Product Focus: Pumps and Valves

Umbrella Check Valves

Air Logic, Racine, WI, has created low cracking force in-line non-return valves. The plastic bodies with preloaded elastomer umbrellas are designed to mitigate the common problems of previous check valves, such as chemical attacks and inconsistent performance. The polypropylene and silicone model was engineered specifically for the medical device industry to be compliant with industry ratings such as ISO 10993 and avoids the incorporation of common conflicting materials such as BPA. There are preset options of cracking pressures under 2 psi with five different barb sizes, as well as the option to customize

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Media Isolation Valves

A series of valves from Clippard, Cincinnati, OH, offers a compact, 10 mm glass-filled nylon body. With an EPDM diaphragm that separates the actuation mechanism from the flow path, the E2S series is ideal for dispensing a wide range of aggressive gases and liquids in applications that require compact, electronically controlled valves that have minimal back pressure. Applications include printing equipment, medical diagnostic devices, dental equipment, fermentation, water treatment, dispensing, and more.

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Pressure Control Valves

Emerson, St. Louis, MO, has released a series of electronic proportional pressure control valves. With a control deviation of less than 0.5 percent, the AVENTICS Series 625 valves are designed to deliver highly accurate, electronic proportional pressure control and provide the flexibility needed to support sophisticated pneumatic control engineering applications. Four valve sizes from 1 millimeter up to 20 mm support a comprehensive range of flow rates, from 55 to 4,700 L/min. Pressure capabilities range from vacuum levels up to 50 bar, which can reduce the overall number of valves required for a machine design.

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Piezo Actuators

PI, Auburn, MA, offers high-speed actuators for micro- and nanodispensing applications. Both standard and custom-designed actuators are available. All actuators are based on PI’s in-house manufactured PICMA^® piezoceramic drives. The actuators are available as bare piezo stacks and in highly customized forms with motion amplifiers and integrated sensors. Standard stacks provide a travel range of 30μm, and motion-amplified actuators can reach hundreds of microns while still providing sub-millisecond responsiveness.

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