Diaphragm Pump Technology

Pilot Valve Troubleshooting: Why Your Yamada NDP Pump Is Cycling Unevenly The pilot valves inside a Yamada NDP pump may be small, but they play an important role in the pump’s cycling performance. As the diaphragms reach the end of each stroke, an inner center disk slightly depresses a pilot valve. This creates the pressure…

Slurry & High‑Wear Oil & Gas Applications (and where Yamada AODD pumps fit) In oil & gas, “slurry/high-wear” usually means fluids carrying abrasives (sand, scale, catalyst fines, proppant residue, rust) that rapidly wear pump internals. These services often appear in upstream production facilities, midstream terminals, and maintenance/turnaround work—especially where you have dirty, variable, intermittent flow.…

For pumping oil with a pneumatic pump, the most common and reliable choice is an air‑operated double diaphragm (AODD) pump—especially for transfer, unloading, sump/containment, and dirty oil services. In the Yamada lineup, this is typically the NDP Series (our flagship industrial AODD family). https://www.yamadapump.com/ndp-series/ Why an air‑operated pump is a good fit for oil Yamada…

In an AODD pump, the elastomer selection typically covers the diaphragms, ball checks, valve seats (sometimes), and O-rings. The “right rubber” is the one that best fits your chemical, temperature, and duty cycle, while meeting any abrasion or food-contact requirements. Step-by-step selection process 1) Identify exactly what’s being pumped Chemical name(s) and concentration (%) Temperature…