(By permission from Recommended Practice for Design and Construction of Pressure-Relieving Systems in Refineries, API RP-520, 5th ed., American Petroleum Institute (1990) (also see [5a]).) Figure 9-6b ...
Hydraulic pressure regulators maintain a specific pressure range and are commonly known as unloading valves or unloading relief valves. In hydraulic power systems, these regulators both unload the ...