Definitive Guide

Definitive Guide

Martin g lowe

PICV Manual

Martin Lowe

Bim Models

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Technical Submittals

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Definitive Guide to PICV Valves The reason for producing this guide is to explain to designers, installers and commissioning specialists the functions of the valves and their behaviour when installed in real systems. The aim is to ensure that valves are properly selected, and that systems are designed and commissioned so as to achieve the best possible performance from the valves.
PICVs offer the potential of improved control of thermal comfort and significant energy savings. However, the operating behaviour of the valves must be taken into account. This will require a different approach than for systems based on more traditional 2, 3 or 4 port control valve solutions.
Chris Parsole has previously been associated with the writing of BSRIA and CIBSE publications on related subjects including:
CIBSE Code W: Water distribution systems
CIBSE KS 7 Variable flow pipework systems
BSRIA BG2/2010: Commissioning Water Systems.
This guide draws on the design and commissioning guidance provided in these existing guides and expands on those issues particularly relevant to PICVs.
Three valves in one Body
Differentail pressure Control Valve Diaphragm, Spring Pressure, Ports
Control Valve, Equal Percentage to suit Coil Performance
Balancing Valve Constant Pressure Fixed KV = Flow limiting
System Design suggestion
Location of PICV valve
Location and type of Flow Measurement
End of Line Duty
Branch valve arrangements
End of Line
Future Loop
PICV Valve Dynamic Plot
Two Curves, Rising Pressure, Falling Pressure
Hysteresis the difference between the two curves
Start up Pressure, Maximum working pressure
Three function in One valve
PICV Valve Dynamic Plot
Two Curves, Rising Pressure, Falling Pressure
Hysteresis the difference between the two curves
Start up Pressure, Maximum working pressure
Power Output Curve

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