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Frese PV

Differential pressure control valve

Heating and cooling systems are often noisy with thermostatic valves not being able to close completely.

Despite the fact that almost all modern systems use variable speed pumps, there is still a tendency in larger systems for differential pressure to increase when the system is partially loaded, giving rise to noise and to valves that struggle to regulate effectively.

Frese PV maintains a constant differential pressure in the system and is unaffected by fluctuations in pressure and flow. To allow for precise adjustment of differential pressure, all standard valves are equipped with P/T plugs, which means differential pressure can be measured across the system and across every valve.

Frese PV can be combined with Frese S, dynamic balancing valve and the combination of valves means that there is perfect control over differential pressure within the system and complete control over flow. Regardless of any other changes in the system, differential pressure and maximum flow will not change.

Benefits

• The valve offers three in-built functions: adjustabledifferential pressure control, isolation and P/T plugs for pressure verification
• Frese PV eliminates noise problems caused by over pressure
• Differential pressure can be set and adjusted on site
• Tamper-proof presetting device on top of the valve, meaning there is no need for the valve sealing after presetting
• Presetting is simple using the graphs shown on pages 9-13

Features

• Maximum differential pressure: 400 kPa
• Removable ΔP cartridge allows forward as well as backflushing
• Size range: DN15 to DN50
• Maximum flow: 15 m³/h
• Built-in P/T plugs for ΔP verification

Dynamic flow control - easy commissioning