Clack WS1EE Twin 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.

Water Specialist 1” EE Control Specifications
Inlet/Outlet Fittings ¾" to 1.25” NPS
Cycles up to 6
Valve Material Noryl (1) or equivalent
Regeneration downflow
Flow Rate
Service @15 psi drop (includes bypass and meter) 28 gpm
Backwash @ 25 psi drop (includes bypass) 15 gpm
Cv Servide 7.28
Cv Backwash 2.96
Operating Pressures
Minimum/Maximum 20 psi – 125
Operating Temperatures
Minimum/Maximum 40° – 110° F
Accuracy . ± 5%
Flow Rate Range. 0.25 - 30 gpm
Gallon Range 20 - 1,500,000 gallons
Totalizer 1000 - 9,999,000 gallons
Dimensions & Weight
Distributor Pilot 1.50" OD Pipe (¾" NPS)
Drain Line ¾” or 1" Male NPT
Brine Line ⅜” OR ½" OD Poly Tube Compression
Mounting Base 2 ½” - 8 NPSM
Height From Top Of Tank 7 ⅜”
Weight 15 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 1 - 95
2. Regenerate Draw/Slow Rinse 1 - 180
3. Backwash 2nd 1 - 95
4. Fast Rinse 1 - 95
5. Regenerant Refill 0.1 - 99.0 or off
6. Service (downflow)  
  • Service flow 106 lpm (6.36 m3/h) (28 gpm), backwash flow 57 lpm (3.40 m³/h) (15 gpm) with meter and bypass installed 
  • Solid state microprocessor with easy access front panel settings 
  • Front panel display for time of day, days until next regeneration, volume remaining, current flow rate and total volume used (Totalizer), and Tank in Service Indication 
  • 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 
  • Treated/Soft water post fill and regeneration cycles 
  • 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 drives
  • Clack Control Valves are designed ideally to run light commercial or residential applications.


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(1 review) Write a Review
  • 5

    Posted by Lotfi R. on Feb 22nd 2020

    Will buy these valves again!

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