Originally published: 11/3/2022
The only direct-acting pressure regulating valve in North America with true piston operation, the PresCal™HP family ensures stable, high-precision water pressure control while withstanding severe inlet pressure or punishing downstream water hammer. It’s perfect for staged pressure control or demanding applications that are fraught with extreme pressure fluctuations. Being the bridge between a building’s water main and its distribution piping, a PRV experiences pressure fluctuations on both downstream and upstream sides. These fluctuations can be of sufficient magnitude to cause premature fatiguing and failure of a rubber diaphragm design, the industry standard (including Caleffi). The higher the incoming pressure, the more severe the fluctuations and their effects frequently are. This is because higher-pressure applications often involve commercial buildings containing quick-acting devices. They are also interconnected with other similar buildings. Controlling pressure reliably in such applications requires either a robustly designed PRV, a two-stage PRV arrangement, or both. These are the demanding conditions the Caleffi PresCal HP family of PRVs is designed for. Instead of using a flexible, rubber diaphragm separating the high-pressure and low-pressure chambers inside the PRV, the PresCal HP uses a durable piston design. The high-range model serves as a first-stage PRV in a two-stage application. The low-range model serves as a second stage, or as a stand-alone PRV for punishing pressure spikes.
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