The ROMA Type R Pressure Reducing Valve is a pilot-operated, full-bore, single-seat valve engineered to handle significantly higher steam flow capacities compared to direct-acting valves of the same size.

The valve provides adjustable downstream pressure control, ranging from approximately 90% of the inlet pressure down to any pressure above 100 kPa. Once set, it accurately maintains the selected pressure regardless of variations in upstream pressure or steam demand.

For proper operation, a minimum pressure differential of 100 kPa between the inlet and outlet is required.

Operation

The reduced downstream pressure acts on a diaphragm, balancing the force applied by the adjustable regulating spring. When the downstream pressure decreases below the set value, the spring opens the pilot valve, allowing inlet pressure to act on the piston. This action opens the main valve, increasing steam flow to the downstream side and restoring the desired pressure.

The valve continuously adjusts its position in response to changing system demands, ensuring stable pressure regulation and efficient steam flow under all operating conditions.