Symbols representingthese valves provide awealth of information about the valve it represents. Symbols show the meth-ods of actuation, the number of positions, the flow paths and the number of ports. Hereisabriefbreakdown of how to read asymbol: Every symbol has three parts (see figuretoright).
Description. Safe Harbor Dam is a dam located just 5.7 miles from Millersville, in Lancaster County, in the state of Pennsylvania, United States, near Lockport, PA.escription. Safe Harbor Dam is a dam located just 5.7 miles from Millersville, in Lancaster County, in the state of Pennsylvania, United States, near Lockport, PA.
Safe Harbor Hours. The term safe harbor refers to the hours during which broadcasters may transmit material deemed indecent for children. This safe harbor, enforced by the Federal Communications Commission, extendsâlegallyâfrom 10 PM to 6 AM and was established by the US Supreme Court case FCC v. Pacifica. This safe harbor is based on evidence that children 17 years of age and under are less likely to be in the audience during these hours.