Shut-Off Devices

NAK

FOR THE GAS-TIGHT SHUT-OFF OF DUCTS

Gas-tight shut-off dampers are designed to ensure the level of tightness required by KTA Guideline 3601 (German Nuclear Safety Standards Commission, KTA) and by DIN 25414 even when the power supply or compressed air supply fails.

  • Compact design and robust actuator mechanism allow for any installation orientation
  • Maximum air leakage rate is 0.0028 (l/s)/m² or 0.01 (m³/h)/m² at a differential pressure of 2000 Pa
  • Gas-tight closure, even when there is no power, due to special over centre locking mechanism
  • Variants with hand wheel, pneumatic actuator or electric actuator
  • Brass and stainless steel bearings
  • Powder-coated casing and blades
  • Maximum pressure loading of 5000 Pa, in closing direction
  • Available in standard sizes and many intermediate sizes

Optional equipment and accessories

  • Flange holes
  • Limit switch
  • Double acting pneumatic actuator, with optional solenoid valve
  • Electric actuator 3 × 230 V AC (400 V AC) or 230 V AC

Attachment, Integration

Z0* – GAS-TIGHT DAMPERS

FOR CAPTURING THE END POSITIONS (OPEN AND/OR CLOSED) OF DAMPERS AND PROVIDING THE CONTROL INPUT SIGNAL FOR PNEUMATIC ACTUATORS

Limit switches for gas-tight shut-off dampers, solenoid valves for gas-tight shut-off dampers with pneumatic actuators

  • Limit switches for capturing the end positions of gas-tight shut-off dampers
  • Solenoid valve to provide the control input signal for NAK-P
  • Different opening and closing times can be set using throttle valves (at least 2 s)