INTRODUCTION
MANOWNROSM
US Filter
4
Quality audits do not improve products. They do, however, insure that a system meets
or exceeds specifications required for your system.
Customer feedback is also an important element of our program. Division heads meet
on a routine basis to review customer feedback and initiate actions that result in process
and product improvements.
1.3
FUNCTIONS OF THE SYSTEM COMPONENTS
A.
Low Suction Pressure Switch
A low suction pressure switch is incorporated into the system for the protection
of the high pressure pump. If the inlet pressure on the pump suction falls below
0.69 bar (10 psig) for longer than three seconds the switch activates a safety
shutoff in the controller.
B.
Reverse Osmosis Pump
The RO system contains a submersible pump driven by an AC motor. The pump
motor is turned on and off by a motor starter relay. The pump motor starter also
contains an overload relay.
C.
High Pump Pressure Switch
A high pump pressure switch is utilized in the system to prevent damaging
pressures from reaching the RO membranes. This switch immediately shuts off
the RO pump if the pressure exceeds safety limits.
D.
Pump Throttle Valve
A pump throttle valve is used to control the pressure and volume of water
supplied to the RO membranes.
E.
Reverse Osmosis Membranes
The prefiltered water enters the RO housing and passes over the surface of the
RO membrane. A portion of the feedwater continues out of the system through
a reject needle valve. The remainder of the water permeates the membrane and
is directed to a distribution pipeline or to an accessory storage reservoir. Percent
conversion (the ratio of RO product water to feedwater) will vary depending on
water quality and the application.
F.
Reject Throttle Valve
The water exiting the RO membranes is controlled by a reject throttle valve.
Closing the valve increases the pressure to the membranes and reduces the
amount of water to drain.
G.
Reject Recirculation (Optional)
If the system is provided with the reject recirculation option, it permits part of the
reject water to be returned to the inlet of the high pressure pump. This may
allow the conservation of water depending on the water chemistry.
H.
Product Recirculation
