A.R.I. DC500 User Manual
A.R.I.
A.R.I.
Flow Control Accessories Ltd.
Kfar-Charuv 12932 Israel
Tel. 972-4-6761988 Fax. 972-4-6763402 www.arivalves.com
Backflow Preventer DC-500 -Double Check Valve
Approved under : USA : NSF61 (Drinking water), ASSE 1015, AWWA C510, Approved by the Foundation for Cross Connection Control and Hydraulic Research at the
University of Southern California, Listed for Uniform Plumbing Code. Australia : AS4020 (Drinking water), Watermark AS2845.1. France : ACS.
0302AusM-DC500-10
Installation
A. The DC-500 must be installed in an accessible
location to facilitate periodic field-testing and
maintenance.
A. Flush all upstream piping thoroughly to remove
foreign matter prior to installing the device.
C. The device may be installed either vertically (for
upward flow) or horizontally. It is recommended that
the horizontal configuration be chosen for ease of
testing and maintenance. A clearance between the lower
most portion of the device and flood grade or floor
should be provided for ease of maintenance.
D. Assemble the components before positioning into
permanent pipe installation.
E. A “Y” strainer can be installed just upstream of the
DC-500 assembly to eliminate any debris from entering
the device and fouling the check valves.
F. After installing the assembly and with downstream
or shut-off valve #2 closed, pressurize the device and
bleed air through test cock #1, #2, #3. Then open
shut-off valve #2.
Installation Tips
(a) Recommendation: Do not install in areas subjected
to freezing for a long period of time.
(b) The product must be protected from excessive
pressure increases. Pressure increases can be caused by
thermal expansion or water hammer. These excessive
pressure situations must be eliminated to protect the
valve and system from possible damage.
(c) Do not use any pipe glue, oil grease or solvent on
any parts unless instructed to do so.
(d) Do not force parts. Parts should fit together freely.
Maintenance Instructions
A. Disassembly – DC-500.
1. Close shut-off valve #2, then close shut-off valve
#1.
2. Bleed pressure from the assembly by opening test
cock #1, #2, #3.
3. Remove the cover bolts and lift the cover.
4. Remove the retainer.
5. Extract the check valves.
Note: all the disassembled parts may now be cleaned
and reassembled or, depending on their condition,
discarded and replaced with a new assembly from the
repair kit. O-rings should be cleaned or replaced as
necessary and lightly greased with the NSF approved
silicon based grease.
B. Assembly – DC-500.
1. Install the check valves. The valves must be securely
in place.
2. Install the retainer.
3. Put on the cover and close the bolts.
CAUTION:
Secure the screws with a recommended torque of
2.5 Kg/m. for models DN 15/20/25
9 Kg/m. for models DN 32/40/50
TROUBLE SHOOTING GUIDE
Symptom Cause
Check valve fails to hold 6.8 kPa.
PARTS LIST
No. Part
1. Cover Ass.
2. Retainer
3. Outlet Check valve Ass.
4. Inlet Check valve Ass.
5. Body Seal
6. Test Cocks (#1, #2, #3)
7. Body ass.
8. Clamp Ass.
9. Adaptor Ass.
a. Outlet shut-off valve not closed
completely.
b. Outlet check valve fouled with
debris.
down stream
shut-off valve #2
3
9
8
Corrective Action
a. Close outlet shut-off valve or
inspect for possible through leakage
b. Inspect and clean the seat and seal
of outlet check valve.
1
2
4
5
#2
#3
#1
6
7
8
up stream
shut-off valve #1
9
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