© Belimo University 2012, All Rights Reserved Pressure Independent Control Valves PICCV ePIV Energy...

© Belimo University 2012, All Rights Reserved

Pressure Independent Control Valves

PICCV

ePIV

Energy ValveBelimo’s Family of PI Control Valves

Flow Verification/Commissioning

A PI Control Valve….

Is a 2-way control valve that supplies a precise flow at any given control signal…

Regardless of pressure variations in a system.

It is not just a control valve and flow limiting circuit setter in the same assembly!

Note: Automatic or manual balance valves should NOT be used with PI valves. If they are already installed they should be set WIDE OPEN.

What is a pressure independent control valve?

Pressure Independent Control Valve

Additional P/T PORT for verification of 5 psi (11.5 ft H20) minimum differential across the PI Valve.

Pressure Independent Control Valve

Minimum ΔP across valve must be verified with PI valve COMMANDED by DDC (or by programming tool) to design

flow, not manually positioned!

Field Installed P/T port requirements

System Level Flow VerificationStep 1: Ensure all strainers are clean and bypass valves are closed.

Step 2: Command via DDC all PI valves to design flow. (Diversity assumed at 100%.)

Step 3: Set distribution pump(s) to elevated speed by commanding ΔP setpoint or pump speed directly.

Step 4: Find the “critical zone” (ie. the PI valve that has the least ΔP).

Step 5: Increase or decrease pump speed/ΔP setpoint until critical zone has just over 5 psid (11.5 ft H20). The resulting ΔP at the system sensor will be the optimum system ΔP setpoint.

Step 6: Verify total system flow is at design at main flow station (or by other method).

Step 7: If flow is not within +/- 10% of design, start checking valves at terminal level, starting with largest valve(s) first (voltage, control signal, strainer, etc.)

Terminal Level Flow Verification

• Belimo PI valves do NOT require that the entire system be placed in full design flow. Each PI valve flow can be verified individually with the rest of the system under normal control.

1) Command valve assembly to design.2) Verify 5 psid across PI valve assembly.3) Verify coil flow as per usual method (coil ΔP

method, etc.)

Link for PI valve commissioning document:

www.piccv.com/pdf/PICCV_Application_Bulletin.pdf

Field adjustable programming tool allows basic setup to be changed/modified based on initial or changing needs of project without hardware modification or change out.

Example: Change Orders or Tenant Build outs.

Belimo Field Programming Tool

No external power needed; no battery; powered by actuator 24 vac. Just plug it into actuator.

Belimo PC Tool Software

Field Programming Software allows changes/modifications

to setup in addition to trending and diagnostic

capabilities.

Commissioning DocumentationAvailable upon request.

Questions?