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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.
Injector Cap, Screen, Injector Plug and Injector
The screen, injector and/or injector plug(s) are installed under the injector cap in an easy to access location on top of the valve. The injector cap
contains four slots so no water accumulates in the cap. The injector cap is designed to be hand tightened.
Under the injector cap there is an easy to clean removable screen to prevent fouling of the injector. There are two holes under the injector cap
labeled "DN" and "UP". The holes will be filled with a plug or an injector.
The plug (Order # V3010-1Z) prevents water from traveling a certain pathway. The injector lets water pass through the pathway. The self-
priming injector increases the velocity of the water, creating a zone of negative pressure that draws in the concentrated liquid regenerant, such
as sodium chloride (brine), potassium permanganate, etc. The regenerant blends with the stream of water, which passes through the media to
regenerate the bed.
The injector provides a consistent regenerant/water mixture ratio over the entire operating pressure range of the control valve. The injector
provides good performance in a variety of applications, which may involve elevated drain lines and long regenerant draw lengths. Injectors
are chosen by knowing the type, amount, and regenerant flow rate for a particular type of media. Guidelines can be found in the media
manufacturer's literature. The color coded injectors give different regenerant draw, slow rinse and total flow rates over the pressure range.
See injector graphs (pages 25-28) for total, slow rinse and draw flow rates.
The control valve has been manufactured to be one of the following:
• regeneration downflow PWSRTA (for softeners or regenerating filters install injector in DN location, plug in UP location)
• regeneration upflow PWSRTA (upflow option is for softeners only, which are not EA, EE or EI control valves. Install injector in UP location,
plug in other hole location)
• no regenerant PWSRTA (both the DN and UP holes have injector plugs installed) and plug installed for the refill elbow
NOTICE
It is okay to field convert valves from upflow to downflow and
vice versa with the PWSRTA valve as long as software supports
upflow brine.
Refill Flow Control Assembly or Refill Port Plug
The refill flow control assembly consists of a refill flow elbow, refill flow control retainer assembly, refill flow control, polytube insert and nut
assembly. The refill flow control retainer fits in the refill elbow. The refill flow control retainer houses the refill flow control which controls the flow
rate when the regenerant tank is being refilled. The refill flow control is a flexible washer-like part with a small orifice and a precision molded
contour that delivers a steady 0.5 gpm regenerant tank refill rate at varying inlet pressures. Refill is accomplished with treated water.
The refill flow control assembly is installed in an easy to access refill elbow located on top of the control valve. The refill flow control assembly is
attached to the control valve with a locking clip. The locking clip allows the elbow to rotate 270 degrees so the outlet can be orientated towards
the regenerant tank.
The control valve has a standard refill elbow to which a 3/8" flexible tube can be connected. An optional elbow can be ordered which
accommodates a ½" flexible tube for a high regenerant draw rate situation. Both elbows use the same refill flow control and retainer.
If the control valve is to be used as a non-regenerant filter control valve, the refill elbow is removed and replaced with a refill port plug P/N V3195-01.
36
PWSRTA Twin Alternating Series Softeners
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