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Gastight Circular Damper Type GD-C

The gastight circular shut-off damper, type GD-C, in solid and maintenance free design, is used for systems with high tightness requirements.

Test Image 1


  • The actual leakage rates for housings and seat of damper blade are much lower than specified in the requirement according to DIN 25 496. The damper is designed to operate without any failure at an operating pressure of 1.1- times of the admissible operating pressure of the damper. The tightness of the seat of the damper blade is testable in built-in situation. For maintenance purposes, e. g. lubricating, if required, there is no dismantling of the damper from the duct system necessary. All media touched parts are welded continuously and without gaps to ensure an easy decontamination.



DN 150, DN 200, DN 250, DN 360, DN 400


electrical, pneumatic, manual, or emergency actuating by means of Hand wheel

Admissible design temperature:

up to +100°C

Admissible operating pressure:

10 000 Pa

Adm. leakage rate damper blade Incl. seat of damper clade acc. DIN 25 496:

<10 l/(h-m²) at 1 bar, 20°C and Δp = 2.000 Pa

Adm. leakage rate housing Incl. shaft transition acc. DIN 25 496:

<10 l/(h-m²) at 1 bar, 20°C and Δp = 2.000 Pa


Robust damper housing:

stainless steel, material 1.4301 (AISI/SAE 304). In gastight design

Circular damper blade:

stainless steel, material 1.4301 (AISI/SAE 304)

Gas-tight shaft transition through housing:

shaft sealing made of viton

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