when transferring petroleum products using air-operated double diaphragm pumps, the low air supply and discharge pressures mandated by underwriters laboratories code 79 requirements can significantly affect overall pumping efficiency. As a result, it is often necessary to specify a larger, more expensive pump to meet desired transfer rates.
fortunately, yamada has developed a series of ul listed pumps to overcome this difficulty. Yamada 3/4” and 1” ul listed diaphragm pumps were specifically designed for the safe transfer of volatile liquids at maximum capacities of 26 and 44 gpm respectively (depending on model) while maintaining strict adherence to ul code 79. Maximum transfer capacities as high as 44 gpm (1” model). Patented, self-lubricating air valve never needs internal or external lubricating. Non-stalling air valve which includes a non-centering, spring assisted shuttle ensures a positive shift every time. Outside accessible air valve allows for inspection and maintenance without removing the pump from service. Short stroke design reduces flex, extends diaphragm life.