Butter fly Isolation Dampers
Typical Application
Ordering
A range of high integrity dampers has been designed
Quantities, surface finish and other special require-
to meet the requirements of the Nuclear industry,
ments to be stated separately.
for the effective isolation of HEPA filtration systems
where low leakage, corrosion resistance and
Duct Dia 356dia
Type BID
mechanical integrity are of prime importance.
The following design features have been included:
Case Depth 100D
Material 316L
Continuously welded construction
Type Wozair:
Butterfly Manual
Single blade
Isolation Damper
Low casing leakage
Low blade leakage
Case Material:
Low airflow resistance
Stainless Steel
1.4301
= 304
(SS304)
Low noise generation
Low Carbon
1.4307
(SS304L) = 304L
Manual, pneumatic, or electric operation
Low Carbon
1.4404
(SS316L) = 316L
Wide range of materials
Excellent corrosion resistance
Case Thickness: 1.5mm upwards
Description
Nominal
Clear inside duct dimensions
Duct Size:
`Quote' Inside Diameter
Rolled casing manufactured from 1.5mm minimum
Order Code Example:
thick material, with welded seam, length over
BID/316L/1.5/356dia/100D
flanges minimum 100mm. Welded flanges 25 x
6mm thick drilled to standard nuclear spec. pattern.
A Single 2mm thick circular butterfly blade with a
one piece neoprene seal, bolted to 19mm diameter
shaft that rotates in sealed `oilite' bearings. The
shaft is extended on one side for actuator mounting.
Control Mechanism
Manual Isolating Damper: This is
operated by a robust adjusting handle
with a locking device which moves
across a quadrant plate. Moving the
handle through 90° moves the blade
from the fully open to the fully closed
position, thereby enabling the unit to
be used for volume control purposes if
necessar y.
Pneumatic and Electric Options:
These are operated by actuators which
move the blade from the fully open to
fully closed position.
Micro-switches, indicating blade posi-
tion, are also available. These units
are designed to be fully open or fully
closed.
Leakage Rates
The Isolation damper has been designed
to minimise leakage with the blade in the
closed position. Extensive testing on
350 Dia Nuclear HEPA filter Isolation
Dampers, has indicated a mean leakage
rate of 0.0001 m3/sec at a differential
pressure of 10,500 Pa. Specific require-
ments regarding leakage should be dis-
cussed with our engineers.