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industrial & commercial water treatment systems worldwide by pure aqua, inc.
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Water Filter & Softeners with Clack WS1EE Control Valve

Product Description

Clack's WS1 Automatic valve is a state-of-the-art control head designed for residential and commercial applications requiring flow rates up to 27 GPM (6.1 m3/hr). It has a backwash abilitiy capable of servicing up to 22" diameter tanks.

The valve acts as a primary center that directs and regulates all cycles of water softening or filtration. It can be set to perform downflow regeneration or simply backwash and rinse.

The valve comes in different program versions and is controlled by a solid state microprocessor with front panel setting and screen display.

The WS1 has 9 injector sizes to choose from for different draw rates.


Inlet/Outlet Fittings

¾" to 1.5” NPS


 up to 6

Valve Material 

Noryl (1) or equivalent



Flow Rate


Service @15 psi drop (includes bypass and meter)

28 gpm

Backwash @ 25 psi drop (includes bypass)

15 gpm

Cv Service


Cv Backwash .


Operating Pressures



20 psi – 125 psi

Operating Temperatures



40º – 110º F




. ± 5%

Flow Rate Range.

0.25 – 30 gpm

Gallon Range

20 – 1,500,000 gallons


1000 - 9,999,000 gallons

Dimensions & Weight


Distributor Pilot

1.050" OD Pipe (¾" NPS)

Drain Line

¾” or 1” Male NPT

Brine Line

3 /8” or ½” OD Poly Tube Compression

Mounting Base

2 ½” - 8 NPSM

Height From Top Of Tank

 7 3 /8”


16 lbs.

Electrical Specifications


Supply Voltage

120V AC

Supply Frequency

60 Hz

Output Voltage

12V AC

Output Current

500 mA

Tank Applications


Water Softener

6” – 21” diameter

Water Filter (2)

6” – 16” diameter

Cycles of Operation (Softener / Filter downflow)


1. Backwash 1st


2. Regenerate Draw/Slow Rinse


3. Backwash 2nd


4. Fast Rinse


5. Regenerant Refill


6. Service (downflow)

0.1-99.0 or off

  • Solid state microprocessor with easy access front panel settings 
  • Service flow rate of 27 gpm, backwash 27 gpm 
  • Front panel display for time of day, days until next regeneration, volume remaining, current flow rate and total volume used (Totalizer)
  • Four methods to initiate regeneration; meter immediate, meter delayed, time clock delayed or pressure differential 
  • Optional double backwash feature offers optimum regeneration, cleaning ability and efficiency 
  • Fully adjustable cycle times with 6-cycle control delivers controlled backwash, downflow brining/slow rinse, second backwash, fast rinse, refill and downflow service 
  • Coin Cell Lithium battery back-up with a 8 hour carry over 
  • Backwash and brining ability to 21” diameter tanks 
  • Downflow or upflow brining regeneration 
  • 12-volt output AC Adapter provides safe and easy installation 
  • Control valve design provides optimum service and backwash rates 
  • Post treated water regenerant refill 
  • Patented one piece expanding seal spacer stack assembly U.S. Patent 6,402,944 
  • Patented linearly reciprocating piston operation U.S. Patent 6,444,127 
  • Reliable and proven DC drive
[custom-usage] [/custom-usage]
[custom-documents]Clack WS1EE Control Valve [/custom-documents]
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