Our damper systems are designed to precisely control gases and ensure optimum performance in industrial applications: gastight dampers, pressure relief dampers, louver dampers, non-return dampers and pressure surge dampers. Thanks to their robust construction and high-quality materials, our damper systems are extremely reliable and durable. Stainless steel 1.4301, 1.4404, 1.4541 and 1.4571; standards DIN 25496, ISO 3834-2, KTA 1401, ASME AG-1, ISO 19443. The Krantz gas-tight dampers are equipped with connection adapters for carrying out the leak test of the valve blade and the shaft bushing in accordance with DIN 25496. Barrier systems can be designed in various sizes, from circular and square to rectangular. In the drive type segment, we offer manual, electric, pneumatic, fail safe and other versions. Applications include pressure relief dampers for room equalisation, pressure surge dampers for explosion protection, and gas-tight dampers as building end dampers with IEEE or SIL-capable actuators.

Gas-tight rectangular shut-off damper GD-R

The gas-tight rectangular shut-off damper GD-R falls well below the tightness requirements of DIN 25496 "Ventilating components in nuclear facilities".

• Rectangular up to 1,800 × 1,200 mm; square 400 × 400 to 1,200 × 1,200 mm; manual, electric, pneumatic or fail safe actuator
• Operating temperature -40 °C to +90 °C; operating pressure 10,000 Pa; blade differential pressure 10,000 Pa in closing direction; radiation resistance ≤ 10⁵ Gy
• Leakage of blade including seat, and housing including shaft feedthrough, to DIN 25496: < 10 l/(h·m²) at 1 bar, 20 °C, Δp = 2,000 Pa
• Stainless steel, e.g. 1.4541; two concentric silicone seals with test groove; linear-then-tilt lever kinematics; toggle-lever locking in end positions; tested at 1.1 × operating pressure
• Applications: nuclear, laboratories, hospitals, industry

Gas-tight circular shut-off damper GD-C

The gas-tight round shut-off damper type GD-C in a solid and maintenance-free design is used for the ventilation of sensitive areas with high demands on the tightness of the damper systems.

• DN 80 to DN 400; manual, electric, pneumatic or fail safe; up to +100 °C; 10,000 Pa
• Leakage to DIN 25496 < 10 l/(h·m²) at 1 bar, 20 °C, Δp = 2,000 Pa; materials 1.4301 and 1.4408; Quadring blade seal including leak test; Viton shaft seal; test groove per DIN 1946-4 and KTA 3601
• Testable installed; no removal for maintenance; emergency hand wheel
• Related: gas-tight square shut-off damper; GD-S rectangular damper; AD-Chightec circular damper with seat to EN 1751 class 4; louver damper ND-J gas-tight design with seat to EN 1751 class 4

Gas-tight shut-off slide damper HAS

Space-saving, gas-tight shut-off slide dampers are sometimes required to shut off ventilation systems. The Krantz shut-off slide damper is gas-tight in accordance with DIN 25496. Due to its low design and reliable function, it is particularly suitable for shutting off HEPA filter housings such as the Krantz Nuklear Karlsruhe filter systems. DN 250 and DN 350; up to +90 °C; ± 6,000 Pa; housing and blade 1.4301, spindle 1.4501; threaded spindle with lifting mechanism pressing the plate vertically against the flange to avoid seal abrasion. A gas-tight shut-off slide damper for high volume flows is also available.

Pressure relief dampers KL-E, KL-EM, KL-ETE and KL-ETM

In a great variety of different applications within HVAC systems pressure relief dampers manufactured by Krantz are used to limit the pressure or control it: ductwork protection from excess positive or negative pressure, positive-pressure ventilation of staircases, defined pressure drops between rooms. The pressure relief damper KL-E is a design variant provided with control function which, as soon as the opening pressure is exceeded, keeps the pressure in the ductwork nearly constant, independent of the volume flow. When the pressure in the ductwork reduces to its normal range after the malfunction has been remedied, the damper closes automatically. Volume flow 0 to 17,000 m³/h; adjustable opening pressure 600 to 2,500 Pa; housing 1.4301 or galvanised; airtight per DIN 1946-4 when closed.

Non-return and pressure surge dampers RK-E20, RK-E30 and RK-F10

Pressure surge dampers are used in the chemical and pharmaceutical industries to protect buildings, processes and people from explosion pressure waves. The RK-F10 is dimensioned for a pressure surge of 0.5 bar with approximately 100 ms rise and 1 s duration; 200 × 500 to 1,250 × 1,250 mm; depth 200 mm; 100 °C; stainless steel e.g. 1.4541; no auxiliary energy; spring balancer pre-tension with default closing pressure 3,500 Pa; functions as rain protection grille when open. Non-return dampers RK-E20 and RK-E30 and a film non-return damper for lowest opening pressures complete the range.

Gas-tight doors GT

Gas-tight doors for increased requirements on material and tightness. Stainless steel doors in rigid, torsion-resistant design for rooms with high tightness requirements; optional gas-tight inspection window; optional hydraulic door closer. Suitable for use in nuclear facilities and industry.