A second rotor has been added to the PMV modular rotary valve to give it self-cleaning capability. The second rotor of the PMDS double rotor valve is synchronized and gear-driven to scrape clean the rounded pockets on the primary rotor on each revolution. As with the company’s other rotary valves, the double rotor valve is precisely engineered with modular construction that makes it quicker and easier to maintain and service than valves with cast housings. Like the PMV rotary valve, the PMDS can be manufactured in severe-duty (500 Brinell alloy) or ultra-duty (ion-nitrided) versions. It can also be manufactured from stainless steel if required, and is available in the same size range as the PMV rotary valves. Precision Machine & Manufacturing Inc., Eugene, OR 800-722-9841 www.premach.comPrecision Machine & Manufacturing Inc.