SECTION 2-7
EQUIPMENT DESCRIPTION
FLOWMAX RO MANUAL REV: B 05/1999
USFilter
United States Filter Corporation
2.3 MECHANICAL COMPONENT DESCRIPTION
The major mechanical components that make up the RO unit are described below.
Automatic Feed Water Control Valve
An automatic valve is mounted in the RO unit feed piping. This valve will shut off flow to the unit
when it shuts down. A solenoid valve mounted in the Control Panel controls the operation of this
valve. The solenoid requires 80 PSIG instrument air from an external source.
Feed Pressure Gauge
The line pressure from the filter inlet is displayed on a 0-100 PSI pressure gauge. The gauge has a
100mm stainless steel case, and is constructed of all stainless steel wetted parts and is glycerin filled.
High Pressure Pump
The RO unit has a high pressure booster pump mounted to the frame to boost the feed water to the
required operating pressure for the reverse osmosis membranes. The pump is a vertical or
horizontal, multi-stage type with stainless steel construction of all wetted parts. The pump is
designed to provide the pressure and flow necessary to operate the system, with additional pressure
available to allow for fouling or a minor decrease in feed water temperature. The FlowMax Series
RO units are also available with a submersible multi stage pump with stainless steel impellers.
Low Feed Pressure Switch
A low feed water pressure switch is provided to protect the pump. It is adjusted to shutdown the RO
unit if the inlet feed water pressure drops below the setpoint. The switch is wired through a delay
timer to allow short pressure drops such as those that occur when the pump starts up.
Pump Discharge Throttling Valve
The water discharged from the high pressure pump is regulated by a stainless steel ball valve. By
adjusting the position of the valve, you can regulate the flow and pressure feeding the first stage
pressure vessels of the RO unit. The valve is also equiped with a locking device, which must be
used to maintian correct valve position.
Pump Discharge Pressure Gauge
The outlet pressure from the high pressure pump is displayed on a 0-600 PSI pressure indicator.
This gauge has a 63mm stainless steel case, and is constructed of all stainless steel wetted parts, and
is glycerin filled. An isolation valve between the manifold and gauge allows you to operate the RO
unit while isolating the gauge from the high pressure.
Pump Discharge Pressure Switch
A high discharge pressure switch is provided to protect the downstream components of the system
from excess pressure. It is adjusted to shutdown the RO unit immediately if the pump discharge
pressure exceeds the setpoint.
High Pressure Manifold
The pressurized feed water is piped through 316L stainless steel high pressure manifolding. The
