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CID-01 – Zero leakage isolation damper

The type CID-01 Isolation Damper has been specifically designed to meet the tightest shut- off requirements of the industrial and nuclear markets, where isolation of ducting for filter replacement or duct inspection is required, without shutting down complete systems.

Overview

  • The Safety Function of the Isolation Damper when actuated is to close and control pressure system balancing or recirculation of air. This function may be used in both high or low demand mode applications
  • Each damper is tested to ensure there is zero leakage through the blades and casing
  • Has been assessed by Sira Certification Service with reference to the CASS methodologies and found to meet the requirements of IEC 61508-2:2010
  • Damper has achieved a SIL 2 rating

Specification

The type CID-01 Isolation Damper has been specifically designed to meet the tight shut- off requirements of the industrial and nuclear markets, where isolation of ducting for filter replacement or duct inspection is required, without shutting down complete systems. These versatile dampers can be automatically or manually operated and can be supplied with pre-drilled flanges to ease installation.
The dampers may be installed vertically or horizontally with the air flow in one direction.

Each complete damper assembly is subjected to a works pressure test of 10,000 Pa for one hour. The upstream end of the damper is sealed during the test and the pressurizing source removed. After one hour the pressure is checked to ensure that it has not dropped taking into consideration any changes in air temperature.

Dimensions

Casing

The damper casing is formed from 3.0 mm thick sheet steel into a rigid channel section to ensure proper alignment of blades and shafts. Where circular dampers are required, additional spigot adaptors are used which increase the damper insertion length from 350 to 450 mm.

Blades

The blades are a formed single skin of 3.0 mm sheet steel fitted with a closed cell pad that seals against a frame within the damper casing to provide 100% isolation.

Shafts

Continuous shafts Ø 19.05 mm with welded pivoted- blade support at each end.

Linkage

Parallel action linkage consisting of drive levers and bosses connected by flat bar link bars, driven through stainless steel pins. All linkage is contained within the depth of the casing.

Bearings

Phosphor bronze self-lubricated plain ‘Oilite’ bushes fitted into bearing bosses welded to the outside of the casing.

Shaft seals

Lipseal type fitted into each bearing boss.

CID-01 General Drawings

Material and Finishing

Part Material Finishing
Case Steel Painted or Galvanised
Case Stainless Steel – 1.4307 (304L)
Stainless Steel – 1.4404 (316L)
Blades Steel Galvanised
Blades Stainless Steel – 1.4307 (304L)
Stainless Steel – 1.4404 (316L)
Shafts Stainless Steel – 1.4307 (304L)
Stainless Steel – 1.4404 (316L)
Bearings Phosphor bronze self-lubricated plain ‘Oilite’

Product Models and Accessories

  • Damper can be supplied with either; Pneumatic Actuator, Electric Actuator, Manual Handwheel
  • Earth continuity bosses can be supplied upon request
  • Lifting lugs are provided to allow safe lifting of the damper
  • Solenoid Valves
  • Remote Indication of damper blade position using microswitches
  • Local Indication of damper blade position

Other variations to suit clients’ specific requirements are also available. Please contact sales staff for further details

Operation Principle

The Safety Function of the Isolation Damper when actuated is to close and control pressure system balancing or recirculation of air. The damper blades are fitted with a closed cell pad that seals against a frame within the damper casing to provide 100% isolation, allowing for work to be carried out within the duct network or stopping the spread of contaminates. Please note the damper is not bi-directional and air flow must be as shown in the general drawings above.

Weights

Please note the below table gives bare shaft damper weights only at the given square dimensions. Weights for specific sizes are issued on the quotation document.

Damper size (mm) Est. weight
Width/Dia. Height Depth
150 150 450 51 kg
200 200 350 40 kg
250 250 350 43 kg
300 300 350 47 kg
350 350 350 76 kg
400 400 350 80 kg
450 450 350 85 kg
500 500 350 90 kg
550 550 350 95 kg
600 600 350 127 kg
650 650 350 132 kg
700 700 350 138 kg
750 750 350 144 kg
800 800 350 150 kg
850 850 350 185 kg
900 900 350 192 kg
950 950 350 199 kg
1000 1000 350 206 kg

Installation

Dampers can be duct mounted, floor mounted, roof mounted, or bulkhead mounted depending upon the application.

Downloads

CID-01 – Zero leakage isolation damper
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