Shut-Off Devices

layer

Type VCD

Trox multi-leaf volume control dampers have been specifically designed for use in ventilation systems for volume, flow and pressure control. In addition, the type Cs with side and tip seals satisfies the closed blade leakage requirements specified in UL 555S Class II. 
 
Type VCD dampers are available for square, rectangular, circular and flat oval ductin.
 
The casing is a rigid and robust assembly formed from either channel frame for flanged connection to duct work or top hat section for spigot style connection. The blades are formed single skins with grooved blade tips to provide interlocking closure. Blade action is as standard parallel but can be optionally opposed action. Blade tip seals can be fitted for low leakage applications. The dampers can be fitted with hand locking quadrant or can be operated by electric actuators. 
 

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layer

NAK

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

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layer

Type BDD

  • The damper casing and blades are made from 1.5mm thick galvanized steel sheet.
  • The blades are fitted with 12 mm diameter mild steel spindle in zinc plating.
  • The blade spindles are connected to the damper casing with bearing journals which have a maximum operating tamperature of 80 °C.
  • The damper has face linkage with parallel blade arrangement.
  • Counter-weight arm(s) is fitted to the side of the damper casing complete with adjustable weights, located outside of the air stream.
  • The blades are fitted with tip seals made of Silicon rubber.

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layer

Type SLC

SLC multi-leaf volume control dampers have been specifically designed for use in ventilation systems for volume, flow and pressure control. In addition, the type C2 with side and tip seals provides low closed blade leakage performance. Type SLC dampers are available for square, rectangular, circular and flat oval ducting.
 
The casing is a rigid and robust assembly formed from channel frame with re-inforcing corner brackets incorporating corner holes to suit most flange system ductwork. The blades are extruded double skin aerofoil section. Damper has opposed blade action. Blade tip seals can be fitted for low leakage applications. The dampers can be fitted with hand locking quadrant or can be operated by electric or pneumatic actuators. 

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For general question regarding products or services you can also call:
Tel.: +60 6 678 8188 | Fax: +60 6 678 8288 (388)