Days after Granada Hills and Porter Ranch lost water service, L.A. Mayor Karen Bass and other officials urged thousands of ...

CO 2 refrigeration (R-744) systems operate at significantly higher pressures compared to legacy hydrofluorocarbon (HFC) systems. For example, on hot summer days, between its medium-temperature ...

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

Variable valve timing, on the other hand, is used mainly for emissions control. Essentially, it allows the engine to advance or retard the valve timing using oil pressure.