The Precision Controls Division (PCD) of Marsh Bellofram Corporation has announced the global market introduction of the Type 77 industrial vacuum pressure regulator series. The Type 77 is a single control unit for high-performance monitoring and control of pressures from 29" Hg vacuum to 150 psi. Featuring an aluminum die-cast construction with weather-resistant vinyl paint finish, the Marsh Bellofram Type 77 vacuum regulator incorporates a fixed negative 15 psig bias spring to maintain vacuum outputs and controlled system pressure from 29" Hg, with flow capacity to 40 SCFM. An adjustable opposing range spring increases controlled pressure outputs. Output pressure droop under varying downstream flow conditions is minimized by the incorporation of an aspirator tube, which adjusts the air supply valve opening in accordance with flow velocity. The dampening action of the aspirator tube maintains continuous and stable output pressure.