The AOD pumps meet the strict standards, regulations and operational requirements that govern the manufacture of food products. The pumps have earned certification from the European Hygienic Engineering & Design Group (EHEDG), FDA conform and 3A approval. Playing a role in the ability to meet these high standards are the standard-setting diaphragms, ball valves and air control system. The diaphragms are smooth and not interrupted by any seals. Due to their integrated metal core, they also do not require the use of a diaphragm disc, which can be prone to leaks. The diaphragms are available in EPDM (FDA) or PTFE-EPDM composite materials of construction. The ball valves are insensitive against solids and have a metal core for a better suction lift. Pumps are equipped with a patented air control system. This metal-free, pneumatically piloted control system ensures accurate reversal of the main piston and is characterized by low noise levels.