Installation and Service Manual – Metered Carbon Filter
Page 32
Copyright © 2012 Applied Membranes, Inc. All Rights Reserved.
Control
Valve
Components
Description
The CV1 control valves consist of the following components:
1. Drive Assembly
2. Drive Cap Assembly, Main Piston and Regenerant Piston
3. Spacer Stack Assembly
4. Injector Cap, Screen, Injector Plug and Injector
5. Drain Line Flow Control
6. Installation Fitting Assemblies
7. Water Meter or Meter Plug
Drive Assembly
The drive assembly consists of the following parts:
Drive
Bracket
Printed Circuit (PC) Board
Motor
Drive
Gears
Drive
Gear
Cover
The drive bracket holds the PC board, the motor, the drive gears and the drive gear cover in place.
The PC board receives and retains information, displays the information, determines when to regenerate and initiates
regeneration. The display shows different types of information in the initial system set up, installer display settings,
diagnostics, valve history, or user display settings.
The PC board powers the motor. The PC board’s two-prong jack connects wires to the direct current (DC) motor. The
motor is held in place on the drive bracket by a spring-loaded clip and a small bulge in the plastic, which fits in one of the
slots on the motor housing. The motor turns drive gears that drive the piston to cycle positions for backwashing,
regeneration, rinsing, refill or service. The motor is fully reversible (turns both ways) and changes direction of rotation to
change the direction of piston motion. The motor is easily replaced if necessary.
There are three drive gears held in place by the drive gear cover. All three drive gears are the same size. A reflective
coating is applied to the gears. As the center drive gear turns a light shines on the coating and a light sensing diode
determines if a light pulse was returned. The PC board counts the pulses and determines when to stop driving the motor.
Drive Cap Assembly, Main Piston, Regenerant Piston
The drive gears turn the main gear of the drive cap assembly, which moves the piston. The screw-driven, horizontally
moving piston stops at specific positions to direct the flow of water to backwash, regenerate, rinse or refill. The PC board
determines the position of the piston by counting pulses produced when the piston is moved. An optical sensor looking at
one of the reduction drive gears generates these pulses. Each cycle position is defined by a number of pulses. The
counter is zeroed each time the valve goes to the service position. The PC board fi ds the service position by noting the
increase in current delivered to the motor when the mechanical stop at the service position is reached. This method of
controlling piston position allows for greater flexibility and requires no switches or cams (U.S. Patent 6444127).
The valve included on your water softener includes a 1.25" diameter downflow piston. A regenerant piston is attached to
the main piston.
Spacer Stack Assembly
The spacer stack assembly provides the necessary flow passage for water during the different cycles. The all-plastic
spacer stack assembly (U.S. Patent 6402944) is a one-piece design which allows the stack to be removed using your
fingers.
The exterior of the stack is sealed against the body bore with self-lubricating EPDM o-rings, while the interior surface is
sealed against the piston using slippery self-cleaning directional (one-way) silicone lip seals. The lip seals are clear in
color and have a special slippery coating so that the piston does not need to be lubricated.