Valves are indispensable components in the design and operation of chemical and petrochemical systems, as their role is ...

The fuel tank needs to maintain a certain pressure during launch; shuttle program manager John Shannon said it's unclear how serious it would be if that did not happen. "We're going to make sure.

However, the untimely failure of a pressure valve near State Highway 158 that regulates water coming from T-Bar Ranch failed. Officials noted that the city didn’t have a spare valve.