• SIRON Fire Protection Valves

PRV Pressure Regulating Valve

The Model PRV Pressure Regulating valve is an FM Approved diaphragm-type valve available in 1-1/2” (40mm), 2” (50mm), 2-1/2” (65mm), 76mm, 3” (80mm), 4” (100mm), 6” (150mm), and 165mm nominal sizes with multiple end configurations.

The valve diaphragm seals against a seat machined in the valve body. Water pressure in the chamber between the diaphragm and the cover presses the diaphragm against the seat to prevent water flow through the valve. The release of water pressure from the chamber allows the diaphragm to deform away from the seat allowing water to flow through the valve. A pressure regulator included in the trim allows the Model PRV valve to regulate the water pressure downstream of the valve.

siron fire protection prv pressure regulating valve

PRV Pressure Regulating Valve

Specification 820

Available Size
- 1-1/2” (40mm)
- 2” (50mm)
- 2-1/2” (65mm)
- 76mm, 3” (80mm)
- 4” (100mm)
- 6” (150mm), 165mm


- 400 psi (27.6 bar) rated pressure
- Compact trim
- No trim connections to valve cover
- Pressure relief valve included with trim



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