PBVs are used to force a specified pressure (head) drop across the valve. The valve can be in one of three states: partially opened (i.e., active) to maintain its pressure setting on its upstream side when the downstream pressure is below this value fully open if the downstream pressure is above the setting closed if the pressure on the downstream side exceeds that on the upstream side (i.e., reverse flow is not allowed). If the head upstream is lower than the valve setting, the valve will open fully.Ī Pressure Sustaining Valve (PSV) is used to maintain a set pressure at a specific point in the pipe network. If the downstream grade rises above the set value, the PRV will close.
PRVs throttle to prevent the downstream hydraulic grade from exceeding a set value.
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