YPSILANT TWP., MI — An isolation valve failure led to a sanitary sewer overflow Wednesday evening at the Ypsilanti Community Utilities Authority’s wastewater treatment plant.

There are many methods of sealing valve stems on control and isolation valves. When chosen carefully, a valve stem seal provides years of reliable service, reduces environmental emissions, and ...

Nature Photonics spoke to Zongfu Yu and Shanhui Fan from Stanford University about their proposed 'one-way valve for light ... optical isolation on the chip scale is becoming increasingly important.