Fluid flow control damper assembly
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
Dec 5, 2002
app pub date -
Apr 4, 2002
filing date -
Apr 4, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fluid flow control damper assembly having a damper vane and a piston actuator is relatively easy to install when the outer surface of a duct is inaccessible. The piston actuator includes a powder metal piston, lacking an elastomeric (for example, rubber) seal, that is closely received within a glass cylinder. The glass cylinder has a fitting that closes one end of the cylinder and is connectable to a pneumatic control system. A drive rod is connected between the piston and the damper vane to move the damper vane between an open position and a closed position.
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