Cla-Val RP2M - Manual

RP-2M
Shipboard Backflow Preventer
Installation
• Positively Protects Potable Water Lines Against
the Hazards of Contamination due to Cross
Connection
• Minimum Head Loss
• Reduced Pressure Principle - Maximum Backflow
Protection
• Shock and Vibration Qualified to MIL STANDARDS
The Model RP-2 M Shipboard Backflow Preventer protects potable
water lines against contamination. This device combines protection
against backflow with exceptionally low head loss. It operates on the
reduced pressure principle, which is the accepted method of
safeguarding potable water supplies against the hazards of cross
connection.
The Model RP-2M is carefully constructed of corrosion-resisting
materials. It consists of two independently acting Poppet-Type Check
Valves and an automatic Pressure Differential Relief Valve located
between the two check valves.
The automatic Pressure Differential Relief Valve is designed to open
on a decreasing differential. It is closed whenever the inlet pressure
is 2 to 3 PSI higher than the pressure in the zone between the two
check valves. Pressure sensing is through internal porting for reliable
operation.
The Cla-Val Model RP-2M is designed to be installed in a horizontal
position with the Pressure Differential Relief Valve discharging
vertically down. Right hand mount of the Relief Valve is standard. Left
hand mount of the Relief Valve is available at extra cost. Adequate
drainage with appropriate air gap provisions must be provided for
Relief valve discharge,
Principle of Operation
When a normal flow condition exist, both Check Valves are open and
the pressure Differential Relief Valve is closed.
When flow ceases, both Check Valves close and pressure in the
zone between the Check Valves is maintained at least 2 PSI lower
than inlet pressure. Should inlet pressure drop to 2 PSI or less, the
Pressure differential Relief Valve opens the zone between the Check
Valves to atmosphere.
When a backflow condition, exists, the Pressure Differential Relief
Valve will open to maintain the zone pressure at least 2 PSI less than
the inlet pressure.
MODEL