The Yamada Advantage Yamada Air Powered Double Diaphragm Pumps: Engineered for High Performance. Manufactured for Long Life. Rugged, Bolted Construction All Yamada pumps feature bolted construction, which eliminates leaks and simplifies post-maintenance reassembly. Bolted construction is superior to clamp band retainers, which frequently require frustrating, unnecessary leakage rebuilds from misalignment during reassembly. Outside-Accessible Air Valve Inspection or maintenance of every Yamada air valve may be performed without removing the pump from service. Outside accessible, making it easy to fix / inspect. Unified Air Valve Concept Common-size air valve assemblies reduce parts confusion and inventory. Pilot Valve Unique to the Yamada design is an individual modular pilot valve that actuates the air valve. It is depressed slightly by the inner center disk creating a pressure drop at one end of the air valve, allowing shifting to occur. It is maintenance free with no cumbersome snap rings or lubricated dynamic o-rings to replace or repair. Patented Air Valve Technology Incorporated in every Yamada Air Powered Double Diaphragm pump Yamada air valve technology is the heart of the air-powered double diaphragm pump and determines reliability. Yamada holds three patents on its field proven valve and enjoys a superior reputation throughout the industry. Why Specify an AODD Pump? Handles a wide variety of fluids with high solids content Self Priming Ability to Run Dry Variable flow rate and discharge pressure Portable Simple Installation Dead Head Shear Sensitive Safe Operation Submersible Pumping efficiency remains constant Cannot Overheat High Pressure capabilities No mechanical seals, couplings or motors No pressure relief or bypass needed