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Hytork®'s 'CATS' Solenoid Valve

 
 
Download 'CATS' PDF Brochure
'CATS' Direct Mount (NAMUR) Directional Control Valves
Valve Automation Center

Hytork®'s 'CATS'  (Clean Air To Springs)  is a solenoid valve designed specifically for superior operation of pneumatic actuators.  All spring return actuators that use a 3-way solenoid valve require air to enter and leave the spring chambers. As compressed air is introduced to the actuator to push the pistons apart, air from the spring chambers must be allowed to vent. During the fail or spring stroke, the compressed air between the pistons must exhaust to permit the springs to drive the pistons together. This piston movement creates a vacuum in the spring chambers which is usually filled by ambient air that may contain dirt, abrasives, corrosives and moisture of which are bad for the actuator - reducing its performance and life.

A wrong solution for this problem is the use of a 4 way solenoid valve (sometimes referred to as "air assist"). It does prevent the ambient air from entering the actuator, but it will also pressurise the spring chambers. The actuator now acts like an air to open, air to close unit. In the unlikely event of a spring breakage or if the valve torque increases, due to line media build up within the valve, the actuator would still appear to operate normally until its fail action was needed in an emergency. At this most critical time, with supply air not available, the actuator could not perform as intended and it's function as a safety device would be defeated.

Hytork's CATS solenoid valve prevents this undesirable action from happening.

As the solenoid is de-energised, permitting the springs to push the pistons together, an internal by-pass in the CATS valve permits some of the exhausting air to fill the spring chambers at atmospheric pressure while the remainder exhausts to atmosphere. No ambient air enters the actuator.
 
Only clean supply air gets into the actuator - Air that was normally planned to be vented!- There is no pressure build up that can lead to false torque availability on the fail stroke, as in the case of air assisted springs! No extra clean compressed air is used!

The HYTORK® CATS solenoid valves can be supplied in all popular voltages and electrical classifications and with optional manual override and speed controls.

The HYTORK® CATS can also be used on Double Acting actuators as well as spring return actuators with a simple gasket rotation. This means it is only necessary to hold inventories of one style of solenoid valve: a further cost saving.

HYTORK® CATS solenoid:
  • inexpensive insurance for maximum reliability and actuator life.
  • the easiest to install and the most rugged.
  • NAMUR, not a single source special.
     
 

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Why CATS?
 
 
  • Maximises actuator life.
  • Reduces installation and initial costs.
  • Prevents actuator seal failure.
  • Prevents corrosives from entering actuator.
  • Prevents dirty air from entering actuator.
  • Proves that the actuator springs are working correctly every stroke.
  • NAMUR standard - Easiest assembly possible - only two mounting screws.
  • Eliminates brackets and tubing - mounts directly to the NAMUR pad on the actuator.
  • Only one style of solenoid valve required for Spring Return and Double Acting actuators - reducing inventory costs.
  • Further reduced installation costs when used with the COSTSAVER Backwire system.
     
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    Metric Specifications
     
    Materials of construction:
    • Valve body aluminium:
    • (Brass and 303 Stainless Steel available)

    Operating pressure & temperature:

    • 2 - 8 bar (30 - 120 psi)
    • Maximum ambient temperature 80ºC (172ºF)

    Cv value:

    • 0.3

    Coil connections available:

    • M20, PG9, Plug & Socket, 1/2" NPT

    Coil options:

    • Weather Proof:
      • to IP65,
      • AC Voltages: 6, 12, 24, 50, 110, 200, 240, 440 (50 & 60Hz)
      • DC Voltages: 6, 12, 24, 48, 110, 250
    • Explosion Proof:
      • Certified to NEMA, CSA, FM, CENELEC & SAA requirements
      • AC Voltages (EExd IIC T4): 50, 110, 120, 200, 240, 80/440 (50 & 60Hz)
      • DC Voltages (EExd IIC T6): 12, 24, 110, 240
    • Intrinsically Safe:
      • Approved as a low energy device for use in all hazardous environments. This coil operates within the constrains of the power restriction imposed by the use of safety barriers and similar devices. Intrinsically safe electrical equipment is the only accepted form of protection for high risk areas where an explosive mixture occurs more or less continuously.
    • Certified to:
      • CENELEC
      •  FM
      • CSA
      • SAA
      • For use in Zone 0 locations Group IIA, B & C (EExia IIC T6) :0.4 Watt, 24 VDC Coil.
    • Low Power:
      • 0.4 Watt, 24 VDC Coil.
    • Type N:
      • Certified for use in Zone 2 areas only
      • AC Voltages (Exd IIC T4): 50, 110, 120, 200, 240, 80/440 (50 & 60Hz)
      • DC Voltages (EExd IIC T6): 12, 24, 110, 240

    Options:

    • Manual overrides
    • Speed controls
    • Manual reset
    • Dual coil valves
    • True "fail in last position" Single coils

     
     

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    Imperial Specifications
     
    Materials of construction:
    • Valve body aluminium:
    • (Brass 303 Stainless Steel and composite available)

    Operating pressure & temperature:

    • (30 - 150 psi)
    • Minimum ambient temperature -40ºF
    • Maximum ambient temperature 150ºF (167ºF available)

    Cv value:

    • 1.2 - 1.4 (0.55 available)

    Coil connections available:

    • DIN on NEMA 4
    • 1/2" NPT conduit hub with 18" leads on NEMA 4, 7, 9
    • Other connections available, consult factory

    Coil options:

    • Weather Proof:
      • NEMA 4
      • AC Voltages: 12,120, 240 480 (50 & 60Hz)
      • DC Voltages: 12, 24, 48 & 125
    • Explosion Proof:
      • NEMA 4, 7 & 9
      • Certified to UL, CSA.
      • AC Voltages 24, 120, 240 & 480 (50 & 60Hz)
      • DC Voltages 12, 24, 48 & 125
    • Intrinsically Safe:
      • Approved as a low energy device for use in all hazardous environments. This coil operates within the constrains of the power restriction imposed by the use of safety barriers and similar devices. Intrinsically safe electrical equipment is the only accepted form of protection for high risk areas where an explosive mixture occurs more or less continuously.
    • Certified to:
      • CENELEC EEx e m
      • FMRC and CSA approvals are available:
    • Low Power:
      • 0.6 & 0.7 Watt, 24 VDC Coil.

    Options:

    • Manual overrides
    • Speed controls
    • Manual reset
    • Dual coil valves
    • True "fail in last position" Single coils
     

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     WebMaster.ValveAutomation@EmersonProcess.com


    Last Updated 11/14/08


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