Flowseal Guillotine Dampers are designed and fabricated to meet the requirements of power and industrial plants and comply fully with the requirements of AMCA publication 850-84. They provide effective and reliable isolation in hot, noxious, corrosive and dirty gas flow conditions.
All Flowseal Guillotine Dampers utilize a rugged and heavy duty chain and sprocket drive system to provide a positive drive to the gate in both directions. The reliability of this system has been amply ploved through years of use.
Flowseal Guillotine Dampers are designed so that all parts are field replaceable without removing the frame from the duct. Chain drive maintenance is simple and can be performed whilst the system is on line.
Associated Terms:
- Spade damper
- Knife damper
- Knife Gate Damper
- Gate Valve
- Gate Damper
- Chain Drive Damper
- Sprocket Driven Damper
- Tight Isolation Damper
- Purge Air Sealing Damper
- Total Isolation Damper
- High Sealing Efficiency Damper
- Low Leakage Damper
- Circular Guillotine Damper
- Rectangular Guillotine Damper
- Shut Off Damper
The following styles of guillotine dampers are available:
Type AS single blade Guillotine Dampers.?
Sealing efficiency : 99% of full flow or better.
Type SS spring seal single blade Guillotine Dampers.?
Sealing efficiency : 99.9% of full flow or better.
Purge Air Isolation Guillotine Dampers?
Sealing Efficiency: 100%
The damper seal (similar to Type SS) is assisted with the introduction of purge air into a manufactured cavity, at a higher pressure than the system pressure. This procedure creates an air curtain beyond which the lower pressure cannot travel.
Although this is a Total Isolation damper it cannot be perceived as Man-Safe due to the possibility of purge air supply failure.
General Design
Construction
Frames?
Frames are designed to be entirely self-supporting in the duct with no external mounting or anchoring required and are normally fabricated from carbon steel channel sections. The flanges are pre-drilled to customer requirements. On duct openings wider than 2000 mm, one or more pipe blade guides are installed on the downstream side of the gate in the plane of travel.
Gate?
The gates are fabricated from a single thickness solid plate in Corten A, 3CR12 or other exotic material as may be required. The thickness of the gate is designed so that deflection under full differential pressure, when closed, is less than 1/360th of the duct width. The gate is fully retracted from the duct when in the open position, thus completely eliminating thermal distortion of the gate.
Gate entry seals?
Sealing to atmosphere at the gate port is accomplished by stainless steel spring leaf type seals or pneumatically operated top hat seals. The latter is recommended when the system is under positive pressure.
Chain drive?
The dampers utilize a dual chain drive using WH78 chain and with sprockets fitted to a drive and an idler shaft. The chain is to be capable of driving the gate with only one chain working and this is to be tested in the works prior to dispatch. The shaft bearings are to be of the maintenance free type.
Actuators?
Flowseal guillotine dampers can be furnished with electric, hydraulic or manual actuators. The actuators are sized to function reliably over the full range of system temperatures and pressures with a minimum factor of safety of two. Actuators may be fitted with manual overrides and fail safe open or fail safe closed devices if required. All actuators are fitted at the factory and fully tested prior to shipment.