KNF gas process pumps with integrated, leak tight safety diaphragm system are the ideal solution for safely transporting hazardous, toxic, rare or costly gases. The redundant, secondary diaphragm ensures ultra-low leak rates of < 6 x 10-6 mbar l/s, and effectively creates a safeguard to contain gases without risk of escape. Additionally, the system prevents contamination from external influences.
Leak tight, double diaphragm gas pumps are particularly well-suited for many physics analysis applications such as: cryostats, pulse tube and dilution refrigerators, helium liquefiers, noble gas purifier systems (dark matter detectors), or anywhere purity and containment are of paramount importance. Additional applications include: dangerous emissions sampling and monitoring, chemical and nuclear process engineering, and handling pyrophoric gases
The unique double diaphragm design pairs a "safety" diaphragm with an elastic "working" diaphragm held securely at the edges. An eccentric and a connecting rod move both diaphragms up and down, at their center, and the "working" membrane transfers the gas through automatic valves. Both diaphragms enclose a pressure- and vacuum-tight intermediate safety space that can be monitored for pressure changes, and serves to prevent contamination. Combined with additional head machining and sealing rings, the double diaphragm system can dramatically enhance gas tightness.