As an important industrial control component, the safe operation and real-time monitoring of electric ball valves are crucial. This article proposes a state monitoring system for electric ball valves ...

A flexible vacuum gripper having miniature arrayed valves is proposed; the valves are normally closed, and opened when contacted with object. Since the gripper is made of flexible polymer material and ...

It also served as the purchasing agent for the member companies of the Bell System. In electronics, a vacuum tube, an electron tube or valve (British usage) or, colloquially, a tube (North America) is ...