This Guide on the principles of DPCVs (Differential Pressure Control Valves) and PICVs (Pressure Independent Control Valves) is the latest in the series from Crane Fluid Systems specifically for Building Services engineers.
Written in a ‘practical language’ that is easy to read, being relevant to practising engineers at all levels of knowledge and experience including fitters, commissioning technicians, contractors, consultants and system designers.
Describing in detail changes in system design which made it necessary to introduce DPCVs and PICVs into variable volume heating and chilled water systems.
Section 1 – Differential Pressure Control Valves
1.1 Differential Pressure Control Valves
1.2 System Design Incorporating DPCVs
1.3 Typical circuits using DPCVs
1.4 System Balancing using DPCVs
1.5 Trouble shooting DPCV circuits
Section 2 – Pressure Independent Control Valves
2.1 Design incorporating PICVs
2.2 Typical circuits with PICVs
2.3 System Balancing using PICVs
2.4 Trouble shooting PICV circuits
Appendices – Cavitation
1 Relationship between flow rate and differential pressure
2 Kirchhoff’s 2nd Law
3 Heat output from terminals
4 Preferred numbers
5 Characteristics of control valves
6 Equal percentage characteristics
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