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Art.6540 is a combined automatic balancing valve. It features three function in compact valve body: 1. Differential pressure controller 2. Control valve with linear characteristic 3. Flow limiter Benefits: • Reliable heating system resulting in: - proper heat distribution even at partial loads - noise free operation based on stable low Δp over thermostatic radiator valves even in installation where higher pump head is needed • Lower heating cost • Better indoor temperature control • Faster in simpler installation with less installation space needed