2
Installation Guidelines & Procedures.....3
Trouble Shooting Procedures & Guide.....4
Trouble Shooting Solutions.....5
General Service Procedures RPZE/DCVE.....6
Check Valve Service Procedures.....7
Relief Valve Service Procedures.....8
Pressure Vacuum Breaker Service Instructions.....9
Repair Kits for PVB.....10
Repair Kits for RPZE & DCVE.....11
How to Contact & Warranty.....12
OPERATING AND MAINTENANCE PROCEDURES
Reduced Pressure Backflow Preventer
Flomatic has a consistent backflow design that
ranges from 1/2"-10", (15mm-250mm). The Flomatic
Model RPZE II design is a more compact/economical
model and is used when space is limited. The
Flomatic Model RPZE is available in size 3/4"-2",
(19mm-50mm) with a unleaded bronze body and
cover as standard. The 2 1/2"-10", (64mm-250mm)
are manufactured with epoxy coated ductile iron
for strength.
The Flomatic backflow preventer includes tightly
closing resilient seated shut-off valves on each end
of the body. The assembly has two independent and
internally loaded check valves with a pressure
differential relief valve between them.
The pressure drop across the first check valve is
approximately 6.0 PSID (41 kPa). The relief valve
consists of a hydraulically balanced diaphragm.
The high-pressure side of the first check valve is
connected to the top of the diaphragm through an
access hole in the body of the casting. The low-pressure
side is connected to the reduced pressure zone
keeping the relief valve closed during normal
operation. This is spring loaded to force the relief
valve open when the pressure drop across the first
check reduces to approximately 2.5 PSID (17 kPa).
NORMAL FLOW CONDITION
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Flow Direction
LEGEND
Inlet Pressure
Outlet Pressure
Intermediate Zone Pressure
1
SPECIFICATION SHEET RPZE (1/2"-2") (12mm-50mm)
Features
•Unleaded body, test cocks and ball valves
•Ultimate mechanical protection of potable water,
against hazards of cross connection contamination.
•Meets all specifications of
AWWA,ASSE and USC Foundation for Cross
Connection Control and Hydraulic Research.
•Non-Interchangeable check valve assembly
•Replaceable check valve and removable 316 stainless
steel relief valve seats
•Top entry single access cover
•Vertical test cocks
•Low Head loss
•Simple construction, fewer parts
Operation
The backflow preventer shall be a Reduced Pressure
Principle and shall include a tightly closing resilient
seated shut-off valve on each end of the body.
The assembly shall be fitted with four (4) properly
located resilient seated test cocks.
The assembly shall have two (2) independent and
internally loaded check valve with a pressure differential
relief valve located between the check valves.
The backflow preventer shall meet the requirements of
the following standards:USC’s FCCC& Hr Manual,
Sec. 10, ASSE 1013 and CSA B64.4. Australia &
New Zealand AS/NZS 2845-1
FLOMATIC SPECIFICATIONS
The Reduced Pressure Principle backflow preventer
shall protect against backflow by either backpressure
or backsiphonage from a cross-connection between
potable water systems and substances that are
considered to have health hazards.
It shall consist of two (2) mechanically independent,
spring loaded, center guided check valves. It shall also
have a hydraulically dependent differential pressure
relief valve, set in an integral cast unleaded bronze
body, with a single access cover. The assembly shall
have four (4) vertical test cocks and two shut off
valves which are quarter-turn, full-port, resilient
seated and ball type.
The seat of each check valve and the relief valve
shall be replaceable. The check valves shall be held
into place by stainless steel clips and the check
valve assemblies shall be non-interchangeable with
silicone discs.
The backflow preventer shall be suitable for supply
pressure up to 175 psi (1205kPa) and water temperatures from 33 to 180 F.
2
INSTALLATION GUIDELINES & PROCEDURES
Proper installation of the assembly is essential to the correct function of the assembly.
The following instructions are important characteristics of a proper installation.
1. Before installing any of Flomatic's backflow
assemblies, flush the lines thoroughly to
remove all debris, chips and other foreign
objects. Failure to do so may make any of these
assemblies inoperable.
2. Allow sufficient clearance around the installed
assembly to conduct testing (minimum 18"
(450mm) around). The assembly should be
installed in a horizontal position with a minimal
clearance of 12" (300mm) between the relief
valve discharge port and the flood level. The
maximum height should be 30" (762mm) to
allow for testing at a reasonable height.
3. Flomatic's RPZE assemblies are approved by
national approval agencies and are to be installed
in a horizontal position. Approval agencies do
not recommend installation of a RPZE in a pit.
Flooding of the pit can result in a cross
connection contamination. If local codes permit
installation of a RPZE in a pit, adequate drainage
must be provided to prevent the pit from flooding.
4. Placement of the assembly should be planned
where water discharge from the relief valve will
not be objectionable or cause property damage.
5. Insure that the water supply pressure does not
exceed the manufacturer’s maximum water
pressure or temperature. The unit should also be
protected against thermal water expansion,
extreme backpressure and/or water hammer.
6. The most common cause of field problems
for RPZE’s is dirt or debris in the system.
At the time of installation dirt or debris will
become trapped in the first check seating area,
resulting in a continuous discharge from the
relief valve in a static or backflow condition.
THEREFORE THE SYSTEM SHOULD
ALWAYS BE FLUSHED BEFORE THE
ASSEMBLY IS INSTALLED.
7. To effectively flush the systems after the assembly
has been installed, remove the internal components
and open the inlet shutoff valve to flush all debris
from the line and assembly. If debris in the water
continues to cause problems, a strainer should be
installed upstream of the assembly.
3
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