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APS 16123

F355 Spring Set Bypass Regulator

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DESCRIPTION

F390 (3-inch) and F387 (4-inch) air set by-pass regulators The by-pass regulating valves are normally mounted in pump bypass  return lines. They are usually installed as secondary pressure controls.  However, where maximum low flow stability is required, they may be utilized  as primary pressure controls when used in conjunction with an inline air  set demand regulator similar to the 4-inch model F370. The air set  demand regulator valve will provide positive required deadman closure and  surge control features not contained in the by-pass regulator. The by-pass regulators will maintain a constant pressure at a downstream sensing point, such as a venturi, as a function of the supplied reference pressure. An optional feature allows the valve to also control maximum  inlet pressure providing pump outlet pressure protection. Normally these  units are capable of acting as secondary controls to larger sized primary  or deadman controls. It is our opinion that the by-pass valve should normally  be used as the primary control.