Konvekta - Model KHDR-NR -Heavy Duty Non Return Dampers

 Blades:

150mm pitch single skin 1.5 or 2.0mm thick material, overlapping action in mild steel, galvanised or stainless steel

Shafts:

20mm diameter continuous shafts in 316 stainless steel

Linkages:

Side linkage, out of airstream, 3mm thick stainless steel quadrant arms and link bars.

Bearings:

Oilite bushes (‐9 to + 70 deg. C) standard. High temperature Oilite bushes to 220 deg. C. Graphite bronze to 300 deg. C. 25% carbon filled PTFE (chemical resistance)

Operation
Gravity Operated:

Externally linked blades to move uniformly in response to air velocity and pressure

Counterbalance Weights:

Counterbalance weights can be provided to:
Assist or restrict blade operation in response to airflow
Regulate blade operation when airflow is vertical
Weights are attached to an optional adjustable external crank arm.
*If required, the dampers can be pre‐set in our factory to open at a specific pressure

Seals
Blades:

Metal to metal overlapping blade operation. Blade ends – close fit to inner casing

Shafts:

Oilite bush or glass filled PTFE bush as standard.
*Options available – Lip seals, "O" ring seals, flange mounted remote bearings. Enclosed and sealed linkages.

Size Range:

From 200sq to 1250sq in one module. *Above these sizes in multiple modules with joint flanges

Alternative Options:

Non standard casing depths and flange widths to suit customer requirements
Circular drilled flanges in RSA and to BS & DIN standard patterns
Polyester powder coat finish
Food quality options available, including gaskets