Designed to fit into existing pressure systems, the Mark 401 enables the outside plant craftsman to maintain and direct air pressure to areas where the requirement for cable protection is the greatest. Requiring minimum installation time, the Mark 401 Pressure Controller can be used in the following applications. As a single unit to lower the pressure of an entire manifold system when the pressure available from the pipe is greater than required. On a selective basis, one or more 401 Pressure Controllers are installed on the manifold. This arrangement permits individual pressure control of each outlet.
Single manifold feeds both aerial and underground cable.
In problem areas where a bad section can make it difficult to hold pressure on the entire system, a Mark 401 placed between the manifold and the feeder hose will restrict flow to a troubled area thus making it possible to maintain underground pressure. When underground cable goes aerial, two pressure conditions are desired. A Mark 401 Pressure Controller, in conjunction with a bypass in a plugged riser, prevents the aerial section from draining the underground, while at the same time supplying adequate pressure to the aerial. The Mark 401 is constructed of nickel plated brass to telephone company standards. It operates in the 0 to 100 PSI pressure range, eliminating the possibility of damage due to sudden accidental increases in pressure.