Differential Pressure Control Valves General Application stephen.hart@frese.co.uk Types of Differential Pressure Control Valve Pilot Operated DPCV www.frese.eu Direct Acting DPCV 2 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS Typical Direct Acting Differential Pressure Control Valve Flanged Angle Pattern Threaded Oblique Pattern 1) 2) 3) 4) 5) 6) 7) www.frese.eu Adjustment Nut Spring Cover Test Plugs Housing Piston Capillary Tube Connection Adjustment Spring 3 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Pressure Diagram www.frese.eu 4 4 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Application Static Balancing Solution www.frese.eu 5 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Application Dynamic Balancing Solution www.frese.eu 6 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Typical Partner Valve Arrangements Double Regulating Valve (FODRV) www.frese.eu Flow Limiting Valve (CFR) 7 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Commissioning 12 kPa www.frese.eu 14 kPa 8 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV P-Band 3 kPa PBand 14 kPa 12 kPa 11 kPa 0.014 l/s www.frese.eu 0.111 l/s 9 0.167 l/s KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Hysteresis 100 90 80 70 60 50 Pressure [kPa] 40 30 20 10 0 0 100 200 300 400 500 600 700 Flow [lph] www.frese.eu 10 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS DPCV Pump Sizing Calculation Pump pressure (ΔPP) = Differential pressure in system (ΔPS) + Pressure loss across valve (ΔPV ) • • • Desired differential pressure in system = 30 kPa Desired flow in system = 10 m3/h Selected DPCV Kvs = 29 m3/h (DN50) → Required pump pressure (ΔPP) = 30 + ((10/29)2 * 100) = 30 kPa + 11.9 kPa = 41.9 kPa www.frese.eu 11 KNOWLEDGE ● QUALITY ● INNOVATION ● MANUFACTURING EXCELLENCE ● CUSTOMER FOCUS Differential Pressure Control Valves General Application stephen.hart@frese.co.uk