HOMELecture of Valves Why does dew condensation occur? What makes the 702Z dew condensation free? What is the material "PPS"? Availability of auto actuated type, and size range? Are there any cases in which 702Z will suffer from dew condensation? 12 years ago Tomoe launched a strong , light-weight die cast aluminium bodied valve. 3 years later we developed a "Dew Condensation-Free" version which is becoming increasingly popular in the marketplace. How did Tomoe succeed in developing this dew condensation-Free characteristic? Here we introduce to you various design aspects which have been adopted by the 702Z in order to eliminate dew condensation what is the cause of dew condensation? How did we solve the problem?