535750Ha - Presscal Prv Asse 1003, 3/4" Pex Crimp - Caleffi

Genuine Caleffi PresCal™ pressure reducing valve (PRV) for plumbing and hydronic systems. The PresCal™ automatically reduces and stabilizes incoming water pressure to a safe, preset level — protecting downstream plumbing, fixtures, and hydronic components from high pressure that causes leaks, fixture damage, water hammer, and excessive water consumption. Available in Compact (diaphragm, residential) and HP (piston, heavy-duty commercial) configurations.

🔌 Connection Type

PEX — compatible with PEX or PEX-AL-PEX tubing using expansion or crimp fittings

⚠ Installation Note

Install a pressure gauge downstream of the PRV to verify outlet pressure during commissioning. Always flush the supply line before installation.

Q: What outlet pressure should I set the PRV to?

A: For residential plumbing systems, 50–60 psi is the typical recommended outlet pressure. Hydronic systems may have specific pressure requirements — consult the boiler or heat source manufacturer. Pressure above 80 psi can damage fixtures and appliances; below 30 psi can cause inadequate flow at upper-floor fixtures.

Q: What is the difference between the PresCal Compact and HP models?

A: The PresCal Compact uses a diaphragm mechanism suitable for standard residential flow rates and pressures. The PresCal HP uses a piston mechanism designed for higher flow rates, severe water hammer conditions, and commercial applications where higher pressure differentials and more robust construction are required.