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“Apollo”
Flow Controls
INSTALLATION, OPERATION & MAINTENANCE
MANUAL
The Reduced Pressure Detector Assembly (RPDA Type 1) contains a mainline RP incorporating two independently acting, spring-loaded check
valves with a diaphragm-actuated spring-loaded relief valve located between the checks and a bypass line consisting of an approved RP
assembly and a water meter. The RPDA Type 2 contains a mainline RP and a bypass line consisting of a single check valve and a water meter
(A Type 2 bypass utilizes the first check of the mainline as the first check of the bypass and the single check on the bypass as the second
check). Each device is equipped with test cocks for periodic field testing and is normally supplied with inlet and outlet shut-off valves. NOTE:
UL and FM installations must include indicating type shut-off valves.
During no flow conditions, the mainline and bypass check valves will remain closed. If there is a low flow demand (up to a minimum of 2
gpm) of water downstream, the flow is routed through the water meter to monitor such consumption. If the downstream pressure increases
above the supply pressure or there is a reduction in the inlet pressure, the mainline and bypass check valves will close to prevent backflow.
VI.
DESCRIPTION AND OPERATION
VII. INSTALLATION
1. The RPDA must be installed in an accessible location to facilitate periodic field testing and maintenance.
2. Flush all upstream piping thoroughly to remove foreign matter prior to installing the device.
3. The device must be installed in the horizontal position. A clearance of 12” to 30” between the lower most portion of the device and flood grade or
floor should be provided for ease of maintenance.
4. If shut-off valves are provided separately, they must include tapped bosses for attachment of the sensing hose, bypass piping, the #1 test cock,
and the #2 test cock. Contact the factory for installation instructions.
5. After installing the assembly and with downstream (#2) shut-off valve closed, pressurize the device and bleed air through test cock #4. Then
open #2 shut-off valve.
OTHER INSTALLATION TIPS
• The installation location should have adequate drainage for relief valve discharge. The device should never be placed where it may be sub-
merged in standing water. Do not install in areas subject to freezing without using a properly designed enclosure.
• As in any piping system, provisions should be made to minimize water hammer and pressure rise due to thermal expansion, as these conditions
can create damaging and dangerously high internal pressures.
• A “Y” strainer can be installed just upstream of the RP assembly to eliminate any debris from entering the device and fouling the check and/or
relief valve. Note: Strainers are normally not allowed on fire protection systems. Check with local authorities.
