With a pressure vacuum breaker, however, a drop in the pressure of the water enables the spring to snap the check valve shut. As soon as the water pressure drops, the check valve closes and backflow does not occur.n a pressure vacuum breaker, the water travels through a check valve and causes a poppet to raise up a guide into an air inlet. The air inlet also has a valve which ordinarily remains closed.
Peter Marshall was born Ralph Pierre LaCock on March 30, 1926, to Ralph and Jean LaCock, a show business family, in Huntington, West Virginia. Following his father's death when Marshall was a teenager, he moved to New York City to be with his mother, a costume designer.
The family's life was centered on the church and their faith. When Marshall reached high school in 1985, he joined the church youth group and attended the state youth convention. At the age of 14, he made a decision to follow Christ. After high school, Marshall followed in his father's footsteps and attended Anderson University in Anderson, IN. While singing at his church in Anderson, Marshall was approached by a local producer and asked to sing for a project at Gaither Studios.