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Pumps

Scanning for Ideas: Shock-resistant rotary union handles water, hot oil, and air

The 2000 Series rotary unions from Duff-Norton, Charlotte, N.C., transfer air and fluids, including oil and water, from a stationary supply to a rotating component such as a drum or roll.

More Efficient Pumping for Fuel-Cells

A positive-displacement blower pulls hydrogen gas through a pair of smoothly meshing rotors to recirculate fuel for fuel-cells.

Hydraulic hybrids are picking up

The hybrid powertrain in a Prius won’t help much if the task is moving tons of refuse.

Hydraulic hybrid truck undergoes field tests

New York City's Department of Sanitation and Baltimore's Bureau of Solid Waste will test hydrostatic regenerative brakes from Bosch Rexroth, Rochester Hills, Mich.

Butterfly valve keeps torque low

The Type 567 plastic butterfly valve from GF Piping, Tustin, Calif. (gfpiping.com), works with pressures up to 150 psi.