Linear piston vacuum pumps    linear diaphragm    rocking piston    diaphragm pumps    micro / mini pumps    laboratory systems    sampling pumps     Asia Pacific     Europe     America     Gast Manufacturing, Inc - - P.O. Box 97, Benton Harbor, MI 49023-0097, USA email, Tel. Products: piston air vacuum pumps Our piston air compressors and vacuum pumps are built to withstand the most rugged operating conditions, with corrosion-resistant materials used for critical internal parts. These air compressors and vacuum pumps are available in motor mounted and separate drive versions. MEDO U.S.A., INC. - - 4525 Turnberry Drive, Hanover Park, IL 60133, USA email, Tel. Products: Linear-Piston Vacuum Pumps, 3 to 70 lpm Features: – Linear-Motor-Free Piston System (one moving part - the piston) – Vibration Isolation Assembly – Self-Cooling Design – Hyper Pressure Control Mechanism – Oil-Free Operation – Compact Integrated Design – UL & CE Recognized TeleChem International, Inc. - - 524 East Weddell Drive, Sunnyvale, CA 94089, USA email, Tel. Products: linear oil free vacuum pumps TeleChem’s ArrayIt® brand vacuum pumps (Cat. AVP and AVP220) set a new standard for oil-free laboratory vacuum pumps. Our AVP products are extremely quiet, rugged and durable, and can be used for the full spectrum of microarray laboratory applications including solution filtration, vacuum stations in microarray robots, vacuum manifolds for DNA purification, cleanroom, and many other laboratory applications. Linear Pump: The activated electromagnet attracts the piston against the return spring, while air is taken into the cylinder through the open inlet valve. When the electromagnet is deactivated, the return spring pushes the piston back, and the compressed air is moved out of the cylinder through the outlet valve.     Keywords     www.vacuum-guide.com